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https://github.com/FFmpeg/FFmpeg.git
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initial duration/start_time generic support - displays stream duration and average total bitrate when using an input file
Originally committed as revision 2115 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
5b685a7a76
commit
12f996edfa
@ -321,6 +321,8 @@ int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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err = AVERROR_NOMEM;
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goto fail;
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}
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ic->duration = AV_NOPTS_VALUE;
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ic->start_time = AV_NOPTS_VALUE;
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pstrcpy(ic->filename, sizeof(ic->filename), filename);
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pd->filename = ic->filename;
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pd->buf = buf;
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@ -439,6 +441,295 @@ int av_read_packet(AVFormatContext *s, AVPacket *pkt)
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}
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}
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/* return TRUE if the stream has accurate timings for at least one component */
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static int av_has_timings(AVFormatContext *ic)
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{
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int i;
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AVStream *st;
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for(i = 0;i < ic->nb_streams; i++) {
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st = ic->streams[i];
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if (st->start_time != AV_NOPTS_VALUE &&
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st->duration != AV_NOPTS_VALUE)
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return 1;
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}
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return 0;
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}
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/* estimate the stream timings from the one of each components. Also
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compute the global bitrate if possible */
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static void av_update_stream_timings(AVFormatContext *ic)
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{
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int64_t start_time, end_time, end_time1;
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int i;
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AVStream *st;
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start_time = MAXINT64;
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end_time = MININT64;
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for(i = 0;i < ic->nb_streams; i++) {
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st = ic->streams[i];
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if (st->start_time != AV_NOPTS_VALUE) {
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if (st->start_time < start_time)
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start_time = st->start_time;
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if (st->duration != AV_NOPTS_VALUE) {
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end_time1 = st->start_time + st->duration;
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if (end_time1 > end_time)
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end_time = end_time1;
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}
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}
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}
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if (start_time != MAXINT64) {
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ic->start_time = start_time;
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if (end_time != MAXINT64) {
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ic->duration = end_time - start_time;
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if (ic->file_size > 0) {
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/* compute the bit rate */
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ic->bit_rate = (double)ic->file_size * 8.0 * AV_TIME_BASE /
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(double)ic->duration;
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}
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}
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}
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}
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static void fill_all_stream_timings(AVFormatContext *ic)
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{
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int i;
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AVStream *st;
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av_update_stream_timings(ic);
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for(i = 0;i < ic->nb_streams; i++) {
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st = ic->streams[i];
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if (st->start_time == AV_NOPTS_VALUE) {
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st->start_time = ic->start_time;
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st->duration = ic->duration;
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}
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}
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}
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static void av_estimate_timings_from_bit_rate(AVFormatContext *ic)
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{
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int64_t filesize, duration;
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int bit_rate, i;
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AVStream *st;
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/* if bit_rate is already set, we believe it */
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if (ic->bit_rate == 0) {
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bit_rate = 0;
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for(i=0;i<ic->nb_streams;i++) {
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st = ic->streams[i];
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bit_rate += st->codec.bit_rate;
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}
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ic->bit_rate = bit_rate;
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}
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/* if duration is already set, we believe it */
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if (ic->duration == AV_NOPTS_VALUE &&
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ic->bit_rate != 0 &&
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ic->file_size != 0) {
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filesize = ic->file_size;
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if (filesize > 0) {
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duration = (int64_t)((8 * AV_TIME_BASE * (double)filesize) / (double)ic->bit_rate);
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for(i = 0; i < ic->nb_streams; i++) {
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st = ic->streams[i];
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if (st->start_time == AV_NOPTS_VALUE ||
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st->duration == AV_NOPTS_VALUE) {
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st->start_time = 0;
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st->duration = duration;
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}
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}
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}
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}
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}
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static void flush_packet_queue(AVFormatContext *s)
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{
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AVPacketList *pktl;
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for(;;) {
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pktl = s->packet_buffer;
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if (!pktl)
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break;
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s->packet_buffer = pktl->next;
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av_free(pktl);
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}
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}
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#define DURATION_MAX_READ_SIZE 250000
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/* only usable for MPEG-PS streams */
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static void av_estimate_timings_from_pts(AVFormatContext *ic)
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{
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AVPacket pkt1, *pkt = &pkt1;
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AVStream *st;
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int read_size, i, ret;
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int64_t start_time, end_time, end_time1;
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int64_t filesize, offset, duration;
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/* we read the first packets to get the first PTS (not fully
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accurate, but it is enough now) */
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url_fseek(&ic->pb, 0, SEEK_SET);
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read_size = 0;
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for(;;) {
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if (read_size >= DURATION_MAX_READ_SIZE)
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break;
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/* if all info is available, we can stop */
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for(i = 0;i < ic->nb_streams; i++) {
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st = ic->streams[i];
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if (st->start_time == AV_NOPTS_VALUE)
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break;
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}
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if (i == ic->nb_streams)
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break;
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ret = av_read_packet(ic, pkt);
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if (ret != 0)
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break;
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read_size += pkt->size;
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st = ic->streams[pkt->stream_index];
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if (pkt->pts != AV_NOPTS_VALUE) {
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if (st->start_time == AV_NOPTS_VALUE)
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st->start_time = (int64_t)((double)pkt->pts * ic->pts_num * (double)AV_TIME_BASE / ic->pts_den);
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}
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av_free_packet(pkt);
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}
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/* we compute the minimum start_time and use it as default */
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start_time = MAXINT64;
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for(i = 0; i < ic->nb_streams; i++) {
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st = ic->streams[i];
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if (st->start_time != AV_NOPTS_VALUE &&
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st->start_time < start_time)
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start_time = st->start_time;
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}
