/*
- Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+ Copyright (C) 2013-2015 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 "job.h"
+#include "ffmpeg_audio_stream.h"
+#include "ffmpeg_subtitle_stream.h"
+#include "util.h"
+#include "safe_stringstream.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)
+/** @param job job that the examiner is operating in, or 0 */
+FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Job> job)
: FFmpeg (c)
+ , _need_video_length (false)
{
/* Find audio and subtitle streams */
}
}
- /* Run through until we find the first audio (for each stream) and video */
+ /* See if the header has duration information in it */
+ _need_video_length = _format_context->duration == AV_NOPTS_VALUE;
+ if (!_need_video_length) {
+ _video_length = ContentTime::from_seconds (double (_format_context->duration) / AV_TIME_BASE);
+ } else if (job) {
+ job->sub (_("Finding length"));
+ job->set_progress_unknown ();
+ }
- while (1) {
+ /* 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 (true) {
int r = av_read_frame (_format_context, &_packet);
if (r < 0) {
break;
}
- int frame_finished;
-
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]->index (_format_context) && !_audio_streams[i]->first_audio) {
- if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
- _audio_streams[i]->first_audio = frame_time (_audio_streams[i]->index (_format_context));
- }
- }
+ 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]);
}
}
- bool have_all_audio = true;
- size_t i = 0;
- while (i < _audio_streams.size() && have_all_audio) {
- have_all_audio = _audio_streams[i]->first_audio;
- ++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);
-
- if (_first_video && have_all_audio) {
- break;
+ }
+}
+
+void
+FFmpegExaminer::video_packet (AVCodecContext* context)
+{
+ if (_first_video && !_need_video_length) {
+ return;
+ }
+
+ int frame_finished;
+ if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
+ if (!_first_video) {
+ _first_video = frame_time (_format_context->streams[_video_stream]);
+ }
+ if (_need_video_length) {
+ _video_length = frame_time (_format_context->streams[_video_stream]).get_value_or (ContentTime ());
}
}
}
-optional<double>
-FFmpegExaminer::frame_time (int stream) const
+void
+FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStream> stream)
{
- optional<double> t;
+ 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 = bet * av_q2d (_format_context->streams[stream]->time_base);
+ t = ContentTime::from_seconds (bet * av_q2d (s->time_base));
}
return t;
}
-float
+optional<float>
FFmpegExaminer::video_frame_rate () const
{
- AVStream* s = _format_context->streams[_video_stream];
-
- if (s->avg_frame_rate.num && s->avg_frame_rate.den) {
- return av_q2d (s->avg_frame_rate);
- }
-
- return av_q2d (s->r_frame_rate);
+ /* 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]));
}
-libdcp::Size
+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 */
-VideoFrame
+/** @return Length according to our content's header */
+ContentTime
FFmpegExaminer::video_length () const
{
- VideoFrame const length = (double (_format_context->duration) / AV_TIME_BASE) * video_frame_rate();
- return max (1, length);
+ ContentTime const length = ContentTime::from_seconds (double (_format_context->duration) / AV_TIME_BASE);
+ return ContentTime (max (ContentTime (1), _video_length));
+}
+
+optional<float>
+FFmpegExaminer::sample_aspect_ratio () const
+{
+ AVRational sar = av_guess_sample_aspect_ratio (_format_context, _format_context->streams[_video_stream], 0);
+ if (sar.num == 0) {
+ /* I assume this means that we don't know */
+ return optional<float> ();
+ }
+ return float (sar.num) / sar.den;
}
string
FFmpegExaminer::audio_stream_name (AVStream* s) const
{
- stringstream n;
+ SafeStringStream n;
n << stream_name (s);
string
FFmpegExaminer::subtitle_stream_name (AVStream* s) const
{
- stringstream n;
+ SafeStringStream n;
n << stream_name (s);
string
FFmpegExaminer::stream_name (AVStream* s) const
{
- stringstream n;
+ SafeStringStream n;
if (s->metadata) {
AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);
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