flacdec: Add a check for small buffer size. This ensures reading as
[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 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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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/**
bad5537e 23 * @file libavcodec/flacdec.c
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24 * FLAC (Free Lossless Audio Codec) decoder
25 * @author Alex Beregszaszi
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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
245976da 38#include "libavutil/crc.h"
4f52c312 39#include "avcodec.h"
5b37e2fc 40#include "internal.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 {
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59 FLACSTREAMINFO
60
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61 AVCodecContext *avctx; ///< parent AVCodecContext
62 GetBitContext gb; ///< GetBitContext initialized to start at the current frame
4f52c312 63
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64 int blocksize; ///< number of samples in the current frame
65 int curr_bps; ///< bps for current subframe, adjusted for channel correlation and wasted bits
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66 int sample_shift; ///< shift required to make output samples 16-bit or 32-bit
67 int is32; ///< flag to indicate if output should be 32-bit instead of 16-bit
64cb3765 68 enum decorrelation_type decorrelation; ///< channel decorrelation type in the current frame
7d030358 69 int got_streaminfo; ///< indicates if the STREAMINFO has been read
4f52c312 70
64cb3765 71 int32_t *decoded[MAX_CHANNELS]; ///< decoded samples
ac2570a8 72 uint8_t *bitstream;
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73 unsigned int bitstream_size;
74 unsigned int bitstream_index;
f038fe8b 75 unsigned int allocated_bitstream_size;
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76} FLACContext;
77
cf2baeb3 78static const int sample_rate_table[] =
959e0006
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79{ 0,
80 88200, 176400, 192000,
4f52c312 81 8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
115329f1 82 0, 0, 0, 0 };
4f52c312 83
cf2baeb3 84static const int sample_size_table[] =
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85{ 0, 8, 12, 0, 16, 20, 24, 0 };
86
cf2baeb3 87static const int blocksize_table[] = {
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88 0, 192, 576<<0, 576<<1, 576<<2, 576<<3, 0, 0,
89256<<0, 256<<1, 256<<2, 256<<3, 256<<4, 256<<5, 256<<6, 256<<7
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90};
91
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92static int64_t get_utf8(GetBitContext *gb)
93{
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94 int64_t val;
95 GET_UTF8(val, get_bits(gb, 8), return -1;)
ac2570a8 96 return val;
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97}
98
17c90b9d 99static void allocate_buffers(FLACContext *s);
59c6178a
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100
101int ff_flac_is_extradata_valid(AVCodecContext *avctx,
102 enum FLACExtradataFormat *format,
103 uint8_t **streaminfo_start)
104{
105 if (!avctx->extradata || avctx->extradata_size < FLAC_STREAMINFO_SIZE) {
106 av_log(avctx, AV_LOG_ERROR, "extradata NULL or too small.\n");
107 return 0;
108 }
109 if (AV_RL32(avctx->extradata) != MKTAG('f','L','a','C')) {
110 /* extradata contains STREAMINFO only */
111 if (avctx->extradata_size != FLAC_STREAMINFO_SIZE) {
112 av_log(avctx, AV_LOG_WARNING, "extradata contains %d bytes too many.\n",
113 FLAC_STREAMINFO_SIZE-avctx->extradata_size);
114 }
115 *format = FLAC_EXTRADATA_FORMAT_STREAMINFO;
116 *streaminfo_start = avctx->extradata;
117 } else {
118 if (avctx->extradata_size < 8+FLAC_STREAMINFO_SIZE) {
119 av_log(avctx, AV_LOG_ERROR, "extradata too small.\n");
120 return 0;
121 }
122 *format = FLAC_EXTRADATA_FORMAT_FULL_HEADER;
123 *streaminfo_start = &avctx->extradata[8];
124 }
125 return 1;
126}
9eda2f94 127
1bec121f 128static av_cold int flac_decode_init(AVCodecContext *avctx)
4f52c312 129{
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130 enum FLACExtradataFormat format;
131 uint8_t *streaminfo;
9eda2f94
