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path: root/libavformat/mvdec.c (plain)
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1/*
2 * Silicon Graphics Movie demuxer
3 * Copyright (c) 2012 Peter Ross
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 * Silicon Graphics Movie demuxer
25 */
26
27#include "libavutil/channel_layout.h"
28#include "libavutil/eval.h"
29#include "libavutil/intreadwrite.h"
30#include "libavutil/rational.h"
31
32#include "avformat.h"
33#include "internal.h"
34
35typedef struct MvContext {
36 int nb_video_tracks;
37 int nb_audio_tracks;
38
39 int eof_count; ///< number of streams that have finished
40 int stream_index; ///< current stream index
41 int frame[2]; ///< frame nb for current stream
42
43 int acompression; ///< compression level for audio stream
44 int aformat; ///< audio format
45} MvContext;
46
47#define AUDIO_FORMAT_SIGNED 401
48
49static int mv_probe(AVProbeData *p)
50{
51 if (AV_RB32(p->buf) == MKBETAG('M', 'O', 'V', 'I') &&
52 AV_RB16(p->buf + 4) < 3)
53 return AVPROBE_SCORE_MAX;
54 return 0;
55}
56
57static char *var_read_string(AVIOContext *pb, int size)
58{
59 int n;
60 char *str;
61
62 if (size < 0 || size == INT_MAX)
63 return NULL;
64
65 str = av_malloc(size + 1);
66 if (!str)
67 return NULL;
68 n = avio_get_str(pb, size, str, size + 1);
69 if (n < size)
70 avio_skip(pb, size - n);
71 return str;
72}
73
74static int var_read_int(AVIOContext *pb, int size)
75{
76 int v;
77 char *s = var_read_string(pb, size);
78 if (!s)
79 return 0;
80 v = strtol(s, NULL, 10);
81 av_free(s);
82 return v;
83}
84
85static AVRational var_read_float(AVIOContext *pb, int size)
86{
87 AVRational v;
88 char *s = var_read_string(pb, size);
89 if (!s)
90 return (AVRational) { 0, 0 };
91 v = av_d2q(av_strtod(s, NULL), INT_MAX);
92 av_free(s);
93 return v;
94}
95
96static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
97{
98 char *value = var_read_string(avctx->pb, size);
99 if (value)
100 av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
101}
102
103static int set_channels(AVFormatContext *avctx, AVStream *st, int channels)
104{
105 if (channels <= 0) {
106 av_log(avctx, AV_LOG_ERROR, "Channel count %d invalid.\n", channels);
107 return AVERROR_INVALIDDATA;
108 }
109 st->codecpar->channels = channels;
110 st->codecpar->channel_layout = (st->codecpar->channels == 1) ? AV_CH_LAYOUT_MONO
111 : AV_CH_LAYOUT_STEREO;
112 return 0;
113}
114
115/**
116 * Parse global variable
117 * @return < 0 if unknown
118 */
119static int parse_global_var(AVFormatContext *avctx, AVStream *st,
120 const char *name, int size)
121{
122 MvContext *mv = avctx->priv_data;
123 AVIOContext *pb = avctx->pb;
124 if (!strcmp(name, "__NUM_I_TRACKS")) {
125 mv->nb_video_tracks = var_read_int(pb, size);
126 } else if (!strcmp(name, "__NUM_A_TRACKS")) {
127 mv->nb_audio_tracks = var_read_int(pb, size);
128 } else if (!strcmp(name, "COMMENT") || !strcmp(name, "TITLE")) {
129 var_read_metadata(avctx, name, size);
130 } else if (!strcmp(name, "LOOP_MODE") || !strcmp(name, "NUM_LOOPS") ||
131 !strcmp(name, "OPTIMIZED")) {
132 avio_skip(pb, size); // ignore
133 } else
134 return AVERROR_INVALIDDATA;
135
136 return 0;
137}
138
139/**
140 * Parse audio variable
141 * @return < 0 if unknown
142 */
143static int parse_audio_var(AVFormatContext *avctx, AVStream *st,
144 const char *name, int size)
145{
146 MvContext *mv = avctx->priv_data;
147 AVIOContext *pb = avctx->pb;
148 if (!strcmp(name, "__DIR_COUNT")) {
