-/* -*- c-basic-offset: 8; default-tab-width: 8; -*- */
-
/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
#include <iostream>
#include <stdint.h>
#include <boost/lexical_cast.hpp>
+#include <sndfile.h>
extern "C" {
-#include <tiffio.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
-#include <libswscale/swscale.h>
-#include <libpostproc/postprocess.h>
}
-#include <sndfile.h>
#include "film.h"
#include "filter.h"
#include "exceptions.h"
#include "log.h"
#include "ffmpeg_decoder.h"
#include "filter_graph.h"
-#include "subtitle.h"
#include "audio_buffers.h"
+#include "ffmpeg_content.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;
using libdcp::Size;
-boost::mutex FFmpegDecoder::_mutex;
-
-FFmpegDecoder::FFmpegDecoder (shared_ptr<const Film> f, shared_ptr<const FFmpegContent> c, bool video, bool audio, bool subtitles)
+FFmpegDecoder::FFmpegDecoder (shared_ptr<const Film> f, shared_ptr<const FFmpegContent> c, bool video, bool audio)
: Decoder (f)
, VideoDecoder (f, c)
, AudioDecoder (f, c)
- , _ffmpeg_content (c)
- , _format_context (0)
- , _video_stream (-1)
- , _frame (0)
- , _video_codec_context (0)
- , _video_codec (0)
- , _audio_codec_context (0)
- , _audio_codec (0)
+ , SubtitleDecoder (f)
+ , FFmpeg (c)
, _subtitle_codec_context (0)
, _subtitle_codec (0)
, _decode_video (video)
, _decode_audio (audio)
- , _decode_subtitles (subtitles)
+ , _video_pts_offset (0)
+ , _audio_pts_offset (0)
{
- setup_general ();
- setup_video ();
- setup_audio ();
setup_subtitle ();
-}
-FFmpegDecoder::~FFmpegDecoder ()
-{
- boost::mutex::scoped_lock lm (_mutex);
-
- if (_audio_codec_context) {
- avcodec_close (_audio_codec_context);
- }
+ /* Audio and video frame PTS values may not start with 0. We want
+ to fiddle them so that:
- if (_video_codec_context) {
- avcodec_close (_video_codec_context);
- }
+ 1. One of them starts at time 0.
+ 2. The first video PTS value ends up on a frame boundary.
- if (_subtitle_codec_context) {
- avcodec_close (_subtitle_codec_context);
- }
+ Then we remove big initial gaps in PTS and we allow our
+ insertion of black frames to work.
- av_free (_frame);
-
- avformat_close_input (&_format_context);
-}
+ 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;
+ */
-void
-FFmpegDecoder::setup_general ()
-{
- av_register_all ();
+ bool const have_video = video && c->first_video();
+ bool const have_audio = audio && c->audio_stream() && c->audio_stream()->first_audio;
- if (avformat_open_input (&_format_context, _ffmpeg_content->file().string().c_str(), 0, 0) < 0) {
- throw OpenFileError (_ffmpeg_content->file().string ());
- }
+ /* First, make one of them start at 0 */
- if (avformat_find_stream_info (_format_context, 0) < 0) {
- throw DecodeError (_("could not find stream information"));
+ 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();
+ } else if (have_audio) {
+ _audio_pts_offset = - c->audio_stream()->first_audio.get();
}
- /* Find video, audio and subtitle streams */
-
- for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
- AVStream* s = _format_context->streams[i];
- if (s->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
- _video_stream = i;
- } else if (s->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
-
- /* This is a hack; sometimes it seems that _audio_codec_context->channel_layout isn't set up,
- so bodge it here. No idea why we should have to do this.
