FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/mpeg.c
Date: 2025-03-08 20:38:41
Exec Total Coverage
Lines: 438 628 69.7%
Functions: 14 15 93.3%
Branches: 338 532 63.5%
Line Branch Exec Source
1 /*
2 * MPEG-1/2 demuxer
3 * Copyright (c) 2000, 2001, 2002 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 "config_components.h"
23
24 #include "libavutil/channel_layout.h"
25 #include "libavutil/mem.h"
26 #include "avformat.h"
27 #include "avio_internal.h"
28 #include "demux.h"
29 #include "internal.h"
30 #include "mpeg.h"
31
32 /*********************************************/
33 /* demux code */
34
35 #define MAX_SYNC_SIZE 100000
36
37 48689 static int check_pes(const uint8_t *p, const uint8_t *end)
38 {
39 int pes1;
40 100762 int pes2 = (p[3] & 0xC0) == 0x80 &&
41
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 51522 (p[4] & 0xC0) != 0x40 &&
42
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 2833 ((p[4] & 0xC0) == 0x00 ||
43
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 1216 (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
44
45
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 50933 for (p += 3; p < end && *p == 0xFF; p++) ;
46
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 48689 if ((*p & 0xC0) == 0x40)
47 4506 p += 2;
48
49
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 48689 if ((*p & 0xF0) == 0x20)
50 1489 pes1 = p[0] & p[2] & p[4] & 1;
51
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 47200 else if ((*p & 0xF0) == 0x30)
52 1189 pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
53 else
54 46011 pes1 = *p == 0x0F;
55
56
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 48689 return pes1 || pes2;
57 }
58
59 49008 static int check_pack_header(const uint8_t *buf)
60 {
61
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 49008 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
62 }
63
64 7204 static int mpegps_probe(const AVProbeData *p)
65 {
66 7204 uint32_t code = -1;
67 int i;
68 7204 int sys = 0, pspack = 0, priv1 = 0, vid = 0;
69 7204 int audio = 0, invalid = 0, score = 0;
70 7204 int endpes = 0;
71
72
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 385901314 for (i = 0; i < p->buf_size; i++) {
73 385894110 code = (code << 8) + p->buf[i];
74
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 385894110 if ((code & 0xffffff00) == 0x100) {
75 49008 int len = p->buf[i + 1] << 8 | p->buf[i + 2];
76
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 49008 int pes = endpes <= i && check_pes(p->buf + i, p->buf + p->buf_size);
77 49008 int pack = check_pack_header(p->buf + i);
78
79
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 49008 if (len > INT_MAX - i)
80 ✗ break;
81
82
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 49008 if (code == SYSTEM_HEADER_START_CODE)
83 43 sys++;
84
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 48965 else if (code == PACK_START_CODE && pack)
85 73 pspack++;
86
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 48892 else if ((code & 0xf0) == VIDEO_ID && pes) {
87 82 endpes = i + len;
88 82 vid++;
89 }
90 // skip pes payload to avoid start code emulation for private
91 // and audio streams
92
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 48810 else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
93
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 48772 else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
94
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 48717 else if (code == 0x1fd && pes) vid++; //VC1
95
96
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 48717 else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++;
97
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 47886 else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++;
98
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 46736 else if (code == PRIVATE_STREAM_1 && !pes) invalid++;
99 }
100 }
101
102
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 7204 if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */
103 21 score = AVPROBE_SCORE_EXTENSION / 2;
104
105 // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n",
106 // vid, audio, sys, pspack, invalid, p->buf_size);
107
108
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 7204 if (sys > invalid && sys * 9 <= pspack * 10)
109
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 33 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2
110
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 66 : AVPROBE_SCORE_EXTENSION / 2 + (audio + vid + pspack > 1); // 1 more than mp3
111
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 7171 if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
112 return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
113
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 10 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
114
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 7161 if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
115
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 12 !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
116 ✗ return (audio > 12 || vid > 6 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
117 ✗ : AVPROBE_SCORE_EXTENSION / 2;
118
119 // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
120 // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
121 // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
122 7161 return score;
123 }
124
125 typedef struct MpegDemuxContext {
126 int32_t header_state;
127 unsigned char psm_es_type[256];
128 int sofdec;
129 int dvd;
130 int imkh_cctv;
131 int raw_ac3;
132 } MpegDemuxContext;
133
134 28 static int mpegps_read_header(AVFormatContext *s)
135 {
136 28 MpegDemuxContext *m = s->priv_data;
137 28 char buffer[7] = { 0 };
138 28 int64_t last_pos = avio_tell(s->pb);
139
140 28 m->header_state = 0xff;
141 28 s->ctx_flags |= AVFMTCTX_NOHEADER;
142
143 28 avio_get_str(s->pb, 6, buffer, sizeof(buffer));
144
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 28 if (!memcmp("IMKH", buffer, 4)) {
145 ✗ m->imkh_cctv = 1;
146
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 28 } else if (!memcmp("Sofdec", buffer, 6)) {
147 ✗ m->sofdec = 1;
148 } else
149 28 avio_seek(s->pb, last_pos, SEEK_SET);
150
151 /* no need to do more */
152 28 return 0;
