2 * Silicon Graphics Movie demuxer
3 * Copyright (c) 2012 Peter Ross
5 * This file is part of FFmpeg.
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.
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.
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
24 * Silicon Graphics Movie demuxer
27 #include "libavutil/channel_layout.h"
28 #include "libavutil/eval.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/rational.h"
35 typedef struct MvContext {
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
43 int acompression; ///< compression level for audio stream
44 int aformat; ///< audio format
47 #define AUDIO_FORMAT_SIGNED 401
49 static int mv_probe(const AVProbeData *p)
51 if (AV_RB32(p->buf) == MKBETAG('M', 'O', 'V', 'I') &&
52 AV_RB16(p->buf + 4) < 3)
53 return AVPROBE_SCORE_MAX;
57 static char *var_read_string(AVIOContext *pb, int size)
62 if (size < 0 || size == INT_MAX)
65 str = av_malloc(size + 1);
68 n = avio_get_str(pb, size, str, size + 1);
70 avio_skip(pb, size - n);
74 static int var_read_int(AVIOContext *pb, int size)
77 char *s = var_read_string(pb, size);
80 v = strtol(s, NULL, 10);
85 static AVRational var_read_float(AVIOContext *pb, int size)
88 char *s = var_read_string(pb, size);
90 return (AVRational) { 0, 0 };
91 v = av_d2q(av_strtod(s, NULL), INT_MAX);
96 static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
98 char *value = var_read_string(avctx->pb, size);
100 av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
103 static int set_channels(AVFormatContext *avctx, AVStream *st, int channels)
106 av_log(avctx, AV_LOG_ERROR, "Channel count %d invalid.\n", channels);
107 return AVERROR_INVALIDDATA;
109 st->codecpar->channels = channels;
110 st->codecpar->channel_layout = (st->codecpar->channels == 1) ? AV_CH_LAYOUT_MONO
111 : AV_CH_LAYOUT_STEREO;
116 * Parse global variable
117 * @return < 0 if unknown
119 static int parse_global_var(AVFormatContext *avctx, AVStream *st,
120 const char *name, int size)
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
134 return AVERROR_INVALIDDATA;
140 * Parse audio variable
141 * @return < 0 if unknown
143 static int parse_audio_var(AVFormatContext *avctx, AVStream *st,
144 const char *name, int size)
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;
164 return AVERROR_INVALIDDATA;
170 * Parse video variable
171 * @return < 0 if unknown
173 static int parse_video_var(AVFormatContext *avctx, AVStream *st,
174 const char *name, int size)
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);
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;
195 avpriv_request_sample(avctx, "Video compression %s", 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,
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 if (!st->codecpar->extradata)
215 return AVERROR(ENOMEM);
216 st->codecpar->extradata_size = 9;
218 } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
219 var_read_metadata(avctx, name, size);
220 } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
221 avio_skip(pb, size); // ignore
223 return AVERROR_INVALIDDATA;
228 static int read_table(AVFormatContext *avctx, AVStream *st,
229 int (*parse)(AVFormatContext *avctx, AVStream *st,
230 const char *name, int size))
235 AVIOContext *pb = avctx->pb;
237 count = avio_rb32(pb);
239 for (i = 0; i < count; i++) {
246 avio_read(pb, name, 16);
247 name[sizeof(name) - 1] = 0;
248 size = avio_rb32(pb);
250 av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
251 return AVERROR_INVALIDDATA;
253 if (parse(avctx, st, name, size) < 0) {
254 avpriv_request_sample(avctx, "Variable %s", name);
261 static void read_index(AVIOContext *pb, AVStream *st)
263 uint64_t timestamp = 0;
265 for (i = 0; i < st->nb_frames; i++) {
266 uint32_t pos = avio_rb32(pb);
267 uint32_t size = avio_rb32(pb);
269 av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
270 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
271 timestamp += size / (st->codecpar->channels * 2LL);
278 static int mv_read_header(AVFormatContext *avctx)
280 MvContext *mv = avctx->priv_data;
281 AVIOContext *pb = avctx->pb;
282 AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
288 version = avio_rb16(pb);
294 /* allocate audio track first to prevent unnecessary seeking
295 * (audio packet always precede video packet for a given frame) */
296 ast = avformat_new_stream(avctx, NULL);
298 return AVERROR(ENOMEM);
300 vst = avformat_new_stream(avctx, NULL);
302 return AVERROR(ENOMEM);
303 avpriv_set_pts_info(vst, 64, 1, 15);
304 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
305 vst->avg_frame_rate = av_inv_q(vst->time_base);
306 vst->nb_frames = avio_rb32(pb);
310 vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
313 vst->codecpar->format = AV_PIX_FMT_ARGB;