- */
-
- if (s->codec->channel_layout == 0) {
- s->codec->channel_layout = av_get_default_channel_layout (s->codec->channels);
- }
-
- _audio_streams.push_back (
- shared_ptr<FFmpegAudioStream> (
- new FFmpegAudioStream (stream_name (s), i, s->codec->sample_rate, s->codec->channels)
- )
- );
-
- } else if (s->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
- _subtitle_streams.push_back (shared_ptr<FFmpegSubtitleStream> (new FFmpegSubtitleStream (stream_name (s), i)));
+ /* 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 ();
}
- }
-
- if (_video_stream < 0) {
- throw DecodeError (N_("could not find video stream"));
- }
- _frame = avcodec_alloc_frame ();
- if (_frame == 0) {
- throw DecodeError (N_("could not allocate frame"));
+ _video_pts_offset += first_video - old_first_video;
+ _audio_pts_offset += first_video - old_first_video;
}
}
-void
-FFmpegDecoder::setup_video ()
+FFmpegDecoder::~FFmpegDecoder ()
{
boost::mutex::scoped_lock lm (_mutex);
-
- _video_codec_context = _format_context->streams[_video_stream]->codec;
- _video_codec = avcodec_find_decoder (_video_codec_context->codec_id);
- if (_video_codec == 0) {
- throw DecodeError (_("could not find video decoder"));
- }
-
- if (avcodec_open2 (_video_codec_context, _video_codec, 0) < 0) {
- throw DecodeError (N_("could not open video decoder"));
+ if (_subtitle_codec_context) {
+ avcodec_close (_subtitle_codec_context);
}
}
void
-FFmpegDecoder::setup_audio ()
+FFmpegDecoder::flush ()
{
- boost::mutex::scoped_lock lm (_mutex);
+ /* Get any remaining frames */
- if (!_ffmpeg_content->audio_stream ()) {
- return;
- }
-
- _audio_codec_context = _format_context->streams[_ffmpeg_content->audio_stream()->id]->codec;
- _audio_codec = avcodec_find_decoder (_audio_codec_context->codec_id);
-
- if (_audio_codec == 0) {
- throw DecodeError (_("could not find audio decoder"));
- }
-
- if (avcodec_open2 (_audio_codec_context, _audio_codec, 0) < 0) {
- throw DecodeError (N_("could not open audio decoder"));
- }
-}
-
-void
-FFmpegDecoder::setup_subtitle ()
-{
- boost::mutex::scoped_lock lm (_mutex);
+ _packet.data = 0;
+ _packet.size = 0;
- if (!_ffmpeg_content->subtitle_stream() || _ffmpeg_content->subtitle_stream()->id >= int (_format_context->nb_streams)) {
- return;
- }
-
- _subtitle_codec_context = _format_context->streams[_ffmpeg_content->subtitle_stream()->id]->codec;
- _subtitle_codec = avcodec_find_decoder (_subtitle_codec_context->codec_id);
-
- if (_subtitle_codec == 0) {
- throw DecodeError (_("could not find subtitle decoder"));
+ /* XXX: should we reset _packet.data and size after each *_decode_* call? */
+
+ if (_decode_video) {
+ while (decode_video_packet ()) {}
}
- if (avcodec_open2 (_subtitle_codec_context, _subtitle_codec, 0) < 0) {
- throw DecodeError (N_("could not open subtitle decoder"));
+ if (_ffmpeg_content->audio_stream() && _decode_audio) {
+ decode_audio_packet ();
}
-}
+ /* Stop us being asked for any more data */
+ _video_position = _ffmpeg_content->video_length ();
+ _audio_position = _ffmpeg_content->audio_length ();
+}
void
FFmpegDecoder::pass ()
film->log()->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? */
-
- if (_decode_video) {
- while (decode_video_packet ());
- }
-
- if (_ffmpeg_content->audio_stream() && _decode_audio) {
- decode_audio_packet ();
- }
-
+ flush ();
return;
}
avcodec_get_frame_defaults (_frame);
- if (_packet.stream_index == _video_stream && _decode_video) {
+ shared_ptr<const Film> film = _film.lock ();
+ assert (film);
+
+ int const si = _packet.stream_index;
+
+ if (si == _video_stream && _decode_video) {
decode_video_packet ();
- } else if (_ffmpeg_content->audio_stream() && _packet.stream_index == _ffmpeg_content->audio_stream()->id && _decode_audio) {
+ } else if (_ffmpeg_content->audio_stream() && si == _ffmpeg_content->audio_stream()->index (_format_context) && _decode_audio) {
decode_audio_packet ();
- } else if (_ffmpeg_content->subtitle_stream() && _packet.stream_index == _ffmpeg_content->subtitle_stream()->id && _decode_subtitles) {
-
- 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);
- }
+ } else if (_ffmpeg_content->subtitle_stream() && si == _ffmpeg_content->subtitle_stream()->index (_format_context) && film->with_subtitles ()) {
+ decode_subtitle_packet ();
}
av_free_packet (&_packet);
return audio;
}
-float
-FFmpegDecoder::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);
-}
-
AVSampleFormat
FFmpegDecoder::audio_sample_format () const
{
- if (_audio_codec_context == 0) {
+ if (!_ffmpeg_content->audio_stream()) {
return (AVSampleFormat) 0;
}
- return _audio_codec_context->sample_fmt;
+ return audio_codec_context()->sample_fmt;
}
-libdcp::Size
-FFmpegDecoder::video_size () const
