/*
- Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
}
#include "ffmpeg_examiner.h"
#include "ffmpeg_content.h"
+#include "ffmpeg_audio_stream.h"
+#include "ffmpeg_subtitle_stream.h"
+#include "util.h"
+
+#include "i18n.h"
using std::string;
+using std::cout;
+using std::max;
using std::stringstream;
using boost::shared_ptr;
+using boost::optional;
FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c)
: FFmpeg (c)
_audio_streams.push_back (
shared_ptr<FFmpegAudioStream> (
- new FFmpegAudioStream (stream_name (s), i, s->codec->sample_rate, s->codec->channels)
+ new FFmpegAudioStream (audio_stream_name (s), s->id, s->codec->sample_rate, s->codec->channels)
)
);
} else if (s->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
- _subtitle_streams.push_back (shared_ptr<FFmpegSubtitleStream> (new FFmpegSubtitleStream (stream_name (s), i)));
+ _subtitle_streams.push_back (shared_ptr<FFmpegSubtitleStream> (new FFmpegSubtitleStream (subtitle_stream_name (s), s->id)));
}
}
+ /* Run through until we find:
+ * - the first video.
+ * - the first audio for each stream.
+ * - the subtitle periods for each stream.
+ *
+ * We have to note subtitle periods as otherwise we have no way of knowing
+ * where we should look for subtitles (video and audio are always present,
+ * so they are ok).
+ */
+ while (1) {
+ int r = av_read_frame (_format_context, &_packet);
+ if (r < 0) {
+ break;
+ }
+
+ AVCodecContext* context = _format_context->streams[_packet.stream_index]->codec;
+
+ if (_packet.stream_index == _video_stream) {
+ video_packet (context);
+ }
+
+ for (size_t i = 0; i < _audio_streams.size(); ++i) {
+ if (_audio_streams[i]->uses_index (_format_context, _packet.stream_index)) {
+ audio_packet (context, _audio_streams[i]);
+ }
+ }
+
+ for (size_t i = 0; i < _subtitle_streams.size(); ++i) {
+ if (_subtitle_streams[i]->uses_index (_format_context, _packet.stream_index)) {
+ subtitle_packet (context, _subtitle_streams[i]);
+ }
+ }
+
+ av_free_packet (&_packet);
+ }
}
-float
-FFmpegExaminer::video_frame_rate () const
+void
+FFmpegExaminer::video_packet (AVCodecContext* context)
{
- AVStream* s = _format_context->streams[_video_stream];
+ if (_first_video) {
+ return;
+ }
- if (s->avg_frame_rate.num && s->avg_frame_rate.den) {
- return av_q2d (s->avg_frame_rate);
+ int frame_finished;
+ if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
+ _first_video = frame_time (_format_context->streams[_video_stream]);
+ }
+}
+
+void
+FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStream> stream)
+{
+ if (stream->first_audio) {
+ return;
+ }
+
+ int frame_finished;
+ if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
+ stream->first_audio = frame_time (stream->stream (_format_context));
+ }
+}
+
+void
+FFmpegExaminer::subtitle_packet (AVCodecContext* context, shared_ptr<FFmpegSubtitleStream> stream)
+{
+ int frame_finished;
+ AVSubtitle sub;
+ if (avcodec_decode_subtitle2 (context, &sub, &frame_finished, &_packet) >= 0 && frame_finished) {
+ ContentTimePeriod const period = subtitle_period (sub);
+ if (sub.num_rects == 0 && !stream->periods.empty () && stream->periods.back().to > period.from) {
+ /* Finish the last subtitle */
+ stream->periods.back().to = period.from;
+ } else if (sub.num_rects == 1) {
+ stream->periods.push_back (period);
+ }
+ }
+}
+
+optional<ContentTime>
+FFmpegExaminer::frame_time (AVStream* s) const
+{
+ optional<ContentTime> t;
+
+ int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
+ if (bet != AV_NOPTS_VALUE) {
+ t = ContentTime::from_seconds (bet * av_q2d (s->time_base));
}
- return av_q2d (s->r_frame_rate);
+ return t;
}
-libdcp::Size
+float
+FFmpegExaminer::video_frame_rate () const
+{
+ /* This use of r_frame_rate is debateable; there's a few different
+ * frame rates in the format context, but this one seems to be the most
+ * reliable.
+ */
+ return av_q2d (av_stream_get_r_frame_rate (_format_context->streams[_video_stream]));
+}
+
+dcp::Size
FFmpegExaminer::video_size () const
{
- return libdcp::Size (_video_codec_context->width, _video_codec_context->height);
+ return dcp::Size (video_codec_context()->width, video_codec_context()->height);
}
-/** @return Length (in video frames) according to our content's header */
-ContentVideoFrame
+/** @return Length according to our content's header */
+ContentTime
FFmpegExaminer::video_length () const
{
- return (double (_format_context->duration) / AV_TIME_BASE) * video_frame_rate();
+ ContentTime const length = ContentTime::from_seconds (double (_format_context->duration - _format_context->start_time) / AV_TIME_BASE);
+ return ContentTime (max (int64_t (1), length.get ()));
+}
+
+string
+FFmpegExaminer::audio_stream_name (AVStream* s) const
+{
+ stringstream n;
+
+ n << stream_name (s);
+
+ if (!n.str().empty()) {
+ n << "; ";
+ }
+
+ n << s->codec->channels << " channels";
+
+ return n.str ();
+}
+
+string
+FFmpegExaminer::subtitle_stream_name (AVStream* s) const
+{
+ stringstream n;
+
+ n << stream_name (s);
+
+ if (n.str().empty()) {
+ n << _("unknown");
+ }
+
+ return n.str ();
}
string
}
}
- if (n.str().empty()) {
- n << "unknown";
- }
-
return n.str ();
}
projects / dcpomatic.git / blobdiff