Basics of FFmpeg examiner works.

[dcpomatic.git] / src / lib / ffmpeg_examiner.cc

diff --git a/src/lib/ffmpeg_examiner.cc b/src/lib/ffmpeg_examiner.cc
index e5d356a27b7b213ffeaaa2a04f6e09f9c168ca94..c09395e76609086f33579b63b18c008cf4cc3744 100644 (file)
--- a/src/lib/ffmpeg_examiner.cc
+++ b/src/lib/ffmpeg_examiner.cc
@@ -25,8 +25,10 @@ extern "C" {
 #include "ffmpeg_content.h"
 
 using std::string;
+using std::cout;
 using std::stringstream;
 using boost::shared_ptr;
+using boost::optional;
 
 FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c)
        : FFmpeg (c)
@@ -56,6 +58,61 @@ FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c)
                }
        }
 
+       /* Run through until we find the first audio (for each stream) and video */
+
+       while (1) {
+               int r = av_read_frame (_format_context, &_packet);
+               if (r < 0) {
+                       break;
+               }
+
+               int frame_finished;
+               avcodec_get_frame_defaults (_frame);
+
+               cout << "got packet " << _packet.stream_index << "\n";
+
+               AVCodecContext* context = _format_context->streams[_packet.stream_index]->codec;
+
+               if (_packet.stream_index == _video_stream && !_first_video) {
+                       if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
+                               _first_video = frame_time (_video_stream);
+                       }
+               } else {
+                       for (size_t i = 0; i < _audio_streams.size(); ++i) {
+                               if (_packet.stream_index == _audio_streams[i]->id && !_audio_streams[i]->start) {
+                                       if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
+                                               _audio_streams[i]->start = frame_time (_audio_streams[i]->id);
+                                       }
+                               }
+                       }
+               }
+
+               bool have_all_audio = true;
+               size_t i = 0;
+               while (i < _audio_streams.size() && have_all_audio) {
+                       have_all_audio = _audio_streams[i]->start;
+                       ++i;
+               }
+
+               if (_first_video && have_all_audio) {
+                       break;
+               }
+
+               av_free_packet (&_packet);
+       }
+}
+
+optional<Time>
+FFmpegExaminer::frame_time (int stream) const
+{
+       optional<Time> t;
+       
+       int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
+       if (bet != AV_NOPTS_VALUE) {
+               t = bet * av_q2d (_format_context->streams[stream]->time_base) * TIME_HZ;
+       }
+
+       return t;
 }
 
 float
@@ -73,7 +130,7 @@ FFmpegExaminer::video_frame_rate () const
 libdcp::Size
 FFmpegExaminer::video_size () const
 {
-       return libdcp::Size (_video_codec_context->width, _video_codec_context->height);
+       return libdcp::Size (video_codec_context()->width, video_codec_context()->height);
 }
 
 /** @return Length (in video frames) according to our content's header */