FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/flacdec.c
Date: 2025-03-08 20:38:41
Exec Total Coverage
Lines: 138 206 67.0%
Functions: 7 7 100.0%
Branches: 70 132 53.0%
Line Branch Exec Source
1 /*
2 * Raw FLAC demuxer
3 * Copyright (c) 2001 Fabrice Bellard
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 #include "libavutil/channel_layout.h"
23 #include "libavutil/mem.h"
24 #include "libavcodec/avcodec.h"
25 #include "libavcodec/bytestream.h"
26 #include "libavcodec/flac.h"
27 #include "avformat.h"
28 #include "demux.h"
29 #include "flac_picture.h"
30 #include "internal.h"
31 #include "rawdec.h"
32 #include "oggdec.h"
33 #include "replaygain.h"
34
35 #define SEEKPOINT_SIZE 18
36
37 typedef struct FLACDecContext {
38 FFRawDemuxerContext rawctx;
39 int found_seektable;
40
41 AVCodecContext *parser_dec;
42 } FLACDecContext;
43
44 32 static void reset_index_position(int64_t metadata_head_size, AVStream *st)
45 {
46 32 FFStream *const sti = ffstream(st);
47 /* the real seek index offset should be the size of metadata blocks with the offset in the frame blocks */
48
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 32 for (int i = 0; i < sti->nb_index_entries; i++)
49 ✗ sti->index_entries[i].pos += metadata_head_size;
50 32 }
51
52 static const uint16_t sr_table[16] = {
53 0, 1764, 3528, 3840, 160, 320, 441, 480, 640, 882, 960, 1920, 0, 0, 0, 0
54 };
55
56 32 static int flac_read_header(AVFormatContext *s)
57 {
58 32 int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
59 uint8_t header[4];
60 32 uint8_t *buffer=NULL;
61 uint32_t marker;
62 32 FLACDecContext *flac = s->priv_data;
63 32 AVStream *st = avformat_new_stream(s, NULL);
64
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 32 if (!st)
65 ✗ return AVERROR(ENOMEM);
66 32 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
67 32 st->codecpar->codec_id = AV_CODEC_ID_FLAC;
68 32 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
69 /* the parameters will be extracted from the compressed bitstream */
70
71 /* if fLaC marker is not found, assume there is no header */
72 32 marker = avio_rl32(s->pb);
73
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 32 if (marker != MKTAG('f','L','a','C')) {
74 ✗ const int sample_rate = 50 * sr_table[(marker >> 16) & 0xF];
75 ✗ if (sample_rate)
76 ✗ avpriv_set_pts_info(st, 64, 1, sample_rate);
77 ✗ avio_seek(s->pb, -4, SEEK_CUR);
78 ✗ return 0;
79 }
80
81 /* process metadata blocks */
82
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 149 while (!avio_feof(s->pb) && !metadata_last) {
83 117 ret = avio_read(s->pb, header, 4);
84
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 117 if (ret < 0) {
85 ✗ return ret;
86
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 117 } else if (ret != 4) {
87 ✗ return AVERROR_EOF;
88 }
89
90 117 flac_parse_block_header(header, &metadata_last, &metadata_type,
91 &metadata_size);
92
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 117 switch (metadata_type) {
93 /* allocate and read metadata block for supported types */
94 85 case FLAC_METADATA_TYPE_STREAMINFO:
95 case FLAC_METADATA_TYPE_CUESHEET:
96 case FLAC_METADATA_TYPE_PICTURE:
97 case FLAC_METADATA_TYPE_VORBIS_COMMENT:
98 case FLAC_METADATA_TYPE_SEEKTABLE:
99 85 buffer = av_mallocz(metadata_size + AV_INPUT_BUFFER_PADDING_SIZE);
100
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 85 if (!buffer) {
101 ✗ return AVERROR(ENOMEM);
102 }
103 85 ret = avio_read(s->pb, buffer, metadata_size);
104
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 85 if (ret < 0) {
105 ✗ RETURN_ERROR(ret);
106
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 85 } else if (ret != metadata_size) {