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132 FLACContext *s = avctx->priv_data;
133 s->avctx = avctx;
134
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135 avctx->sample_fmt = SAMPLE_FMT_S16;
136
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137 /* for now, the raw FLAC header is allowed to be passed to the decoder as
138 frame data instead of extradata. */
139 if (!avctx->extradata)
140 return 0;
141
142 if (!ff_flac_is_extradata_valid(avctx, &format, &streaminfo))
143 return -1;
144
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JR
145 /* initialize based on the demuxer-supplied streamdata header */
146 ff_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, streaminfo);
147 allocate_buffers(s);
7d030358 148 s->got_streaminfo = 1;
9eda2f94 149
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150 return 0;
151}
152
9482171b 153static void dump_headers(AVCodecContext *avctx, FLACStreaminfo *s)
4f52c312 154{
95db6659 155 av_log(avctx, AV_LOG_DEBUG, " Max Blocksize: %d\n", s->max_blocksize);
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156 av_log(avctx, AV_LOG_DEBUG, " Max Framesize: %d\n", s->max_framesize);
157 av_log(avctx, AV_LOG_DEBUG, " Samplerate: %d\n", s->samplerate);
158 av_log(avctx, AV_LOG_DEBUG, " Channels: %d\n", s->channels);
159 av_log(avctx, AV_LOG_DEBUG, " Bits: %d\n", s->bps);
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160}
161
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162static void allocate_buffers(FLACContext *s)
163{
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164 int i;
165
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166 assert(s->max_blocksize);
167
1bec121f 168 if (s->max_framesize == 0 && s->max_blocksize) {
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169 // FIXME header overhead
170 s->max_framesize= (s->channels * s->bps * s->max_blocksize + 7)/ 8;
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171 }
172
1bec121f 173 for (i = 0; i < s->channels; i++) {
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174 s->decoded[i] = av_realloc(s->decoded[i],
175 sizeof(int32_t)*s->max_blocksize);
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176 }
177
1bec121f 178 if (s->allocated_bitstream_size < s->max_framesize)
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179 s->bitstream= av_fast_realloc(s->bitstream,
180 &s->allocated_bitstream_size,
181 s->max_framesize);
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182}
183
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184void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
185 const uint8_t *buffer)
ac2570a8 186{
a128cc91
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187 GetBitContext gb;
188 init_get_bits(&gb, buffer, FLAC_STREAMINFO_SIZE*8);
189
95db6659 190 skip_bits(&gb, 16); /* skip min blocksize */
a128cc91 191 s->max_blocksize = get_bits(&gb, 16);
2e78513c
JR
192 if (s->max_blocksize < 16) {
193 av_log(avctx, AV_LOG_WARNING, "invalid max blocksize: %d\n",
194 s->max_blocksize);
195 s->max_blocksize = 16;
196 }
4f52c312 197
a128cc91
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198 skip_bits(&gb, 24); /* skip min frame size */
199 s->max_framesize = get_bits_long(&gb, 24);
115329f1 200
a128cc91
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201 s->samplerate = get_bits_long(&gb, 20);
202 s->channels = get_bits(&gb, 3) + 1;
203 s->bps = get_bits(&gb, 5) + 1;
115329f1 204
a128cc91
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205 avctx->channels = s->channels;
206 avctx->sample_rate = s->samplerate;
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207 avctx->bits_per_raw_sample = s->bps;
208 if (s->bps > 16)
209 avctx->sample_fmt = SAMPLE_FMT_S32;
210 else
211 avctx->sample_fmt = SAMPLE_FMT_S16;
4f52c312 212
aeb987ce 213 s->samples = get_bits_long(&gb, 32) << 4;
ee4d0322 214 s->samples |= get_bits(&gb, 4);
115329f1 215
ee4d0322
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216 skip_bits_long(&gb, 64); /* md5 sum */
217 skip_bits_long(&gb, 64); /* md5 sum */
115329f1 218
4bc07e78 219 dump_headers(avctx, s);
17c90b9d
AJ
220}
221
222/**
223 * Parse a list of metadata blocks. This list of blocks must begin with
224 * the fLaC marker.
