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From c57e5b8154f5fe1457f4c64e04885a2cdfb37f51 Mon Sep 17 00:00:00 2001
From: Joakim Plate <elupus@ecce.se>
Date: Sat, 22 Oct 2011 19:01:38 +0200
Subject: [PATCH 08/13] Get stream durations using read_timestamp
Patch part of the XBMC patch set for ffmpeg, downloaded from
https://github.com/xbmc/FFmpeg/.
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
libavformat/utils.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 3e8af50..f4fb172 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2356,6 +2356,41 @@ static void estimate_timings_from_bit_rate(AVFormatContext *ic)
#define DURATION_MAX_READ_SIZE 250000LL
#define DURATION_MAX_RETRY 4
+static void av_estimate_timings_from_pts2(AVFormatContext *ic, int64_t old_offset)
+{
+ AVStream *st;
+ int i, step= 1024;
+ int64_t ts, pos;
+
+ for(i=0;i<ic->nb_streams;i++) {
+ st = ic->streams[i];
+
+ pos = 0;
+ ts = ic->iformat->read_timestamp(ic, i, &pos, DURATION_MAX_READ_SIZE);
+ if (ts == AV_NOPTS_VALUE)
+ continue;
+ if (st->start_time > ts || st->start_time == AV_NOPTS_VALUE)
+ st->start_time = ts;
+
+ pos = avio_size(ic->pb) - 1;
+ do {
+ pos -= step;
+ ts = ic->iformat->read_timestamp(ic, i, &pos, pos + step);
+ step += step;
+ } while (ts == AV_NOPTS_VALUE && pos >= step && step < DURATION_MAX_READ_SIZE);
+
+ if (ts == AV_NOPTS_VALUE)
+ continue;
+
+ if (st->duration < ts - st->start_time || st->duration == AV_NOPTS_VALUE)
+ st->duration = ts - st->start_time;
+ }
+
+ fill_all_stream_timings(ic);
+
+ avio_seek(ic->pb, old_offset, SEEK_SET);
+}
+
/* only usable for MPEG-PS streams */
static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset)
{
@@ -2506,6 +2541,10 @@ static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
* the components */
fill_all_stream_timings(ic);
ic->duration_estimation_method = AVFMT_DURATION_FROM_STREAM;
+ } else if (ic->iformat->read_timestamp &&
+ file_size && ic->pb->seekable) {
+ /* get accurate estimate from the PTSes */
+ av_estimate_timings_from_pts2(ic, old_offset);
} else {
/* less precise: use bitrate info */
estimate_timings_from_bit_rate(ic);
--
2.1.0
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