153 }
154
155 6969 static int64_t get_pts(AVIOContext *pb, int c)
156 {
157 uint8_t buf[5];
158 int ret;
159
160
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 6969 buf[0] = c < 0 ? avio_r8(pb) : c;
161 6969 ret = avio_read(pb, buf + 1, 4);
162
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 6969 if (ret < 4)
163 ✗ return AV_NOPTS_VALUE;
164
165 6969 return ff_parse_pes_pts(buf);
166 }
167
168 24690 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
169 int32_t *header_state)
170 {
171 unsigned int state, v;
172 int val, n;
173
174 24690 state = *header_state;
175 24690 n = *size_ptr;
176
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 313955 while (n > 0) {
177
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 313955 if (avio_feof(pb))
178 129 break;
179 313826 v = avio_r8(pb);
180 313826 n--;
181
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 313826 if (state == 0x000001) {
182 24561 state = ((state << 8) | v) & 0xffffff;
183 24561 val = state;
184 24561 goto found;
185 }
186 289265 state = ((state << 8) | v) & 0xffffff;
187 }
188 129 val = -1;
189
190 24690 found:
191 24690 *header_state = state;
192 24690 *size_ptr = n;
193 24690 return val;
194 }
195
196 /**
197 * Extract stream types from a program stream map
198 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
199 *
200 * @return number of bytes occupied by PSM in the bitstream
201 */
202 ✗ static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
203 {
204 int psm_length, ps_info_length, es_map_length;
205
206 ✗ psm_length = avio_rb16(pb);
207 ✗ avio_r8(pb);
208 ✗ avio_r8(pb);
209 ✗ ps_info_length = avio_rb16(pb);
210
211 /* skip program_stream_info */
212 ✗ avio_skip(pb, ps_info_length);
213 ✗ /*es_map_length = */avio_rb16(pb);
214 /* Ignore es_map_length, trust psm_length */
215 ✗ es_map_length = psm_length - ps_info_length - 10;
216
217 /* at least one es available? */
218 ✗ while (es_map_length >= 4) {
219 ✗ unsigned char type = avio_r8(pb);
220 ✗ unsigned char es_id = avio_r8(pb);
221 ✗ uint16_t es_info_length = avio_rb16(pb);
222
223 /* remember mapping from stream id to stream type */
224 ✗ m->psm_es_type[es_id] = type;
225 /* skip program_stream_info */
226 ✗ avio_skip(pb, es_info_length);
227 ✗ es_map_length -= 4 + es_info_length;
228 }
229 ✗ avio_rb32(pb); /* crc32 */
230 ✗ return 2 + psm_length;
231 }
232
233 /* read the next PES header. Return its position in ppos
234 * (if not NULL), and its start code, pts and dts.
235 */
236 13386 static int mpegps_read_pes_header(AVFormatContext *s,
237 int64_t *ppos, int *pstart_code,
238 int64_t *ppts, int64_t *pdts)
239 {
240 13386 MpegDemuxContext *m = s->priv_data;
241 int len, size, startcode, c, flags, header_len;
242 int pes_ext, ext2_len, id_ext, skip;
243 int64_t pts, dts;
244 13386 int64_t last_sync = avio_tell(s->pb);
245
246 ✗ error_redo:
247 13386 avio_seek(s->pb, last_sync, SEEK_SET);
248 11304 redo:
249 /* next start code (should be immediately after) */
250 24690 m->header_state = 0xff;
251 24690 size = MAX_SYNC_SIZE;
252 24690 startcode = find_next_start_code(s->pb, &size, &m->header_state);
253 24690 last_sync = avio_tell(s->pb);
254
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 24690 if (startcode < 0) {
255
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 129 if (avio_feof(s->pb))
256 129 return AVERROR_EOF;
257 // FIXME we should remember header_state
258 ✗ return FFERROR_REDO;
259 }
260
261
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 24561 if (startcode == PACK_START_CODE)
262 10261 goto redo;
263
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 14300 if (startcode == SYSTEM_HEADER_START_CODE)
264 192 goto redo;
265
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 14108 if (startcode == PADDING_STREAM) {
266 796 avio_skip(s->pb, avio_rb16(s->pb));
267 796 goto redo;
268 }
269
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 13312 if (startcode == PRIVATE_STREAM_2) {
270
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 44 if (!m->sofdec) {
271 /* Need to detect whether this from a DVD or a 'Sofdec' stream */
272 3 int len = avio_rb16(s->pb);
273 3 int bytesread = 0;
274 3 uint8_t *ps2buf = av_malloc(len);
275
276
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 3 if (ps2buf) {
277 3 bytesread = avio_read(s->pb, ps2buf, len);
278
279
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 3 if (bytesread != len) {
280 ✗ avio_skip(s->pb, len - bytesread);
281 } else {
282 3 uint8_t *p = 0;
283
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 3 if (len >= 6)
284 3 p = memchr(ps2buf, 'S', len - 5);
285
286
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 3 if (p)
287 ✗ m->sofdec = !memcmp(p+1, "ofdec", 5);
288
289 3 m->sofdec -= !m->sofdec;
290
291
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 3 if (m->sofdec < 0) {
292
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 3 if (len == 980 && ps2buf[0] == 0) {
293 /* PCI structure? */
294 3 uint32_t startpts = AV_RB32(ps2buf + 0x0d);
295 3 uint32_t endpts = AV_RB32(ps2buf + 0x11);
296 3 uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
297 3 uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
298 3 uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
299
300
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 6 m->dvd = (hours <= 23 &&
301
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 3 mins <= 59 &&
302 3 secs <= 59 &&
303
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 3 (ps2buf[0x19] & 0x0f) < 10 &&
304
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 3 (ps2buf[0x1a] & 0x0f) < 10 &&
305
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 6 (ps2buf[0x1b] & 0x0f) < 10 &&
306 endpts >= startpts);
307 ✗ } else if (len == 1018 && ps2buf[0] == 1) {
308 /* DSI structure? */
309 ✗ uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
310 ✗ uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
311 ✗ uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
312
313 ✗ m->dvd = (hours <= 23 &&
314 ✗ mins <= 59 &&
315 ✗ secs <= 59 &&
316 ✗ (ps2buf[0x1d] & 0x0f) < 10 &&
317 ✗ (ps2buf[0x1e] & 0x0f) < 10 &&
318 ✗ (ps2buf[0x1f] & 0x0f) < 10);
319 }
320 }
321 }
322
323 3 av_free(ps2buf);
324
325 /* If this isn't a DVD packet or no memory
326 * could be allocated, just ignore it.