225 * @param s the flac decoding context containing the gb bit reader used to
226 * parse metadata
55a72738 227 * @return non-zero if metadata is invalid
17c90b9d
AJ
228 */
229static int metadata_parse(FLACContext *s)
230{
7d030358 231 int i, metadata_last, metadata_type, metadata_size;
17c90b9d 232
6a85fb34 233 skip_bits_long(&s->gb, 32);
17c90b9d 234
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JR
235 do {
236 metadata_last = get_bits1(&s->gb);
237 metadata_type = get_bits(&s->gb, 7);
238 metadata_size = get_bits_long(&s->gb, 24);
17c90b9d 239
6a85fb34 240 if (get_bits_count(&s->gb) + 8*metadata_size > s->gb.size_in_bits) {
e1374c06
JR
241 /* need more data. reset the bitstream reader and return. */
242 init_get_bits(&s->gb, s->gb.buffer, s->gb.size_in_bits);
6a85fb34
JR
243 break;
244 }
e0168e3b 245
6a85fb34
JR
246 if (metadata_size) {
247 switch (metadata_type) {
248 case FLAC_METADATA_TYPE_STREAMINFO:
249 if (!s->got_streaminfo) {
250 ff_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s,
251 s->gb.buffer+get_bits_count(&s->gb)/8);
252 allocate_buffers(s);
253 s->got_streaminfo = 1;
17c90b9d 254 }
6a85fb34
JR
255 default:
256 for (i = 0; i < metadata_size; i++)
257 skip_bits(&s->gb, 8);
17c90b9d 258 }
6a85fb34
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259 }
260 } while (!metadata_last);
17c90b9d 261
17c90b9d 262 return 0;
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263}
264
265static int decode_residuals(FLACContext *s, int channel, int pred_order)
266{
267 int i, tmp, partition, method_type, rice_order;
268 int sample = 0, samples;
269
270 method_type = get_bits(&s->gb, 2);
1bec121f 271 if (method_type > 1) {
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JR
272 av_log(s->avctx, AV_LOG_ERROR, "illegal residual coding method %d\n",
273 method_type);
4f52c312 274 return -1;
ac2570a8 275 }
115329f1 276
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277 rice_order = get_bits(&s->gb, 4);
278
ac2570a8 279 samples= s->blocksize >> rice_order;
5484dad7 280 if (pred_order > samples) {
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281 av_log(s->avctx, AV_LOG_ERROR, "invalid predictor order: %i > %i\n",
282 pred_order, samples);
5484dad7
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283 return -1;
284 }
4f52c312 285
115329f1 286 sample=
ac2570a8 287 i= pred_order;
1bec121f 288 for (partition = 0; partition < (1 << rice_order); partition++) {
e471443a 289 tmp = get_bits(&s->gb, method_type == 0 ? 4 : 5);
1bec121f 290 if (tmp == (method_type == 0 ? 15 : 31)) {
4f52c312 291 tmp = get_bits(&s->gb, 5);
4f52c312 292 for (; i < samples; i++, sample++)
9de6e090 293 s->decoded[channel][sample] = get_sbits_long(&s->gb, tmp);
1bec121f
JR
294 } else {
295 for (; i < samples; i++, sample++) {
4fd12598 296 s->decoded[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
ac2570a8 297 }
4f52c312 298 }
ac2570a8 299 i= 0;
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300 }
