From bb917533ad5beaded24ed56c7c4dc71d50e76263 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Thu, 11 Jul 2013 13:12:43 +0100
Subject: Untested audio delay.

---
 src/lib/audio_decoder.cc   | 8 +++++++-
 src/lib/audio_decoder.h    | 5 ++++-
 src/lib/ffmpeg_decoder.cc  | 2 +-
 src/lib/sndfile_decoder.cc | 2 +-
 4 files changed, 13 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/lib/audio_decoder.cc b/src/lib/audio_decoder.cc
index ade11cc32..2fe347cf2 100644
--- a/src/lib/audio_decoder.cc
+++ b/src/lib/audio_decoder.cc
@@ -31,15 +31,21 @@ using std::cout;
 using boost::optional;
 using boost::shared_ptr;
 
-AudioDecoder::AudioDecoder (shared_ptr<const Film> f)
+AudioDecoder::AudioDecoder (shared_ptr<const Film> f, shared_ptr<const AudioContent> c)
 	: Decoder (f)
 	, _audio_position (0)
 {
+	_delay_frames = c->audio_delay() * c->content_audio_frame_rate() * f->dcp_audio_frame_rate() / (c->output_audio_frame_rate() * 1000);
 }
 
 void
 AudioDecoder::audio (shared_ptr<const AudioBuffers> data, AudioContent::Frame frame)
 {
+	frame += _delay_frames;
+	
 	Audio (data, frame);
 	_audio_position = frame + data->frames ();
+	if (_audio_position < 0) {
+		_audio_position = 0;
+	}
 }
diff --git a/src/lib/audio_decoder.h b/src/lib/audio_decoder.h
index ddfb296c9..a7849b9cc 100644
--- a/src/lib/audio_decoder.h
+++ b/src/lib/audio_decoder.h
@@ -35,7 +35,7 @@ class AudioBuffers;
 class AudioDecoder : public virtual Decoder
 {
 public:
-	AudioDecoder (boost::shared_ptr<const Film>);
+	AudioDecoder (boost::shared_ptr<const Film>, boost::shared_ptr<const AudioContent>);
 
 	/** Emitted when some audio data is ready */
 	boost::signals2::signal<void (boost::shared_ptr<const AudioBuffers>, AudioContent::Frame)> Audio;
@@ -44,6 +44,9 @@ protected:
 
 	void audio (boost::shared_ptr<const AudioBuffers>, AudioContent::Frame);
 	AudioContent::Frame _audio_position;
+
+private:
+	AudioContent::Frame _delay_frames;
 };
 
 #endif
diff --git a/src/lib/ffmpeg_decoder.cc b/src/lib/ffmpeg_decoder.cc
index fddb70294..b2eb1dbde 100644
--- a/src/lib/ffmpeg_decoder.cc
+++ b/src/lib/ffmpeg_decoder.cc
@@ -59,7 +59,7 @@ using libdcp::Size;
 FFmpegDecoder::FFmpegDecoder (shared_ptr<const Film> f, shared_ptr<const FFmpegContent> c, bool video, bool audio)
 	: Decoder (f)
 	, VideoDecoder (f)
-	, AudioDecoder (f)
+	, AudioDecoder (f, c)
 	, SubtitleDecoder (f)
 	, FFmpeg (c)
 	, _subtitle_codec_context (0)
diff --git a/src/lib/sndfile_decoder.cc b/src/lib/sndfile_decoder.cc
index 80a6afd2b..b2ad45125 100644
--- a/src/lib/sndfile_decoder.cc
+++ b/src/lib/sndfile_decoder.cc
@@ -35,7 +35,7 @@ using boost::shared_ptr;
 
 SndfileDecoder::SndfileDecoder (shared_ptr<const Film> f, shared_ptr<const SndfileContent> c)
 	: Decoder (f)
-	, AudioDecoder (f)
+	, AudioDecoder (f, c)
 	, _sndfile_content (c)
 	, _deinterleave_buffer (0)
 {
-- 
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