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annotate src/audio/SDL_wave.c @ 3235:d35b649858e0

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David Carre to Sam Hello sam, me again. I'v fixed another bug in the pandora code, it's on the no-X videodriver, i forgot to add some code to destroy the window so it was impossible to reload SDL inside the same application (eglTerminate). You'll find the svn diff attached. See you, David.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 11 Aug 2009 13:45:01 +0000
parents 99210400e8b9
children 57823d017f02
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Microsoft WAVE file loading routines */
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25
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26 #include "SDL_audio.h"
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27 #include "SDL_wave.h"
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28
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29
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30 static int ReadChunk(SDL_RWops * src, Chunk * chunk);
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31
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32 struct MS_ADPCM_decodestate
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33 {
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34 Uint8 hPredictor;
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35 Uint16 iDelta;
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36 Sint16 iSamp1;
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37 Sint16 iSamp2;
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38 };
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39 static struct MS_ADPCM_decoder
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40 {
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41 WaveFMT wavefmt;
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42 Uint16 wSamplesPerBlock;
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43 Uint16 wNumCoef;
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44 Sint16 aCoeff[7][2];
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45 /* * * */
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46 struct MS_ADPCM_decodestate state[2];
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47 } MS_ADPCM_state;
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48
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49 static int
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50 InitMS_ADPCM(WaveFMT * format)
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51 {
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52 Uint8 *rogue_feel;
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53 Uint16 extra_info;
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54 int i;
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55
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56 /* Set the rogue pointer to the MS_ADPCM specific data */
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57 MS_ADPCM_state.wavefmt.encoding = SDL_SwapLE16(format->encoding);
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58 MS_ADPCM_state.wavefmt.channels = SDL_SwapLE16(format->channels);
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59 MS_ADPCM_state.wavefmt.frequency = SDL_SwapLE32(format->frequency);
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60 MS_ADPCM_state.wavefmt.byterate = SDL_SwapLE32(format->byterate);
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61 MS_ADPCM_state.wavefmt.blockalign = SDL_SwapLE16(format->blockalign);
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62 MS_ADPCM_state.wavefmt.bitspersample =
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63 SDL_SwapLE16(format->bitspersample);
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64 rogue_feel = (Uint8 *) format + sizeof(*format);
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65 if (sizeof(*format) == 16) {
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66 extra_info = ((rogue_feel[1] << 8) | rogue_feel[0]);
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67 rogue_feel += sizeof(Uint16);
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68 }
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69 MS_ADPCM_state.wSamplesPerBlock = ((rogue_feel[1] << 8) | rogue_feel[0]);
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70 rogue_feel += sizeof(Uint16);
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71 MS_ADPCM_state.wNumCoef = ((rogue_feel[1] << 8) | rogue_feel[0]);
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72 rogue_feel += sizeof(Uint16);
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73 if (MS_ADPCM_state.wNumCoef != 7) {
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74 SDL_SetError("Unknown set of MS_ADPCM coefficients");
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75 return (-1);
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76 }
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77 for (i = 0; i < MS_ADPCM_state.wNumCoef; ++i) {
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78 MS_ADPCM_state.aCoeff[i][0] = ((rogue_feel[1] << 8) | rogue_feel[0]);
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79 rogue_feel += sizeof(Uint16);
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80 MS_ADPCM_state.aCoeff[i][1] = ((rogue_feel[1] << 8) | rogue_feel[0]);
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81 rogue_feel += sizeof(Uint16);
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82 }
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83 return (0);
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84 }
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85
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86 static Sint32
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87 MS_ADPCM_nibble(struct MS_ADPCM_decodestate *state,
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88 Uint8 nybble, Sint16 * coeff)
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89 {
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90 const Sint32 max_audioval = ((1 << (16 - 1)) - 1);
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91 const Sint32 min_audioval = -(1 << (16 - 1));
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92 const Sint32 adaptive[] = {
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93 230, 230, 230, 230, 307, 409, 512, 614,
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94 768, 614, 512, 409, 307, 230, 230, 230
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95 };
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96 Sint32 new_sample, delta;
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97
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98 new_sample = ((state->iSamp1 * coeff[0]) +
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99 (state->iSamp2 * coeff[1])) / 256;
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100 if (nybble & 0x08) {
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101 new_sample += state->iDelta * (nybble - 0x10);
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102 } else {
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103 new_sample += state->iDelta * nybble;
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104 }
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105 if (new_sample < min_audioval) {
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106 new_sample = min_audioval;
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107 } else if (new_sample > max_audioval) {
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108 new_sample = max_audioval;
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109 }
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110 delta = ((Sint32) state->iDelta * adaptive[nybble]) / 256;
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111 if (delta < 16) {
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112 delta = 16;
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113 }
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114 state->iDelta = (Uint16) delta;
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115 state->iSamp2 = state->iSamp1;
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116 state->iSamp1 = (Sint16) new_sample;
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117 return (new_sample);
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118 }
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119
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120 static int
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121 MS_ADPCM_decode(Uint8 ** audio_buf, Uint32 * audio_len)
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122 {
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123 struct MS_ADPCM_decodestate *state[2];