301
4f52c312 302 return 0;
115329f1 303}
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304
305static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order)
306{
08965b22
LM
307 const int blocksize = s->blocksize;
308 int32_t *decoded = s->decoded[channel];
7846418b 309 int av_uninit(a), av_uninit(b), av_uninit(c), av_uninit(d), i;
115329f1 310
4f52c312 311 /* warm up samples */
1bec121f 312 for (i = 0; i < pred_order; i++) {
9de6e090 313 decoded[i] = get_sbits_long(&s->gb, s->curr_bps);
4f52c312 314 }
115329f1 315
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316 if (decode_residuals(s, channel, pred_order) < 0)
317 return -1;
318
1bec121f 319 if (pred_order > 0)
1f4fa6a4 320 a = decoded[pred_order-1];
1bec121f 321 if (pred_order > 1)
1f4fa6a4 322 b = a - decoded[pred_order-2];
1bec121f 323 if (pred_order > 2)
1f4fa6a4 324 c = b - decoded[pred_order-2] + decoded[pred_order-3];
1bec121f 325 if (pred_order > 3)
1f4fa6a4 326 d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
08965b22 327
1bec121f
JR
328 switch (pred_order) {
329 case 0:
330 break;
331 case 1:
332 for (i = pred_order; i < blocksize; i++)
333 decoded[i] = a += decoded[i];
334 break;
335 case 2:
336 for (i = pred_order; i < blocksize; i++)
337 decoded[i] = a += b += decoded[i];
338 break;
339 case 3:
340 for (i = pred_order; i < blocksize; i++)
341 decoded[i] = a += b += c += decoded[i];
342 break;
343 case 4:
344 for (i = pred_order; i < blocksize; i++)
345 decoded[i] = a += b += c += d += decoded[i];
346 break;
347 default:
348 av_log(s->avctx, AV_LOG_ERROR, "illegal pred order %d\n", pred_order);
349 return -1;
4f52c312 350 }
ac2570a8 351
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352 return 0;
353}
354
355static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order)
356{
0187178e 357 int i, j;
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MN
358 int coeff_prec, qlevel;
359 int coeffs[pred_order];
d1a5c421 360 int32_t *decoded = s->decoded[channel];
115329f1 361
4f52c312 362 /* warm up samples */
1bec121f 363 for (i = 0; i < pred_order; i++) {
9de6e090 364 decoded[i] = get_sbits_long(&s->gb, s->curr_bps);
4f52c312 365 }
115329f1 366
4f52c312 367 coeff_prec = get_bits(&s->gb, 4) + 1;
1bec121f 368 if (coeff_prec == 16) {
5305f40b 369 av_log(s->avctx, AV_LOG_ERROR, "invalid coeff precision\n");
4f52c312
MN
370 return -1;
371 }
ac2570a8 372 qlevel = get_sbits(&s->gb, 5);
1bec121f 373 if (qlevel < 0) {
9f3d3ecf
JR
374 av_log(s->avctx, AV_LOG_ERROR, "qlevel %d not supported, maybe buggy stream\n",
375 qlevel);
9d656110
MN
376 return -1;
377 }
378
1bec121f 379 for (i = 0; i < pred_order; i++) {
ac2570a8 380 coeffs[i] = get_sbits(&s->gb, coeff_prec);
4f52c312 381 }
115329f1 382
4f52c312
MN
383 if (decode_residuals(s, channel, pred_order) < 0)
384 return -1;
385
0187178e
LB
386 if (s->bps > 16) {
387 int64_t sum;
1bec121f 388 for (i = pred_order; i < s->blocksize; i++) {