107 ✗ RETURN_ERROR(AVERROR_EOF);
108 }
109 85 break;
110 /* skip metadata block for unsupported types */
111 32 default:
112 32 ret = avio_skip(s->pb, metadata_size);
113
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 32 if (ret < 0)
114 ✗ return ret;
115 }
116
117
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 117 if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
118 uint32_t samplerate;
119 uint64_t samples;
120
121 /* STREAMINFO can only occur once */
122
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 32 if (found_streaminfo) {
123 ✗ RETURN_ERROR(AVERROR_INVALIDDATA);
124 }
125
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 32 if (metadata_size != FLAC_STREAMINFO_SIZE) {
126 ✗ RETURN_ERROR(AVERROR_INVALIDDATA);
127 }
128 32 found_streaminfo = 1;
129 32 st->codecpar->extradata = buffer;
130 32 st->codecpar->extradata_size = metadata_size;
131 32 buffer = NULL;
132
133 /* get sample rate and sample count from STREAMINFO header;
134 * other parameters will be extracted by the parser */
135 32 samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
136 32 samples = (AV_RB64(st->codecpar->extradata + 13) >> 24) & ((1ULL << 36) - 1);
137
138 /* set time base and duration */
139
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 32 if (samplerate > 0) {
140 32 avpriv_set_pts_info(st, 64, 1, samplerate);
141
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 32 if (samples > 0)
142 32 st->duration = samples;
143 }
144
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 85 } else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
145 uint8_t isrc[13];
146 uint64_t start;
147 const uint8_t *offset;
148 int i, chapters, track, ti;
149 ✗ if (metadata_size < 431)
150 ✗ RETURN_ERROR(AVERROR_INVALIDDATA);
151 ✗ offset = buffer + 395;
152 ✗ chapters = bytestream_get_byte(&offset) - 1;
153 ✗ if (chapters <= 0)
154 ✗ RETURN_ERROR(AVERROR_INVALIDDATA);
155 ✗ for (i = 0; i < chapters; i++) {
156 ✗ if (offset + 36 - buffer > metadata_size)
157 ✗ RETURN_ERROR(AVERROR_INVALIDDATA);
158 ✗ start = bytestream_get_be64(&offset);
159 ✗ track = bytestream_get_byte(&offset);
160 ✗ bytestream_get_buffer(&offset, isrc, 12);
161 ✗ isrc[12] = 0;
162 ✗ offset += 14;
163 ✗ ti = bytestream_get_byte(&offset);
164 ✗ if (ti <= 0) RETURN_ERROR(AVERROR_INVALIDDATA);
165 ✗ offset += ti * 12;
166 ✗ avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
167 }
168 ✗ av_freep(&buffer);
169
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 85 } else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
170 13 ret = ff_flac_parse_picture(s, &buffer, metadata_size, 1);
171 13 av_freep(&buffer);
172
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 13 if (ret < 0) {
173 ✗ av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");
174 ✗ return ret;
175 }
176
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 72 } else if (metadata_type == FLAC_METADATA_TYPE_SEEKTABLE) {
177 9 const uint8_t *seekpoint = buffer;
178 9 int i, seek_point_count = metadata_size/SEEKPOINT_SIZE;
179 9 flac->found_seektable = 1;
180
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 9 if ((s->flags&AVFMT_FLAG_FAST_SEEK)) {
181 ✗ for(i=0; i<seek_point_count; i++) {
182 ✗ int64_t timestamp = bytestream_get_be64(&seekpoint);
183 ✗ int64_t pos = bytestream_get_be64(&seekpoint);
184 /* skip number of samples */
185 ✗ bytestream_get_be16(&seekpoint);
186 ✗ av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
187 }
188 }
189 9 av_freep(&buffer);
190 }
191 else {
192
193 /* STREAMINFO must be the first block */
194
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 63 if (!found_streaminfo) {
195 ✗ RETURN_ERROR(AVERROR_INVALIDDATA);
