FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/flacdec.c
Date: 2025-12-07 22:02:57
Exec Total Coverage
Lines: 267 401 66.6%
Functions: 14 18 77.8%
Branches: 174 328 53.0%
Line Branch Exec Source
1 /*
2 * FLAC (Free Lossless Audio Codec) decoder
3 * Copyright (c) 2003 Alex Beregszaszi
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
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
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * FLAC (Free Lossless Audio Codec) decoder
25 * @author Alex Beregszaszi
26 * @see http://flac.sourceforge.net/
27 *
28 * This decoder can be used in 1 of 2 ways: Either raw FLAC data can be fed
29 * through, starting from the initial 'fLaC' signature; or by passing the
30 * 34-byte streaminfo structure through avctx->extradata[_size] followed
31 * by data starting with the 0xFFF8 marker.
32 */
33
34 #include <limits.h>
35
36 #include "libavutil/avassert.h"
37 #include "libavutil/crc.h"
38 #include "libavutil/mem.h"
39 #include "libavutil/opt.h"
40 #include "avcodec.h"
41 #include "codec_internal.h"
42 #include "get_bits.h"
43 #include "golomb.h"
44 #include "flac.h"
45 #include "flacdsp.h"
46 #include "flac_parse.h"
47 #include "thread.h"
48 #include "unary.h"
49
50
51 typedef struct FLACContext {
52 AVClass *class;
53 FLACStreaminfo stream_info;
54
55 AVCodecContext *avctx; ///< parent AVCodecContext
56 GetBitContext gb; ///< GetBitContext initialized to start at the current frame
57
58 int blocksize; ///< number of samples in the current frame
59 int sample_shift; ///< shift required to make output samples 16-bit or 32-bit
60 int ch_mode; ///< channel decorrelation type in the current frame
61 int got_streaminfo; ///< indicates if the STREAMINFO has been read
62
63 int32_t *decoded[FLAC_MAX_CHANNELS]; ///< decoded samples
64 uint8_t *decoded_buffer;
65 unsigned int decoded_buffer_size;
66 int64_t *decoded_33bps; ///< decoded samples for a 33 bps subframe
67 uint8_t *decoded_buffer_33bps;
68 unsigned int decoded_buffer_size_33bps;
69 int buggy_lpc; ///< use workaround for old lavc encoded files
70
71 FLACDSPContext dsp;
72 } FLACContext;
73
74 static int allocate_buffers(FLACContext *s);
75
76 273 static void flac_set_bps(FLACContext *s)
77 {
78 273 enum AVSampleFormat req = s->avctx->request_sample_fmt;
79 273 int need32 = s->stream_info.bps > 16;
80 273 int want32 = av_get_bytes_per_sample(req) > 2;
81 273 int planar = av_sample_fmt_is_planar(req);
82
83
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 273 if (need32 || want32) {
84
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 22 if (planar)
85 ✗ s->avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
86 else
87 22 s->avctx->sample_fmt = AV_SAMPLE_FMT_S32;
88 22 s->sample_shift = 32 - s->stream_info.bps;
89 } else {
90
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 251 if (planar)
91 ✗ s->avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
92 else
93 251 s->avctx->sample_fmt = AV_SAMPLE_FMT_S16;
94 251 s->sample_shift = 16 - s->stream_info.bps;
95 }
96 273 }
97
98 273 static av_cold int flac_decode_init(AVCodecContext *avctx)
99 {
100 uint8_t *streaminfo;
101 int ret;
102 273 FLACContext *s = avctx->priv_data;
103 273 s->avctx = avctx;
104
105 /* for now, the raw FLAC header is allowed to be passed to the decoder as
106 frame data instead of extradata. */
107
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 273 if (!avctx->extradata)
108 16 return 0;
109
110
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 257 if (!ff_flac_is_extradata_valid(avctx, &streaminfo))
111 ✗ return AVERROR_INVALIDDATA;
112
113 /* initialize based on the demuxer-supplied streamdata header */