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124 Uint8 *freeable, *encoded, *decoded;
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125 Sint32 encoded_len, samplesleft;
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126 Sint8 nybble, stereo;
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127 Sint16 *coeff[2];
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128 Sint32 new_sample;
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129
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130 /* Allocate the proper sized output buffer */
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131 encoded_len = *audio_len;
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132 encoded = *audio_buf;
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133 freeable = *audio_buf;
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134 *audio_len = (encoded_len / MS_ADPCM_state.wavefmt.blockalign) *
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135 MS_ADPCM_state.wSamplesPerBlock *
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136 MS_ADPCM_state.wavefmt.channels * sizeof(Sint16);
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137 *audio_buf = (Uint8 *) SDL_malloc(*audio_len);
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138 if (*audio_buf == NULL) {
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139 SDL_Error(SDL_ENOMEM);
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140 return (-1);
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141 }
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142 decoded = *audio_buf;
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143
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144 /* Get ready... Go! */
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145 stereo = (MS_ADPCM_state.wavefmt.channels == 2);
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146 state[0] = &MS_ADPCM_state.state[0];
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147 state[1] = &MS_ADPCM_state.state[stereo];
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148 while (encoded_len >= MS_ADPCM_state.wavefmt.blockalign) {
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149 /* Grab the initial information for this block */
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150 state[0]->hPredictor = *encoded++;
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151 if (stereo) {
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152 state[1]->hPredictor = *encoded++;
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153 }
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154 state[0]->iDelta = ((encoded[1] << 8) | encoded[0]);
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155 encoded += sizeof(Sint16);
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156 if (stereo) {
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157 state[1]->iDelta = ((encoded[1] << 8) | encoded[0]);
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158 encoded += sizeof(Sint16);
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159 }
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160 state[0]->iSamp1 = ((encoded[1] << 8) | encoded[0]);
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161 encoded += sizeof(Sint16);
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162 if (stereo) {
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163 state[1]->iSamp1 = ((encoded[1] << 8) | encoded[0]);
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164 encoded += sizeof(Sint16);
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165 }
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166 state[0]->iSamp2 = ((encoded[1] << 8) | encoded[0]);
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167 encoded += sizeof(Sint16);
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168 if (stereo) {
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169 state[1]->iSamp2 = ((encoded[1] << 8) | encoded[0]);
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170 encoded += sizeof(Sint16);
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171 }
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172 coeff[0] = MS_ADPCM_state.aCoeff[state[0]->hPredictor];
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173 coeff[1] = MS_ADPCM_state.aCoeff[state[1]->hPredictor];
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174
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175 /* Store the two initial samples we start with */
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176 decoded[0] = state[0]->iSamp2 & 0xFF;
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177 decoded[1] = state[0]->iSamp2 >> 8;
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178 decoded += 2;
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179 if (stereo) {
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180 decoded[0] = state[1]->iSamp2 & 0xFF;
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181 decoded[1] = state[1]->iSamp2 >> 8;
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182 decoded += 2;
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183 }
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184 decoded[0] = state[0]->iSamp1 & 0xFF;
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185 decoded[1] = state[0]->iSamp1 >> 8;
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186 decoded += 2;
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187 if (stereo) {
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188 decoded[0] = state[1]->iSamp1 & 0xFF;
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189 decoded[1] = state[1]->iSamp1 >> 8;
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190 decoded += 2;
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191 }
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192
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193 /* Decode and store the other samples in this block */
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194 samplesleft = (MS_ADPCM_state.wSamplesPerBlock - 2) *
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195 MS_ADPCM_state.wavefmt.channels;
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196 while (samplesleft > 0) {
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197 nybble = (*encoded) >> 4;
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198 new_sample = MS_ADPCM_nibble(state[0], nybble, coeff[0]);
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199 decoded[0] = new_sample & 0xFF;
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200 new_sample >>= 8;
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201 decoded[1] = new_sample & 0xFF;
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202 decoded += 2;
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203
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204 nybble = (*encoded) & 0x0F;
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205 new_sample = MS_ADPCM_nibble(state[1], nybble, coeff[1]);
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206 decoded[0] = new_sample & 0xFF;
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207 new_sample >>= 8;
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208 decoded[1] = new_sample & 0xFF;
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209 decoded += 2;
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210
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211 ++encoded;
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212 samplesleft -= 2;
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213 }
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214 encoded_len -= MS_ADPCM_state.wavefmt.blockalign;
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215 }
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216 SDL_free(freeable);
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217 return (0);
0
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218 }
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diff changeset
219
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220 struct IMA_ADPCM_decodestate
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221 {
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222 Sint32 sample;
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223 Sint8 index;
0
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224 };
1895
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225 static struct IMA_ADPCM_decoder
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226 {
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227 WaveFMT wavefmt;
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228 Uint16 wSamplesPerBlock;
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229 /* * * */
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230 struct IMA_ADPCM_decodestate state[2];
