From df52b97f307605aad15ab5f01c8fdcf93afc9d15 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Tue, 9 Jul 2013 22:16:46 +0100
Subject: Various fixes; simplification of FilmViewer; make image appear on
 first load of content.

---
 src/lib/ffmpeg_decoder.cc | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

(limited to 'src/lib/ffmpeg_decoder.cc')

diff --git a/src/lib/ffmpeg_decoder.cc b/src/lib/ffmpeg_decoder.cc
index bf0949130..3b7d727b8 100644
--- a/src/lib/ffmpeg_decoder.cc
+++ b/src/lib/ffmpeg_decoder.cc
@@ -67,6 +67,7 @@ FFmpegDecoder::FFmpegDecoder (shared_ptr<const Film> f, shared_ptr<const FFmpegC
 	, _decode_video (video)
 	, _decode_audio (audio)
 	, _pts_offset (0)
+	, _just_sought (false)
 {
 	setup_subtitle ();
 
@@ -298,15 +299,16 @@ FFmpegDecoder::seek_back ()
 void
 FFmpegDecoder::do_seek (VideoContent::Frame frame, bool backwards, bool accurate)
 {
-	int64_t const vt = frame * _ffmpeg_content->video_frame_rate() / av_q2d (_format_context->streams[_video_stream]->time_base);
+	int64_t const vt = frame / (_ffmpeg_content->video_frame_rate() * av_q2d (_format_context->streams[_video_stream]->time_base));
 	av_seek_frame (_format_context, _video_stream, vt, backwards ? AVSEEK_FLAG_BACKWARD : 0);
-	_video_position = frame;
 
 	avcodec_flush_buffers (video_codec_context());
 	if (_subtitle_codec_context) {
 		avcodec_flush_buffers (_subtitle_codec_context);
 	}
 
+	_just_sought = true;
+
 	if (accurate) {
 		while (1) {
 			int r = av_read_frame (_format_context, &_packet);
@@ -420,6 +422,15 @@ FFmpegDecoder::decode_video_packet ()
 		if (bet != AV_NOPTS_VALUE) {
 
 			double const pts = bet * av_q2d (_format_context->streams[_video_stream]->time_base) - _pts_offset;
+
+			if (_just_sought) {
+				/* We just did a seek, so disable any attempts to correct for where we
+				   are / should be.
+				*/
+				_video_position = pts * _ffmpeg_content->video_frame_rate ();
+				_just_sought = false;
+			}
+			
 			double const next = _video_position / _ffmpeg_content->video_frame_rate();
 			double const one_frame = 1 / _ffmpeg_content->video_frame_rate ();
 			double delta = pts - next;
@@ -445,6 +456,7 @@ FFmpegDecoder::decode_video_packet ()
 				/* This PTS is within a frame of being right; emit this (otherwise it will be dropped) */
 				video (image, false, _video_position);
 			}
+				
 		} else {
 			shared_ptr<const Film> film = _film.lock ();
 			assert (film);
-- 
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