114 257 ret = ff_flac_parse_streaminfo(avctx, &s->stream_info, streaminfo);
115
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 257 if (ret < 0)
116 ✗ return ret;
117 257 ret = allocate_buffers(s);
118
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 257 if (ret < 0)
119 ✗ return ret;
120 257 flac_set_bps(s);
121 257 ff_flacdsp_init(&s->dsp, avctx->sample_fmt,
122 s->stream_info.channels);
123 257 s->got_streaminfo = 1;
124
125 257 return 0;
126 }
127
128 16 static void dump_headers(AVCodecContext *avctx, FLACStreaminfo *s)
129 {
130 16 av_log(avctx, AV_LOG_DEBUG, " Max Blocksize: %d\n", s->max_blocksize);
131 16 av_log(avctx, AV_LOG_DEBUG, " Max Framesize: %d\n", s->max_framesize);
132 16 av_log(avctx, AV_LOG_DEBUG, " Samplerate: %d\n", s->samplerate);
133 16 av_log(avctx, AV_LOG_DEBUG, " Channels: %d\n", s->channels);
134 16 av_log(avctx, AV_LOG_DEBUG, " Bits: %d\n", s->bps);
135 16 }
136
137 273 static int allocate_buffers(FLACContext *s)
138 {
139 int buf_size;
140 int ret;
141
142
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 273 av_assert0(s->stream_info.max_blocksize);
143
144 273 buf_size = av_samples_get_buffer_size(NULL, s->stream_info.channels,
145 s->stream_info.max_blocksize,
146 AV_SAMPLE_FMT_S32P, 0);
147
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 273 if (buf_size < 0)
148 ✗ return buf_size;
149
150 273 av_fast_malloc(&s->decoded_buffer, &s->decoded_buffer_size, buf_size);
151
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 273 if (!s->decoded_buffer)
152 ✗ return AVERROR(ENOMEM);
153
154 273 ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
155 273 s->decoded_buffer,
156 s->stream_info.channels,
157 s->stream_info.max_blocksize,
158 AV_SAMPLE_FMT_S32P, 0);
159
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 273 if (ret >= 0 && s->stream_info.bps == 32 && s->stream_info.channels == 2) {
160 2 buf_size = av_samples_get_buffer_size(NULL, 1,
161 s->stream_info.max_blocksize,
162 AV_SAMPLE_FMT_S64P, 0);
163
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 2 if (buf_size < 0)
164 ✗ return buf_size;
165
166 2 av_fast_malloc(&s->decoded_buffer_33bps, &s->decoded_buffer_size_33bps, buf_size);
167
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 2 if (!s->decoded_buffer_33bps)
168 ✗ return AVERROR(ENOMEM);
169
170 2 ret = av_samples_fill_arrays((uint8_t **)&s->decoded_33bps, NULL,
171 2 s->decoded_buffer_33bps,
172 1,
173 s->stream_info.max_blocksize,
174 AV_SAMPLE_FMT_S64P, 0);
175
176 }
177 273 return ret < 0 ? ret : 0;
178 }
179
180 /**
181 * Parse the STREAMINFO from an inline header.
182 * @param s the flac decoding context
183 * @param buf input buffer, starting with the "fLaC" marker
184 * @param buf_size buffer size
185 * @return non-zero if metadata is invalid
186 */
187 ✗ static int parse_streaminfo(FLACContext *s, const uint8_t *buf, int buf_size)
188 {
189 int metadata_type, metadata_size, ret;
190
191 ✗ if (buf_size < FLAC_STREAMINFO_SIZE+8) {
192 /* need more data */
193 ✗ return 0;
194 }
195 ✗ flac_parse_block_header(&buf[4], NULL, &metadata_type, &metadata_size);
196 ✗ if (metadata_type != FLAC_METADATA_TYPE_STREAMINFO ||
197 ✗ metadata_size != FLAC_STREAMINFO_SIZE) {
198 ✗ return AVERROR_INVALIDDATA;
199 }
200 ✗ ret = ff_flac_parse_streaminfo(s->avctx, &s->stream_info, &buf[8]);
201 ✗ if (ret < 0)
202 ✗ return ret;
203 ✗ ret = allocate_buffers(s);
204 ✗ if (ret < 0)
205 ✗ return ret;
206 ✗ flac_set_bps(s);
207 ✗ ff_flacdsp_init(&s->dsp, s->avctx->sample_fmt,
208 s->stream_info.channels);
209 ✗ s->got_streaminfo = 1;
210
211 ✗ return 0;
212 }
213
214 /**
215 * Determine the size of an inline header.