314 vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
317 avpriv_request_sample(avctx, "Video compression %i", v);
320 vst->codecpar->codec_tag = 0;
321 vst->codecpar->width = avio_rb32(pb);
322 vst->codecpar->height = avio_rb32(pb);
325 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
326 ast->nb_frames = vst->nb_frames;
327 ast->codecpar->sample_rate = avio_rb32(pb);
328 if (ast->codecpar->sample_rate <= 0) {
329 av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
330 return AVERROR_INVALIDDATA;
332 avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
333 if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
334 return AVERROR_INVALIDDATA;
337 if (v == AUDIO_FORMAT_SIGNED) {
338 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
340 avpriv_request_sample(avctx, "Audio compression (format %i)", v);
344 var_read_metadata(avctx, "title", 0x80);
345 var_read_metadata(avctx, "comment", 0x100);
349 for (i = 0; i < vst->nb_frames; i++) {
350 uint32_t pos = avio_rb32(pb);
351 uint32_t asize = avio_rb32(pb);
352 uint32_t vsize = avio_rb32(pb);
354 return AVERROR_INVALIDDATA;
356 av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
357 av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
358 timestamp += asize / (ast->codecpar->channels * 2LL);
360 } else if (!version && avio_rb16(pb) == 3) {
363 if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
366 if (mv->nb_audio_tracks < 0 || mv->nb_video_tracks < 0 ||
367 (mv->nb_audio_tracks == 0 && mv->nb_video_tracks == 0)) {
368 av_log(avctx, AV_LOG_ERROR, "Stream count is invalid.\n");
369 return AVERROR_INVALIDDATA;
372 if (mv->nb_audio_tracks > 1) {
373 avpriv_request_sample(avctx, "Multiple audio streams support");
374 return AVERROR_PATCHWELCOME;
375 } else if (mv->nb_audio_tracks) {
376 ast = avformat_new_stream(avctx, NULL);
378 return AVERROR(ENOMEM);
379 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
380 if ((read_table(avctx, ast, parse_audio_var)) < 0)
382 if (mv->acompression == 100 &&
383 mv->aformat == AUDIO_FORMAT_SIGNED &&
384 ast->codecpar->bits_per_coded_sample == 16) {
385 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
387 avpriv_request_sample(avctx,
388 "Audio compression %i (format %i, sr %i)",
389 mv->acompression, mv->aformat,
390 ast->codecpar->bits_per_coded_sample);
391 ast->codecpar->codec_id = AV_CODEC_ID_NONE;
393 if (ast->codecpar->channels <= 0) {
394 av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
395 return AVERROR_INVALIDDATA;
399 if (mv->nb_video_tracks > 1) {
400 avpriv_request_sample(avctx, "Multiple video streams support");
401 return AVERROR_PATCHWELCOME;
402 } else if (mv->nb_video_tracks) {
403 vst = avformat_new_stream(avctx, NULL);
405 return AVERROR(ENOMEM);
406 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
407 if ((ret = read_table(avctx, vst, parse_video_var))<0)
411 if (mv->nb_audio_tracks)
414 if (mv->nb_video_tracks)
417 avpriv_request_sample(avctx, "Version %i", version);
418 return AVERROR_PATCHWELCOME;
424 static int mv_read_packet(AVFormatContext *avctx, AVPacket *pkt)
426 MvContext *mv = avctx->priv_data;
427 AVIOContext *pb = avctx->pb;
428 AVStream *st = avctx->streams[mv->stream_index];
429 const AVIndexEntry *index;
430 int frame = mv->frame[mv->stream_index];
434 if (frame < st->internal->nb_index_entries) {
435 index = &st->internal->index_entries[frame];
437 if (index->pos > pos)
438 avio_skip(pb, index->pos - pos);
439 else if (index->pos < pos) {
440 if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
442 ret = avio_seek(pb, index->pos, SEEK_SET);
446 ret = av_get_packet(pb, pkt, index->size);
450 pkt->stream_index = mv->stream_index;
451 pkt->pts = index->timestamp;
452 pkt->flags |= AV_PKT_FLAG_KEY;
454 mv->frame[mv->stream_index]++;
458 if (mv->eof_count >= avctx->nb_streams)
461 // avoid returning 0 without a packet
462 return AVERROR(EAGAIN);
466 if (mv->stream_index >= avctx->nb_streams)
467 mv->stream_index = 0;
472 static int mv_read_seek(AVFormatContext *avctx, int stream_index,
473 int64_t timestamp, int flags)
475 MvContext *mv = avctx->priv_data;
476 AVStream *st = avctx->streams[stream_index];
479 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
480 return AVERROR(ENOSYS);
482 if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
485 frame = av_index_search_timestamp(st, timestamp, flags);
487 return AVERROR_INVALIDDATA;
489 for (i = 0; i < avctx->nb_streams; i++)
490 mv->frame[i] = frame;
494 AVInputFormat ff_mv_demuxer = {
496 .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
497 .priv_data_size = sizeof(MvContext),
498 .read_probe = mv_probe,
499 .read_header = mv_read_header,
500 .read_packet = mv_read_packet,
501 .read_seek = mv_read_seek,