X-Git-Url: https://git.carlh.net/gitweb/?p=dcpomatic.git;a=blobdiff_plain;f=src%2Flib%2Fffmpeg_decoder.cc;h=82c7cafd1b8ec629b1473402ed089b06efad0f16;hp=eac1d91aea3c93db48178ed6fd7775e9b830c7af;hb=47f25009bcbc765e397bcb471dd361a511c99daf;hpb=afc495f722f89fea0bcc579046d1a5d362e36f69 diff --git a/src/lib/ffmpeg_decoder.cc b/src/lib/ffmpeg_decoder.cc index eac1d91ae..82c7cafd1 100644 --- a/src/lib/ffmpeg_decoder.cc +++ b/src/lib/ffmpeg_decoder.cc @@ -63,7 +63,7 @@ using libdcp::Size; boost::mutex FFmpegDecoder::_mutex; -FFmpegDecoder::FFmpegDecoder (shared_ptr f, shared_ptr c, bool video, bool audio, bool subtitles, bool video_sync) +FFmpegDecoder::FFmpegDecoder (shared_ptr f, shared_ptr c, bool video, bool audio, bool subtitles) : Decoder (f) , VideoDecoder (f) , AudioDecoder (f) @@ -80,16 +80,11 @@ FFmpegDecoder::FFmpegDecoder (shared_ptr f, shared_ptrlog()->log (String::compose (N_("error on av_read_frame (%1) (%2)"), buf, r)); } - + /* Get any remaining frames */ _packet.data = 0; _packet.size = 0; - + /* XXX: should we reset _packet.data and size after each *_decode_* call? */ - + int frame_finished; if (_decode_video) { while (avcodec_decode_video2 (_video_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) { - filter_and_emit_video (_frame); + filter_and_emit_video (); } } if (_ffmpeg_content->audio_stream() && _decode_audio) { decode_audio_packet (); } - + return true; } @@ -268,16 +263,12 @@ FFmpegDecoder::pass () _film->log()->log (String::compose (N_("Used only %1 bytes of %2 in packet"), r, _packet.size)); } - if (_video_sync) { - out_with_sync (); - } else { - filter_and_emit_video (_frame); - } + filter_and_emit_video (); } } else if (_ffmpeg_content->audio_stream() && _packet.stream_index == _ffmpeg_content->audio_stream()->id && _decode_audio) { decode_audio_packet (); - } else if (_ffmpeg_content->subtitle_stream() && _packet.stream_index == _ffmpeg_content->subtitle_stream()->id && _decode_subtitles && _first_video) { + } else if (_ffmpeg_content->subtitle_stream() && _packet.stream_index == _ffmpeg_content->subtitle_stream()->id && _decode_subtitles) { int got_subtitle; AVSubtitle sub; @@ -461,18 +452,20 @@ string FFmpegDecoder::stream_name (AVStream* s) const { stringstream n; - - AVDictionaryEntry const * lang = av_dict_get (s->metadata, N_("language"), 0, 0); - if (lang) { - n << lang->value; - } - - AVDictionaryEntry const * title = av_dict_get (s->metadata, N_("title"), 0, 0); - if (title) { - if (!n.str().empty()) { - n << N_(" "); + + if (s->metadata) { + AVDictionaryEntry const * lang = av_dict_get (s->metadata, N_("language"), 0, 0); + if (lang) { + n << lang->value; + } + + AVDictionaryEntry const * title = av_dict_get (s->metadata, N_("title"), 0, 0); + if (title) { + if (!n.str().empty()) { + n << N_(" "); + } + n << title->value; } - n << title->value; } if (n.str().empty()) { @@ -489,97 +482,92 @@ FFmpegDecoder::bytes_per_audio_sample () const } void -FFmpegDecoder::filter_and_emit_video (AVFrame* frame) +FFmpegDecoder::filter_and_emit_video () { boost::mutex::scoped_lock lm (_filter_graphs_mutex); shared_ptr graph; list >::iterator i = _filter_graphs.begin(); - while (i != _filter_graphs.end() && !(*i)->can_process (libdcp::Size (frame->width, frame->height), (AVPixelFormat) frame->format)) { + while (i != _filter_graphs.end() && !(*i)->can_process (libdcp::Size (_frame->width, _frame->height), (AVPixelFormat) _frame->format)) { ++i; } if (i == _filter_graphs.end ()) { - graph.reset (new FilterGraph (_film, this, libdcp::Size (frame->width, frame->height), (AVPixelFormat) frame->format)); + graph.reset (new FilterGraph (_film, this, libdcp::Size (_frame->width, _frame->height), (AVPixelFormat) _frame->format)); _filter_graphs.push_back (graph); - _film->log()->log (String::compose (N_("New graph for %1x%2, pixel format %3"), frame->width, frame->height, frame->format)); + _film->log()->log (String::compose (N_("New graph for %1x%2, pixel format %3"), _frame->width, _frame->height, _frame->format)); } else { graph = *i; } - list > images = graph->process (frame); + list > images = graph->process (_frame); for (list >::iterator i = images.begin(); i != images.end(); ++i) { - emit_video (*i, frame_time ()); + int64_t const bet = av_frame_get_best_effort_timestamp (_frame); + if (bet != AV_NOPTS_VALUE) { + emit_video (*i, false, bet * av_q2d (_format_context->streams[_video_stream]->time_base)); + } else { + _film->log()->log ("Dropping frame without PTS"); + } } } bool FFmpegDecoder::seek (double p) { - /* This use of AVSEEK_FLAG_BACKWARD is a bit of a hack; without it, if we ask for a seek to the same place as last time - (used when we change decoder parameters and want to re-fetch the frame) we end up going forwards rather than - staying in the same place. - */ - bool const backwards = (p == last_content_time()); - + return do_seek (p, false, false); +} + +void +FFmpegDecoder::seek_back () +{ + do_seek (last_content_time() - 2.5 / video_frame_rate(), true, true); +} + +void +FFmpegDecoder::seek_forward () +{ + do_seek (last_content_time() - 0.5 / video_frame_rate(), true, true); +} + +bool +FFmpegDecoder::do_seek (double p, bool backwards, bool accurate) +{ int64_t const vt = p / av_q2d (_format_context->streams[_video_stream]->time_base); int const r = av_seek_frame (_format_context, _video_stream, vt, backwards ? AVSEEK_FLAG_BACKWARD : 0); - + avcodec_flush_buffers (_video_codec_context); if (_subtitle_codec_context) { avcodec_flush_buffers (_subtitle_codec_context); } - - return r < 0; -} -void -FFmpegDecoder::out_with_sync () -{ - /* Where we are in the output, in seconds */ - double const out_pts_seconds = video_frame() / video_frame_rate(); - - /* Where we are in the source, in seconds */ - double const source_pts_seconds = av_q2d (_format_context->streams[_packet.stream_index]->time_base) - * av_frame_get_best_effort_timestamp(_frame); - - _film->log()->log ( - String::compose (N_("Source video frame ready; source at %1, output at %2"), source_pts_seconds, out_pts_seconds), - Log::VERBOSE - ); - - if (!_first_video) { - _first_video = source_pts_seconds; - } - - /* Difference between where we are and where we should be */ - double const delta = source_pts_seconds - _first_video.get() - out_pts_seconds; - double const one_frame = 1 / video_frame_rate(); - - /* Insert frames if required to get out_pts_seconds up to pts_seconds */ - if (delta > one_frame) { - int const extra = rint (delta / one_frame); - for (int i = 0; i < extra; ++i) { - repeat_last_video (frame_time ()); - _film->log()->log ( - String::compose ( - N_("Extra video frame inserted at %1s; source frame %2, source PTS %3 (at %4 fps)"), - out_pts_seconds, video_frame(), source_pts_seconds, video_frame_rate() - ) - ); + if (accurate) { + while (1) { + int r = av_read_frame (_format_context, &_packet); + if (r < 0) { + return true; + } + + avcodec_get_frame_defaults (_frame); + + if (_packet.stream_index == _video_stream) { + int finished = 0; + int const r = avcodec_decode_video2 (_video_codec_context, _frame, &finished, &_packet); + if (r >= 0 && finished) { + int64_t const bet = av_frame_get_best_effort_timestamp (_frame); + if (bet > vt) { + break; + } + } + } + + av_free_packet (&_packet); } } - - if (delta > -one_frame) { - /* Process this frame */ - filter_and_emit_video (_frame); - } else { - /* Otherwise we are omitting a frame to keep things right */ - _film->log()->log (String::compose (N_("Frame removed at %1s"), out_pts_seconds)); - } + + return r < 0; } void @@ -606,12 +594,6 @@ FFmpegDecoder::video_length () const return (double(_format_context->duration) / AV_TIME_BASE) * video_frame_rate(); } -double -FFmpegDecoder::frame_time () const -{ - return av_frame_get_best_effort_timestamp(_frame) * av_q2d (_format_context->streams[_video_stream]->time_base); -} - void FFmpegDecoder::decode_audio_packet () { @@ -625,53 +607,21 @@ FFmpegDecoder::decode_audio_packet () int frame_finished; int const decode_result = avcodec_decode_audio4 (_audio_codec_context, _frame, &frame_finished, ©_packet); - if (decode_result >= 0 && frame_finished) { - - /* Where we are in the source, in seconds */ - double const source_pts_seconds = av_q2d (_format_context->streams[copy_packet.stream_index]->time_base) - * av_frame_get_best_effort_timestamp(_frame); - - /* We only decode audio if we've had our first video packet through, and if it - was before this packet. Until then audio is thrown away. - */ + if (decode_result >= 0) { + if (frame_finished) { - if ((_first_video && _first_video.get() <= source_pts_seconds) || !_decode_video) { - - if (!_first_audio && _decode_video) { - _first_audio = source_pts_seconds; - - /* This is our first audio frame, and if we've arrived here we must have had our - first video frame. Push some silence to make up any gap between our first - video frame and our first audio. - */ - - /* frames of silence that we must push */ - int const s = rint ((_first_audio.get() - _first_video.get()) * _ffmpeg_content->audio_frame_rate ()); - - _film->log()->log ( - String::compose ( - N_("First video at %1, first audio at %2, pushing %3 audio frames of silence for %4 channels (%5 bytes per sample)"), - _first_video.get(), _first_audio.get(), s, _ffmpeg_content->audio_channels(), bytes_per_audio_sample() - ) - ); - - if (s) { - shared_ptr audio (new AudioBuffers (_ffmpeg_content->audio_channels(), s)); - audio->make_silent (); - Audio (audio); - } - } + /* Where we are in the source, in seconds */ + double const source_pts_seconds = av_q2d (_format_context->streams[copy_packet.stream_index]->time_base) + * av_frame_get_best_effort_timestamp(_frame); int const data_size = av_samples_get_buffer_size ( 0, _audio_codec_context->channels, _frame->nb_samples, audio_sample_format (), 1 ); assert (_audio_codec_context->channels == _ffmpeg_content->audio_channels()); - Audio (deinterleave_audio (_frame->data, data_size)); + Audio (deinterleave_audio (_frame->data, data_size), source_pts_seconds); } - } - - if (decode_result >= 0) { + copy_packet.data += decode_result; copy_packet.size -= decode_result; }