216 * @param buf input buffer, starting with the "fLaC" marker
217 * @param buf_size buffer size
218 * @return number of bytes in the header, or 0 if more data is needed
219 */
220 ✗ static int get_metadata_size(const uint8_t *buf, int buf_size)
221 {
222 int metadata_last, metadata_size;
223 ✗ const uint8_t *buf_end = buf + buf_size;
224
225 ✗ buf += 4;
226 do {
227 ✗ if (buf_end - buf < 4)
228 ✗ return AVERROR_INVALIDDATA;
229 ✗ flac_parse_block_header(buf, &metadata_last, NULL, &metadata_size);
230 ✗ buf += 4;
231 ✗ if (buf_end - buf < metadata_size) {
232 /* need more data in order to read the complete header */
233 ✗ return AVERROR_INVALIDDATA;
234 }
235 ✗ buf += metadata_size;
236 ✗ } while (!metadata_last);
237
238 ✗ return buf_size - (buf_end - buf);
239 }
240
241 10545 static int decode_residuals(FLACContext *s, int32_t *decoded, int pred_order)
242 {
243 10545 GetBitContext gb = s->gb;
244 int i, tmp, partition, method_type, rice_order;
245 int rice_bits, rice_esc;
246 int samples;
247
248 10545 method_type = get_bits(&gb, 2);
249 10545 rice_order = get_bits(&gb, 4);
250
251 10545 samples = s->blocksize >> rice_order;
252 10545 rice_bits = 4 + method_type;
253 10545 rice_esc = (1 << rice_bits) - 1;
254
255 10545 decoded += pred_order;
256 10545 i = pred_order;
257
258
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 10545 if (method_type > 1) {
259 ✗ av_log(s->avctx, AV_LOG_ERROR, "illegal residual coding method %d\n",
260 method_type);
261 ✗ return AVERROR_INVALIDDATA;
262 }
263
264
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 10545 if (samples << rice_order != s->blocksize) {
265 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid rice order: %i blocksize %i\n",
266 rice_order, s->blocksize);
267 ✗ return AVERROR_INVALIDDATA;
268 }
269
270
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 10545 if (pred_order > samples) {
271 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid predictor order: %i > %i\n",
272 pred_order, samples);
273 ✗ return AVERROR_INVALIDDATA;
274 }
275
276
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 148219 for (partition = 0; partition < (1 << rice_order); partition++) {
277 137675 tmp = get_bits(&gb, rice_bits);
278
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 137675 if (tmp == rice_esc) {
279 ✗ tmp = get_bits(&gb, 5);
280 ✗ for (; i < samples; i++)
281 ✗ *decoded++ = get_sbits_long(&gb, tmp);
282 } else {
283
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 137675 int real_limit = (tmp > 1) ? (INT_MAX >> (tmp - 1)) + 2 : INT_MAX;
284
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 58158649 for (; i < samples; i++) {
285 58020975 int v = get_sr_golomb_flac(&gb, tmp, real_limit, 1);
286
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 58020975 if (v == 0x80000000){
287 1 av_log(s->avctx, AV_LOG_ERROR, "invalid residual\n");
288 1 return AVERROR_INVALIDDATA;
289 }
290
291 58020974 *decoded++ = v;
292 }
293 }
294 137674 i= 0;
295 }
296
297 10544 s->gb = gb;
298
299 10544 return 0;
300 }
301
302 935 static int decode_subframe_fixed(FLACContext *s, int32_t *decoded,
303 int pred_order, int bps)
304 {
305 935 const int blocksize = s->blocksize;
306 935 unsigned av_uninit(a), av_uninit(b), av_uninit(c), av_uninit(d);
307 int i;
308 int ret;
309
310 /* warm up samples */
311
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 3597 for (i = 0; i < pred_order; i++) {
312 2662 decoded[i] = get_sbits_long(&s->gb, bps);
313 }
314
315
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 935 if ((ret = decode_residuals(s, decoded, pred_order)) < 0)
316 ✗ return ret;
317
318
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 935 if (pred_order > 0)
319 837 a = decoded[pred_order-1];
320
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 935 if (pred_order > 1)
321 721 b = a - decoded[pred_order-2];
322
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 935 if (pred_order > 2)
323 591 c = b - decoded[pred_order-2] + decoded[pred_order-3];
324
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 935 if (pred_order > 3)
