Fix documentation of the return value of avcodec_encode_video().
[libav.git] / libavcodec / flacdec.c
CommitLineData
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1/*
2 * FLAC (Free Lossless Audio Codec) decoder
3 * Copyright (c) 2003 Alex Beregszaszi
4 *
b78e7197
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
4f52c312
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
4f52c312 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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20 */
21
22/**
8f51144b 23 * @file flacdec.c
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24 * FLAC (Free Lossless Audio Codec) decoder
25 * @author Alex Beregszaszi
9eda2f94
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26 *
27 * For more information on the FLAC format, visit:
28 * http://flac.sourceforge.net/
29 *
30 * This decoder can be used in 1 of 2 ways: Either raw FLAC data can be fed
31 * through, starting from the initial 'fLaC' signature; or by passing the
32 * 34-byte streaminfo structure through avctx->extradata[_size] followed
33 * by data starting with the 0xFFF8 marker.
4f52c312 34 */
115329f1 35
ac2570a8 36#include <limits.h>
115329f1 37
75c998a2 38#define ALT_BITSTREAM_READER
245976da 39#include "libavutil/crc.h"
4f52c312 40#include "avcodec.h"
caa336b4 41#include "bitstream.h"
4f52c312 42#include "golomb.h"
9d48410f 43#include "flac.h"
4f52c312 44
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45#undef NDEBUG
46#include <assert.h>
47
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48#define MAX_CHANNELS 8
49#define MAX_BLOCKSIZE 65535
50
9d656110 51enum decorrelation_type {
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52 INDEPENDENT,
53 LEFT_SIDE,
54 RIGHT_SIDE,
55 MID_SIDE,
56};
57
58typedef struct FLACContext {
9d48410f
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59 FLACSTREAMINFO
60
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61 AVCodecContext *avctx;
62 GetBitContext gb;
63
ac2570a8 64 int blocksize/*, last_blocksize*/;
9d48410f 65 int curr_bps;
9d656110 66 enum decorrelation_type decorrelation;
4f52c312 67
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68 int32_t *decoded[MAX_CHANNELS];
69 uint8_t *bitstream;
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70 unsigned int bitstream_size;
71 unsigned int bitstream_index;
f038fe8b 72 unsigned int allocated_bitstream_size;
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73} FLACContext;
74
cf2baeb3 75static const int sample_rate_table[] =
959e0006
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76{ 0,
77 88200, 176400, 192000,
4f52c312 78 8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
115329f1 79 0, 0, 0, 0 };
4f52c312 80
cf2baeb3 81static const int sample_size_table[] =
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82{ 0, 8, 12, 0, 16, 20, 24, 0 };
83
cf2baeb3 84static const int blocksize_table[] = {
115329f1
DB
85 0, 192, 576<<0, 576<<1, 576<<2, 576<<3, 0, 0,
86256<<0, 256<<1, 256<<2, 256<<3, 256<<4, 256<<5, 256<<6, 256<<7
0496a034
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87};
88
1bec121f
JR
89static int64_t get_utf8(GetBitContext *gb)
90{
9d82b0dd
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91 int64_t val;
92 GET_UTF8(val, get_bits(gb, 8), return -1;)
ac2570a8 93 return val;
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94}
95
17c90b9d
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96static void allocate_buffers(FLACContext *s);
97static int metadata_parse(FLACContext *s);
9eda2f94 98
1bec121f 99static av_cold int flac_decode_init(AVCodecContext *avctx)
4f52c312 100{
9eda2f94
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101 FLACContext *s = avctx->priv_data;
102 s->avctx = avctx;
103
17c90b9d