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231 } IMA_ADPCM_state;
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232
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233 static int
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234 InitIMA_ADPCM(WaveFMT * format)
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235 {
1895
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236 Uint8 *rogue_feel;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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237 Uint16 extra_info;
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238
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239 /* Set the rogue pointer to the IMA_ADPCM specific data */
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240 IMA_ADPCM_state.wavefmt.encoding = SDL_SwapLE16(format->encoding);
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241 IMA_ADPCM_state.wavefmt.channels = SDL_SwapLE16(format->channels);
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diff changeset
242 IMA_ADPCM_state.wavefmt.frequency = SDL_SwapLE32(format->frequency);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
243 IMA_ADPCM_state.wavefmt.byterate = SDL_SwapLE32(format->byterate);
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diff changeset
244 IMA_ADPCM_state.wavefmt.blockalign = SDL_SwapLE16(format->blockalign);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
245 IMA_ADPCM_state.wavefmt.bitspersample =
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diff changeset
246 SDL_SwapLE16(format->bitspersample);
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diff changeset
247 rogue_feel = (Uint8 *) format + sizeof(*format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
248 if (sizeof(*format) == 16) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
249 extra_info = ((rogue_feel[1] << 8) | rogue_feel[0]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1818
diff changeset
250 rogue_feel += sizeof(Uint16);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1818
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251 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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252 IMA_ADPCM_state.wSamplesPerBlock = ((rogue_feel[1] << 8) | rogue_feel[0]);
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253 return (0);
0
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parents:
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254 }
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255
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diff changeset
256 static Sint32
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
257 IMA_ADPCM_nibble(struct IMA_ADPCM_decodestate *state, Uint8 nybble)
0
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258 {
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259 const Sint32 max_audioval = ((1 << (16 - 1)) - 1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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260 const Sint32 min_audioval = -(1 << (16 - 1));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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261 const int index_table[16] = {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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262 -1, -1, -1, -1,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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263 2, 4, 6, 8,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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264 -1, -1, -1, -1,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
265 2, 4, 6, 8
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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266 };
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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267 const Sint32 step_table[89] = {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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268 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 21, 23, 25, 28, 31,
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269 34, 37, 41, 45, 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130,
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270 143, 157, 173, 190, 209, 230, 253, 279, 307, 337, 371, 408,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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271 449, 494, 544, 598, 658, 724, 796, 876, 963, 1060, 1166, 1282,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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272 1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
273 3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
274 9493, 10442, 11487, 12635, 13899, 15289, 16818, 18500, 20350,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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275 22385, 24623, 27086, 29794, 32767
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276 };
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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277 Sint32 delta, step;
0
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278
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279 /* Compute difference and new sample value */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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280 step = step_table[state->index];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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281 delta = step >> 3;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
282 if (nybble & 0x04)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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283 delta += step;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
284 if (nybble & 0x02)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
285 delta += (step >> 1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1818
diff changeset
286 if (nybble & 0x01)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1818
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287 delta += (step >> 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1818
diff changeset
288 if (nybble & 0x08)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
289 delta = -delta;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
290 state->sample += delta;
0
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291
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
292 /* Update index value */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
293 state->index += index_table[nybble];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
294 if (state->index > 88) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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295 state->index = 88;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1818
diff changeset
296 } else if (state->index < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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297 state->index = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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298 }
0
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299
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diff changeset
300 /* Clamp output sample */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
301 if (state->sample > max_audioval) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
302 state->sample = max_audioval;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1818
diff changeset
303 } else if (state->sample < min_audioval) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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304 state->sample = min_audioval;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
305 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
306 return (state->sample);
0
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diff changeset
307 }
74212992fb08 Initial revision
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parents:
diff changeset
308
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diff changeset
309 /* Fill the decode buffer with a channel block of data (8 samples) */
1895
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diff changeset
310 static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
311 Fill_IMA_ADPCM_block(Uint8 * decoded, Uint8 * encoded,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
312 int channel, int numchannels,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
313 struct IMA_ADPCM_decodestate *state)
0
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diff changeset
314 {
1895
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diff changeset
315 int i;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