325 513 d = c - decoded[pred_order-2] + 2U*decoded[pred_order-3] - decoded[pred_order-4];
326
327
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 935 switch (pred_order) {
328 98 case 0:
329 98 break;
330 116 case 1:
331
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 505856 for (i = pred_order; i < blocksize; i++)
332 505740 decoded[i] = a += decoded[i];
333 116 break;
334 130 case 2:
335
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 549770 for (i = pred_order; i < blocksize; i++)
336 549640 decoded[i] = a += b += decoded[i];
337 130 break;
338 78 case 3:
339
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 117348 for (i = pred_order; i < blocksize; i++)
340 117270 decoded[i] = a += b += c += decoded[i];
341 78 break;
342 513 case 4:
343
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 587997 for (i = pred_order; i < blocksize; i++)
344 587484 decoded[i] = a += b += c += d += decoded[i];
345 513 break;
346 ✗ default:
347 ✗ av_log(s->avctx, AV_LOG_ERROR, "illegal pred order %d\n", pred_order);
348 ✗ return AVERROR_INVALIDDATA;
349 }
350
351 935 return 0;
352 }
353
354 #define DECODER_SUBFRAME_FIXED_WIDE(residual) { \
355 const int blocksize = s->blocksize; \
356 int ret; \
357 \
358 if ((ret = decode_residuals(s, residual, pred_order)) < 0) \
359 return ret; \
360 \
361 switch (pred_order) { \
362 case 0: \
363 for (int i = pred_order; i < blocksize; i++) \
364 decoded[i] = residual[i]; \
365 break; \
366 case 1: \
367 for (int i = pred_order; i < blocksize; i++) \
368 decoded[i] = (uint64_t)residual[i] + (uint64_t)decoded[i-1];\
369 break; \
370 case 2: \
371 for (int i = pred_order; i < blocksize; i++) \
372 decoded[i] = (uint64_t)residual[i] + 2*(uint64_t)decoded[i-1] - (uint64_t)decoded[i-2]; \
373 break; \
374 case 3: \
375 for (int i = pred_order; i < blocksize; i++) \
376 decoded[i] = (uint64_t)residual[i] + 3*(uint64_t)decoded[i-1] - 3*(uint64_t)decoded[i-2] + (uint64_t)decoded[i-3]; \
377 break; \
378 case 4: \
379 for (int i = pred_order; i < blocksize; i++) \
380 decoded[i] = (uint64_t)residual[i] + 4*(uint64_t)decoded[i-1] - 6*(uint64_t)decoded[i-2] + 4*(uint64_t)decoded[i-3] - (uint64_t)decoded[i-4]; \
381 break; \
382 default: \
383 av_log(s->avctx, AV_LOG_ERROR, "illegal pred order %d\n", pred_order); \
384 return AVERROR_INVALIDDATA; \
385 } \
386 return 0; \
387 }
388
389 ✗ static int decode_subframe_fixed_wide(FLACContext *s, int32_t *decoded,
390 int pred_order, int bps)
391 {
392 /* warm up samples */
393 ✗ for (int i = 0; i < pred_order; i++) {
394 ✗ decoded[i] = get_sbits_long(&s->gb, bps);
395 }
396 ✗ DECODER_SUBFRAME_FIXED_WIDE(decoded);
397 }
398
399
400 ✗ static int decode_subframe_fixed_33bps(FLACContext *s, int64_t *decoded,
401 int32_t *residual, int pred_order)
402 {
403 /* warm up samples */ \
404 ✗ for (int i = 0; i < pred_order; i++) { \
405 ✗ decoded[i] = get_sbits64(&s->gb, 33); \
406 } \
407 ✗ DECODER_SUBFRAME_FIXED_WIDE(residual);
408 }
409
410 1987 static void lpc_analyze_remodulate(SUINT32 *decoded, const int coeffs[32],
411 int order, int qlevel, int len, int bps)
412 {
413 int i, j;
414 1987 int ebps = 1 << (bps-1);
415 1987 unsigned sigma = 0;
416
417
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 8728429 for (i = order; i < len; i++)
418 8726442 sigma |= decoded[i] + ebps;
419
420
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 1987 if (sigma < 2*ebps)
421 1987 return;
422
423 ✗ for (i = len - 1; i >= order; i--) {
424 ✗ int64_t p = 0;
425 ✗ for (j = 0; j < order; j++)
426 ✗ p += coeffs[j] * (int64_t)(int32_t)decoded[i-order+j];
427 ✗ decoded[i] -= p >> qlevel;
428 }
429 ✗ for (i = order; i < len; i++, decoded++) {
430 ✗ int32_t p = 0;
431 ✗ for (j = 0; j < order; j++)
432 ✗ p += coeffs[j] * (uint32_t)decoded[j];
433 ✗ decoded[j] += p >> qlevel;
434 }
435 }
436
437 9608 static int decode_subframe_lpc(FLACContext *s, int32_t *decoded, int pred_order,
438 int bps)
439 {
440 int i, ret;
441 int coeff_prec, qlevel;
442 int coeffs[32];
443
444 /* warm up samples */
445
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 51467 for (i = 0; i < pred_order; i++) {
446 41859 decoded[i] = get_sbits_long(&s->gb, bps);