196 }
197 /* process supported blocks other than STREAMINFO */
198
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 63 if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
199 AVDictionaryEntry *chmask;
200
201 31 ret = ff_vorbis_comment(s, &s->metadata, buffer, metadata_size, 1);
202
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 31 if (ret < 0) {
203 ✗ av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
204
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 31 } else if (ret > 0) {
205 19 s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
206 }
207
208 /* parse the channels mask if present */
209 31 chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
210
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 31 if (chmask) {
211 2 uint64_t mask = strtol(chmask->value, NULL, 0);
212
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 2 if (!mask || mask & ~0x3ffffULL) {
213 ✗ av_log(s, AV_LOG_WARNING,
214 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
215 } else {
216 2 av_channel_layout_from_mask(&st->codecpar->ch_layout, mask);
217 2 av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
218 }
219 }
220 }
221 63 av_freep(&buffer);
222 }
223 }
224
225 32 ret = ff_replaygain_export(st, s->metadata);
226
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 32 if (ret < 0)
227 ✗ return ret;
228
229 32 reset_index_position(avio_tell(s->pb), st);
230 32 return 0;
231
232 ✗ fail:
233 ✗ av_free(buffer);
234 ✗ return ret;
235 }
236
237 16 static int raw_flac_probe(const AVProbeData *p)
238 {
239
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 16 if ((p->buf[2] & 0xF0) == 0) // blocksize code invalid
240 ✗ return 0;
241
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 16 if ((p->buf[2] & 0x0F) == 0x0F) // sample rate code invalid
242 ✗ return 0;
243
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 16 if ((p->buf[3] & 0xF0) >= FLAC_MAX_CHANNELS + FLAC_CHMODE_MID_SIDE << 4)
244 // channel mode invalid
245 ✗ return 0;
246
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 16 if ((p->buf[3] & 0x06) == 0x06) // bits per sample code invalid
247 ✗ return 0;
248
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 16 if ((p->buf[3] & 0x01) == 0x01) // reserved bit set
249 ✗ return 0;
250 16 return AVPROBE_SCORE_EXTENSION / 4 + 1;
251 }
252
253 7204 static int flac_probe(const AVProbeData *p)
254 {
255
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 7204 if ((AV_RB16(p->buf) & 0xFFFE) == 0xFFF8)
256 16 return raw_flac_probe(p);
257
258 /* file header + metadata header + checked bytes of streaminfo */
259
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 7188 if (p->buf_size >= 4 + 4 + 13) {
260 7188 int type = p->buf[4] & 0x7f;
261 7188 int size = AV_RB24(p->buf + 5);
262 7188 int min_block_size = AV_RB16(p->buf + 8);
263 7188 int max_block_size = AV_RB16(p->buf + 10);
264 7188 int sample_rate = AV_RB24(p->buf + 18) >> 4;
265
266
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 7188 if (memcmp(p->buf, "fLaC", 4))
267 7158 return 0;
268
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 30 if (type == FLAC_METADATA_TYPE_STREAMINFO &&
269
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 30 size == FLAC_STREAMINFO_SIZE &&
270
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 30 min_block_size >= 16 &&
271
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 30 max_block_size >= min_block_size &&
272
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 30 sample_rate && sample_rate <= 655350)
273 30 return AVPROBE_SCORE_MAX;
274 ✗ return AVPROBE_SCORE_EXTENSION;
275 }
276
277 ✗ return 0;
278 }
279
280 120 static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_index,