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104 if (avctx->extradata_size > 4) {
105 /* initialize based on the demuxer-supplied streamdata header */
17c90b9d 106 if (avctx->extradata_size == FLAC_STREAMINFO_SIZE) {
9f3d3ecf
JR
107 ff_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s,
108 avctx->extradata);
17c90b9d
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109 allocate_buffers(s);
110 } else {
512b37bb 111 init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
17c90b9d
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112 metadata_parse(s);
113 }
9eda2f94
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114 }
115
fd76c37f 116 avctx->sample_fmt = SAMPLE_FMT_S16;
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117 return 0;
118}
119
9482171b 120static void dump_headers(AVCodecContext *avctx, FLACStreaminfo *s)
4f52c312 121{
9f3d3ecf
JR
122 av_log(avctx, AV_LOG_DEBUG, " Blocksize: %d .. %d\n", s->min_blocksize,
123 s->max_blocksize);
4bc07e78
JR
124 av_log(avctx, AV_LOG_DEBUG, " Max Framesize: %d\n", s->max_framesize);
125 av_log(avctx, AV_LOG_DEBUG, " Samplerate: %d\n", s->samplerate);
126 av_log(avctx, AV_LOG_DEBUG, " Channels: %d\n", s->channels);
127 av_log(avctx, AV_LOG_DEBUG, " Bits: %d\n", s->bps);
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128}
129
1bec121f
JR
130static void allocate_buffers(FLACContext *s)
131{
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132 int i;
133
ac2570a8
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134 assert(s->max_blocksize);
135
1bec121f 136 if (s->max_framesize == 0 && s->max_blocksize) {
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137 // FIXME header overhead
138 s->max_framesize= (s->channels * s->bps * s->max_blocksize + 7)/ 8;
ac2570a8
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139 }
140
1bec121f 141 for (i = 0; i < s->channels; i++) {
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142 s->decoded[i] = av_realloc(s->decoded[i],
143 sizeof(int32_t)*s->max_blocksize);
ac2570a8
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144 }
145
1bec121f 146 if (s->allocated_bitstream_size < s->max_framesize)
9f3d3ecf
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147 s->bitstream= av_fast_realloc(s->bitstream,
148 &s->allocated_bitstream_size,
149 s->max_framesize);
ac2570a8
MN
150}
151
9482171b
JR
152void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
153 const uint8_t *buffer)
ac2570a8 154{
a128cc91
JR
155 GetBitContext gb;
156 init_get_bits(&gb, buffer, FLAC_STREAMINFO_SIZE*8);
157
4f52c312 158 /* mandatory streaminfo */
a128cc91
JR
159 s->min_blocksize = get_bits(&gb, 16);
160 s->max_blocksize = get_bits(&gb, 16);
4f52c312 161
a128cc91
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162 skip_bits(&gb, 24); /* skip min frame size */
163 s->max_framesize = get_bits_long(&gb, 24);
115329f1 164
a128cc91
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165 s->samplerate = get_bits_long(&gb, 20);
166 s->channels = get_bits(&gb, 3) + 1;
167 s->bps = get_bits(&gb, 5) + 1;
115329f1 168
a128cc91
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169 avctx->channels = s->channels;
170 avctx->sample_rate = s->samplerate;
4f52c312 171
aeb987ce
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172 s->samples = get_bits_long(&gb, 32) << 4;
173 s->samples |= get_bits_long(&gb, 4);
115329f1 174
a128cc91
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175 skip_bits(&gb, 64); /* md5 sum */
176 skip_bits(&gb, 64); /* md5 sum */
115329f1 177
4bc07e78 178 dump_headers(avctx, s);
17c90b9d
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179}
180
181/**
182 * Parse a list of metadata blocks. This list of blocks must begin with
183 * the fLaC marker.