447 }
448
449 9608 coeff_prec = get_bits(&s->gb, 4) + 1;
450
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 9608 if (coeff_prec == 16) {
451 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid coeff precision\n");
452 ✗ return AVERROR_INVALIDDATA;
453 }
454 9608 qlevel = get_sbits(&s->gb, 5);
455
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 9608 if (qlevel < 0) {
456 ✗ av_log(s->avctx, AV_LOG_ERROR, "qlevel %d not supported, maybe buggy stream\n",
457 qlevel);
458 ✗ return AVERROR_INVALIDDATA;
459 }
460
461
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 51467 for (i = 0; i < pred_order; i++) {
462 41859 coeffs[pred_order - i - 1] = get_sbits(&s->gb, coeff_prec);
463 }
464
465
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 9608 if ((ret = decode_residuals(s, decoded, pred_order)) < 0)
466 1 return ret;
467
468
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 9607 if ( ( s->buggy_lpc && s->stream_info.bps <= 16)
469
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 9607 || ( !s->buggy_lpc && bps <= 16
470
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 6921 && bps + coeff_prec + av_log2(pred_order) <= 32)) {
471 6173 s->dsp.lpc16(decoded, coeffs, pred_order, qlevel, s->blocksize);
472 } else {
473 3434 s->dsp.lpc32(decoded, coeffs, pred_order, qlevel, s->blocksize);
474
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 3434 if (s->stream_info.bps <= 16)
475 1987 lpc_analyze_remodulate(decoded, coeffs, pred_order, qlevel, s->blocksize, bps);
476 }
477
478 9607 return 0;
479 }
480
481 2 static int decode_subframe_lpc_33bps(FLACContext *s, int64_t *decoded,
482 int32_t *residual, int pred_order)
483 {
484 int i, ret;
485 int coeff_prec, qlevel;
486 int coeffs[32];
487
488 /* warm up samples */
489
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 18 for (i = 0; i < pred_order; i++) {
490 16 decoded[i] = get_sbits64(&s->gb, 33);
491 }
492
493 2 coeff_prec = get_bits(&s->gb, 4) + 1;
494
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 2 if (coeff_prec == 16) {
495 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid coeff precision\n");
496 ✗ return AVERROR_INVALIDDATA;
497 }
498 2 qlevel = get_sbits(&s->gb, 5);
499
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 2 if (qlevel < 0) {
500 ✗ av_log(s->avctx, AV_LOG_ERROR, "qlevel %d not supported, maybe buggy stream\n",
501 qlevel);
502 ✗ return AVERROR_INVALIDDATA;
503 }
504
505
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 18 for (i = 0; i < pred_order; i++) {
506 16 coeffs[pred_order - i - 1] = get_sbits(&s->gb, coeff_prec);
507 }
508
509
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 2 if ((ret = decode_residuals(s, residual, pred_order)) < 0)
510 ✗ return ret;
511
512 2 s->dsp.lpc33(decoded, residual, coeffs, pred_order, qlevel, s->blocksize);
513
514 2 return 0;
515 }
516
517 16397 static inline int decode_subframe(FLACContext *s, int channel)
518 {
519 16397 int32_t *decoded = s->decoded[channel];
520 16397 int type, wasted = 0;
521 16397 int bps = s->stream_info.bps;
522 int i, ret;
523
524
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 16397 if (channel == 0) {
525
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 6121 if (s->ch_mode == FLAC_CHMODE_RIGHT_SIDE)
526 642 bps++;
527 } else {
528
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 10276 if (s->ch_mode == FLAC_CHMODE_LEFT_SIDE || s->ch_mode == FLAC_CHMODE_MID_SIDE)
529 2566 bps++;
530 }
531
532
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 16397 if (get_bits1(&s->gb)) {
533 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid subframe padding\n");
534 ✗ return AVERROR_INVALIDDATA;
535 }
536 16397 type = get_bits(&s->gb, 6);
537
538
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 16397 if (get_bits1(&s->gb)) {
539 5246 int left = get_bits_left(&s->gb);
540
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 5246 if ( left <= 0 ||
541
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 5246 (left < bps && !show_bits_long(&s->gb, left)) ||
542 5246 !show_bits_long(&s->gb, bps-1)) {
543 ✗ av_log(s->avctx, AV_LOG_ERROR,
