Mercurial > SDL_sound_CoreAudio
view decoders/wav.c @ 304:0cf2b2e4a259
Updated.
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Sun, 21 Apr 2002 17:47:52 +0000 |
parents | 170b1400e060 |
children | c97be6e1bd27 |
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/* * SDL_sound -- An abstract sound format decoding API. * Copyright (C) 2001 Ryan C. Gordon. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* * WAV decoder for SDL_sound. * * This driver handles Microsoft .WAVs, in as many of the thousands of * variations as we can. * * Please see the file COPYING in the source's root directory. * * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) */ #if HAVE_CONFIG_H # include <config.h> #endif #ifdef SOUND_SUPPORTS_WAV #include <stdio.h> #include <stdlib.h> #include <string.h> #include <assert.h> #include "SDL_sound.h" #define __SDL_SOUND_INTERNAL__ #include "SDL_sound_internal.h" static int WAV_init(void); static void WAV_quit(void); static int WAV_open(Sound_Sample *sample, const char *ext); static void WAV_close(Sound_Sample *sample); static Uint32 WAV_read(Sound_Sample *sample); static int WAV_rewind(Sound_Sample *sample); static const char *extensions_wav[] = { "WAV", NULL }; const Sound_DecoderFunctions __Sound_DecoderFunctions_WAV = { { extensions_wav, "Microsoft WAVE audio format", "Ryan C. Gordon <icculus@clutteredmind.org>", "http://www.icculus.org/SDL_sound/" }, WAV_init, /* init() method */ WAV_quit, /* quit() method */ WAV_open, /* open() method */ WAV_close, /* close() method */ WAV_read, /* read() method */ WAV_rewind /* rewind() method */ }; /* Better than SDL_ReadLE16, since you can detect i/o errors... */ static inline int read_le16(SDL_RWops *rw, Uint16 *ui16) { int rc = SDL_RWread(rw, ui16, sizeof (Uint16), 1); BAIL_IF_MACRO(rc != 1, ERR_IO_ERROR, 0); *ui16 = SDL_SwapLE16(*ui16); return(1); } /* read_le16 */ /* Better than SDL_ReadLE32, since you can detect i/o errors... */ static inline int read_le32(SDL_RWops *rw, Uint32 *ui32) { int rc = SDL_RWread(rw, ui32, sizeof (Uint32), 1); BAIL_IF_MACRO(rc != 1, ERR_IO_ERROR, 0); *ui32 = SDL_SwapLE32(*ui32); return(1); } /* read_le32 */ /* This is just cleaner on the caller's end... */ static inline int read_uint8(SDL_RWops *rw, Uint8 *ui8) { int rc = SDL_RWread(rw, ui8, sizeof (Uint8), 1); BAIL_IF_MACRO(rc != 1, ERR_IO_ERROR, 0); return(1); } /* read_uint8 */ /* Chunk management code... */ #define riffID 0x46464952 /* "RIFF", in ascii. */ #define waveID 0x45564157 /* "WAVE", in ascii. */ #define factID 0x74636166 /* "fact", in ascii. */ /***************************************************************************** * The FORMAT chunk... * *****************************************************************************/ #define fmtID 0x20746D66 /* "fmt ", in ascii. */ #define FMT_NORMAL 0x0001 /* Uncompressed waveform data. */ #define FMT_ADPCM 0x0002 /* ADPCM compressed waveform data. */ typedef struct { Sint16 iCoef1; Sint16 iCoef2; } ADPCMCOEFSET; typedef struct { Uint8 bPredictor; Uint16 iDelta; Sint16 iSamp1; Sint16 