0187178e
LB
389 sum = 0;
390 for (j = 0; j < pred_order; j++)
d1a5c421
LM
391 sum += (int64_t)coeffs[j] * decoded[i-j-1];
392 decoded[i] += sum >> qlevel;
0187178e
LB
393 }
394 } else {
1bec121f 395 for (i = pred_order; i < s->blocksize-1; i += 2) {
d1a5c421
LM
396 int c;
397 int d = decoded[i-pred_order];
398 int s0 = 0, s1 = 0;
1bec121f 399 for (j = pred_order-1; j > 0; j--) {
d1a5c421 400 c = coeffs[j];
bd49d4fd 401 s0 += c*d;
d1a5c421
LM
402 d = decoded[i-j];
403 s1 += c*d;
bd49d4fd 404 }
d1a5c421
LM
405 c = coeffs[0];
406 s0 += c*d;
407 d = decoded[i] += s0 >> qlevel;
408 s1 += c*d;
409 decoded[i+1] += s1 >> qlevel;
bd49d4fd 410 }
1bec121f 411 if (i < s->blocksize) {
bd49d4fd 412 int sum = 0;
0187178e 413 for (j = 0; j < pred_order; j++)
d1a5c421
LM
414 sum += coeffs[j] * decoded[i-j-1];
415 decoded[i] += sum >> qlevel;
0187178e 416 }
4f52c312 417 }
115329f1 418
4f52c312
MN
419 return 0;
420}
421
422static inline int decode_subframe(FLACContext *s, int channel)
423{
424 int type, wasted = 0;
425 int i, tmp;
115329f1 426
4f52c312 427 s->curr_bps = s->bps;
1bec121f
JR
428 if (channel == 0) {
429 if (s->decorrelation == RIGHT_SIDE)
ac2570a8 430 s->curr_bps++;
1bec121f
JR
431 } else {
432 if (s->decorrelation == LEFT_SIDE || s->decorrelation == MID_SIDE)
ac2570a8
MN
433 s->curr_bps++;
434 }
435
1bec121f 436 if (get_bits1(&s->gb)) {
1cef211d 437 av_log(s->avctx, AV_LOG_ERROR, "invalid subframe padding\n");
4f52c312
MN
438 return -1;
439 }
440 type = get_bits(&s->gb, 6);
c5706efd 441
1bec121f 442 if (get_bits1(&s->gb)) {
4f52c312
MN
443 wasted = 1;
444 while (!get_bits1(&s->gb))
445 wasted++;
446 s->curr_bps -= wasted;
447 }
a3d2379b
JR
448 if (s->curr_bps > 32) {
449 ff_log_missing_feature(s->avctx, "decorrelated bit depth > 32", 0);
450 return -1;
451 }
c5706efd 452
ac2570a8 453//FIXME use av_log2 for types
1bec121f 454 if (type == 0) {
9de6e090 455 tmp = get_sbits_long(&s->gb, s->curr_bps);
4f52c312
MN
456 for (i = 0; i < s->blocksize; i++)
457 s->decoded[channel][i] = tmp;
1bec121f 458 } else if (type == 1) {
4f52c312 459 for (i = 0; i < s->blocksize; i++)
9de6e090 460 s->decoded[channel][i] = get_sbits_long(&s->gb, s->curr_bps);
1bec121f 461 } else if ((type >= 8) && (type <= 12)) {
4f52c312
MN
462 if (decode_subframe_fixed(s, channel, type & ~0x8) < 0)
463 return -1;
1bec121f 464 } else if (type >= 32) {
4f52c312
MN
465 if (decode_subframe_lpc(s, channel, (type & ~0x20)+1) < 0)
466 return -1;
1bec121f 467 } else {
1cef211d 468 av_log(s->avctx, AV_LOG_ERROR, "invalid coding type\n");
4f52c312
MN
469 return -1;
470 }
115329f1 471
1bec121f 472 if (wasted) {
4f52c312
MN
473 int i;
474 for (i = 0; i < s->blocksize; i++)
475 s->decoded[channel][i] <<= wasted;
476 }
477
478 return 0;
479}
480
ac66834c 481static int decode_frame(FLACContext *s, int alloc_data_size)
4f52c312 482{
9d656110 483 int blocksize_code, sample_rate_code, sample_size_code, assignment, i, crc8;
