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comparison decoders/libmpg123/decode_4to1.c @ 562:7e08477b0fc1

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MP3 decoder upgrade work. Ripped out SMPEG and mpglib support, replaced it with "mpg123.c" and libmpg123. libmpg123 is a much better version of mpglib, so it should solve all the problems about MP3's not seeking, or most modern MP3's not playing at all, etc. Since you no longer have to make a tradeoff with SMPEG for features, and SMPEG is basically rotting, I removed it from the project. There is still work to be done with libmpg123...there are MMX, 3DNow, SSE, Altivec, etc decoders which we don't have enabled at the moment, and the build system could use some work to make this compile more cleanly, etc. Still: huge win.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 30 Jan 2009 02:44:47 -0500
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561:f2985e08589c 562:7e08477b0fc1
1 /*
2 decode_4to1.c: ...with 4to1 downsampling / decoding of every 4th sample
3
4 copyright 1995-2006 by the mpg123 project - free software under the terms of the LGPL 2.1
5 see COPYING and AUTHORS files in distribution or http://mpg123.org
6 initially written by Michael Hipp
7
8 dunno why it sounds THIS annoying (maybe we should adapt the window?)
9 absolutely not optimized for this operation
10 */
11
12 #include "mpg123lib_intern.h"
13
14 int synth_4to1_8bit(real *bandPtr, int channel, mpg123_handle *fr, int final)
15 {
16 sample_t samples_tmp[16];
17 sample_t *tmp1 = samples_tmp + channel;
18 int i,ret;
19
20 unsigned char *samples = fr->buffer.data;
21 int pnt = fr->buffer.fill;
22 fr->buffer.data = (unsigned char*) samples_tmp;
23 fr->buffer.fill = 0;
24 ret = synth_4to1(bandPtr,channel, fr, 0);
25 fr->buffer.data = samples;
26
27 samples += channel + pnt;
28 for(i=0;i<8;i++) {
29 #ifdef FLOATOUT
30 *samples = 0;
31 #else
32 *samples = fr->conv16to8[*tmp1>>AUSHIFT];
33 #endif
34 samples += 2;
35 tmp1 += 2;
36 }
37 fr->buffer.fill = pnt + (final ? 16 : 0);
38
39 return ret;
40 }
41
42 int synth_4to1_8bit_mono(real *bandPtr, mpg123_handle *fr)
43 {
44 sample_t samples_tmp[16];
45 sample_t *tmp1 = samples_tmp;
46 int i,ret;
47
48 unsigned char *samples = fr->buffer.data;
49 int pnt = fr->buffer.fill;
50 fr->buffer.data = (unsigned char*) samples_tmp;
51 fr->buffer.fill = 0;
52 ret = synth_4to1(bandPtr, 0, fr, 0);
53 fr->buffer.data = samples;
54
55 samples += pnt;
56 for(i=0;i<8;i++) {
57 #ifdef FLOATOUT
58 *samples++ = 0;
59 #else
60 *samples++ = fr->conv16to8[*tmp1>>AUSHIFT];
61 #endif
62 tmp1 += 2;
63 }
64 fr->buffer.fill = pnt + 8;
65
66 return ret;
67 }
68
69
70 int synth_4to1_8bit_mono2stereo(real *bandPtr, mpg123_handle *fr)
71 {
72 sample_t samples_tmp[16];
73 sample_t *tmp1 = samples_tmp;
74 int i,ret;
75
76 unsigned char *samples = fr->buffer.data;
77 int pnt = fr->buffer.fill;
78 fr->buffer.data = (unsigned char*) samples_tmp;
79 fr->buffer.fill = 0;
80 ret = synth_4to1(bandPtr, 0, fr, 0);
81 fr->buffer.data = samples;
82
83 samples += pnt;
84 for(i=0;i<8;i++) {
85 #ifdef FLOATOUT
86 *samples++ = 0;
87 *samples++ = 0;
88 #else
89 *samples++ = fr->conv16to8[*tmp1>>AUSHIFT];
90 *samples++ = fr->conv16to8[*tmp1>>AUSHIFT];
91 #endif
92 tmp1 += 2;
93 }
94 fr->buffer.fill = pnt + 16;
95
96 return ret;
97 }
98
99 int synth_4to1_mono(real *bandPtr, mpg123_handle *fr)
100 {
101 sample_t samples_tmp[16];
102 sample_t *tmp1 = samples_tmp;
103 int i,ret;
104
105 unsigned char *samples = fr->buffer.data;
106 int pnt = fr->buffer.fill;
107 fr->buffer.data = (unsigned char*) samples_tmp;
108 fr->buffer.fill = 0;
109 ret = synth_4to1(bandPtr, 0, fr, 0);
110 fr->buffer.data = samples;
111
112 samples += pnt;
113 for(i=0;i<8;i++) {
114 *( (sample_t *)samples) = *tmp1;
115 samples += sizeof(sample_t);
116 tmp1 += 2;
117 }
118 fr->buffer.fill = pnt + 8*sizeof(sample_t);
119