316 Sint8 nybble;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
317 Sint32 new_sample;
0
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diff changeset
318
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
319 decoded += (channel * 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1818
diff changeset
320 for (i = 0; i < 4; ++i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
321 nybble = (*encoded) & 0x0F;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
322 new_sample = IMA_ADPCM_nibble(state, nybble);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
323 decoded[0] = new_sample & 0xFF;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
324 new_sample >>= 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
325 decoded[1] = new_sample & 0xFF;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
326 decoded += 2 * numchannels;
0
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diff changeset
327
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
328 nybble = (*encoded) >> 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1818
diff changeset
329 new_sample = IMA_ADPCM_nibble(state, nybble);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
330 decoded[0] = new_sample & 0xFF;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
331 new_sample >>= 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
332 decoded[1] = new_sample & 0xFF;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
333 decoded += 2 * numchannels;
0
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parents:
diff changeset
334
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
335 ++encoded;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
336 }
0
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diff changeset
337 }
74212992fb08 Initial revision
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parents:
diff changeset
338
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
339 static int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
340 IMA_ADPCM_decode(Uint8 ** audio_buf, Uint32 * audio_len)
0
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parents:
diff changeset
341 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
342 struct IMA_ADPCM_decodestate *state;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
343 Uint8 *freeable, *encoded, *decoded;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
344 Sint32 encoded_len, samplesleft;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
345 unsigned int c, channels;
0
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diff changeset
346
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
347 /* Check to make sure we have enough variables in the state array */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
348 channels = IMA_ADPCM_state.wavefmt.channels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
349 if (channels > SDL_arraysize(IMA_ADPCM_state.state)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
350 SDL_SetError("IMA ADPCM decoder can only handle %d channels",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
351 SDL_arraysize(IMA_ADPCM_state.state));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
352 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
353 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
354 state = IMA_ADPCM_state.state;
0
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diff changeset
355
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
356 /* Allocate the proper sized output buffer */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
357 encoded_len = *audio_len;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
358 encoded = *audio_buf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
359 freeable = *audio_buf;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
360 *audio_len = (encoded_len / IMA_ADPCM_state.wavefmt.blockalign) *
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
361 IMA_ADPCM_state.wSamplesPerBlock *
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
362 IMA_ADPCM_state.wavefmt.channels * sizeof(Sint16);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
363 *audio_buf = (Uint8 *) SDL_malloc(*audio_len);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
364 if (*audio_buf == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
365 SDL_Error(SDL_ENOMEM);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
366 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
367 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
368 decoded = *audio_buf;
0
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parents:
diff changeset
369
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
370 /* Get ready... Go! */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
371 while (encoded_len >= IMA_ADPCM_state.wavefmt.blockalign) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
372 /* Grab the initial information for this block */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
373 for (c = 0; c < channels; ++c) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
374 /* Fill the state information for this block */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
375 state[c].sample = ((encoded[1] << 8) | encoded[0]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
376 encoded += 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
377 if (state[c].sample & 0x8000) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
378 state[c].sample -= 0x10000;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
379 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
380 state[c].index = *encoded++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
381 /* Reserved byte in buffer header, should be 0 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
382 if (*encoded++ != 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
383 /* Uh oh, corrupt data? Buggy code? */ ;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
384 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
385
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
386 /* Store the initial sample we start with */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
387 decoded[0] = (Uint8) (state[c].sample & 0xFF);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
388 decoded[1] = (Uint8) (state[c].sample >> 8);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
389 decoded += 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
390 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
391
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
392 /* Decode and store the other samples in this block */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
393 samplesleft = (IMA_ADPCM_state.wSamplesPerBlock - 1) * channels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
394 while (samplesleft > 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
395 for (c = 0; c < channels; ++c) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
396 Fill_IMA_ADPCM_block(decoded, encoded,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
397 c, channels, &state[c]);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
398 encoded += 4;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
399 samplesleft -= 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
400 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
401 decoded += (channels * 8 * 2);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
402 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
403 encoded_len -= IMA_ADPCM_state.wavefmt.blockalign;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
404 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
405 SDL_free(freeable);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
406 return (0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
407 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
408
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
409 SDL_AudioSpec *
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
410 SDL_LoadWAV_RW(SDL_RWops * src, int freesrc,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
411 SDL_AudioSpec * spec, Uint8 ** audio_buf, Uint32 * audio_len)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
413 int was_error;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
414 Chunk chunk;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
415 int lenread;
1994
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
416 int IEEE_float_encoded, MS_ADPCM_encoded, IMA_ADPCM_encoded;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
417 int samplesize;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
419 /* WAV magic header */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
420 Uint32 RIFFchunk;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
421 Uint32 wavelen = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