184 * @param s the flac decoding context containing the gb bit reader used to
185 * parse metadata
186 * @return 1 if some metadata was read, 0 if no fLaC marker was found
187 */
188static int metadata_parse(FLACContext *s)
189{
190 int i, metadata_last, metadata_type, metadata_size, streaminfo_updated=0;
e0168e3b 191 int initial_pos= get_bits_count(&s->gb);
17c90b9d
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192
193 if (show_bits_long(&s->gb, 32) == MKBETAG('f','L','a','C')) {
194 skip_bits(&s->gb, 32);
195
17c90b9d 196 do {
5fc32c27 197 metadata_last = get_bits1(&s->gb);
17c90b9d
AJ
198 metadata_type = get_bits(&s->gb, 7);
199 metadata_size = get_bits_long(&s->gb, 24);
200
1bec121f 201 if (get_bits_count(&s->gb) + 8*metadata_size > s->gb.size_in_bits) {
e0168e3b
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202 skip_bits_long(&s->gb, initial_pos - get_bits_count(&s->gb));
203 break;
204 }
205
17c90b9d
AJ
206 if (metadata_size) {
207 switch (metadata_type) {
d38b8821 208 case FLAC_METADATA_TYPE_STREAMINFO:
9f3d3ecf
JR
209 ff_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s,
210 s->gb.buffer+get_bits_count(&s->gb)/8);
17c90b9d 211 streaminfo_updated = 1;
17c90b9d
AJ
212
213 default:
1bec121f 214 for (i = 0; i < metadata_size; i++)
17c90b9d
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215 skip_bits(&s->gb, 8);
216 }
217 }
218 } while (!metadata_last);
219
220 if (streaminfo_updated)
221 allocate_buffers(s);
222 return 1;
223 }
224 return 0;
4f52c312
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225}
226
227static int decode_residuals(FLACContext *s, int channel, int pred_order)
228{
229 int i, tmp, partition, method_type, rice_order;
230 int sample = 0, samples;
231
232 method_type = get_bits(&s->gb, 2);
1bec121f 233 if (method_type > 1) {
9f3d3ecf
JR
234 av_log(s->avctx, AV_LOG_ERROR, "illegal residual coding method %d\n",
235 method_type);
4f52c312 236 return -1;
ac2570a8 237 }
115329f1 238
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239 rice_order = get_bits(&s->gb, 4);
240
ac2570a8 241 samples= s->blocksize >> rice_order;
5484dad7 242 if (pred_order > samples) {
9f3d3ecf
JR
243 av_log(s->avctx, AV_LOG_ERROR, "invalid predictor order: %i > %i\n",
244 pred_order, samples);
5484dad7
RD
245 return -1;
246 }
4f52c312 247
115329f1 248 sample=
ac2570a8 249 i= pred_order;
1bec121f 250 for (partition = 0; partition < (1 << rice_order); partition++) {
e471443a 251 tmp = get_bits(&s->gb, method_type == 0 ? 4 : 5);
1bec121f 252 if (tmp == (method_type == 0 ? 15 : 31)) {
4f52c312 253 tmp = get_bits(&s->gb, 5);
4f52c312 254 for (; i < samples; i++, sample++)
4fd12598 255 s->decoded[channel][sample] = get_sbits(&s->gb, tmp);
1bec121f
JR
256 } else {
257 for (; i < samples; i++, sample++) {
4fd12598 258 s->decoded[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
ac2570a8 259 }
4f52c312 260 }
ac2570a8 261 i= 0;
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262 }
263
4f52c312 264 return 0;
115329f1 265}
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266
267static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order)
268{
08965b22
LM
269 const int blocksize = s->blocksize;
270 int32_t *decoded = s->decoded[channel];
271 int a, b, c, d, i;
115329f1 272
4f52c312 273 /* warm up samples */
1bec121f 274 for (i = 0; i < pred_order; i++) {
08965b22 275 decoded[i] = get_sbits(&s->gb, s->curr_bps);