327 * If we did, move back to the start of the
328 * packet (plus 'length' field) */
329
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 3 if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
330 /* Skip back failed.
331 * This packet will be lost but that can't be helped
332 * if we can't skip back
333 */
334 ✗ goto redo;
335 }
336 } else {
337 /* No memory */
338 ✗ avio_skip(s->pb, len);
339 ✗ goto redo;
340 }
341
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 41 } else if (!m->dvd) {
342 ✗ int len = avio_rb16(s->pb);
343 ✗ avio_skip(s->pb, len);
344 ✗ goto redo;
345 }
346 }
347
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 13312 if (startcode == PROGRAM_STREAM_MAP) {
348 ✗ mpegps_psm_parse(m, s->pb);
349 ✗ goto redo;
350 }
351
352 /* find matching stream */
353
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 13367 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
354
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 12959 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
355
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 99 (startcode == 0x1bd) ||
356 (startcode == PRIVATE_STREAM_2) ||
357 (startcode == 0x1fd)))
358 55 goto redo;
359
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 13257 if (ppos) {
360 12870 *ppos = avio_tell(s->pb) - 4;
361 }
362 13257 len = avio_rb16(s->pb);
363 13257 pts =
364 13257 dts = AV_NOPTS_VALUE;
365
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 13257 if (startcode != PRIVATE_STREAM_2)
366 {
367 /* stuffing */
368 for (;;) {
369
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 13219 if (len < 1)
370 ✗ goto error_redo;
371 13219 c = avio_r8(s->pb);
372 13219 len--;
373 /* XXX: for MPEG-1, should test only bit 7 */
374
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 13219 if (c != 0xff)
375 13213 break;
376 }
377
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 13213 if ((c & 0xc0) == 0x40) {
378 /* buffer scale & size */
379 ✗ avio_r8(s->pb);
380 ✗ c = avio_r8(s->pb);
381 ✗ len -= 2;
382 }
383
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 13213 if ((c & 0xe0) == 0x20) {
384 922 dts =
385 922 pts = get_pts(s->pb, c);
386 922 len -= 4;
387
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 922 if (c & 0x10) {
388 438 dts = get_pts(s->pb, -1);
389 438 len -= 5;
390 }
391
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 12291 } else if ((c & 0xc0) == 0x80) {
392 /* mpeg 2 PES */
393 9743 flags = avio_r8(s->pb);
394 9743 header_len = avio_r8(s->pb);
395 9743 len -= 2;
396
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 9743 if (header_len > len)
397 ✗ goto error_redo;
398 9743 len -= header_len;
399
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 9743 if (flags & 0x80) {
400 5578 dts = pts = get_pts(s->pb, -1);
401 5578 header_len -= 5;
402
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 5578 if (flags & 0x40) {
403 31 dts = get_pts(s->pb, -1);
404 31 header_len -= 5;
405 }
406 }
407
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 9743 if (flags & 0x3f && header_len == 0) {
408 ✗ flags &= 0xC0;
409 ✗ av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
410 }
411
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 9743 if (flags & 0x01) { /* PES extension */
412 42 pes_ext = avio_r8(s->pb);
413 42 header_len--;
414 /* Skip PES private data, program packet sequence counter
415 * and P-STD buffer */
416 42 skip = (pes_ext >> 4) & 0xb;
417 42 skip += skip & 0x9;
418
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 42 if (pes_ext & 0x40 || skip > header_len) {
419 ✗ av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
420 ✗ pes_ext = skip = 0;
421 }
422 42 avio_skip(s->pb, skip);
423 42 header_len -= skip;
424
425
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 42 if (pes_ext & 0x01) { /* PES extension 2 */
426 ✗ ext2_len = avio_r8(s->pb);