422 Uint32 WAVEmagic;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
423 Uint32 headerDiff = 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
425 /* FMT chunk */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
426 WaveFMT *format = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
427
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
428 /* Make sure we are passed a valid data source */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
429 was_error = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
430 if (src == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
431 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
432 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
433 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
435 /* Check the magic header */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
436 RIFFchunk = SDL_ReadLE32(src);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
437 wavelen = SDL_ReadLE32(src);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
438 if (wavelen == WAVE) { /* The RIFFchunk has already been read */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
439 WAVEmagic = wavelen;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
440 wavelen = RIFFchunk;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
441 RIFFchunk = RIFF;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
442 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
443 WAVEmagic = SDL_ReadLE32(src);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
444 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
445 if ((RIFFchunk != RIFF) || (WAVEmagic != WAVE)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
446 SDL_SetError("Unrecognized file type (not WAVE)");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
447 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
448 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
449 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
450 headerDiff += sizeof(Uint32); /* for WAVE */
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
452 /* Read the audio data format chunk */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
453 chunk.data = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
454 do {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
455 if (chunk.data != NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
456 SDL_free(chunk.data);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
457 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
458 lenread = ReadChunk(src, &chunk);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
459 if (lenread < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
460 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
461 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
462 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
463 /* 2 Uint32's for chunk header+len, plus the lenread */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
464 headerDiff += lenread + 2 * sizeof(Uint32);
2735
204be4fc2726 Final merge of Google Summer of Code 2008 work...
Sam Lantinga <slouken@libsdl.org>
parents: 2012
diff changeset
465 } while ((chunk.magic == FACT) || (chunk.magic == LIST));
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
467 /* Decode the audio data format */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
468 format = (WaveFMT *) chunk.data;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
469 if (chunk.magic != FMT) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
470 SDL_SetError("Complex WAVE files not supported");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
471 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
472 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
473 }
1994
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
474 IEEE_float_encoded = MS_ADPCM_encoded = IMA_ADPCM_encoded = 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
475 switch (SDL_SwapLE16(format->encoding)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
476 case PCM_CODE:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
477 /* We can understand this */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
478 break;
1994
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
479 case IEEE_FLOAT_CODE:
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
480 IEEE_float_encoded = 1;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
481 /* We can understand this */
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
482 break;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
483 case MS_ADPCM_CODE:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
484 /* Try to understand this */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
485 if (InitMS_ADPCM(format) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
486 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
487 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
488 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
489 MS_ADPCM_encoded = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
490 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
491 case IMA_ADPCM_CODE:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
492 /* Try to understand this */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
493 if (InitIMA_ADPCM(format) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
494 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
495 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
496 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
497 IMA_ADPCM_encoded = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
498 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
499 case MP3_CODE:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
500 SDL_SetError("MPEG Layer 3 data not supported",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
501 SDL_SwapLE16(format->encoding));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
502 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
503 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
504 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
505 SDL_SetError("Unknown WAVE data format: 0x%.4x",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
506 SDL_SwapLE16(format->encoding));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
507 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
508 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
509 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
510 SDL_memset(spec, 0, (sizeof *spec));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
511 spec->freq = SDL_SwapLE32(format->frequency);
1994
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
512
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
513 if (IEEE_float_encoded) {
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
514 if ((SDL_SwapLE16(format->bitspersample)) != 32) {
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
515 was_error = 1;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
516 } else {
1994
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
517 spec->format = AUDIO_F32;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
518 }
1994
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
519 } else {
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
520 switch (SDL_SwapLE16(format->bitspersample)) {
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
521 case 4:
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
522 if (MS_ADPCM_encoded || IMA_ADPCM_encoded) {
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
523 spec->format = AUDIO_S16;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
524 } else {
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
525 was_error = 1;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
526 }
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
527 break;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
528 case 8:
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
529 spec->format = AUDIO_U8;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
530 break;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
531 case 16:
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
532 spec->format = AUDIO_S16;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
533 break;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
534 case 32:
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
535 spec->format = AUDIO_S32;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
536 break;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
537 default:
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
538 was_error = 1;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
539 break;
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
540 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
541 }
1994
6abc7e6f9817 Added int32 adn float32 support to SDL_LoadWAV_RW().