4f52c312 276 }
115329f1 277
4f52c312
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278 if (decode_residuals(s, channel, pred_order) < 0)
279 return -1;
280
1bec121f 281 if (pred_order > 0)
1f4fa6a4 282 a = decoded[pred_order-1];
1bec121f 283 if (pred_order > 1)
1f4fa6a4 284 b = a - decoded[pred_order-2];
1bec121f 285 if (pred_order > 2)
1f4fa6a4 286 c = b - decoded[pred_order-2] + decoded[pred_order-3];
1bec121f 287 if (pred_order > 3)
1f4fa6a4 288 d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
08965b22 289
1bec121f
JR
290 switch (pred_order) {
291 case 0:
292 break;
293 case 1:
294 for (i = pred_order; i < blocksize; i++)
295 decoded[i] = a += decoded[i];
296 break;
297 case 2:
298 for (i = pred_order; i < blocksize; i++)
299 decoded[i] = a += b += decoded[i];
300 break;
301 case 3:
302 for (i = pred_order; i < blocksize; i++)
303 decoded[i] = a += b += c += decoded[i];
304 break;
305 case 4:
306 for (i = pred_order; i < blocksize; i++)
307 decoded[i] = a += b += c += d += decoded[i];
308 break;
309 default:
310 av_log(s->avctx, AV_LOG_ERROR, "illegal pred order %d\n", pred_order);
311 return -1;
4f52c312 312 }
ac2570a8 313
4f52c312
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314 return 0;
315}
316
317static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order)
318{
0187178e 319 int i, j;
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320 int coeff_prec, qlevel;
321 int coeffs[pred_order];
d1a5c421 322 int32_t *decoded = s->decoded[channel];
115329f1 323
4f52c312 324 /* warm up samples */
1bec121f 325 for (i = 0; i < pred_order; i++) {
d1a5c421 326 decoded[i] = get_sbits(&s->gb, s->curr_bps);
4f52c312 327 }
115329f1 328
4f52c312 329 coeff_prec = get_bits(&s->gb, 4) + 1;
1bec121f 330 if (coeff_prec == 16) {
5305f40b 331 av_log(s->avctx, AV_LOG_ERROR, "invalid coeff precision\n");
4f52c312
MN
332 return -1;
333 }
ac2570a8 334 qlevel = get_sbits(&s->gb, 5);
1bec121f 335 if (qlevel < 0) {
9f3d3ecf
JR
336 av_log(s->avctx, AV_LOG_ERROR, "qlevel %d not supported, maybe buggy stream\n",
337 qlevel);
9d656110
MN
338 return -1;
339 }
340
1bec121f 341 for (i = 0; i < pred_order; i++) {
ac2570a8 342 coeffs[i] = get_sbits(&s->gb, coeff_prec);
4f52c312 343 }
115329f1 344
4f52c312
MN
345 if (decode_residuals(s, channel, pred_order) < 0)
346 return -1;
347
0187178e
LB
348 if (s->bps > 16) {
349 int64_t sum;
1bec121f 350 for (i = pred_order; i < s->blocksize; i++) {
0187178e
LB
351 sum = 0;
352 for (j = 0; j < pred_order; j++)
d1a5c421
LM
353 sum += (int64_t)coeffs[j] * decoded[i-j-1];
354 decoded[i] += sum >> qlevel;
0187178e
LB
355 }
356 } else {
1bec121f 357 for (i = pred_order; i < s->blocksize-1; i += 2) {
d1a5c421
LM
358 int c;
359 int d = decoded[i-pred_order];
360 int s0 = 0, s1 = 0;
1bec121f 361 for (j = pred_order-1; j > 0; j--) {
d1a5c421 362 c = coeffs[j];
bd49d4fd 363 s0 += c*d;
d1a5c421
LM
364 d = decoded[i-j];
365 s1 += c*d;
bd49d4fd 366 }
d1a5c421
LM
367 c = coeffs[0];
368 s0 += c*d;
369 d = decoded[i] += s0 >> qlevel;
370 s1 += c*d;
371 decoded[i+1] += s1 >> qlevel;
bd49d4fd 372 }
1bec121f 373 if (i < s->blocksize) {
bd49d4fd 374 int sum = 0;
0187178e 375 for (j = 0; j < pred_order; j++)
d1a5c421
LM
376 sum += coeffs[j] * decoded[i-j-1];
377 decoded[i] += sum >> qlevel;
0187178e 378 }
4f52c312 379 }
115329f1 380
4f52c312
MN
381 return 0;
382}
383