iSamp2; } ADPCMBLOCKHEADER; typedef struct S_WAV_FMT_T { Uint32 chunkID; Sint32 chunkSize; Sint16 wFormatTag; Uint16 wChannels; Uint32 dwSamplesPerSec; Uint32 dwAvgBytesPerSec; Uint16 wBlockAlign; Uint16 wBitsPerSample; Uint32 sample_frame_size; Uint32 data_starting_offset; Uint32 total_bytes; void (*free)(struct S_WAV_FMT_T *fmt); Uint32 (*read_sample)(Sound_Sample *sample); int (*rewind_sample)(Sound_Sample *sample); union { struct { Uint16 cbSize; Uint16 wSamplesPerBlock; Uint16 wNumCoef; ADPCMCOEFSET *aCoef; ADPCMBLOCKHEADER *blockheaders; Uint32 samples_left_in_block; int nibble_state; Sint8 nibble; } adpcm; /* put other format-specific data here... */ } fmt; } fmt_t; /* * Read in a fmt_t from disk. This makes this process safe regardless of * the processor's byte order or how the fmt_t structure is packed. * Note that the union "fmt" is not read in here; that is handled as * needed in the read_fmt_* functions. */ static int read_fmt_chunk(SDL_RWops *rw, fmt_t *fmt) { /* skip reading the chunk ID, since it was already read at this point... */ fmt->chunkID = fmtID; BAIL_IF_MACRO(!read_le32(rw, &fmt->chunkSize), NULL, 0); BAIL_IF_MACRO(!read_le16(rw, &fmt->wFormatTag), NULL, 0); BAIL_IF_MACRO(!read_le16(rw, &fmt->wChannels), NULL, 0); BAIL_IF_MACRO(!read_le32(rw, &fmt->dwSamplesPerSec), NULL, 0); BAIL_IF_MACRO(!read_le32(rw, &fmt->dwAvgBytesPerSec), NULL, 0); BAIL_IF_MACRO(!read_le16(rw, &fmt->wBlockAlign), NULL, 0); BAIL_IF_MACRO(!read_le16(rw, &fmt->wBitsPerSample), NULL, 0); return(1); } /* read_fmt_chunk */ /***************************************************************************** * The DATA chunk... * *****************************************************************************/ #define dataID 0x61746164 /* "data", in ascii. */ typedef struct { Uint32 chunkID; Sint32 chunkSize; /* Then, (chunkSize) bytes of waveform data... */ } data_t; /* * Read in a data_t from disk. This makes this process safe regardless of * the processor's byte order or how the fmt_t structure is packed. */ static int read_data_chunk(SDL_RWops *rw, data_t *data) { /* skip reading the chunk ID, since it was already read at this point... */ data->chunkID = dataID; BAIL_IF_MACRO(!read_le32(rw, &data->chunkSize), NULL, 0); return(1); } /* read_data_chunk */ /***************************************************************************** * this is what we store in our internal->decoder_private field... * *****************************************************************************/ typedef struct { fmt_t *fmt; Sint32 bytesLeft; } wav_t; /***************************************************************************** * Normal, uncompressed waveform handler... * *****************************************************************************/ /* * Sound_Decode() lands here for uncompressed WAVs... */ static Uint32 read_sample_fmt_normal(Sound_Sample *sample) { Uint32 retval; Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; wav_t *w = (wav_t *) internal->decoder_private; Uint32 max = (internal->buffer_size < (Uint32) w->bytesLeft) ? internal->buffer_size : (Uint32) w->bytesLeft; assert(max > 0); /* * We don't actually do any decoding, so we read the wav data * directly into the internal buffer... */ retval = SDL_RWread(internal->rw, internal->buffer, 1, max); w->bytesLeft -= retval; /* Make sure the read went smoothly... */ if ((retval == 0) || (w->bytesLeft == 0)) sample->flags |= SOUND_SAMPLEFLAG_EOF; else if (retval == -1) sample->flags |= SOUND_SAMPLEFLAG_ERROR; /* (next call this EAGAIN may turn into an EOF or error.) */ else if (retval < internal->buffer_size) sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; return(retval); } /* read_sample_fmt_normal */ static int rewind_sample_fmt_normal(Sound_Sample *sample) { /* no-op. */ return(1); } /* rewind_sample_fmt_normal */ static int read_fmt_normal(SDL_RWops *rw, fmt_t *fmt) { /* (don't need to read more from the RWops...) */ fmt->free = NULL; fmt->read_sample = read_sample_fmt_normal; fmt->rewind_sample = rewind_sample_fmt_normal; return(1); } /* read_fmt_normal */ /***************************************************************************** * ADPCM compression handler... * *****************************************************************************/ #define FIXED_POINT_COEF_BASE 256 #define FIXED_POINT_ADAPTION_BASE 256 #define SMALLEST_ADPCM_DELTA 16 static inline int read_adpcm_block_headers(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; SDL_RWops *rw = internal->rw; wav_t *w = (wav_t *) internal->decoder_private; fmt_t *fmt = w->fmt; ADPCMBLOCKHEADER *headers = fmt->fmt.adpcm.blockheaders; int i; int max = fmt->wChannels; if (w->bytesLeft < fmt->wBlockAlign) { sample->flags |= SOUND_SAMPLEFLAG_EOF; return(0); } /* if */ w->bytesLeft -= fmt->wBlockAlign; for (i = 0; i < max; i++) BAIL_IF_MACRO(!read_uint8(rw, &headers[i].bPredictor), NULL, 0); for (i = 0; i < max; i++) BAIL_IF_MACRO(!read_le16(rw, &headers[i].iDelta), NULL, 0); for (i = 0; i < max; i++) BAIL_IF_MACRO(!read_le16(rw, &headers[i].iSamp1), NULL, 0); for (i = 0; i < max; i++) BAIL_IF_MACRO(!read_le16(rw, &headers[i].iSamp2), NULL, 0); fmt->fmt.adpcm.samples_left_in_block = fmt->fmt.adpcm.wSamplesPerBlock; fmt->fmt.adpcm.nibble_state = 0; return(1); } /* read_adpcm_block_headers */ static inline void do_adpcm_nibble(Uint8 nib, ADPCMBLOCKHEADER *header, Sint32 lPredSamp) { static const Sint32 max_audioval = ((1<<(16-1))-1); static const Sint32 min_audioval = -(1<<(16-1)); static const Sint32 AdaptionTable[] = { 230, 230, 230, 230, 307, 409, 512, 614, 768, 614, 512, 409, 307, 230, 230, 230 }; Sint32 lNewSamp; Sint32 delta; if (nib & 0x08) lNewSamp = lPredSamp + (header->iDelta * (nib - 0x10)); else lNewSamp = lPredSamp + (header->iDelta * nib); /* clamp value... */ if (lNewSamp < min_audioval) lNewSamp = min_audioval; else if (lNewSamp > max_audioval) lNewSamp = max_audioval; delta = ((Sint32) header->iDelta * AdaptionTable[nib]) / FIXED_POINT_ADAPTION_BASE; if (delta < SMALLEST_ADPCM_DELTA) delta = SMALLEST_ADPCM_DELTA; header->iDelta = delta; header->iSamp2 = header->iSamp1; header->iSamp1 = lNewSamp; } /* do_adpcm_nibble */ static inline int decode_adpcm_sample_frame(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; wav_t *w = (wav_t *) internal->decoder_private; fmt_t *fmt = w->fmt; ADPCMBLOCKHEADER *headers = fmt->fmt.adpcm.blockheaders; SDL_RWops *rw = internal->rw; int i; int max = fmt->wChannels; Sint32 delta; Uint8 nib = fmt->fmt.adpcm.nibble; for (i = 0; i < max; i++) { Uint8 byte; Sint16 iCoef1 = fmt->fmt.adpcm.aCoef[headers[i].bPredictor].iCoef1; Sint16 iCoef2 = fmt->fmt.adpcm.aCoef[headers[i].bPredictor].iCoef2; Sint32 lPredSamp = ((headers[i].iSamp1 * iCoef1) + (headers[i].iSamp2 * iCoef2)) / FIXED_POINT_COEF_BASE; if (fmt->fmt.adpcm.nibble_state == 0) { BAIL_IF_MACRO(!read_uint8(rw, &nib), NULL, 0); fmt->fmt.adpcm.nibble_state = 1; do_adpcm_nibble(nib >> 4, &headers[i], lPredSamp); } /* if */ else { fmt->fmt.adpcm.nibble_state = 0; do_adpcm_nibble(nib & 0x0F, &headers[i], lPredSamp); } /* else */ } /* for */ fmt->fmt.adpcm.nibble = nib; return(1); } /* decode_adpcm_sample_frame */ static inline void put_adpcm_sample_frame1(void *_buf, fmt_t *fmt) { Uint16 *buf = (Uint16 *) _buf; ADPCMBLOCKHEADER *headers = fmt->fmt.adpcm.blockheaders; int i; for (i = 0; i < fmt->wChannels; i++) *(buf++) = headers[i].iSamp1; } /* put_adpcm_sample_frame1 */ static inline void put_adpcm_sample_frame2(void *_buf, fmt_t *fmt) { Uint16 *buf = (Uint16 *) _buf; ADPCMBLOCKHEADER *headers = fmt->fmt.adpcm.blockheaders; int i; for (i = 0; i < fmt->wChannels; i++) *(buf++) = headers[i].iSamp2; } /* put_adpcm_sample_frame2 */ /* * Sound_Decode() lands here for ADPCM-encoded WAVs... */ static Uint32 read_sample_fmt_adpcm(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; wav_t *w = (wav_t *) internal->decoder_private; fmt_t *fmt = w->fmt; Uint32 bw = 0; while (bw < internal->buffer_size) { /* write ongoing sample frame before reading more data... */ switch (fmt->fmt.adpcm.samples_left_in_block) { case 0: /* need to read a new block... */ if (!read_adpcm_block_headers(sample)) { if ((sample->flags & SOUND_SAMPLEFLAG_EOF) == 0) sample->flags |= SOUND_SAMPLEFLAG_ERROR; return(bw); } /* if */ /* only write first sample frame for now. */ put_adpcm_sample_frame2((Uint8 *) internal->buffer + bw, fmt); fmt->fmt.adpcm.samples_left_in_block--; bw += fmt->sample_frame_size; break; case 1: /* output last sample frame of block... */ put_adpcm_sample_frame1((Uint8 *) internal->buffer + bw, fmt); fmt->fmt.adpcm.samples_left_in_block--; bw += fmt->sample_frame_size; break; default: /* output latest sample frame and read a new one... */ put_adpcm_sample_frame1((Uint8 *) internal->buffer + bw, fmt); fmt->fmt.adpcm.samples_left_in_block--; bw += fmt->sample_frame_size; if (!decode_adpcm_sample_frame(sample)) { sample->flags |= SOUND_SAMPLEFLAG_ERROR; return(bw); } /* if */ } /* switch */ } /* while */ return(bw); } /* read_sample_fmt_adpcm */ /* * Sound_FreeSample() lands here for ADPCM-encoded WAVs... */ static void free_fmt_adpcm(fmt_t *fmt) { if (fmt->fmt.adpcm.aCoef != NULL) free(fmt->fmt.adpcm.aCoef); if (fmt->fmt.adpcm.blockheaders != NULL) free(fmt->fmt.adpcm.blockheaders); } /* free_fmt_adpcm */ static int rewind_sample_fmt_adpcm(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; wav_t *w = (wav_t *) internal->decoder_private; w->fmt->fmt.adpcm.samples_left_in_block = 0; return(1); } /* rewind_sample_fmt_adpcm */ /* * Read in a the adpcm-specific info from disk. This makes this process * safe regardless of the processor's byte order or how the fmt_t * structure is packed. */ static int read_fmt_adpcm(SDL_RWops *rw, fmt_t *fmt) { size_t i; memset(&fmt->fmt.adpcm, '\0', sizeof (fmt->fmt.adpcm)); fmt->free = free_fmt_adpcm; fmt->read_sample = read_sample_fmt_adpcm; fmt->rewind_sample = rewind_sample_fmt_adpcm; BAIL_IF_MACRO(!read_le16(rw, &fmt->fmt.adpcm.cbSize), NULL, 0); BAIL_IF_MACRO(!read_le16(rw, &fmt->fmt.adpcm.wSamplesPerBlock), NULL, 0); BAIL_IF_MACRO(!read_le16(rw, &fmt->fmt.adpcm.wNumCoef), NULL, 0); /* fmt->free() is always called, so these malloc()s will be cleaned up. */ i = sizeof (ADPCMCOEFSET) * fmt->fmt.adpcm.wNumCoef; fmt->fmt.adpcm.aCoef = (ADPCMCOEFSET *) malloc(i); BAIL_IF_MACRO(fmt->fmt.adpcm.aCoef == NULL, ERR_OUT_OF_MEMORY, 0); for (i = 0; i < fmt->fmt.adpcm.wNumCoef; i++) { BAIL_IF_MACRO(!read_le16(rw, &fmt->fmt.adpcm.aCoef[i].iCoef1), NULL, 0); BAIL_IF_MACRO(!read_le16(rw, &fmt->fmt.adpcm.aCoef[i].iCoef2), NULL, 0); } /* for */ i = sizeof (ADPCMBLOCKHEADER) * fmt->wChannels; fmt->fmt.adpcm.blockheaders = (ADPCMBLOCKHEADER *) malloc(i); BAIL_IF_MACRO(fmt->fmt.adpcm.blockheaders == NULL, ERR_OUT_OF_MEMORY, 0); return(1); } /* read_fmt_adpcm */ /***************************************************************************** * Everything else... * *****************************************************************************/ static int WAV_init(void) { return(1); /* always succeeds. */ } /* WAV_init */ static void WAV_quit(void) { /* it's a no-op. */ } /* WAV_quit */ static int read_fmt(SDL_RWops *rw, fmt_t *fmt) { /* if it's in this switch statement, we support the format. */ switch (fmt->wFormatTag) { case FMT_NORMAL: SNDDBG(("WAV: Appears to be uncompressed audio.\n")); return(read_fmt_normal(rw, fmt)); case FMT_ADPCM: SNDDBG(("WAV: Appears to be ADPCM compressed audio.\n")); return(read_fmt_adpcm(rw, fmt)); /* add other types here. */ default: SNDDBG(("WAV: Format 0x%X is unknown.\n", (unsigned int) fmt->wFormatTag)); Sound_SetError("WAV: Unsupported format"); return(0); /* not supported whatsoever. */ } /* switch */ assert(0); /* shouldn't hit this point. */ return(0); } /* read_fmt */ /* * Locate a specific chunk in the WAVE file by ID... */ static int find_chunk(SDL_RWops *rw, Uint32 id) { Sint32 siz = 0; Uint32 _id = 0; Uint32 pos = SDL_RWtell(rw); while (1) { BAIL_IF_MACRO(!read_le32(rw, &_id), NULL, 0); if (_id == id) return(1); /* skip ahead and see what next chunk is... */ BAIL_IF_MACRO(!read_le32(rw, &siz), NULL, 0); assert(siz >= 0); pos += (sizeof (Uint32) * 2) + siz; if (siz > 0) BAIL_IF_MACRO(SDL_RWseek(rw, pos, SEEK_SET) != pos, NULL, 