427 ✗ header_len--;
428 ✗ if ((ext2_len & 0x7f) > 0) {
429 ✗ id_ext = avio_r8(s->pb);
430 ✗ if ((id_ext & 0x80) == 0)
431 ✗ startcode = ((startcode & 0xff) << 8) | id_ext;
432 ✗ header_len--;
433 }
434 }
435 }
436
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 9743 if (header_len < 0)
437 ✗ goto error_redo;
438 9743 avio_skip(s->pb, header_len);
439
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 2548 } else if (c != 0xf)
440 ✗ goto redo;
441 }
442
443
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 13257 if (startcode == PRIVATE_STREAM_1) {
444 5759 int ret = ffio_ensure_seekback(s->pb, 2);
445
446
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 5759 if (ret < 0)
447 ✗ return ret;
448
449 5759 startcode = avio_r8(s->pb);
450 5759 m->raw_ac3 = 0;
451
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 5759 if (startcode == 0x0b) {
452 ✗ if (avio_r8(s->pb) == 0x77) {
453 ✗ startcode = 0x80;
454 ✗ m->raw_ac3 = 1;
455 ✗ avio_skip(s->pb, -2);
456 } else {
457 ✗ avio_skip(s->pb, -1);
458 }
459 } else {
460 5759 len--;
461 }
462 }
463
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 13257 if (len < 0)
464 ✗ goto error_redo;
465
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 13257 if (dts != AV_NOPTS_VALUE && ppos) {
466 int i;
467
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 13852 for (i = 0; i < s->nb_streams; i++) {
468
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 7616 if (startcode == s->streams[i]->id &&
469
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 6202 (s->pb->seekable & AVIO_SEEKABLE_NORMAL) /* index useless on streams anyway */) {
470 6202 ff_reduce_index(s, i);
471 6202 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
472 AVINDEX_KEYFRAME /* FIXME keyframe? */);
473 }
474 }
475 }
476
477 13257 *pstart_code = startcode;
478 13257 *ppts = pts;
479 13257 *pdts = dts;
480 13257 return len;
481 }
482
483 12061 static int mpegps_read_packet(AVFormatContext *s,
484 AVPacket *pkt)
485 {
486 12061 MpegDemuxContext *m = s->priv_data;
487 AVStream *st;
488 FFStream *sti;
489 int len, startcode, i, es_type, ret;
490 12061 int pcm_dvd = 0;
491 12061 int request_probe= 0;
492 12061 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
493 enum AVMediaType type;
494 int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
495
496 12542 redo:
497 12542 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
498
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 12542 if (len < 0)
499 78 return len;
500
501
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 12464 if (startcode >= 0x80 && startcode <= 0xcf) {
502
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 5342 if (len < 4)
503 ✗ goto skip;
504
505
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 5342 if (!m->raw_ac3) {
506 /* audio: skip header */
507 5342 avio_skip(s->pb, 3);
508 5342 len -= 3;
509
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 5342 if (startcode >= 0xb0 && startcode <= 0xbf) {
510 /* MLP/TrueHD audio has a 4-byte header */
511 ✗ avio_r8(s->pb);
512 ✗ len--;
513
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 5342 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
514 5336 ret = ffio_ensure_seekback(s->pb, 3);
515
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 5336 if (ret < 0)
516 ✗ return ret;
517 5336 pcm_dvd = (avio_rb24(s->pb) & 0xFF) == 0x80;
518 5336 avio_skip(s->pb, -3);
519 }
520 }
521 }
522
523 /* now find stream */
524
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 16063 for (i = 0; i < s->nb_streams; i++) {
525 16024 st = s->streams[i];
526
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✓ Branch 1 taken 3599 times.
 16024 if (st->id == startcode)
527 12425 goto found;
528 }
529
530 39 es_type = m->psm_es_type[startcode & 0xff];
531
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✓ Branch 1 taken 39 times.
