int FFStream::load_filter(AVFrame *frame)
{
+ av_frame_unref(frame);
int ret = av_buffersrc_add_frame_flags(buffersrc_ctx,
frame, AV_BUFFERSRC_FLAG_KEEP_REF);
- if( ret < 0 ) {
- av_frame_unref(frame);
+ if( ret < 0 )
eprintf(_("av_buffersrc_add_frame_flags failed\n"));
- }
return ret;
}
int FFStream::read_frame(AVFrame *frame)
{
+ av_frame_unref(frame);
if( !filter_graph || !buffersrc_ctx || !buffersink_ctx )
return decode(frame);
if( !fframe && !(fframe=av_frame_alloc()) ) {
int FFStream::seek(int64_t no, double rate)
{
- int64_t tstmp = -INT64_MAX+1;
// default ffmpeg native seek
int npkts = 1;
int64_t pos = no, pkt_pos = -1;
}
}
if( pos == curr_pos ) return 0;
- if( pos > 0 && st->time_base.num > 0 ) {
- double secs = pos / rate;
- tstmp = secs * st->time_base.den / st->time_base.num;
- if( nudge != AV_NOPTS_VALUE ) tstmp += nudge;
- }
+ double secs = pos < 0 ? 0. : pos / rate;
+ AVRational time_base = st->time_base;
+ int64_t tstmp = time_base.num > 0 ? secs * time_base.den/time_base.num : 0;
+ if( !tstmp ) {
+ if( st->nb_index_entries > 0 ) tstmp = st->index_entries[0].timestamp;
+ else if( st->start_time != AV_NOPTS_VALUE ) tstmp = st->start_time;
+ else if( st->first_dts != AV_NOPTS_VALUE ) tstmp = st->first_dts;
+ else tstmp = INT64_MIN+1;
+ }
+ else if( nudge != AV_NOPTS_VALUE ) tstmp += nudge;
+ int idx = st->index;
+#if 0
+// seek all streams using the default timebase.
+// this is how ffmpeg and ffplay work. stream seeks are less tested.
+ tstmp = av_rescale_q(tstmp, time_base, AV_TIME_BASE_Q);
+ idx = -1;
+#endif
+
avcodec_flush_buffers(avctx);
avformat_flush(fmt_ctx);
#if 0
seek = pkt_pos;
flags = AVSEEK_FLAG_BYTE;
}
- int ret = avformat_seek_file(fmt_ctx, st->index, -INT64_MAX, seek, INT64_MAX, flags);
+ int ret = avformat_seek_file(fmt_ctx, st->index, -INT64_MAX, seek, INT64_MAX, flags);
#else
- int ret = av_seek_frame(fmt_ctx, st->index, tstmp, AVSEEK_FLAG_ANY);
+// finds the first index frame below the target time
+ int flags = AVSEEK_FLAG_BACKWARD | AVSEEK_FLAG_ANY;
+ int ret = av_seek_frame(fmt_ctx, idx, tstmp, flags);
#endif
int retry = MAX_RETRY;
while( ret >= 0 ) {
if( ret < 0 ) {
printf("** seek fail %jd, %jd\n", pos, tstmp);
seeked = need_packet = 0;
- st_eof(flushed=1);
+ st_eof(flushed=1);
return -1;
}
//printf("seeked pos = %ld, %ld\n", pos, tstmp);
init_swr(frame->channels, frame->format, frame->sample_rate);
load_history(&frame->extended_data[0], frame->nb_samples);
curr_pos += frame->nb_samples;
+ i = 0;
}
}
if( end_pos > curr_pos ) {
}
for( int i=0; ret>=0 && !flushed && curr_pos<=pos && i<MAX_RETRY; ++i ) {
ret = read_frame(frame);
- if( ret > 0 ) ++curr_pos;
+ if( ret > 0 ) { ++curr_pos; i = 0; }
}
if( frame->format == AV_PIX_FMT_NONE || frame->width <= 0 || frame->height <= 0 )
ret = -1;