149 st->nb_frames = var_read_int(pb, size);
150 } else if (!strcmp(name, "AUDIO_FORMAT")) {
151 mv->aformat = var_read_int(pb, size);
152 } else if (!strcmp(name, "COMPRESSION")) {
153 mv->acompression = var_read_int(pb, size);
154 } else if (!strcmp(name, "DEFAULT_VOL")) {
155 var_read_metadata(avctx, name, size);
156 } else if (!strcmp(name, "NUM_CHANNELS")) {
157 return set_channels(avctx, st, var_read_int(pb, size));
158 } else if (!strcmp(name, "SAMPLE_RATE")) {
159 st->codecpar->sample_rate = var_read_int(pb, size);
160 avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
161 } else if (!strcmp(name, "SAMPLE_WIDTH")) {
162 st->codecpar->bits_per_coded_sample = var_read_int(pb, size) * 8;
163 } else
164 return AVERROR_INVALIDDATA;
165
166 return 0;
167}
168
169/**
170 * Parse video variable
171 * @return < 0 if unknown
172 */
173static int parse_video_var(AVFormatContext *avctx, AVStream *st,
174 const char *name, int size)
175{
176 AVIOContext *pb = avctx->pb;
177 if (!strcmp(name, "__DIR_COUNT")) {
178 st->nb_frames = st->duration = var_read_int(pb, size);
179 } else if (!strcmp(name, "COMPRESSION")) {
180 char *str = var_read_string(pb, size);
181 if (!str)
182 return AVERROR_INVALIDDATA;
183 if (!strcmp(str, "1")) {
184 st->codecpar->codec_id = AV_CODEC_ID_MVC1;
185 } else if (!strcmp(str, "2")) {
186 st->codecpar->format = AV_PIX_FMT_ABGR;
187 st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
188 } else if (!strcmp(str, "3")) {
189 st->codecpar->codec_id = AV_CODEC_ID_SGIRLE;
190 } else if (!strcmp(str, "10")) {
191 st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
192 } else if (!strcmp(str, "MVC2")) {
193 st->codecpar->codec_id = AV_CODEC_ID_MVC2;
194 } else {
195 avpriv_request_sample(avctx, "Video compression %s", str);
196 }
197 av_free(str);
198 } else if (!strcmp(name, "FPS")) {
199 AVRational fps = var_read_float(pb, size);
200 avpriv_set_pts_info(st, 64, fps.den, fps.num);
201 st->avg_frame_rate = fps;
202 } else if (!strcmp(name, "HEIGHT")) {
203 st->codecpar->height = var_read_int(pb, size);
204 } else if (!strcmp(name, "PIXEL_ASPECT")) {
205 st->sample_aspect_ratio = var_read_float(pb, size);
206 av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den,
207 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
208 INT_MAX);
209 } else if (!strcmp(name, "WIDTH")) {
210 st->codecpar->width = var_read_int(pb, size);
211 } else if (!strcmp(name, "ORIENTATION")) {
212 if (var_read_int(pb, size) == 1101) {
213 st->codecpar->extradata = av_strdup("BottomUp");
214 st->codecpar->extradata_size = 9;
215 }
216 } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
217 var_read_metadata(avctx, name, size);
218 } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
219 avio_skip(pb, size); // ignore
220 } else
221 return AVERROR_INVALIDDATA;
222
223 return 0;
224}
225
226static int read_table(AVFormatContext *avctx, AVStream *st,
227 int (*parse)(AVFormatContext *avctx, AVStream *st,
228 const char *name, int size))
229{
230 int count, i;
231 AVIOContext *pb = avctx->pb;
232 avio_skip(pb, 4);
233 count = avio_rb32(pb);
234 avio_skip(pb, 4);
235 for (i = 0; i < count; i++) {
236 char name[17];
237 int size;
238 avio_read(pb, name, 16);
239 name[sizeof(name) - 1] = 0;
240 size = avio_rb32(pb);
241 if (size < 0) {
242 av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
243 return AVERROR_INVALIDDATA;
244 }
245 if (parse(avctx, st, name, size) < 0) {
246 avpriv_request_sample(avctx, "Variable %s", name);