 39 if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
532 ✗ codec_id = AV_CODEC_ID_MPEG2VIDEO;
533 ✗ type = AVMEDIA_TYPE_VIDEO;
534
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 39 } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
535 ✗ codec_id = AV_CODEC_ID_MPEG2VIDEO;
536 ✗ type = AVMEDIA_TYPE_VIDEO;
537
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 39 } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
538 es_type == STREAM_TYPE_AUDIO_MPEG2) {
539 ✗ codec_id = AV_CODEC_ID_MP3;
540 ✗ type = AVMEDIA_TYPE_AUDIO;
541
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 39 } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
542 ✗ codec_id = AV_CODEC_ID_AAC;
543 ✗ type = AVMEDIA_TYPE_AUDIO;
544
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 39 } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
545 ✗ codec_id = AV_CODEC_ID_MPEG4;
546 ✗ type = AVMEDIA_TYPE_VIDEO;
547
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 39 } else if (es_type == STREAM_TYPE_VIDEO_H264) {
548 ✗ codec_id = AV_CODEC_ID_H264;
549 ✗ type = AVMEDIA_TYPE_VIDEO;
550
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 39 } else if (es_type == STREAM_TYPE_VIDEO_HEVC) {
551 ✗ codec_id = AV_CODEC_ID_HEVC;
552 ✗ type = AVMEDIA_TYPE_VIDEO;
553
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 39 } else if (es_type == STREAM_TYPE_VIDEO_VVC) {
554 ✗ codec_id = AV_CODEC_ID_VVC;
555 ✗ type = AVMEDIA_TYPE_VIDEO;
556
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 39 } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
557 ✗ codec_id = AV_CODEC_ID_AC3;
558 ✗ type = AVMEDIA_TYPE_AUDIO;
559
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 39 } else if (es_type == 0x90) {
560 ✗ codec_id = AV_CODEC_ID_PCM_ALAW;
561 ✗ type = AVMEDIA_TYPE_AUDIO;
562
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 39 } else if (m->imkh_cctv && es_type == 0x91) {
563 ✗ codec_id = AV_CODEC_ID_PCM_MULAW;
564 ✗ type = AVMEDIA_TYPE_AUDIO;
565
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 39 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
566 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
567 unsigned char buf[8];
568
569 13 ret = avio_read(s->pb, buf, 8);
570
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 13 if (ret != 8)
571 ✗ return AVERROR_INVALIDDATA;
572 13 avio_seek(s->pb, -8, SEEK_CUR);
573
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 13 if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
574 2 codec_id = AV_CODEC_ID_CAVS;
575 else
576 11 request_probe= 1;
577 13 type = AVMEDIA_TYPE_VIDEO;
578
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 26 } else if (startcode == PRIVATE_STREAM_2) {
579 3 type = AVMEDIA_TYPE_DATA;
580 3 codec_id = AV_CODEC_ID_DVD_NAV;
581
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 23 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
582 7 type = AVMEDIA_TYPE_AUDIO;
583
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 7 if (m->sofdec > 0) {
584 ✗ codec_id = AV_CODEC_ID_ADPCM_ADX;
585 // Auto-detect AC-3
586 ✗ request_probe = 50;
587
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 7 } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) {
588 ✗ codec_id = AV_CODEC_ID_PCM_ALAW;
589 ✗ request_probe = 50;
590 } else {
591 7 codec_id = AV_CODEC_ID_MP2;
592
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 7 if (m->imkh_cctv)
593 ✗ request_probe = 25;
594 }
595
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 16 } else if (startcode >= 0x80 && startcode <= 0x87) {
596 1 type = AVMEDIA_TYPE_AUDIO;
597 1 codec_id = AV_CODEC_ID_AC3;
598
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 15 } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
599
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 15 (startcode >= 0x98 && startcode <= 0x9f)) {
600 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
601 ✗ type = AVMEDIA_TYPE_AUDIO;
602 ✗ codec_id = AV_CODEC_ID_DTS;
603
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 15 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
604 13 type = AVMEDIA_TYPE_AUDIO;
605
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 13 if (!pcm_dvd) {
606 ✗ codec_id = AV_CODEC_ID_MLP;
607 } else {
608 13 codec_id = AV_CODEC_ID_PCM_DVD;
609 }
610
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 2 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
611 ✗ type = AVMEDIA_TYPE_AUDIO;
612 ✗ codec_id = AV_CODEC_ID_TRUEHD;
613
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 2 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
614 /* Used for both AC-3 and E-AC-3 in EVOB files */
615 ✗ type = AVMEDIA_TYPE_AUDIO;
616 ✗ codec_id = AV_CODEC_ID_AC3;
617
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 2 } else if (startcode >= 0x20 && startcode <= 0x3f) {
618 2 type = AVMEDIA_TYPE_SUBTITLE;
619 2 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
620 ✗ } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
621 ✗ type = AVMEDIA_TYPE_VIDEO;
622 ✗ codec_id = AV_CODEC_ID_VC1;
623 ✗ } else if (startcode == 0x69 || startcode == 0x49) {
624 ✗ type = AVMEDIA_TYPE_SUBTITLE;
625 ✗ codec_id = AV_CODEC_ID_IVTV_VBI;
626 } else {
627 ✗ skip:
628 /* skip packet */
629 481 avio_skip(s->pb, len);
630 481 goto redo;
631 }
632 /* no stream found: add a new stream */
633 39 st = avformat_new_stream(s, NULL);
634
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✓ Branch 1 taken 39 times.
 39 if (!st)
635 ✗ goto skip;
636 39 sti = ffstream(st);
637 39 st->id = startcode;
638 39 st->codecpar->codec_type = type;
639 39 st->codecpar->codec_id = codec_id;
640
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 39 if ( st->codecpar->codec_id == AV_CODEC_ID_PCM_MULAW
641
1/2
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 39 || st->codecpar->codec_id == AV_CODEC_ID_PCM_ALAW) {
642 ✗ st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
643 ✗ st->codecpar->sample_rate = 8000;
644 }
645 39 sti->request_probe = request_probe;
646 39 sti->need_parsing = AVSTREAM_PARSE_FULL;
647
648 12464 found:
649
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 12464 if (st->discard >= AVDISCARD_ALL)
650 481 goto skip;
651
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 11983 if (startcode >= 0xa0 && startcode <= 0xaf) {
652
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 5336 if (st->codecpar->codec_id == AV_CODEC_ID_MLP) {
653 ✗ if (len < 6)
654 ✗ goto skip;
655 ✗ avio_skip(s->pb, 6);
656 ✗ len -=6;
657 }
658 }
659 11983 ret = av_get_packet(s->pb, pkt, len);
660
661 11983 pkt->pts = pts;
662 11983 pkt->dts = dts;
663 11983 pkt->pos = dummy_pos;
664 11983 pkt->stream_index = st->index;
665
666
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 11983 if (s->debug & FF_FDEBUG_TS)
667 ✗ av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
668 ✗ pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
669 pkt->size);
670
671 11983 return (ret < 0) ? ret : 0;
672 }
673
674 91 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
675 int64_t *ppos, int64_t pos_limit)
676 {
677 int len, startcode;
678 int64_t pos, pts, dts;
679
680 91 pos = *ppos;
681
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✗ Branch 2 not taken.