544 "Invalid number of wasted bits > available bits (%d) - left=%d\n",
545 bps, left);
546 ✗ return AVERROR_INVALIDDATA;
547 }
548 5246 wasted = 1 + get_unary(&s->gb, 1, get_bits_left(&s->gb));
549 5246 bps -= wasted;
550 }
551
552 //FIXME use av_log2 for types
553
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 16397 if (type == 0) {
554
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 5851 if (bps < 33) {
555 5851 int32_t tmp = get_sbits_long(&s->gb, bps);
556
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 36045019 for (i = 0; i < s->blocksize; i++)
557 36039168 decoded[i] = tmp;
558 } else {
559 ✗ int64_t tmp = get_sbits64(&s->gb, 33);
560 ✗ for (i = 0; i < s->blocksize; i++)
561 ✗ s->decoded_33bps[i] = tmp;
562 }
563
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 10546 } else if (type == 1) {
564
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 1 if (bps < 33) {
565 ✗ for (i = 0; i < s->blocksize; i++)
566 ✗ decoded[i] = get_sbits_long(&s->gb, bps);
567 } else {
568
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 4609 for (i = 0; i < s->blocksize; i++)
569 4608 s->decoded_33bps[i] = get_sbits64(&s->gb, 33);
570 }
571
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 11480 } else if ((type >= 8) && (type <= 12)) {
572 935 int order = type & ~0x8;
573
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 935 if (bps < 33) {
574
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 935 if (bps + order <= 32) {
575
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 935 if ((ret = decode_subframe_fixed(s, decoded, order, bps)) < 0)
576 ✗ return ret;
577 } else {
578 ✗ if ((ret = decode_subframe_fixed_wide(s, decoded, order, bps)) < 0)
579 ✗ return ret;
580 }
581 } else {
582 ✗ if ((ret = decode_subframe_fixed_33bps(s, s->decoded_33bps, decoded, order)) < 0)
583 ✗ return ret;
584 }
585
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 9610 } else if (type >= 32) {
586
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 9610 if (bps < 33) {
587
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 9608 if ((ret = decode_subframe_lpc(s, decoded, (type & ~0x20)+1, bps)) < 0)
588 1 return ret;
589 } else {
590
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 2 if ((ret = decode_subframe_lpc_33bps(s, s->decoded_33bps, decoded, (type & ~0x20)+1)) < 0)
591 ✗ return ret;
592 }
593 } else {
594 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid coding type\n");
595 ✗ return AVERROR_INVALIDDATA;
596 }
597
598
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 16396 if (wasted) {
599
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 5246 if (wasted+bps == 33) {
600 6 s->dsp.wasted33(s->decoded_33bps, decoded, wasted, s->blocksize);
601
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 5240 } else if (wasted < 32) {
602 5240 s->dsp.wasted32(decoded, wasted, s->blocksize);
603 }
604 }
605
606 16396 return 0;
607 }
608
609 6121 static int decode_frame(FLACContext *s)
610 {
611 int i, ret;
612 6121 GetBitContext *gb = &s->gb;
613 FLACFrameInfo fi;
614
615
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 6121 if ((ret = ff_flac_decode_frame_header(s->avctx, gb, &fi, 0)) < 0) {
616 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid frame header\n");
617 ✗ return ret;
618 }
619
620
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 6121 if ( s->stream_info.channels
621
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 6105 && fi.channels != s->stream_info.channels
622 ✗ && s->got_streaminfo) {
623 ✗ s->stream_info.channels = fi.channels;
624 ✗ ff_flac_set_channel_layout(s->avctx, fi.channels);
625 ✗ ret = allocate_buffers(s);
626 ✗ if (ret < 0)
627 ✗ return ret;
628 }
629 6121 s->stream_info.channels = fi.channels;
630 6121 ff_flac_set_channel_layout(s->avctx, fi.channels);
631 6121 s->ch_mode = fi.ch_mode;
632
633
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 6121 if (!s->stream_info.bps && !fi.bps) {
634 ✗ av_log(s->avctx, AV_LOG_ERROR, "bps not found in STREAMINFO or frame header\n");
635 ✗ return AVERROR_INVALIDDATA;
636 }
637
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 6121 if (!fi.bps) {