120 return ret;
121 }
122
123 int synth_4to1_mono2stereo(real *bandPtr, mpg123_handle *fr)
124 {
125 int i,ret;
126 unsigned char *samples = fr->buffer.data;
127
128 ret = synth_4to1(bandPtr, 0, fr, 1);
129 samples += fr->buffer.fill - 16*sizeof(sample_t);
130
131 for(i=0;i<8;i++) {
132 ((sample_t *)samples)[1] = ((sample_t *)samples)[0];
133 samples+=2*sizeof(sample_t);
134 }
135
136 return ret;
137 }
138
139 int synth_4to1(real *bandPtr,int channel, mpg123_handle *fr, int final)
140 {
141 static const int step = 2;
142 sample_t *samples = (sample_t *) (fr->buffer.data + fr->buffer.fill);
143
144 real *b0, **buf; /* (*buf)[0x110]; */
145 int clip = 0;
146 int bo1;
147
148 if(fr->have_eq_settings) do_equalizer(bandPtr,channel,fr->equalizer);
149
150 if(!channel) {
151 fr->bo[0]--;
152 fr->bo[0] &= 0xf;
153 buf = fr->real_buffs[0];
154 }
155 else {
156 samples++;
157 buf = fr->real_buffs[1];
158 }
159
160 if(fr->bo[0] & 0x1) {
161 b0 = buf[0];
162 bo1 = fr->bo[0];
163 opt_dct64(fr)(buf[1]+((fr->bo[0]+1)&0xf),buf[0]+fr->bo[0],bandPtr);
164 }
165 else {
166 b0 = buf[1];
167 bo1 = fr->bo[0]+1;
168 opt_dct64(fr)(buf[0]+fr->bo[0],buf[1]+fr->bo[0]+1,bandPtr);
169 }
170
171 {
172 register int j;
173 real *window = opt_decwin(fr) + 16 - bo1;
174
175 for (j=4;j;j--,b0+=0x30,window+=0x70)
176 {
177 real sum;
178 sum = REAL_MUL(*window++, *b0++);
179 sum -= REAL_MUL(*window++, *b0++);
180 sum += REAL_MUL(*window++, *b0++);
181 sum -= REAL_MUL(*window++, *b0++);
182 sum += REAL_MUL(*window++, *b0++);
183 sum -= REAL_MUL(*window++, *b0++);
184 sum += REAL_MUL(*window++, *b0++);
185 sum -= REAL_MUL(*window++, *b0++);
186 sum += REAL_MUL(*window++, *b0++);
187 sum -= REAL_MUL(*window++, *b0++);
188 sum += REAL_MUL(*window++, *b0++);
189 sum -= REAL_MUL(*window++, *b0++);
190 sum += REAL_MUL(*window++, *b0++);
191 sum -= REAL_MUL(*window++, *b0++);
192 sum += REAL_MUL(*window++, *b0++);
193 sum -= REAL_MUL(*window++, *b0++);
194
195 WRITE_SAMPLE(samples,sum,clip); samples += step;
196 #if 0
197 WRITE_SAMPLE(samples,sum,clip); samples += step;
198 WRITE_SAMPLE(samples,sum,clip); samples += step;
199 WRITE_SAMPLE(samples,sum,clip); samples += step;
200 #endif
201 }
202
203 {
204 real sum;
205 sum = REAL_MUL(window[0x0], b0[0x0]);
206 sum += REAL_MUL(window[0x2], b0[0x2]);
207 sum += REAL_MUL(window[0x4], b0[0x4]);
208 sum += REAL_MUL(window[0x6], b0[0x6]);
209 sum += REAL_MUL(window[0x8], b0[0x8]);
210 sum += REAL_MUL(window[0xA], b0[0xA]);
211 sum += REAL_MUL(window[0xC], b0[0xC]);
212 sum += REAL_MUL(window[0xE], b0[0xE]);
213 WRITE_SAMPLE(samples,sum,clip); samples += step;
214 #if 0
215 WRITE_SAMPLE(samples,sum,clip); samples += step;
216 WRITE_SAMPLE(samples,sum,clip); samples += step;
217 WRITE_SAMPLE(samples,sum,clip); samples += step;
218 #endif
219 b0-=0x40,window-=0x80;
220 }
221 window += bo1<<1;
222
223 for (j=3;j;j--,b0-=0x50,window-=0x70)
224 {
225 real sum;
226 sum = REAL_MUL(-*(--window), *b0++);
227 sum -= REAL_MUL(*(--window), *b0++);
228 sum -= REAL_MUL(*(--window), *b0++);
229 sum -= REAL_MUL(*(--window), *b0++);
230 sum -= REAL_MUL(*(--window), *b0++);
231 sum -= REAL_MUL(*(--window), *b0++);
232 sum -= REAL_MUL(*(--window), *b0++);
233 sum -= REAL_MUL(*(--window), *b0++);
234 sum -= REAL_MUL(*(--window), *b0++);
235 sum -= REAL_MUL(*(--window), *b0++);
236 sum -= REAL_MUL(*(--window), *b0++);
237 sum -= REAL_MUL(*(--window), *b0++);
238 sum -= REAL_MUL(*(--window), *b0++);
239 sum -= REAL_MUL(*(--window), *b0++);
240 sum -= REAL_MUL(*(--window), *b0++);
241 sum -= REAL_MUL(*(--window), *b0++);
242
243 WRITE_SAMPLE(samples,sum,clip); samples += step;
244 #if 0
245 WRITE_SAMPLE(samples,sum,clip); samples += step;
246 WRITE_SAMPLE(samples,sum,clip); samples += step;
247 WRITE_SAMPLE(samples,sum,clip); samples += step;
248 #endif
249 }
250 }
251
252 if(final) fr->buffer.fill += 16*sizeof(sample_t);
253
254 return clip;
255 }
256
257