 91 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
682 ✗ return AV_NOPTS_VALUE;
683
684 for (;;) {
685 451 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
686
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 451 if (len < 0) {
687
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 45 if (s->debug & FF_FDEBUG_TS)
688 ✗ av_log(s, AV_LOG_DEBUG, "none (ret=%d)\n", len);
689 45 return AV_NOPTS_VALUE;
690 }
691
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 406 if (startcode == s->streams[stream_index]->id &&
692
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 323 dts != AV_NOPTS_VALUE) {
693 46 break;
694 }
695 360 avio_skip(s->pb, len);
696 }
697
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✓ Branch 1 taken 46 times.
 46 if (s->debug & FF_FDEBUG_TS)
698 ✗ av_log(s, AV_LOG_DEBUG, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
699 pos, dts, dts / 90000.0);
700 46 *ppos = pos;
701 46 return dts;
702 }
703
704 const FFInputFormat ff_mpegps_demuxer = {
705 .p.name = "mpeg",
706 .p.long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
707 .p.flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
708 .priv_data_size = sizeof(MpegDemuxContext),
709 .read_probe = mpegps_probe,
710 .read_header = mpegps_read_header,
711 .read_packet = mpegps_read_packet,
712 .read_timestamp = mpegps_read_dts,
713 };
714
715 #if CONFIG_VOBSUB_DEMUXER
716
717 #include "subtitles.h"
718 #include "libavutil/avassert.h"
719 #include "libavutil/bprint.h"
720 #include "libavutil/opt.h"
721
722 #define REF_STRING "# VobSub index file,"
723 #define MAX_LINE_SIZE 2048
724
725 typedef struct VobSubDemuxContext {
726 const AVClass *class;
727 AVFormatContext *sub_ctx;
728 FFDemuxSubtitlesQueue q[32];
729 char *sub_name;
730 } VobSubDemuxContext;
731
732 7204 static int vobsub_probe(const AVProbeData *p)
733 {
734
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 7204 if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
735 2 return AVPROBE_SCORE_MAX;
736 7202 return 0;
737 }
738
739 3 static int vobsub_read_close(AVFormatContext *s)
740 {
741 3 VobSubDemuxContext *vobsub = s->priv_data;
742 int i;
743
744
2/2
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 6 for (i = 0; i < s->nb_streams; i++)
745 3 ff_subtitles_queue_clean(&vobsub->q[i]);
746 3 avformat_close_input(&vobsub->sub_ctx);
747 3 return 0;
748 }
749
750 3 static int vobsub_read_header(AVFormatContext *s)
751 {
752 3 int i, ret = 0, header_parsed = 0, langidx = 0;
753 3 VobSubDemuxContext *vobsub = s->priv_data;
754 const AVInputFormat *iformat;
755 size_t fname_len;
756 AVBPrint header;
757 3 int64_t delay = 0;
758 3 AVStream *st = NULL;
759 3 int stream_id = -1;
760 3 char id[64] = {0};
761 3 char alt[MAX_LINE_SIZE] = {0};
762
763
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 3 if (!vobsub->sub_name) {
764 char *ext;
765 3 vobsub->sub_name = av_strdup(s->url);
766
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✓ Branch 1 taken 3 times.
 3 if (!vobsub->sub_name) {
767 ✗ return AVERROR(ENOMEM);
768 }
769
770 3 fname_len = strlen(vobsub->sub_name);
771 3 ext = vobsub->sub_name - 3 + fname_len;
772
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 3 if (fname_len < 4 || *(ext - 1) != '.') {
773 ✗ av_log(s, AV_LOG_ERROR, "The input index filename is too short "
774 "to guess the associated .SUB file\n");
775 ✗ return AVERROR_INVALIDDATA;
776 }
777
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 3 memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
778 3 av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->url, vobsub->sub_name);
779 }
780
781
1/2
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✓ Branch 2 taken 3 times.
