X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fffmpeg_examiner.cc;h=1d01981f60c80dd55dc19f185bc8fda2b3e0dfe0;hb=c008066160d85b9ec9e5485375d7baaa5d27bda2;hp=e439566a10367ee105f9bbc5311098191931f38a;hpb=e8c1880a2b9a40eb11ee259feee3edd799139a43;p=dcpomatic.git diff --git a/src/lib/ffmpeg_examiner.cc b/src/lib/ffmpeg_examiner.cc index e439566a1..1d01981f6 100644 --- a/src/lib/ffmpeg_examiner.cc +++ b/src/lib/ffmpeg_examiner.cc @@ -1,5 +1,5 @@ /* - Copyright (C) 2013 Carl Hetherington + Copyright (C) 2013-2014 Carl Hetherington 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 @@ -23,13 +23,16 @@ extern "C" { } #include "ffmpeg_examiner.h" #include "ffmpeg_content.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; @@ -61,70 +64,106 @@ FFmpegExaminer::FFmpegExaminer (shared_ptr c) } } - /* Run through until we find the first audio (for each stream) and video */ - - 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 (_format_context->streams[_video_stream]); - } - } else { - for (size_t i = 0; i < _audio_streams.size(); ++i) { - if (_audio_streams[i]->uses_index (_format_context, _packet.stream_index) && !_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]->stream (_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) { + return; + } + + 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 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 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 +optional FFmpegExaminer::frame_time (AVStream* s) const { - optional t; + optional t; int64_t const bet = av_frame_get_best_effort_timestamp (_frame); if (bet != AV_NOPTS_VALUE) { - t = bet * av_q2d (s->time_base); + t = ContentTime::from_seconds (bet * av_q2d (s->time_base)); } return t; } -float +optional 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])); } dcp::Size @@ -133,18 +172,29 @@ FFmpegExaminer::video_size () const 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::Type (1), length.get ())); +} + +optional +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 (); + } + return float (sar.num) / sar.den; } string FFmpegExaminer::audio_stream_name (AVStream* s) const { - stringstream n; + SafeStringStream n; n << stream_name (s); @@ -160,7 +210,7 @@ FFmpegExaminer::audio_stream_name (AVStream* s) const string FFmpegExaminer::subtitle_stream_name (AVStream* s) const { - stringstream n; + SafeStringStream n; n << stream_name (s); @@ -174,7 +224,7 @@ FFmpegExaminer::subtitle_stream_name (AVStream* s) const 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);