#include "log.h"
#include "ffmpeg_decoder.h"
#include "filter_graph.h"
-#include "subtitle.h"
#include "audio_buffers.h"
#include "i18n.h"
using std::stringstream;
using std::list;
using std::min;
+using std::pair;
using boost::shared_ptr;
using boost::optional;
using boost::dynamic_pointer_cast;
: Decoder (f)
, VideoDecoder (f, c)
, AudioDecoder (f, c)
+ , SubtitleDecoder (f)
, FFmpeg (c)
, _subtitle_codec_context (0)
, _subtitle_codec (0)
, _decode_video (video)
, _decode_audio (audio)
+ , _video_pts_offset (0)
+ , _audio_pts_offset (0)
+ , _just_sought (false)
{
setup_subtitle ();
+
+ /* Audio and video frame PTS values may not start with 0. We want
+ to fiddle them so that:
+
+ 1. One of them starts at time 0.
+ 2. The first video PTS value ends up on a frame boundary.
+
+ Then we remove big initial gaps in PTS and we allow our
+ insertion of black frames to work.
+
+ We will do:
+ audio_pts_to_use = audio_pts_from_ffmpeg + audio_pts_offset;
+ video_pts_to_use = video_pts_from_ffmpeg + video_pts_offset;
+ */
+
+ bool const have_video = video && c->first_video();
+ bool const have_audio = audio && c->audio_stream() && c->audio_stream()->first_audio;
+
+ /* First, make one of them start at 0 */
+
+ if (have_audio && have_video) {
+ _video_pts_offset = _audio_pts_offset = - min (c->first_video().get(), c->audio_stream()->first_audio.get());
+ } else if (have_video) {
+ _video_pts_offset = - c->first_video().get();
+ }
+
+ /* Now adjust both so that the video pts starts on a frame */
+ if (have_video && have_audio) {
+ double first_video = c->first_video().get() + _video_pts_offset;
+ double const old_first_video = first_video;
+
+ /* Round the first video up to a frame boundary */
+ if (fabs (rint (first_video * c->video_frame_rate()) - first_video * c->video_frame_rate()) > 1e-6) {
+ first_video = ceil (first_video * c->video_frame_rate()) / c->video_frame_rate ();
+ }
+
+ _video_pts_offset += first_video - old_first_video;
+ _audio_pts_offset += first_video - old_first_video;
+ }
}
FFmpegDecoder::~FFmpegDecoder ()
{
+ boost::mutex::scoped_lock lm (_mutex);
+
if (_subtitle_codec_context) {
avcodec_close (_subtitle_codec_context);
}
/* XXX: should we reset _packet.data and size after each *_decode_* call? */
if (_decode_video) {
- while (decode_video_packet ());
+ while (decode_video_packet ()) {}
}
if (_ffmpeg_content->audio_stream() && _decode_audio) {
}
/* Stop us being asked for any more data */
- _next_video = _next_audio = _ffmpeg_content->length ();
+ _video_position = _ffmpeg_content->video_length ();
+ _audio_position = _ffmpeg_content->audio_length ();
return;
}
} 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) {
-
- int got_subtitle;
- AVSubtitle sub;
- if (avcodec_decode_subtitle2 (_subtitle_codec_context, &sub, &got_subtitle, &_packet) && got_subtitle) {
- /* Sometimes we get an empty AVSubtitle, which is used by some codecs to
- indicate that the previous subtitle should stop.
- */
- if (sub.num_rects > 0) {
- shared_ptr<TimedSubtitle> ts;
- try {
- subtitle (shared_ptr<TimedSubtitle> (new TimedSubtitle (sub)));
- } catch (...) {
- /* some problem with the subtitle; we probably didn't understand it */
- }
- } else {
- subtitle (shared_ptr<TimedSubtitle> ());
- }
- avsubtitle_free (&sub);
- }
+ decode_subtitle_packet ();
}
av_free_packet (&_packet);
}
void
-FFmpegDecoder::seek (Time t)
+FFmpegDecoder::seek (VideoContent::Frame frame, bool accurate)
{
- do_seek (t, false, false);
- VideoDecoder::seek (t);
-}
+ double const time_base = av_q2d (_format_context->streams[_video_stream]->time_base);
-void
-FFmpegDecoder::seek_back ()
-{
- if (position() < (2.5 * TIME_HZ / _ffmpeg_content->video_frame_rate())) {
- return;
+ /* If we are doing an accurate seek, our initial shot will be 5 frames (5 being
+ a number plucked from the air) earlier than we want to end up. The loop below
+ will hopefully then step through to where we want to be.