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
542
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
543 if (was_error) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
544 SDL_SetError("Unknown %d-bit PCM data format",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
545 SDL_SwapLE16(format->bitspersample));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
546 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
547 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
548 spec->channels = (Uint8) SDL_SwapLE16(format->channels);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
549 spec->samples = 4096; /* Good default buffer size */
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
550
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
551 /* Read the audio data chunk */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
552 *audio_buf = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
553 do {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
554 if (*audio_buf != NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
555 SDL_free(*audio_buf);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
556 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
557 lenread = ReadChunk(src, &chunk);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
558 if (lenread < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
559 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
560 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
561 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
562 *audio_len = lenread;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
563 *audio_buf = chunk.data;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
564 if (chunk.magic != DATA)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
565 headerDiff += lenread + 2 * sizeof(Uint32);
2735
204be4fc2726 Final merge of Google Summer of Code 2008 work...
Sam Lantinga <slouken@libsdl.org>
parents: 2012
diff changeset
566 } while (chunk.magic != DATA);
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
567 headerDiff += 2 * sizeof(Uint32); /* for the data chunk and len */
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
568
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
569 if (MS_ADPCM_encoded) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
570 if (MS_ADPCM_decode(audio_buf, audio_len) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
571 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
572 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
573 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
574 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
575 if (IMA_ADPCM_encoded) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
576 if (IMA_ADPCM_decode(audio_buf, audio_len) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
577 was_error = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
578 goto done;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
579 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
580 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
581
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
582 /* Don't return a buffer that isn't a multiple of samplesize */
2012
575d5c9d4db8 Continuing my quest to replace all the bitwise operations on SDL_AudioFormats
Ryan C. Gordon <icculus@icculus.org>
parents: 1994
diff changeset
583 samplesize = ((SDL_AUDIO_BITSIZE(spec->format)) / 8) * spec->channels;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
584 *audio_len &= ~(samplesize - 1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
585
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
586 done:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
587 if (format != NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
588 SDL_free(format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
589 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
590 if (src) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
591 if (freesrc) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
592 SDL_RWclose(src);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
593 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
594 /* seek to the end of the file (given by the RIFF chunk) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
595 SDL_RWseek(src, wavelen - chunk.length - headerDiff, RW_SEEK_CUR);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
596 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
597 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
598 if (was_error) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
599 spec = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
600 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
601 return (spec);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
602 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
603
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
604 /* Since the WAV memory is allocated in the shared library, it must also
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
605 be freed here. (Necessary under Win32, VC++)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
606 */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
607 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
608 SDL_FreeWAV(Uint8 * audio_buf)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
609 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
610 if (audio_buf != NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
611 SDL_free(audio_buf);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
612 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
613 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
614
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
615 static int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
616 ReadChunk(SDL_RWops * src, Chunk * chunk)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
617 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
618 chunk->magic = SDL_ReadLE32(src);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
619 chunk->length = SDL_ReadLE32(src);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
620 chunk->data = (Uint8 *) SDL_malloc(chunk->length);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
621 if (chunk->data == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
622 SDL_Error(SDL_ENOMEM);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
623 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
624 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
625 if (SDL_RWread(src, chunk->data, chunk->length, 1) != 1) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
626 SDL_Error(SDL_EFREAD);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
627 SDL_free(chunk->data);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
628 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
629 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
630 return (chunk->length);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
631 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
632
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1818
diff changeset
633 /* vi: set ts=4 sw=4 expandtab: */