638 ✗ fi.bps = s->stream_info.bps;
639
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 6121 } else if (s->stream_info.bps && fi.bps != s->stream_info.bps) {
640 ✗ av_log(s->avctx, AV_LOG_ERROR, "switching bps mid-stream is not "
641 "supported\n");
642 ✗ return AVERROR_INVALIDDATA;
643 }
644
645
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 6121 if (!s->stream_info.bps) {
646 16 s->stream_info.bps = s->avctx->bits_per_raw_sample = fi.bps;
647 16 flac_set_bps(s);
648 }
649
650
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 6121 if (!s->stream_info.max_blocksize)
651 16 s->stream_info.max_blocksize = FLAC_MAX_BLOCKSIZE;
652
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 6121 if (fi.blocksize > s->stream_info.max_blocksize) {
653 ✗ av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", fi.blocksize,
654 s->stream_info.max_blocksize);
655 ✗ return AVERROR_INVALIDDATA;
656 }
657 6121 s->blocksize = fi.blocksize;
658
659
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 6121 if (!s->stream_info.samplerate && !fi.samplerate) {
660 ✗ av_log(s->avctx, AV_LOG_ERROR, "sample rate not found in STREAMINFO"
661 " or frame header\n");
662 ✗ return AVERROR_INVALIDDATA;
663 }
664
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 6121 if (fi.samplerate == 0)
665 ✗ fi.samplerate = s->stream_info.samplerate;
666 6121 s->stream_info.samplerate = s->avctx->sample_rate = fi.samplerate;
667
668
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 6121 if (!s->got_streaminfo) {
669 16 ret = allocate_buffers(s);
670
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 16 if (ret < 0)
671 ✗ return ret;
672 16 s->got_streaminfo = 1;
673 16 dump_headers(s->avctx, &s->stream_info);
674 }
675 6121 ff_flacdsp_init(&s->dsp, s->avctx->sample_fmt,
676 s->stream_info.channels);
677
678 // dump_headers(s->avctx, &s->stream_info);
679
680 /* subframes */
681
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 22517 for (i = 0; i < s->stream_info.channels; i++) {
682
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 16397 if ((ret = decode_subframe(s, i)) < 0)
683 1 return ret;
684 }
685
686 6120 align_get_bits(gb);
687
688 /* frame footer */
689 6120 skip_bits(gb, 16); /* data crc */
690
691 6120 return 0;
692 }
693
694 9 static void decorrelate_33bps(int ch_mode, int32_t **decoded, int64_t *decoded_33bps, int len)
695 {
696 int i;
697
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 9 if (ch_mode == FLAC_CHMODE_LEFT_SIDE ) {
698 ✗ for (i = 0; i < len; i++)
699 ✗ decoded[1][i] = decoded[0][i] - (uint64_t)decoded_33bps[i];
700
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 9 } else if (ch_mode == FLAC_CHMODE_RIGHT_SIDE ) {
701
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 34925 for (i = 0; i < len; i++)
702 34917 decoded[0][i] = decoded[1][i] + (uint64_t)decoded_33bps[i];
703
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 1 } else if (ch_mode == FLAC_CHMODE_MID_SIDE ) {
704
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 4609 for (i = 0; i < len; i++) {
705 4608 uint64_t a = decoded[0][i];
706 4608 int64_t b = decoded_33bps[i];
707 4608 a -= b >> 1;
708 4608 decoded[0][i] = (a + b);
709 4608 decoded[1][i] = a;
710 }
711 }
712 9 }
713
714 6121 static int flac_decode_frame(AVCodecContext *avctx, AVFrame *frame,
715 int *got_frame_ptr, AVPacket *avpkt)
716 {
717 6121 const uint8_t *buf = avpkt->data;
718 6121 int buf_size = avpkt->size;
719 6121 FLACContext *s = avctx->priv_data;
720 6121 int bytes_read = 0;
721 int ret;
722
723 6121 *got_frame_ptr = 0;
724
725
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 6121 if (buf_size > 5 && !memcmp(buf, "\177FLAC", 5)) {
726 ✗ av_log(s->avctx, AV_LOG_DEBUG, "skipping flac header packet 1\n");
727 ✗ return buf_size;
728 }
729
730
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 6121 if (buf_size > 0 && (*buf & 0x7F) == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
731 ✗ av_log(s->avctx, AV_LOG_DEBUG, "skipping vorbis comment\n");
732 ✗ return buf_size;
733 }
734
735 /* check that there is at least the smallest decodable amount of data.
