#include "ffmpeg_decoder.h"
#include "subtitle.h"
+using std::cout;
using std::string;
using std::vector;
using std::stringstream;
if (_subtitle_codec_context) {
avcodec_close (_subtitle_codec_context);
}
-
+
av_free (_frame);
+
avformat_close_input (&_format_context);
}
if (_video_codec == 0) {
throw DecodeError ("could not find video decoder");
}
+
+ /* I think this prevents problems with green hash on decodes and
+ "changing frame properties on the fly is not supported by all filters"
+ messages with some content. Although I'm not sure; needs checking.
+ */
+ AVDictionary* opts = 0;
+ av_dict_set (&opts, "threads", "1", 0);
- if (avcodec_open2 (_video_codec_context, _video_codec, 0) < 0) {
+ if (avcodec_open2 (_video_codec_context, _video_codec, &opts) < 0) {
throw DecodeError ("could not open video decoder");
}
}
if (r < 0) {
if (r != AVERROR_EOF) {
- throw DecodeError ("error on av_read_frame");
+ /* Maybe we should fail here, but for now we'll just finish off instead */
+ char buf[256];
+ av_strerror (r, buf, sizeof(buf));
+ _film->log()->log (String::compose ("error on av_read_frame (%1) (%2)", buf, r));
}
/* Get any remaining frames */
return true;
}
- double const pts_seconds = av_q2d (_format_context->streams[_packet.stream_index]->time_base) * _packet.pts;
+ avcodec_get_frame_defaults (_frame);
if (_packet.stream_index == _video_stream) {
- if (!_first_video) {
- _first_video = pts_seconds;
- }
-
int frame_finished;
- if (avcodec_decode_video2 (_video_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
- process_video (_frame);
- }
+ int const r = avcodec_decode_video2 (_video_codec_context, _frame, &frame_finished, &_packet);
+ if (r >= 0 && frame_finished) {
+
+ if (r != _packet.size) {
+ _film->log()->log (String::compose ("Used only %1 bytes of %2 in packet", r, _packet.size));
+ }
- } else if (_audio_stream >= 0 && _packet.stream_index == _audio_stream && _opt->decode_audio && _first_video && _first_video.get() <= pts_seconds) {
+ /* Where we are in the output, in seconds */
+ double const out_pts_seconds = video_frame_index() / frames_per_second();
- /* Note: 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 (!_first_audio) {
- _first_audio = pts_seconds;
-
- /* This is our first audio packet, and if we've arrived here we must have had our
- first video packet. Push some silence to make up the gap between our first
- video packet and our first audio.
- */
-
- /* frames of silence that we must push */
- int const s = rint ((_first_audio.get() - _first_video.get()) * audio_sample_rate ());
-
- _log->log (
- String::compose (
- "First video at %1, first audio at %2, pushing %3 frames of silence for %4 channels (%5 bytes per sample)",
- _first_video.get(), _first_audio.get(), s, audio_channels(), bytes_per_audio_sample()
- )
- );
-
- /* hence bytes */
- int const b = s * audio_channels() * bytes_per_audio_sample();
-
- /* XXX: this assumes that it won't be too much, and there are shaky assumptions
- that all sound representations are silent with memset()ed zero data.
- */
- uint8_t silence[b];
- memset (silence, 0, b);
- process_audio (silence, b);
+ /* 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);
+
+ 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 / frames_per_second();
+
+ /* 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 ();
+ _film->log()->log (
+ String::compose (
+ "Extra frame inserted at %1s; DCP frame %2, source PTS %3",
+ out_pts_seconds, video_frame_index(), source_pts_seconds
+ )
+ );
+ }
+ }
+
+ if (delta > -one_frame) {
+ /* Process this frame */
+ process_video (_frame);
+ } else {
+ /* Otherwise we are omitting a frame to keep things right */
+ _film->log()->log (String::compose ("Frame removed at %1s", out_pts_seconds));
+ }
}
-
- avcodec_get_frame_defaults (_frame);
-
+
+ } else if (_audio_stream >= 0 && _packet.stream_index == _audio_stream && _opt->decode_audio) {
+
int frame_finished;
if (avcodec_decode_audio4 (_audio_codec_context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
- int const data_size = av_samples_get_buffer_size (
- 0, _audio_codec_context->channels, _frame->nb_samples, audio_sample_format (), 1
- );
+
+ /* 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);
+
+ /* 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 (_first_video && _first_video.get() <= source_pts_seconds) {
+
+ if (!_first_audio) {
+ _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.
+ */
- assert (_audio_codec_context->channels == _film->audio_channels());
- process_audio (_frame->data[0], data_size);
+ /* frames of silence that we must push */
+ int const s = rint ((_first_audio.get() - _first_video.get()) * audio_sample_rate ());
+
+ _film->log()->log (
+ String::compose (
+ "First video at %1, first audio at %2, pushing %3 frames of silence for %4 channels (%5 bytes per sample)",
+ _first_video.get(), _first_audio.get(), s, audio_channels(), bytes_per_audio_sample()
+ )
+ );
+
+ if (s) {
+ /* hence bytes */
+ int const b = s * audio_channels() * bytes_per_audio_sample();
+
+ /* XXX: this assumes that it won't be too much, and there are shaky assumptions
+ that all sound representations are silent with memset()ed zero data.
+ */
+ uint8_t silence[b];
+ memset (silence, 0, b);
+ process_audio (silence, b);
+ }
+ }
+
+ 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 == _film->audio_channels());
+ process_audio (_frame->data[0], data_size);
+ }
}
} else if (_subtitle_stream >= 0 && _packet.stream_index == _subtitle_stream && _opt->decode_subtitles && _first_video) {
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