247 avio_skip(pb, size);
248 }
249 }
250 return 0;
251}
252
253static void read_index(AVIOContext *pb, AVStream *st)
254{
255 uint64_t timestamp = 0;
256 int i;
257 for (i = 0; i < st->nb_frames; i++) {
258 uint32_t pos = avio_rb32(pb);
259 uint32_t size = avio_rb32(pb);
260 avio_skip(pb, 8);
261 av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
262 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
263 timestamp += size / (st->codecpar->channels * 2);
264 } else {
265 timestamp++;
266 }
267 }
268}
269
270static int mv_read_header(AVFormatContext *avctx)
271{
272 MvContext *mv = avctx->priv_data;
273 AVIOContext *pb = avctx->pb;
274 AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
275 int version, i;
276 int ret;
277
278 avio_skip(pb, 4);
279
280 version = avio_rb16(pb);
281 if (version == 2) {
282 uint64_t timestamp;
283 int v;
284 avio_skip(pb, 22);
285
286 /* allocate audio track first to prevent unnecessary seeking
287 * (audio packet always precede video packet for a given frame) */
288 ast = avformat_new_stream(avctx, NULL);
289 if (!ast)
290 return AVERROR(ENOMEM);
291
292 vst = avformat_new_stream(avctx, NULL);
293 if (!vst)
294 return AVERROR(ENOMEM);
295 avpriv_set_pts_info(vst, 64, 1, 15);
296 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
297 vst->avg_frame_rate = av_inv_q(vst->time_base);
298 vst->nb_frames = avio_rb32(pb);
299 v = avio_rb32(pb);
300 switch (v) {
301 case 1:
302 vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
303 break;
304 case 2:
305 vst->codecpar->format = AV_PIX_FMT_ARGB;
306 vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
307 break;
308 default:
309 avpriv_request_sample(avctx, "Video compression %i", v);
310 break;
311 }
312 vst->codecpar->codec_tag = 0;
313 vst->codecpar->width = avio_rb32(pb);
314 vst->codecpar->height = avio_rb32(pb);
315 avio_skip(pb, 12);
316
317 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
318 ast->nb_frames = vst->nb_frames;
319 ast->codecpar->sample_rate = avio_rb32(pb);
320 if (ast->codecpar->sample_rate <= 0) {
321 av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
322 return AVERROR_INVALIDDATA;
323 }
324 avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
325 if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
326 return AVERROR_INVALIDDATA;
327
328 v = avio_rb32(pb);
329 if (v == AUDIO_FORMAT_SIGNED) {
330 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
331 } else {
332 avpriv_request_sample(avctx, "Audio compression (format %i)", v);
333 }
334
335 avio_skip(pb, 12);
336 var_read_metadata(avctx, "title", 0x80);
337 var_read_metadata(avctx, "comment", 0x100);
338 avio_skip(pb, 0x80);
339
340 timestamp = 0;
341 for (i = 0; i < vst->nb_frames; i++) {
342 uint32_t pos = avio_rb32(pb);
343 uint32_t asize = avio_rb32(pb);
344 uint32_t vsize = avio_rb32(pb);
345 avio_skip(pb, 8);
346 av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
347 av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
348 timestamp += asize / (ast->codecpar->channels * 2);
349 }
350 } else if (!version && avio_rb16(pb) == 3) {
351 avio_skip(pb, 4);
352
353 if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
354 return ret;
355
356 if (mv->nb_audio_tracks > 1) {
357 avpriv_request_sample(avctx, "Multiple audio streams support");
358 return AVERROR_PATCHWELCOME;
359 } else if (mv->nb_audio_tracks) {
360 ast = avformat_new_stream(avctx, NULL);
361 if (!ast)
362 return AVERROR(ENOMEM);
363 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