 3 if (!(iformat = av_find_input_format("mpeg"))) {
782 ✗ return AVERROR_DEMUXER_NOT_FOUND;
783 }
784
785 3 vobsub->sub_ctx = avformat_alloc_context();
786
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 3 if (!vobsub->sub_ctx) {
787 ✗ return AVERROR(ENOMEM);
788 }
789
790
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 3 if ((ret = ff_copy_whiteblacklists(vobsub->sub_ctx, s)) < 0)
791 ✗ return ret;
792
793 3 ret = avformat_open_input(&vobsub->sub_ctx, vobsub->sub_name, iformat, NULL);
794
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 3 if (ret < 0) {
795 ✗ av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", vobsub->sub_name);
796 ✗ return ret;
797 }
798
799 3 av_bprint_init(&header, 0, INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE);
800
801
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 189 while (!avio_feof(s->pb)) {
802 char line[MAX_LINE_SIZE];
803 189 int len = ff_get_line(s->pb, line, sizeof(line));
804
805
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 189 if (!len)
806 3 break;
807
808 186 line[strcspn(line, "\r\n")] = 0;
809
810
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 186 if (!strncmp(line, "id:", 3)) {
811
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 3 if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
812 ✗ av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
813 "assuming 'id: und, index: 0'\n", line);
814 ✗ strcpy(id, "und");
815 ✗ stream_id = 0;
816 }
817
818
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 3 if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
819 ✗ av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
820 ✗ ret = AVERROR(EINVAL);
821 ✗ goto end;
822 }
823
824 3 header_parsed = 1;
825 3 alt[0] = '\0';
826 /* We do not create the stream immediately to avoid adding empty
827 * streams. See the following timestamp entry. */
828
829 3 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
830
831
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 183 } else if (!strncmp(line, "timestamp:", 10)) {
832 AVPacket *sub;
833 int hh, mm, ss, ms;
834 int64_t pos, timestamp;
835 141 const char *p = line + 10;
836
837
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 141 if (stream_id == -1) {
838 ✗ av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
839 ✗ ret = AVERROR_INVALIDDATA;
840 ✗ goto end;
841 }
842
843
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 141 if (!st || st->id != stream_id) {
844 3 st = avformat_new_stream(s, NULL);
845
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 3 if (!st) {
846 ✗ ret = AVERROR(ENOMEM);
847 ✗ goto end;
848 }
849 3 st->id = stream_id;
850 3 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
851 3 st->codecpar->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
852 3 avpriv_set_pts_info(st, 64, 1, 1000);
853 3 av_dict_set(&st->metadata, "language", id, 0);
854
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 3 if (alt[0])
855 ✗ av_dict_set(&st->metadata, "title", alt, 0);
856 }
857
858
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 141 if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
859 &hh, &mm, &ss, &ms, &pos) != 5) {
860 ✗ av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
861 "abort parsing\n", line);
862 ✗ ret = AVERROR_INVALIDDATA;
863 ✗ goto end;
864 }
865 141 timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
866 141 timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
867
868 141 sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
869
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 141 if (!sub) {
870 ✗ ret = AVERROR(ENOMEM);
871 ✗ goto end;
872 }
873 141 sub->pos = pos;
874 141 sub->pts = timestamp;
875 141 sub->stream_index = s->nb_streams - 1;
876
877
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 42 } else if (!strncmp(line, "alt:", 4)) {
878 ✗ const char *p = line + 4;
879
880 ✗ while (*p == ' ')
881 ✗ p++;
882 ✗ av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
883 ✗ av_strlcpy(alt, p, sizeof(alt));
884 ✗ header_parsed = 1;
885
886
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 42 } else if (!strncmp(line, "delay:", 6)) {
887 ✗ int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
888 ✗ const char *p = line + 6;
889
890 ✗ while (*p == ' ')
891 ✗ p++;
892 ✗ if (*p == '-' || *p == '+') {
893 ✗ sign = *p == '-' ? -1 : 1;
894 ✗ p++;
895 }
896 ✗ sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
897 ✗ delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
898
899
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 42 } else if (!strncmp(line, "langidx:", 8)) {
900 3 const char *p = line + 8;
901
902
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 3 if (sscanf(p, "%d", &langidx) != 1)
903 ✗ av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
904
905
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 39 } else if (!header_parsed) {
906
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 39 if (line[0] && line[0] != '#')
907 9 av_bprintf(&header, "%s\n", line);
908 }
909 }
910
911
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 3 if (langidx < s->nb_streams)
912 3 s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
913
914
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 6 for (i = 0; i < s->nb_streams; i++) {
915 3 vobsub->q[i].sort = SUB_SORT_POS_TS;
916 3 vobsub->q[i].keep_duplicates = 1;
917 3 ff_subtitles_queue_finalize(s, &vobsub->q[i]);
918 }
919
920
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 3 if (!av_bprint_is_complete(&header)) {
921 ✗ ret = AVERROR(ENOMEM);
922 ✗ goto end;
923 }
924
2/2
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 6 for (i = 0; i < s->nb_streams; i++) {
925 3 AVCodecParameters *par = s->streams[i]->codecpar;