736 this amount corresponds to the smallest valid FLAC frame possible.
737 FF F8 69 02 00 00 9A 00 00 34 */
738
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 6121 if (buf_size < FLAC_MIN_FRAME_SIZE)
739 ✗ return buf_size;
740
741 /* check for inline header */
742
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 6121 if (AV_RB32(buf) == MKBETAG('f','L','a','C')) {
743 ✗ if (!s->got_streaminfo && (ret = parse_streaminfo(s, buf, buf_size))) {
744 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid header\n");
745 ✗ return ret;
746 }
747 ✗ return get_metadata_size(buf, buf_size);
748 }
749
750 /* decode frame */
751
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 6121 if ((ret = init_get_bits8(&s->gb, buf, buf_size)) < 0)
752 ✗ return ret;
753
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 6121 if ((ret = decode_frame(s)) < 0) {
754 1 av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
755 1 return ret;
756 }
757 6120 bytes_read = get_bits_count(&s->gb)/8;
758
759
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 6120 if ((s->avctx->err_recognition & (AV_EF_CRCCHECK|AV_EF_COMPLIANT)) &&
760 ✗ av_crc(av_crc_get_table(AV_CRC_16_ANSI),
761 0, buf, bytes_read)) {
762 ✗ av_log(s->avctx, AV_LOG_ERROR, "CRC error at PTS %"PRId64"\n", avpkt->pts);
763 ✗ if (s->avctx->err_recognition & AV_EF_EXPLODE)
764 ✗ return AVERROR_INVALIDDATA;
765 }
766
767 /* get output buffer */
768 6120 frame->nb_samples = s->blocksize;
769
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 6120 if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
770 ✗ return ret;
771
772
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 6120 if (s->stream_info.bps == 32 && s->ch_mode > 0) {
773 9 decorrelate_33bps(s->ch_mode, s->decoded, s->decoded_33bps, s->blocksize);
774 9 s->dsp.decorrelate[0](frame->data, s->decoded, s->stream_info.channels,
775 s->blocksize, s->sample_shift);
776 } else {
777 6111 s->dsp.decorrelate[s->ch_mode](frame->data, s->decoded,
778 s->stream_info.channels,
779 s->blocksize, s->sample_shift);
780 }
781
782
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 6120 if (bytes_read > buf_size) {
783 ✗ av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", bytes_read - buf_size);
784 ✗ return AVERROR_INVALIDDATA;
785 }
786
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 6120 if (bytes_read < buf_size) {
787 ✗ av_log(s->avctx, AV_LOG_DEBUG, "underread: %d orig size: %d\n",
788 buf_size - bytes_read, buf_size);
789 }
790
791 6120 *got_frame_ptr = 1;
792
793 6120 return bytes_read;
794 }
795
796 273 static av_cold int flac_decode_close(AVCodecContext *avctx)
797 {
798 273 FLACContext *s = avctx->priv_data;
799
800 273 av_freep(&s->decoded_buffer);
801 273 av_freep(&s->decoded_buffer_33bps);
802
803 273 return 0;
804 }
805
806 static const AVOption options[] = {
807 { "use_buggy_lpc", "emulate old buggy lavc behavior", offsetof(FLACContext, buggy_lpc), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM },
808 { NULL },
809 };
810
811 static const AVClass flac_decoder_class = {
812 .class_name = "FLAC decoder",
813 .item_name = av_default_item_name,
814 .option = options,
815 .version = LIBAVUTIL_VERSION_INT,
816 };
817
818 const FFCodec ff_flac_decoder = {
819 .p.name = "flac",
820 CODEC_LONG_NAME("FLAC (Free Lossless Audio Codec)"),
821 .p.type = AVMEDIA_TYPE_AUDIO,
822 .p.id = AV_CODEC_ID_FLAC,
823 .priv_data_size = sizeof(FLACContext),
824 .init = flac_decode_init,
825 .close = flac_decode_close,
826 FF_CODEC_DECODE_CB(flac_decode_frame),
827 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
828 AV_CODEC_CAP_DR1 |
829 AV_CODEC_CAP_FRAME_THREADS,
830 CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S16P,
831 AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_S32P),
832 .p.priv_class = &flac_decoder_class,
833 };
834