0496a034 484 int decorrelation, bps, blocksize, samplerate;
115329f1 485
4f52c312 486 blocksize_code = get_bits(&s->gb, 4);
4f52c312
MN
487
488 sample_rate_code = get_bits(&s->gb, 4);
115329f1 489
4f52c312 490 assignment = get_bits(&s->gb, 4); /* channel assignment */
0496a034
MN
491 if (assignment < 8 && s->channels == assignment+1)
492 decorrelation = INDEPENDENT;
493 else if (assignment >=8 && assignment < 11 && s->channels == 2)
494 decorrelation = LEFT_SIDE + assignment - 8;
1bec121f 495 else {
9f3d3ecf
JR
496 av_log(s->avctx, AV_LOG_ERROR, "unsupported channel assignment %d (channels=%d)\n",
497 assignment, s->channels);
4f52c312
MN
498 return -1;
499 }
115329f1 500
4f52c312 501 sample_size_code = get_bits(&s->gb, 3);
1bec121f 502 if (sample_size_code == 0)
0496a034 503 bps= s->bps;
1bec121f 504 else if ((sample_size_code != 3) && (sample_size_code != 7))
0496a034 505 bps = sample_size_table[sample_size_code];
1bec121f 506 else {
9f3d3ecf
JR
507 av_log(s->avctx, AV_LOG_ERROR, "invalid sample size code (%d)\n",
508 sample_size_code);
4f52c312
MN
509 return -1;
510 }
82159ad9
JR
511 if (bps > 16) {
512 s->avctx->sample_fmt = SAMPLE_FMT_S32;
513 s->sample_shift = 32 - bps;
514 s->is32 = 1;
515 } else {
516 s->avctx->sample_fmt = SAMPLE_FMT_S16;
517 s->sample_shift = 16 - bps;
518 s->is32 = 0;
519 }
520 s->bps = s->avctx->bits_per_raw_sample = bps;
4f52c312 521
1bec121f 522 if (get_bits1(&s->gb)) {
1cef211d 523 av_log(s->avctx, AV_LOG_ERROR, "broken stream, invalid padding\n");
0496a034 524 return -1;
4f52c312 525 }
115329f1 526
1bec121f 527 if (get_utf8(&s->gb) < 0) {
0496a034
MN
528 av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
529 return -1;
530 }
115329f1 531
dde318d5
JR
532 if (blocksize_code == 0) {
533 av_log(s->avctx, AV_LOG_ERROR, "reserved blocksize code: 0\n");
534 return -1;
535 } else if (blocksize_code == 6)
0496a034 536 blocksize = get_bits(&s->gb, 8)+1;
ac2570a8 537 else if (blocksize_code == 7)
0496a034 538 blocksize = get_bits(&s->gb, 16)+1;
115329f1 539 else
0496a034 540 blocksize = blocksize_table[blocksize_code];
4f52c312 541
1bec121f 542 if (blocksize > s->max_blocksize) {
9f3d3ecf
JR
543 av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", blocksize,
544 s->max_blocksize);
ac2570a8
MN
545 return -1;
546 }
547
549bccdb 548 if (blocksize * s->channels * (s->is32 ? 4 : 2) > alloc_data_size)
ac66834c
MN
549 return -1;
550
1bec121f 551 if (sample_rate_code == 0)
0496a034 552 samplerate= s->samplerate;
1bec121f 553 else if (sample_rate_code < 12)
0496a034 554 samplerate = sample_rate_table[sample_rate_code];
ac2570a8 555 else if (sample_rate_code == 12)
0496a034 556 samplerate = get_bits(&s->gb, 8) * 1000;
ac2570a8 557 else if (sample_rate_code == 13)
0496a034 558 samplerate = get_bits(&s->gb, 16);
ac2570a8 559 else if (sample_rate_code == 14)
0496a034 560 samplerate = get_bits(&s->gb, 16) * 10;
1bec121f 561 else {
9f3d3ecf
JR
562 av_log(s->avctx, AV_LOG_ERROR, "illegal sample rate code %d\n",