281 int64_t *ppos, int64_t pos_limit)
282 {
283 120 FLACDecContext *flac = s->priv_data;
284 120 FFFormatContext *const si = ffformatcontext(s);
285 120 AVPacket *const pkt = si->parse_pkt;
286 120 AVStream *st = s->streams[stream_index];
287 AVCodecParserContext *parser;
288 int ret;
289 120 int64_t pts = AV_NOPTS_VALUE;
290
291
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 120 if (avio_seek(s->pb, *ppos, SEEK_SET) < 0)
292 ✗ return AV_NOPTS_VALUE;
293
294
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 120 if (!flac->parser_dec) {
295 1 flac->parser_dec = avcodec_alloc_context3(NULL);
296
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 1 if (!flac->parser_dec)
297 ✗ return AV_NOPTS_VALUE;
298
299 1 ret = avcodec_parameters_to_context(flac->parser_dec, st->codecpar);
300
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 1 if (ret < 0)
301 ✗ return ret;
302 }
303
304 120 parser = av_parser_init(st->codecpar->codec_id);
305
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 120 if (!parser)
306 ✗ return AV_NOPTS_VALUE;
307 120 parser->flags |= PARSER_FLAG_USE_CODEC_TS;
308
309 1534 for (;;){
310 uint8_t *data;
311 int size;
312
313 1654 ret = ff_raw_read_partial_packet(s, pkt);
314
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 1654 if (ret < 0){
315
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 36 if (ret == AVERROR(EAGAIN))
316 ✗ continue;
317 else {
318 36 av_packet_unref(pkt);
319 av_assert1(!pkt->size);
320 }
321 }
322 1654 av_parser_parse2(parser, flac->parser_dec,
323 1654 &data, &size, pkt->data, pkt->size,
324 pkt->pts, pkt->dts, *ppos);
325
326 1654 av_packet_unref(pkt);
327
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 1654 if (size) {
328
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 229 if (parser->pts != AV_NOPTS_VALUE){
329 // seeking may not have started from beginning of a frame
330 // calculate frame start position from next frame backwards
331 111 *ppos = parser->next_frame_offset - size;
332 111 pts = parser->pts;
333 111 break;
334 }
335
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 1425 } else if (ret < 0)
336 9 break;
337 }
338 120 av_parser_close(parser);
339 120 return pts;
340 }
341
342 32 static int flac_close(AVFormatContext *s)
343 {
344 32 FLACDecContext *flac = s->priv_data;
345
346 32 avcodec_free_context(&flac->parser_dec);
347
348 32 return 0;
349 }
350
351 26 static int flac_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) {
352 26 AVStream *const st = s->streams[0];
353 26 FFStream *const sti = ffstream(st);
354 int index;
355 int64_t pos;
356 AVIndexEntry e;
357 26 FLACDecContext *flac = s->priv_data;
358
359
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 26 if (!flac->found_seektable || !(s->flags&AVFMT_FLAG_FAST_SEEK)) {
360 26 return -1;
361 }
362
363 ✗ index = av_index_search_timestamp(st, timestamp, flags);
364 ✗ if (index < 0 || index >= sti->nb_index_entries)
365 ✗ return -1;
366
367 ✗ e = sti->index_entries[index];
368 ✗ pos = avio_seek(s->pb, e.pos, SEEK_SET);
369 ✗ if (pos >= 0) {
370 ✗ return 0;
371 }
372 ✗ return -1;
373 }
374
375 const FFInputFormat ff_flac_demuxer = {
376 .p.name = "flac",
377 .p.long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
378 .p.flags = AVFMT_GENERIC_INDEX,
379 .p.extensions = "flac",
380 .p.priv_class = &ff_raw_demuxer_class,
381 .read_probe = flac_probe,
382 .read_header = flac_read_header,
383 .read_close = flac_close,
384 .read_packet = ff_raw_read_partial_packet,
385 .read_seek = flac_seek,
386 .read_timestamp = flac_read_timestamp,
387 .raw_codec_id = AV_CODEC_ID_FLAC,
388 .priv_data_size = sizeof(FLACDecContext),
389 };
390