384static inline int decode_subframe(FLACContext *s, int channel)
385{
386 int type, wasted = 0;
387 int i, tmp;
115329f1 388
4f52c312 389 s->curr_bps = s->bps;
1bec121f
JR
390 if (channel == 0) {
391 if (s->decorrelation == RIGHT_SIDE)
ac2570a8 392 s->curr_bps++;
1bec121f
JR
393 } else {
394 if (s->decorrelation == LEFT_SIDE || s->decorrelation == MID_SIDE)
ac2570a8
MN
395 s->curr_bps++;
396 }
397
1bec121f 398 if (get_bits1(&s->gb)) {
1cef211d 399 av_log(s->avctx, AV_LOG_ERROR, "invalid subframe padding\n");
4f52c312
MN
400 return -1;
401 }
402 type = get_bits(&s->gb, 6);
c5706efd 403
1bec121f 404 if (get_bits1(&s->gb)) {
4f52c312
MN
405 wasted = 1;
406 while (!get_bits1(&s->gb))
407 wasted++;
408 s->curr_bps -= wasted;
409 }
c5706efd 410
ac2570a8 411//FIXME use av_log2 for types
1bec121f 412 if (type == 0) {
ac2570a8 413 tmp = get_sbits(&s->gb, s->curr_bps);
4f52c312
MN
414 for (i = 0; i < s->blocksize; i++)
415 s->decoded[channel][i] = tmp;
1bec121f 416 } else if (type == 1) {
4f52c312 417 for (i = 0; i < s->blocksize; i++)
ac2570a8 418 s->decoded[channel][i] = get_sbits(&s->gb, s->curr_bps);
1bec121f 419 } else if ((type >= 8) && (type <= 12)) {
4f52c312
MN
420 if (decode_subframe_fixed(s, channel, type & ~0x8) < 0)
421 return -1;
1bec121f 422 } else if (type >= 32) {
4f52c312
MN
423 if (decode_subframe_lpc(s, channel, (type & ~0x20)+1) < 0)
424 return -1;
1bec121f 425 } else {
1cef211d 426 av_log(s->avctx, AV_LOG_ERROR, "invalid coding type\n");
4f52c312
MN
427 return -1;
428 }
115329f1 429
1bec121f 430 if (wasted) {
4f52c312
MN
431 int i;
432 for (i = 0; i < s->blocksize; i++)
433 s->decoded[channel][i] <<= wasted;
434 }
435
436 return 0;
437}
438
ac66834c 439static int decode_frame(FLACContext *s, int alloc_data_size)
4f52c312 440{
9d656110 441 int blocksize_code, sample_rate_code, sample_size_code, assignment, i, crc8;
0496a034 442 int decorrelation, bps, blocksize, samplerate;
115329f1 443
4f52c312 444 blocksize_code = get_bits(&s->gb, 4);
4f52c312
MN
445
446 sample_rate_code = get_bits(&s->gb, 4);
115329f1 447
4f52c312 448 assignment = get_bits(&s->gb, 4); /* channel assignment */
0496a034
MN
449 if (assignment < 8 && s->channels == assignment+1)
450 decorrelation = INDEPENDENT;
451 else if (assignment >=8 && assignment < 11 && s->channels == 2)
452 decorrelation = LEFT_SIDE + assignment - 8;
1bec121f 453 else {
9f3d3ecf
JR
454 av_log(s->avctx, AV_LOG_ERROR, "unsupported channel assignment %d (channels=%d)\n",
455 assignment, s->channels);
4f52c312
MN
456 return -1;
457 }
115329f1 458
4f52c312 459 sample_size_code = get_bits(&s->gb, 3);
1bec121f 460 if (sample_size_code == 0)
0496a034 461 bps= s->bps;
1bec121f 462 else if ((sample_size_code != 3) && (sample_size_code != 7))
0496a034 463 bps = sample_size_table[sample_size_code];
1bec121f 464 else {
9f3d3ecf
JR
465 av_log(s->avctx, AV_LOG_ERROR, "invalid sample size code (%d)\n",
466 sample_size_code);
4f52c312
MN
467 return -1;
468 }
469
1bec121f 470 if (get_bits1(&s->gb)) {
1cef211d 471 av_log(s->avctx, AV_LOG_ERROR, "broken stream, invalid padding\n");
0496a034 472 return -1;
4f52c312 473 }
115329f1 474
1bec121f 475 if (get_utf8(&s->gb) < 0) {
0496a034
MN
476 av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
477 return -1;
478 }
115329f1 479
ac2570a8 480 if (blocksize_code == 0)
0496a034 481 blocksize = s->min_blocksize;
ac2570a8 482 else if (blocksize_code == 6)