926 3 ret = ff_alloc_extradata(par, header.len);
927
1/2
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 3 if (ret < 0) {
928 ✗ goto end;
929 }
930 3 memcpy(par->extradata, header.str, header.len);
931 }
932 3 end:
933 3 av_bprint_finalize(&header, NULL);
934 3 return ret;
935 }
936
937 141 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
938 {
939 141 VobSubDemuxContext *vobsub = s->priv_data;
940 FFDemuxSubtitlesQueue *q;
941 141 AVIOContext *pb = vobsub->sub_ctx->pb;
942 141 int ret, psize, total_read = 0, i;
943
944 141 int64_t min_ts = INT64_MAX;
945 141 int sid = 0;
946
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 282 for (i = 0; i < s->nb_streams; i++) {
947 141 FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
948 int64_t ts;
949
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 141 av_assert0(tmpq->nb_subs);
950
951
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 141 if (tmpq->current_sub_idx >= tmpq->nb_subs)
952 ✗ continue;
953
954 141 ts = tmpq->subs[tmpq->current_sub_idx]->pts;
955
1/2
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 141 if (ts < min_ts) {
956 141 min_ts = ts;
957 141 sid = i;
958 }
959 }
960 141 q = &vobsub->q[sid];
961 /* The returned packet will have size zero,
962 * so that it can be directly used with av_grow_packet. */
963 141 ret = ff_subtitles_queue_read_packet(q, pkt);
964
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 141 if (ret < 0)
965 ✗ return ret;
966
967 /* compute maximum packet size using the next packet position. This is
968 * useful when the len in the header is non-sense */
969
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 141 if (q->current_sub_idx < q->nb_subs) {
970 138 psize = q->subs[q->current_sub_idx]->pos - pkt->pos;
971 } else {
972 3 int64_t fsize = avio_size(pb);
973
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 3 psize = fsize < 0 ? 0xffff : fsize - pkt->pos;
974 }
975
976 141 avio_seek(pb, pkt->pos, SEEK_SET);
977
978 do {
979 int n, to_read, startcode;
980 int64_t pts, dts;
981 393 int64_t old_pos = avio_tell(pb), new_pos;
982 int pkt_size;
983
984 393 ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
985
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 393 if (ret < 0) {
986
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 6 if (pkt->size) // raise packet even if incomplete
987 129 break;
988 3 return ret;
989 }
990 387 to_read = ret & 0xffff;
991 387 new_pos = avio_tell(pb);
992 387 pkt_size = ret + (new_pos - old_pos);
993
994 /* this prevents reads above the current packet */
995
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 387 if (total_read + pkt_size > psize)
996 126 break;
997 261 total_read += pkt_size;
998
999 /* the current chunk doesn't match the stream index (unlikely) */
1000
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 261 if ((startcode & 0x1f) != s->streams[pkt->stream_index]->id)
1001 ✗ break;
1002
1003 261 ret = av_grow_packet(pkt, to_read);
1004
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 261 if (ret < 0)
1005 ✗ return ret;
1006
1007 261 n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
1008
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 261 if (n < to_read)
1009 ✗ pkt->size -= to_read - n;
1010
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 261 } while (total_read < psize);
1011
1012 138 return 0;
1013 }
1014
1015 1 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
1016 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
1017 {
1018 1 VobSubDemuxContext *vobsub = s->priv_data;
1019
1020 /* Rescale requested timestamps based on the first stream (timebase is the
1021 * same for all subtitles stream within a .idx/.sub). Rescaling is done just
1022 * like in avformat_seek_file(). */
1023
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 1 if (stream_index == -1 && s->nb_streams != 1) {
1024 ✗ int i, ret = 0;
1025 ✗ AVRational time_base = s->streams[0]->time_base;
1026 ✗ ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
1027 ✗ min_ts = av_rescale_rnd(min_ts, time_base.den,
1028 ✗ time_base.num * (int64_t)AV_TIME_BASE,
1029 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
1030 ✗ max_ts = av_rescale_rnd(max_ts, time_base.den,
1031 ✗ time_base.num * (int64_t)AV_TIME_BASE,
1032 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
1033 ✗ for (i = 0; i < s->nb_streams; i++) {
1034 ✗ int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
1035 min_ts, ts, max_ts, flags);
1036 ✗ if (r < 0)
1037 ✗ ret = r;
1038 }
1039 ✗ return ret;
1040 }
1041
1042
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 1 if (stream_index == -1) // only 1 stream
1043 ✗ stream_index = 0;
1044 1 return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
1045 min_ts, ts, max_ts, flags);
1046 }
1047
1048 static const AVOption options[] = {
1049 { "sub_name", "URI for .sub file", offsetof(VobSubDemuxContext, sub_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
1050 { NULL }
1051 };
1052
1053 static const AVClass vobsub_demuxer_class = {
1054 .class_name = "vobsub",
1055 .item_name = av_default_item_name,
1056 .option = options,
1057 .version = LIBAVUTIL_VERSION_INT,
1058 };
1059
1060 const FFInputFormat ff_vobsub_demuxer = {
1061 .p.name = "vobsub",
1062 .p.long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
1063 .p.flags = AVFMT_SHOW_IDS,
1064 .p.extensions = "idx",
1065 .p.priv_class = &vobsub_demuxer_class,
1066 .priv_data_size = sizeof(VobSubDemuxContext),
1067 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
1068 .read_probe = vobsub_probe,
1069 .read_header = vobsub_read_header,
1070 .read_packet = vobsub_read_packet,
1071 .read_seek2 = vobsub_read_seek,
1072 .read_close = vobsub_read_close,
1073 };
1074 #endif
1075