+ */
+ int initial = frame;
+
+ if (accurate) {
+ initial -= 5;
}
-
- do_seek (position() - 2.5 * TIME_HZ / _ffmpeg_content->video_frame_rate(), true, true);
- VideoDecoder::seek_back ();
-}
-void
-FFmpegDecoder::seek_forward ()
-{
- if (position() >= (_ffmpeg_content->length() - 0.5 * TIME_HZ / _ffmpeg_content->video_frame_rate())) {
- return;
+ if (initial < 0) {
+ initial = 0;
}
-
- do_seek (position() - 0.5 * TIME_HZ / _ffmpeg_content->video_frame_rate(), true, true);
- VideoDecoder::seek_forward ();
-}
-void
-FFmpegDecoder::do_seek (Time t, bool backwards, bool accurate)
-{
- int64_t const vt = t / (av_q2d (_format_context->streams[_video_stream]->time_base) * TIME_HZ);
- av_seek_frame (_format_context, _video_stream, vt, backwards ? AVSEEK_FLAG_BACKWARD : 0);
+ /* Initial seek time in the stream's timebase */
+ int64_t const initial_vt = ((initial / _ffmpeg_content->video_frame_rate()) - _video_pts_offset) / time_base;
+
+ av_seek_frame (_format_context, _video_stream, initial_vt, AVSEEK_FLAG_BACKWARD);
avcodec_flush_buffers (video_codec_context());
if (_subtitle_codec_context) {
avcodec_flush_buffers (_subtitle_codec_context);
}
- if (accurate) {
- while (1) {
- int r = av_read_frame (_format_context, &_packet);
- if (r < 0) {
- return;
- }
-
- 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;
- }
- }
+ _just_sought = true;
+ _video_position = frame;
+
+ if (frame == 0 || !accurate) {
+ /* We're already there, or we're as close as we need to be */
+ return;
+ }
+
+ while (1) {
+ int r = av_read_frame (_format_context, &_packet);
+ if (r < 0) {
+ return;
+ }
+
+ if (_packet.stream_index != _video_stream) {
+ continue;
+ }
+
+ avcodec_get_frame_defaults (_frame);
+
+ int finished = 0;
+ r = avcodec_decode_video2 (video_codec_context(), _frame, &finished, &_packet);
+ if (r >= 0 && finished) {
+ _video_position = rint (
+ (av_frame_get_best_effort_timestamp (_frame) * time_base + _video_pts_offset) * _ffmpeg_content->video_frame_rate()
+ );
+
+ if (_video_position >= (frame - 1)) {
+ av_free_packet (&_packet);
+ break;
}
-
- av_free_packet (&_packet);
}
+
+ av_free_packet (&_packet);
}
-
- return;
}
void
int const decode_result = avcodec_decode_audio4 (audio_codec_context(), _frame, &frame_finished, ©_packet);
if (decode_result >= 0) {
if (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);
-
+
+ if (_audio_position == 0) {
+ /* Where we are in the source, in seconds */
+ double const pts = av_q2d (_format_context->streams[copy_packet.stream_index]->time_base)
+ * av_frame_get_best_effort_timestamp(_frame) + _audio_pts_offset;
+
+ if (pts > 0) {
+ /* Emit some silence */
+ shared_ptr<AudioBuffers> silence (
+ new AudioBuffers (
+ _ffmpeg_content->audio_channels(),
+ pts * _ffmpeg_content->content_audio_frame_rate()
+ )
+ );
+
+ silence->make_silent ();
+ audio (silence, _audio_position);
+ }
+ }
+
int const data_size = av_samples_get_buffer_size (
0, audio_codec_context()->channels, _frame->nb_samples, audio_sample_format (), 1
);
+
+ audio (deinterleave_audio (_frame->data, data_size), _audio_position);
- assert (audio_codec_context()->channels == _ffmpeg_content->audio_channels());
- audio (deinterleave_audio (_frame->data, data_size), source_pts_seconds * TIME_HZ);
+ copy_packet.data += decode_result;
+ copy_packet.size -= decode_result;
}
-
- copy_packet.data += decode_result;
- copy_packet.size -= decode_result;
}
}
}
if (avcodec_decode_video2 (video_codec_context(), _frame, &frame_finished, &_packet) < 0 || !frame_finished) {
return false;
}
-
+
boost::mutex::scoped_lock lm (_filter_graphs_mutex);
shared_ptr<FilterGraph> graph;
graph = *i;
}
- list<shared_ptr<Image> > images = graph->process (_frame);
+ list<pair<shared_ptr<Image>, int64_t> > images = graph->process (_frame);
string post_process = Filter::ffmpeg_strings (_ffmpeg_content->filters()).second;
- for (list<shared_ptr<Image> >::iterator i = images.begin(); i != images.end(); ++i) {
+ for (list<pair<shared_ptr<Image>, int64_t> >::iterator i = images.begin(); i != images.end(); ++i) {
- shared_ptr<Image> image = *i;
+ shared_ptr<Image> image = i->first;
if (!post_process.empty ()) {
image = image->post_process (post_process, true);
}
- int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
- if (bet != AV_NOPTS_VALUE) {
- /* XXX: may need to insert extra frames / remove frames here ...
- (as per old Matcher)
- */
- Time const t = bet * av_q2d (_format_context->streams[_video_stream]->time_base) * TIME_HZ;
- video (image, false, t);
+ if (i->second != AV_NOPTS_VALUE) {
+
+ double const pts = i->second * av_q2d (_format_context->streams[_video_stream]->time_base) + _video_pts_offset;
+
+ if (_just_sought) {
+ /* We just did a seek, so disable any attempts to correct for where we
+ are / should be.