0496a034 483 blocksize = get_bits(&s->gb, 8)+1;
ac2570a8 484 else if (blocksize_code == 7)
0496a034 485 blocksize = get_bits(&s->gb, 16)+1;
115329f1 486 else
0496a034 487 blocksize = blocksize_table[blocksize_code];
4f52c312 488
1bec121f 489 if (blocksize > s->max_blocksize) {
9f3d3ecf
JR
490 av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", blocksize,
491 s->max_blocksize);
ac2570a8
MN
492 return -1;
493 }
494
1bec121f 495 if (blocksize * s->channels * sizeof(int16_t) > alloc_data_size)
ac66834c
MN
496 return -1;
497
1bec121f 498 if (sample_rate_code == 0)
0496a034 499 samplerate= s->samplerate;
1bec121f 500 else if (sample_rate_code < 12)
0496a034 501 samplerate = sample_rate_table[sample_rate_code];
ac2570a8 502 else if (sample_rate_code == 12)
0496a034 503 samplerate = get_bits(&s->gb, 8) * 1000;
ac2570a8 504 else if (sample_rate_code == 13)
0496a034 505 samplerate = get_bits(&s->gb, 16);
ac2570a8 506 else if (sample_rate_code == 14)
0496a034 507 samplerate = get_bits(&s->gb, 16) * 10;
1bec121f 508 else {
9f3d3ecf
JR
509 av_log(s->avctx, AV_LOG_ERROR, "illegal sample rate code %d\n",
510 sample_rate_code);
ac2570a8 511 return -1;
4f52c312
MN
512 }
513
9d656110 514 skip_bits(&s->gb, 8);
3abe5fbd
AJ
515 crc8 = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0,
516 s->gb.buffer, get_bits_count(&s->gb)/8);
1bec121f 517 if (crc8) {
160d679c 518 av_log(s->avctx, AV_LOG_ERROR, "header crc mismatch crc=%2X\n", crc8);
9d656110
MN
519 return -1;
520 }
115329f1 521
0496a034
MN
522 s->blocksize = blocksize;
523 s->samplerate = samplerate;
524 s->bps = bps;
525 s->decorrelation= decorrelation;
4f52c312 526
9482171b 527// dump_headers(s->avctx, (FLACStreaminfo *)s);
4f52c312
MN
528
529 /* subframes */
1bec121f 530 for (i = 0; i < s->channels; i++) {
4f52c312
MN
531 if (decode_subframe(s, i) < 0)
532 return -1;
533 }
115329f1 534
4f52c312
MN
535 align_get_bits(&s->gb);
536
537 /* frame footer */
538 skip_bits(&s->gb, 16); /* data crc */
539
540 return 0;
541}
542
543static int flac_decode_frame(AVCodecContext *avctx,
544 void *data, int *data_size,
1545c5e5 545 const uint8_t *buf, int buf_size)
4f52c312
MN
546{
547 FLACContext *s = avctx->priv_data;
3f1899a8
MM
548 int tmp = 0, i, j = 0, input_buf_size = 0;
549 int16_t *samples = data;
ac66834c
MN
550 int alloc_data_size= *data_size;
551
552 *data_size=0;
4f52c312 553
1bec121f 554 if (s->max_framesize == 0) {
d3ce0792 555 s->max_framesize= FFMAX(4, buf_size); // should hopefully be enough for the first header
ac2570a8
MN
556 s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
557 }
558
1bec121f 559 if (1 && s->max_framesize) { //FIXME truncated
1df0390e
JR
560 if (s->bitstream_size < 4 || AV_RL32(s->bitstream) != MKTAG('f','L','a','C'))
561 buf_size= FFMIN(buf_size, s->max_framesize - FFMIN(s->bitstream_size, s->max_framesize));
562 input_buf_size= buf_size;
ac2570a8 563
1df0390e
JR
564 if (s->bitstream_size + buf_size < buf_size || s->bitstream_index + s->bitstream_size + buf_size < s->bitstream_index)
565 return -1;
e0168e3b 566
1df0390e
JR
567 if (s->allocated_bitstream_size < s->bitstream_size + buf_size)
568 s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->bitstream_size + buf_size);
e0168e3b 569
1df0390e 570 if (s->bitstream_index + s->bitstream_size + buf_size > s->allocated_bitstream_size) {
9f3d3ecf
JR
571 memmove(s->bitstream, &s->bitstream[s->bitstream_index],