563 sample_rate_code);
ac2570a8 564 return -1;
4f52c312
MN
565 }
566
9d656110 567 skip_bits(&s->gb, 8);
3abe5fbd
AJ
568 crc8 = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0,
569 s->gb.buffer, get_bits_count(&s->gb)/8);
1bec121f 570 if (crc8) {
160d679c 571 av_log(s->avctx, AV_LOG_ERROR, "header crc mismatch crc=%2X\n", crc8);
9d656110
MN
572 return -1;
573 }
115329f1 574
0496a034
MN
575 s->blocksize = blocksize;
576 s->samplerate = samplerate;
577 s->bps = bps;
578 s->decorrelation= decorrelation;
4f52c312 579
9482171b 580// dump_headers(s->avctx, (FLACStreaminfo *)s);
4f52c312
MN
581
582 /* subframes */
1bec121f 583 for (i = 0; i < s->channels; i++) {
4f52c312
MN
584 if (decode_subframe(s, i) < 0)
585 return -1;
586 }
115329f1 587
4f52c312
MN
588 align_get_bits(&s->gb);
589
590 /* frame footer */
591 skip_bits(&s->gb, 16); /* data crc */
592
593 return 0;
594}
595
596static int flac_decode_frame(AVCodecContext *avctx,
597 void *data, int *data_size,
1545c5e5 598 const uint8_t *buf, int buf_size)
4f52c312
MN
599{
600 FLACContext *s = avctx->priv_data;
c5199729 601 int tmp = 0, i, j = 0, input_buf_size = 0, bytes_read = 0;
82159ad9
JR
602 int16_t *samples_16 = data;
603 int32_t *samples_32 = data;
ac66834c
MN
604 int alloc_data_size= *data_size;
605
606 *data_size=0;
4f52c312 607
1bec121f 608 if (s->max_framesize == 0) {
d3ce0792 609 s->max_framesize= FFMAX(4, buf_size); // should hopefully be enough for the first header
ac2570a8
MN
610 s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
611 }
612
1bec121f 613 if (1 && s->max_framesize) { //FIXME truncated
1df0390e
JR
614 if (s->bitstream_size < 4 || AV_RL32(s->bitstream) != MKTAG('f','L','a','C'))
615 buf_size= FFMIN(buf_size, s->max_framesize - FFMIN(s->bitstream_size, s->max_framesize));
616 input_buf_size= buf_size;
ac2570a8 617
1df0390e
JR
618 if (s->bitstream_size + buf_size < buf_size || s->bitstream_index + s->bitstream_size + buf_size < s->bitstream_index)
619 return -1;
e0168e3b 620
1df0390e
JR
621 if (s->allocated_bitstream_size < s->bitstream_size + buf_size)
622 s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->bitstream_size + buf_size);
e0168e3b 623
1df0390e 624 if (s->bitstream_index + s->bitstream_size + buf_size > s->allocated_bitstream_size) {
9f3d3ecf
JR
625 memmove(s->bitstream, &s->bitstream[s->bitstream_index],
626 s->bitstream_size);
1df0390e
JR
627 s->bitstream_index=0;
628 }
9f3d3ecf
JR
629 memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size],
630 buf, buf_size);
1df0390e
JR
631 buf= &s->bitstream[s->bitstream_index];
632 buf_size += s->bitstream_size;
633 s->bitstream_size= buf_size;
115329f1 634
1df0390e
JR
635 if (buf_size < s->max_framesize && input_buf_size) {
636 return input_buf_size;
637 }
ac2570a8 638 }
4f52c312
MN
639
640 init_get_bits(&s->gb, buf, buf_size*8);
115329f1 641
5ef4fa87
JR
642 /* check that there is at least the smallest decodable amount of data.
