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(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 st->codecpar->extradata_size = 9;
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
221 return AVERROR_INVALIDDATA;
226 static int read_table(AVFormatContext *avctx, AVStream *st,
227 int (*parse)(AVFormatContext *avctx, AVStream *st,
228 const char *name, int size))
231 AVIOContext *pb = avctx->pb;
233 count = avio_rb32(pb);
235 for (i = 0; i < count; i++) {
238 avio_read(pb, name, 16);
239 name[sizeof(name) - 1] = 0;
240 size = avio_rb32(pb);
242 av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
243 return AVERROR_INVALIDDATA;
245 if (parse(avctx, st, name, size) < 0) {
246 avpriv_request_sample(avctx, "Variable %s", name);
253 static void read_index(AVIOContext *pb, AVStream *st)
255 uint64_t timestamp = 0;
257 for (i = 0; i < st->nb_frames; i++) {
258 uint32_t pos = avio_rb32(pb);
259 uint32_t size = avio_rb32(pb);
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);
270 static int mv_read_header(AVFormatContext *avctx)
272 MvContext *mv = avctx->priv_data;
273 AVIOContext *pb = avctx->pb;
274 AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
280 version = avio_rb16(pb);
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);
290 return AVERROR(ENOMEM);
292 vst = avformat_new_stream(avctx, NULL);
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);
302 vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
305 vst->codecpar->format = AV_PIX_FMT_ARGB;
306 vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
309 avpriv_request_sample(avctx, "Video compression %i", v);
312 vst->codecpar->codec_tag = 0;
313 vst->codecpar->width = avio_rb32(pb);
314 vst->codecpar->height = avio_rb32(pb);
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;
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;
329 if (v == AUDIO_FORMAT_SIGNED) {
330 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
332 avpriv_request_sample(avctx, "Audio compression (format %i)", v);
336 var_read_metadata(avctx, "title", 0x80);
337 var_read_metadata(avctx, "comment", 0x100);
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);
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);
350 } else if (!version && avio_rb16(pb) == 3) {
353 if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
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);
362 return AVERROR(ENOMEM);
363 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
364 if ((read_table(avctx, ast, parse_audio_var)) < 0)
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;
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;
377 if (ast->codecpar->channels <= 0) {
378 av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
379 return AVERROR_INVALIDDATA;
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);
389 return AVERROR(ENOMEM);
390 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
391 if ((ret = read_table(avctx, vst, parse_video_var))<0)
395 if (mv->nb_audio_tracks)
398 if (mv->nb_video_tracks)
401 avpriv_request_sample(avctx, "Version %i", version);
402 return AVERROR_PATCHWELCOME;
408 static int mv_read_packet(AVFormatContext *avctx, AVPacket *pkt)
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];
418 if (frame < st->nb_index_entries) {
419 index = &st->index_entries[frame];
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))
426 ret = avio_seek(pb, index->pos, SEEK_SET);
430 ret = av_get_packet(pb, pkt, index->size);
434 pkt->stream_index = mv->stream_index;
435 pkt->pts = index->timestamp;
436 pkt->flags |= AV_PKT_FLAG_KEY;
438 mv->frame[mv->stream_index]++;
442 if (mv->eof_count >= avctx->nb_streams)
445 // avoid returning 0 without a packet
446 return AVERROR(EAGAIN);
450 if (mv->stream_index >= avctx->nb_streams)
451 mv->stream_index = 0;
456 static int mv_read_seek(AVFormatContext *avctx, int stream_index,
457 int64_t timestamp, int flags)
459 MvContext *mv = avctx->priv_data;
460 AVStream *st = avctx->streams[stream_index];
463 if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
464 return AVERROR(ENOSYS);
466 if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
469 frame = av_index_search_timestamp(st, timestamp, flags);
471 return AVERROR_INVALIDDATA;
473 for (i = 0; i < avctx->nb_streams; i++)
474 mv->frame[i] = frame;
478 AVInputFormat ff_mv_demuxer = {
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,