572 s->bitstream_size);
1df0390e
JR
573 s->bitstream_index=0;
574 }
9f3d3ecf
JR
575 memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size],
576 buf, buf_size);
1df0390e
JR
577 buf= &s->bitstream[s->bitstream_index];
578 buf_size += s->bitstream_size;
579 s->bitstream_size= buf_size;
115329f1 580
1df0390e
JR
581 if (buf_size < s->max_framesize && input_buf_size) {
582 return input_buf_size;
583 }
ac2570a8 584 }
4f52c312
MN
585
586 init_get_bits(&s->gb, buf, buf_size*8);
115329f1 587
1bec121f 588 if (metadata_parse(s))
2b4b8c82
MN
589 goto end;
590
13de8a08 591 tmp = show_bits(&s->gb, 16);
1bec121f 592 if ((tmp & 0xFFFE) != 0xFFF8) {
13de8a08 593 av_log(s->avctx, AV_LOG_ERROR, "FRAME HEADER not here\n");
1bec121f 594 while (get_bits_count(&s->gb)/8+2 < buf_size && (show_bits(&s->gb, 16) & 0xFFFE) != 0xFFF8)
13de8a08
JR
595 skip_bits(&s->gb, 8);
596 goto end; // we may not have enough bits left to decode a frame, so try next time
597 }
598 skip_bits(&s->gb, 16);
1bec121f 599 if (decode_frame(s, alloc_data_size) < 0) {
13de8a08
JR
600 av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
601 s->bitstream_size=0;
602 s->bitstream_index=0;
603 return -1;
604 }
ac2570a8 605
c448303d
MN
606#define DECORRELATE(left, right)\
607 assert(s->channels == 2);\
1bec121f 608 for (i = 0; i < s->blocksize; i++) {\
c448303d
MN
609 int a= s->decoded[0][i];\
610 int b= s->decoded[1][i];\
71fd1225
BF
611 *samples++ = ((left) << (24 - s->bps)) >> 8;\
612 *samples++ = ((right) << (24 - s->bps)) >> 8;\
c448303d
MN
613 }\
614 break;
615
1bec121f
JR
616 switch (s->decorrelation) {
617 case INDEPENDENT:
618 for (j = 0; j < s->blocksize; j++) {
619 for (i = 0; i < s->channels; i++)
620 *samples++ = (s->decoded[i][j] << (24 - s->bps)) >> 8;
621 }
622 break;
623 case LEFT_SIDE:
624 DECORRELATE(a,a-b)
625 case RIGHT_SIDE:
626 DECORRELATE(a+b,b)
627 case MID_SIDE:
628 DECORRELATE( (a-=b>>1) + b, a)
4f52c312 629 }
4f52c312 630
ac2570a8 631 *data_size = (int8_t *)samples - (int8_t *)data;
4f52c312 632
ac2570a8 633end:
cea96420 634 i= (get_bits_count(&s->gb)+7)/8;
1bec121f 635 if (i > buf_size) {
ac2570a8 636 av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", i - buf_size);
9d656110
MN
637 s->bitstream_size=0;
638 s->bitstream_index=0;
ac2570a8
MN
639 return -1;
640 }
4f52c312 641
1bec121f 642 if (s->bitstream_size) {
ac2570a8
MN
643 s->bitstream_index += i;
644 s->bitstream_size -= i;
645 return input_buf_size;
1bec121f 646 } else
ac2570a8 647 return i;
4f52c312
MN
648}
649
98a6fff9 650static av_cold int flac_decode_close(AVCodecContext *avctx)
4f52c312
MN
651{
652 FLACContext *s = avctx->priv_data;
653 int i;
115329f1 654
1bec121f 655 for (i = 0; i < s->channels; i++) {
ac2570a8 656 av_freep(&s->decoded[i]);
4f52c312 657 }
ac2570a8 658 av_freep(&s->bitstream);
115329f1 659
4f52c312
MN
660 return 0;
661}
662
1bec121f
JR
663static void flac_flush(AVCodecContext *avctx)
664{
1e31d32c
MN
665 FLACContext *s = avctx->priv_data;
666
667 s->bitstream_size=
668 s->bitstream_index= 0;
669}
670
4f52c312
MN
671AVCodec flac_decoder = {
672 "flac",
673 CODEC_TYPE_AUDIO,
674 CODEC_ID_FLAC,
675 sizeof(FLACContext),
676 flac_decode_init,
677 NULL,
678 flac_decode_close,
679 flac_decode_frame,
4c453ddb 680 CODEC_CAP_DELAY,
115329f1 681 .flush= flac_flush,
fe4bf374 682 .long_name= NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
4f52c312 683};