364 if ((read_table(avctx, ast, parse_audio_var)) < 0)
365 return ret;
366 if (mv->acompression == 100 &&
367 mv->aformat == AUDIO_FORMAT_SIGNED &&
368 ast->codecpar->bits_per_coded_sample == 16) {
369 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
370 } else {
371 avpriv_request_sample(avctx,
372 "Audio compression %i (format %i, sr %i)",
373 mv->acompression, mv->aformat,
374 ast->codecpar->bits_per_coded_sample);
375 ast->codecpar->codec_id = AV_CODEC_ID_NONE;
376 }
377 if (ast->codecpar->channels <= 0) {
378 av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
379 return AVERROR_INVALIDDATA;
380 }
381 }
382
383 if (mv->nb_video_tracks > 1) {
384 avpriv_request_sample(avctx, "Multiple video streams support");
385 return AVERROR_PATCHWELCOME;
386 } else if (mv->nb_video_tracks) {
387 vst = avformat_new_stream(avctx, NULL);
388 if (!vst)
389 return AVERROR(ENOMEM);
390 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
391 if ((ret = read_table(avctx, vst, parse_video_var))<0)
392 return ret;
393 }
394
395 if (mv->nb_audio_tracks)
396 read_index(pb, ast);
397
398 if (mv->nb_video_tracks)
399 read_index(pb, vst);
400 } else {
401 avpriv_request_sample(avctx, "Version %i", version);
402 return AVERROR_PATCHWELCOME;
403 }
404
405 return 0;
406}
407
408static int mv_read_packet(AVFormatContext *avctx, AVPacket *pkt)
409{
410 MvContext *mv = avctx->priv_data;
411 AVIOContext *pb = avctx->pb;
412 AVStream *st = avctx->streams[mv->stream_index];
413 const AVIndexEntry *index;
414 int frame = mv->frame[mv->stream_index];
415 int64_t ret;
416 uint64_t pos;
417
418 if (frame < st->nb_index_entries) {
419 index = &st->index_entries[frame];
420 pos = avio_tell(pb);
421 if (index->pos > pos)
422 avio_skip(pb, index->pos - pos);
423 else if (index->pos < pos) {
424 if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
425 return AVERROR(EIO);
426 ret = avio_seek(pb, index->pos, SEEK_SET);
427 if (ret < 0)
428 return ret;
429 }
430 ret = av_get_packet(pb, pkt, index->size);
431 if (ret < 0)
432 return ret;
433
434 pkt->stream_index = mv->stream_index;
435 pkt->pts = index->timestamp;
436 pkt->flags |= AV_PKT_FLAG_KEY;
437
438 mv->frame[mv->stream_index]++;
439 mv->eof_count = 0;
440 } else {
441 mv->eof_count++;
442 if (mv->eof_count >= avctx->nb_streams)
443 return AVERROR_EOF;
444
445 // avoid returning 0 without a packet
446 return AVERROR(EAGAIN);
447 }
448
449 mv->stream_index++;
450 if (mv->stream_index >= avctx->nb_streams)
451 mv->stream_index = 0;
452
453 return 0;
454}
455
456static int mv_read_seek(AVFormatContext *avctx, int stream_index,
457 int64_t timestamp, int flags)
458{
459 MvContext *mv = avctx->priv_data;
460 AVStream *st = avctx->streams[stream_index];
461 int frame, i;
462
463 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
464 return AVERROR(ENOSYS);
465
466 if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
467 return AVERROR(EIO);
468
469 frame = av_index_search_timestamp(st, timestamp, flags);
470 if (frame < 0)
471 return AVERROR_INVALIDDATA;
472
473 for (i = 0; i < avctx->nb_streams; i++)
474 mv->frame[i] = frame;
475 return 0;
476}
477
478AVInputFormat ff_mv_demuxer = {
479 .name = "mv",
480 .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
481 .priv_data_size = sizeof(MvContext),
482 .read_probe = mv_probe,
483 .read_header = mv_read_header,
484 .read_packet = mv_read_packet,
485 .read_seek = mv_read_seek,
486};
487
generated by cgit at 2024-05-17 18:52:12 (GMT)