+ */
+ _video_position = rint (pts * _ffmpeg_content->video_frame_rate ());
+ _just_sought = false;
+ }
+
+ double const next = _video_position / _ffmpeg_content->video_frame_rate();
+ double const one_frame = 1 / _ffmpeg_content->video_frame_rate ();
+ double delta = pts - next;
+
+ while (delta > one_frame) {
+ /* This PTS is more than one frame forward in time of where we think we should be; emit
+ a black frame.
+ */
+
+ /* XXX: I think this should be a copy of the last frame... */
+ boost::shared_ptr<Image> black (
+ new Image (
+ static_cast<AVPixelFormat> (_frame->format),
+ libdcp::Size (video_codec_context()->width, video_codec_context()->height),
+ true
+ )
+ );
+
+ black->make_black ();
+ video (image, false, _video_position);
+ delta -= one_frame;
+ }
+
+ if (delta > -one_frame) {
+ /* This PTS is within a frame of being right; emit this (otherwise it will be dropped) */
+ video (image, false, _video_position);
+ }
+
} else {
shared_ptr<const Film> film = _film.lock ();
assert (film);
return true;
}
-Time
-FFmpegDecoder::position () const
-{
- if (_decode_video && _decode_audio && _ffmpeg_content->audio_stream()) {
- return min (_next_video, _next_audio);
- }
-
- if (_decode_audio && _ffmpeg_content->audio_stream()) {
- return _next_audio;
- }
-
- return _next_video;
-}
-
-bool
-FFmpegDecoder::done () const
-{
- bool const ad = !_decode_audio || !_ffmpeg_content->audio_stream() || audio_done();
- bool const vd = !_decode_video || video_done();
- return ad && vd;
-}
void
FFmpegDecoder::setup_subtitle ()
throw DecodeError (N_("could not open subtitle decoder"));
}
}
+
+bool
+FFmpegDecoder::done () const
+{
+ bool const vd = !_decode_video || (_video_position >= _ffmpeg_content->video_length());
+ bool const ad = !_decode_audio || !_ffmpeg_content->audio_stream() || (_audio_position >= _ffmpeg_content->audio_length());
+ return vd && ad;
+}
+
+void
+FFmpegDecoder::decode_subtitle_packet ()
+{
+ int got_subtitle;
+ AVSubtitle sub;
+ if (avcodec_decode_subtitle2 (_subtitle_codec_context, &sub, &got_subtitle, &_packet) < 0 || !got_subtitle) {
+ return;
+ }
+
+ /* Sometimes we get an empty AVSubtitle, which is used by some codecs to
+ indicate that the previous subtitle should stop.
+ */
+ if (sub.num_rects <= 0) {
+ subtitle (shared_ptr<Image> (), dcpomatic::Rect<double> (), 0, 0);
+ return;
+ } else if (sub.num_rects > 1) {
+ throw DecodeError (_("multi-part subtitles not yet supported"));
+ }
+
+ /* Subtitle PTS in seconds (within the source, not taking into account any of the
+ source that we may have chopped off for the DCP)
+ */
+ double const packet_time = static_cast<double> (sub.pts) / AV_TIME_BASE;
+
+ /* hence start time for this sub */
+ Time const from = (packet_time + (double (sub.start_display_time) / 1e3)) * TIME_HZ;
+ Time const to = (packet_time + (double (sub.end_display_time) / 1e3)) * TIME_HZ;
+
+ AVSubtitleRect const * rect = sub.rects[0];
+
+ if (rect->type != SUBTITLE_BITMAP) {
+ throw DecodeError (_("non-bitmap subtitles not yet supported"));
+ }
+
+ shared_ptr<Image> image (new Image (PIX_FMT_RGBA, libdcp::Size (rect->w, rect->h), true));
+
+ /* Start of the first line in the subtitle */
+ uint8_t* sub_p = rect->pict.data[0];
+ /* sub_p looks up into a RGB palette which is here */
+ uint32_t const * palette = (uint32_t *) rect->pict.data[1];
+ /* Start of the output data */
+ uint32_t* out_p = (uint32_t *) image->data()[0];
+
+ for (int y = 0; y < rect->h; ++y) {
+ uint8_t* sub_line_p = sub_p;
+ uint32_t* out_line_p = out_p;
+ for (int x = 0; x < rect->w; ++x) {
+ *out_line_p++ = palette[*sub_line_p++];
+ }
+ sub_p += rect->pict.linesize[0];
+ out_p += image->stride()[0] / sizeof (uint32_t);
+ }
+
+ libdcp::Size const vs = _ffmpeg_content->video_size ();
+
+ subtitle (
+ image,
+ dcpomatic::Rect<double> (
+ static_cast<double> (rect->x) / vs.width,
+ static_cast<double> (rect->y) / vs.height,
+ static_cast<double> (rect->w) / vs.width,
+ static_cast<double> (rect->h) / vs.height
+ ),
+ from,
+ to
+ );
+
+
+ avsubtitle_free (&sub);
+}
projects / dcpomatic.git / blobdiff