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printf("start=%lld\n", start_time);
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if (start_time != MAXINT64)
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ic->start_time = start_time;
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/* estimate the end time (duration) */
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/* XXX: may need to support wrapping */
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filesize = ic->file_size;
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offset = filesize - DURATION_MAX_READ_SIZE;
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if (offset < 0)
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offset = 0;
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/* flush packet queue */
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flush_packet_queue(ic);
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url_fseek(&ic->pb, offset, SEEK_SET);
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read_size = 0;
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for(;;) {
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if (read_size >= DURATION_MAX_READ_SIZE)
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break;
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/* if all info is available, we can stop */
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for(i = 0;i < ic->nb_streams; i++) {
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st = ic->streams[i];
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if (st->duration == AV_NOPTS_VALUE)
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break;
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}
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if (i == ic->nb_streams)
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break;
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ret = av_read_packet(ic, pkt);
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if (ret != 0)
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break;
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read_size += pkt->size;
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st = ic->streams[pkt->stream_index];
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if (pkt->pts != AV_NOPTS_VALUE) {
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end_time = (int64_t)((double)pkt->pts * ic->pts_num * (double)AV_TIME_BASE / ic->pts_den);
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duration = end_time - st->start_time;
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if (duration > 0) {
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if (st->duration == AV_NOPTS_VALUE ||
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st->duration < duration)
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st->duration = duration;
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}
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}
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av_free_packet(pkt);
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}
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/* estimate total duration */
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end_time = MININT64;
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for(i = 0;i < ic->nb_streams; i++) {
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st = ic->streams[i];
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if (st->duration != AV_NOPTS_VALUE) {
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end_time1 = st->start_time + st->duration;
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if (end_time1 > end_time)
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end_time = end_time1;
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}
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}
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/* update start_time (new stream may have been created, so we do
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it at the end */
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if (ic->start_time != AV_NOPTS_VALUE) {
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for(i = 0; i < ic->nb_streams; i++) {
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st = ic->streams[i];
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if (st->start_time == AV_NOPTS_VALUE)
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st->start_time = ic->start_time;
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}
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}
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if (end_time != MININT64) {
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/* put dummy values for duration if needed */
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for(i = 0;i < ic->nb_streams; i++) {
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st = ic->streams[i];
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if (st->duration == AV_NOPTS_VALUE &&
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st->start_time != AV_NOPTS_VALUE)
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st->duration = end_time - st->start_time;
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}
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ic->duration = end_time - ic->start_time;
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}
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url_fseek(&ic->pb, 0, SEEK_SET);
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}
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static void av_estimate_timings(AVFormatContext *ic)
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{
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URLContext *h;
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int64_t file_size;
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/* get the file size, if possible */
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if (ic->iformat->flags & AVFMT_NOFILE) {
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file_size = 0;
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} else {
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h = url_fileno(&ic->pb);
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file_size = url_filesize(h);
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if (file_size < 0)
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file_size = 0;
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}
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ic->file_size = file_size;
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if (ic->iformat == &mpegps_demux) {
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/* get accurate estimate from the PTSes */
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av_estimate_timings_from_pts(ic);
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} else if (av_has_timings(ic)) {
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/* at least one components has timings - we use them for all
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the components */
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fill_all_stream_timings(ic);
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} else {
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/* less precise: use bit rate info */
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av_estimate_timings_from_bit_rate(ic);
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}
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av_update_stream_timings(ic);
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#if 0
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{
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int i;
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AVStream *st;
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for(i = 0;i < ic->nb_streams; i++) {
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st = ic->streams[i];
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printf("%d: start_time: %0.3f duration: %0.3f\n",
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i, (double)st->start_time / AV_TIME_BASE,
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(double)st->duration / AV_TIME_BASE);
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}
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printf("stream: start_time: %0.3f duration: %0.3f bitrate=%d kb/s\n",
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(double)ic->start_time / AV_TIME_BASE,
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(double)ic->duration / AV_TIME_BASE,
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ic->bit_rate / 1000);
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}
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#endif
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}
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/* state for codec information */
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#define CSTATE_NOTFOUND 0
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#define CSTATE_DECODING 1
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@ -662,6 +953,8 @@ int av_find_stream_info(AVFormatContext *ic)
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}
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}
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av_estimate_timings(ic);
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return ret;
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}
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@ -725,6 +1018,8 @@ AVStream *av_new_stream(AVFormatContext *s, int id)
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st->index = s->nb_streams;
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st->id = id;
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st->start_time = AV_NOPTS_VALUE;
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st->duration = AV_NOPTS_VALUE;
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s->streams[s->nb_streams++] = st;
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return st;
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}
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@ -874,6 +1169,29 @@ void dump_format(AVFormatContext *ic,
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index,
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is_output ? ic->oformat->name : ic->iformat->name,
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is_output ? "to" : "from", url);
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if (!is_output) {
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printf(" Duration: ");
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if (ic->duration != AV_NOPTS_VALUE) {
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int hours, mins, secs, us;
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secs = ic->duration / AV_TIME_BASE;
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us = ic->duration % AV_TIME_BASE;
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mins = secs / 60;
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secs %= 60;
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hours = mins / 60;
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mins %= 60;
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printf("%02d:%02d:%02d.%01d", hours, mins, secs,
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(10 * us) / AV_TIME_BASE);
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} else {
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printf("N/A");
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}
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printf(", bitrate: ");
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if (ic->bit_rate) {
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printf("%d kb/s", ic->bit_rate / 1000);
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} else {
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printf("N/A");
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}
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printf("\n");
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}
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for(i=0;i<ic->nb_streams;i++) {
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AVStream *st = ic->streams[i];
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avcodec_string(buf, sizeof(buf), &st->codec, is_output);
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