0); } /* while */ return(0); /* shouldn't hit this, but just in case... */ } /* find_chunk */ static int WAV_open_internal(Sound_Sample *sample, const char *ext, fmt_t *fmt) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; SDL_RWops *rw = internal->rw; data_t d; wav_t *w; Uint32 pos; BAIL_IF_MACRO(SDL_ReadLE32(rw) != riffID, "WAV: Not a RIFF file.", 0); SDL_ReadLE32(rw); /* throw the length away; we get this info later. */ BAIL_IF_MACRO(SDL_ReadLE32(rw) != waveID, "WAV: Not a WAVE file.", 0); BAIL_IF_MACRO(!find_chunk(rw, fmtID), "WAV: No format chunk.", 0); BAIL_IF_MACRO(!read_fmt_chunk(rw, fmt), "WAV: Can't read format chunk.", 0); sample->actual.channels = (Uint8) fmt->wChannels; sample->actual.rate = fmt->dwSamplesPerSec; if ((fmt->wBitsPerSample == 4) /*|| (fmt->wBitsPerSample == 0) */ ) sample->actual.format = AUDIO_S16SYS; /* !!! FIXME ? */ else if (fmt->wBitsPerSample == 8) sample->actual.format = AUDIO_U8; else if (fmt->wBitsPerSample == 16) sample->actual.format = AUDIO_S16LSB; else { SNDDBG(("WAV: %d bits per sample!?\n", (int) fmt->wBitsPerSample)); BAIL_MACRO("WAV: Unsupported sample size.", 0); } /* else */ BAIL_IF_MACRO(!read_fmt(rw, fmt), NULL, 0); BAIL_IF_MACRO(!find_chunk(rw, dataID), "WAV: No data chunk.", 0); BAIL_IF_MACRO(!read_data_chunk(rw, &d), "WAV: Can't read data chunk.", 0); w = (wav_t *) malloc(sizeof(wav_t)); BAIL_IF_MACRO(w == NULL, ERR_OUT_OF_MEMORY, 0); w->fmt = fmt; fmt->total_bytes = w->bytesLeft = d.chunkSize; fmt->data_starting_offset = SDL_RWtell(rw); /* !!! FIXME: Move this to Sound_SampleInfo ? */ fmt->sample_frame_size = ( ((sample->actual.format & 0xFF) / 8) * sample->actual.channels ); internal->decoder_private = (void *) w; sample->flags = SOUND_SAMPLEFLAG_NONE; SNDDBG(("WAV: Accepting data stream.\n")); return(1); /* we'll handle this data. */ } /* WAV_open_internal */ static int WAV_open(Sound_Sample *sample, const char *ext) { int rc; fmt_t *fmt = (fmt_t *) malloc(sizeof (fmt_t)); BAIL_IF_MACRO(fmt == NULL, ERR_OUT_OF_MEMORY, 0); memset(fmt, '\0', sizeof (fmt_t)); rc = WAV_open_internal(sample, ext, fmt); if (!rc) { if (fmt->free != NULL) fmt->free(fmt); free(fmt); } /* if */ return(rc); } /* WAV_open */ static void WAV_close(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; wav_t *w = (wav_t *) internal->decoder_private; if (w->fmt->free != NULL) w->fmt->free(w->fmt); free(w->fmt); free(w); } /* WAV_close */ static Uint32 WAV_read(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; wav_t *w = (wav_t *) internal->decoder_private; return(w->fmt->read_sample(sample)); } /* WAV_read */ static int WAV_rewind(Sound_Sample *sample) { Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; wav_t *w = (wav_t *) internal->decoder_private; fmt_t *fmt = w->fmt; int rc = SDL_RWseek(internal->rw, fmt->data_starting_offset, SEEK_SET); BAIL_IF_MACRO(rc != fmt->data_starting_offset, ERR_IO_ERROR, 0); w->bytesLeft = fmt->total_bytes; return(fmt->rewind_sample(sample)); } /* WAV_rewind */ #endif /* SOUND_SUPPORTS_WAV */ /* end of wav.c ... */