643 this amount corresponds to the smallest valid FLAC frame possible. */
644 if (buf_size < 24)
645 goto end;
646
55a72738
JR
647 /* check for inline header */
648 if (show_bits_long(&s->gb, 32) == MKBETAG('f','L','a','C')) {
649 if (metadata_parse(s)) {
650 av_log(s->avctx, AV_LOG_ERROR, "invalid header\n");
651 return -1;
652 }
2b4b8c82 653 goto end;
55a72738 654 }
2b4b8c82 655
13de8a08 656 tmp = show_bits(&s->gb, 16);
1bec121f 657 if ((tmp & 0xFFFE) != 0xFFF8) {
13de8a08 658 av_log(s->avctx, AV_LOG_ERROR, "FRAME HEADER not here\n");
1bec121f 659 while (get_bits_count(&s->gb)/8+2 < buf_size && (show_bits(&s->gb, 16) & 0xFFFE) != 0xFFF8)
13de8a08
JR
660 skip_bits(&s->gb, 8);
661 goto end; // we may not have enough bits left to decode a frame, so try next time
662 }
663 skip_bits(&s->gb, 16);
1bec121f 664 if (decode_frame(s, alloc_data_size) < 0) {
13de8a08
JR
665 av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
666 s->bitstream_size=0;
667 s->bitstream_index=0;
668 return -1;
669 }
ac2570a8 670
c448303d
MN
671#define DECORRELATE(left, right)\
672 assert(s->channels == 2);\
1bec121f 673 for (i = 0; i < s->blocksize; i++) {\
c448303d
MN
674 int a= s->decoded[0][i];\
675 int b= s->decoded[1][i];\
82159ad9
JR
676 if (s->is32) {\
677 *samples_32++ = (left) << s->sample_shift;\
678 *samples_32++ = (right) << s->sample_shift;\
679 } else {\
680 *samples_16++ = (left) << s->sample_shift;\
681 *samples_16++ = (right) << s->sample_shift;\
682 }\
c448303d
MN
683 }\
684 break;
685
1bec121f
JR
686 switch (s->decorrelation) {
687 case INDEPENDENT:
688 for (j = 0; j < s->blocksize; j++) {
82159ad9
JR
689 for (i = 0; i < s->channels; i++) {
690 if (s->is32)
691 *samples_32++ = s->decoded[i][j] << s->sample_shift;
692 else
693 *samples_16++ = s->decoded[i][j] << s->sample_shift;
694 }
1bec121f
JR
695 }
696 break;
697 case LEFT_SIDE:
698 DECORRELATE(a,a-b)
699 case RIGHT_SIDE:
700 DECORRELATE(a+b,b)
701 case MID_SIDE:
702 DECORRELATE( (a-=b>>1) + b, a)
4f52c312 703 }
4f52c312 704
82159ad9 705 *data_size = s->blocksize * s->channels * (s->is32 ? 4 : 2);
4f52c312 706
ac2570a8 707end:
c5199729
JR
708 bytes_read = (get_bits_count(&s->gb)+7)/8;
709 if (bytes_read > buf_size) {
710 av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", bytes_read - buf_size);
9d656110
MN
711 s->bitstream_size=0;
712 s->bitstream_index=0;
ac2570a8
MN
713 return -1;
714 }
4f52c312 715
1bec121f 716 if (s->bitstream_size) {
c5199729
JR
717 s->bitstream_index += bytes_read;
718 s->bitstream_size -= bytes_read;
ac2570a8 719 return input_buf_size;
1bec121f 720 } else
c5199729 721 return bytes_read;
4f52c312
MN
722}
723
98a6fff9 724static av_cold int flac_decode_close(AVCodecContext *avctx)
4f52c312
MN
725{
726 FLACContext *s = avctx->priv_data;
727 int i;
115329f1 728
1bec121f 729 for (i = 0; i < s->channels; i++) {
ac2570a8 730 av_freep(&s->decoded[i]);
4f52c312 731 }
ac2570a8 732 av_freep(&s->bitstream);
115329f1 733
4f52c312
MN
734 return 0;
735}
736
1bec121f
JR
737static void flac_flush(AVCodecContext *avctx)
738{
1e31d32c
MN
739 FLACContext *s = avctx->priv_data;
740
741 s->bitstream_size=
742 s->bitstream_index= 0;
743}
744
4f52c312
MN
745AVCodec flac_decoder = {
746 "flac",
747 CODEC_TYPE_AUDIO,
748 CODEC_ID_FLAC,
749 sizeof(FLACContext),
750 flac_decode_init,
751 NULL,
752 flac_decode_close,
753 flac_decode_frame,
4c453ddb 754 CODEC_CAP_DELAY,
115329f1 755 .flush= flac_flush,
fe4bf374 756 .long_name= NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
4f52c312 757};