+int
+FFmpegDecoder::bytes_per_audio_sample () const
{
- return libdcp::Size (_video_codec_context->width, _video_codec_context->height);
+ return av_get_bytes_per_sample (audio_sample_format ());
}
-string
-FFmpegDecoder::stream_name (AVStream* s) const
+int
+FFmpegDecoder::minimal_run (boost::function<bool (int)> finished)
{
- stringstream n;
-
- if (s->metadata) {
- AVDictionaryEntry const * lang = av_dict_get (s->metadata, N_("language"), 0, 0);
- if (lang) {
- n << lang->value;
+ int frames_read = 0;
+
+ while (!finished (frames_read)) {
+ int r = av_read_frame (_format_context, &_packet);
+ if (r < 0) {
+ return -1;
}
-
- AVDictionaryEntry const * title = av_dict_get (s->metadata, N_("title"), 0, 0);
- if (title) {
- if (!n.str().empty()) {
- n << N_(" ");
+
+ ++frames_read;
+
+ double const time_base = av_q2d (_format_context->streams[_packet.stream_index]->time_base);
+
+ if (_packet.stream_index == _video_stream) {
+
+ 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()
+ );
+ }
+
+ } else if (_ffmpeg_content->audio_stream() && _packet.stream_index == _ffmpeg_content->audio_stream()->index (_format_context)) {
+
+ AVPacket copy_packet = _packet;
+
+ while (copy_packet.size > 0) {
+
+ int finished;
+ r = avcodec_decode_audio4 (audio_codec_context(), _frame, &finished, ©_packet);
+ if (r >= 0 && finished) {
+ _audio_position = rint (
+ (av_frame_get_best_effort_timestamp (_frame) * time_base + _audio_pts_offset) *
+ _ffmpeg_content->audio_stream()->frame_rate
+ );
+ }
+
+ copy_packet.data += r;
+ copy_packet.size -= r;
}
- n << title->value;
}
- }
- if (n.str().empty()) {
- n << N_("unknown");
+ av_free_packet (&_packet);
}
- return n.str ();
+ return frames_read;
}
-int
-FFmpegDecoder::bytes_per_audio_sample () const
+bool
+FFmpegDecoder::seek_overrun_finished (DCPTime seek) const
{
- return av_get_bytes_per_sample (audio_sample_format ());
+ return (
+ _video_position >= _ffmpeg_content->time_to_content_video_frames (seek) ||
+ _audio_position >= _ffmpeg_content->time_to_content_audio_frames (seek, _ffmpeg_content->position())
+ );
}
-void
-FFmpegDecoder::seek (Time t)
+bool
+FFmpegDecoder::seek_final_finished (int n, int done) const
{
- do_seek (t, false, false);
+ return n == done;
}
void
-FFmpegDecoder::seek_back ()
+FFmpegDecoder::seek_and_flush (DCPTime t)
{
- if (next() < (2.5 * TIME_HZ / video_frame_rate())) {
- return;
+ int64_t const initial_v = ((_ffmpeg_content->time_to_content_video_frames (t) / _ffmpeg_content->video_frame_rate()) - _video_pts_offset) /
+ av_q2d (_format_context->streams[_video_stream]->time_base);
+
+ av_seek_frame (_format_context, _video_stream, initial_v, AVSEEK_FLAG_BACKWARD);
+
+ shared_ptr<FFmpegAudioStream> as = _ffmpeg_content->audio_stream ();
+ if (as) {
+ int64_t initial_a = ((_ffmpeg_content->time_to_content_audio_frames (t, t) / as->frame_rate) - _audio_pts_offset) /
+ av_q2d (as->stream(_format_context)->time_base);
+
+ av_seek_frame (_format_context, as->index (_format_context), initial_a, AVSEEK_FLAG_BACKWARD);
}
-
- do_seek (next() - 2.5 * TIME_HZ / video_frame_rate(), true, true);
-}
-void
-FFmpegDecoder::seek_forward ()
-{
- if (next() >= (_ffmpeg_content->length() - 0.5 * TIME_HZ / video_frame_rate())) {
- return;
+ avcodec_flush_buffers (video_codec_context());
+ if (audio_codec_context ()) {
+ avcodec_flush_buffers (audio_codec_context ());
}
-
- do_seek (next() - 0.5 * TIME_HZ / video_frame_rate(), true, true);
+ if (_subtitle_codec_context) {
+ avcodec_flush_buffers (_subtitle_codec_context);
+ }
+
+ _video_position = _ffmpeg_content->time_to_content_video_frames (t);
+ _audio_position = _ffmpeg_content->time_to_content_audio_frames (t, t);
}
void
-FFmpegDecoder::do_seek (Time t, bool backwards, bool accurate)
+FFmpegDecoder::seek (DCPTime time, 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);
+ /* If we are doing an accurate seek, our initial shot will be 200ms (200 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.
+ */
- avcodec_flush_buffers (_video_codec_context);
- if (_subtitle_codec_context) {
- avcodec_flush_buffers (_subtitle_codec_context);
+ DCPTime pre_roll = accurate ? (0.2 * TIME_HZ) : 0;
+ DCPTime initial_seek = time - pre_roll;
+ if (initial_seek < 0) {
+ initial_seek = 0;
}
+
+ /* Initial seek time in the video stream's timebase */
- 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;
- }
- }
- }
-
- av_free_packet (&_packet);
- }
+ seek_and_flush (initial_seek);
+
+ if (time == 0 || !accurate) {
+ /* We're already there, or we're as close as we need to be */
+ return;
}
- return;
-}
+ int const N = minimal_run (boost::bind (&FFmpegDecoder::seek_overrun_finished, this, time));
-/** @return Length (in video frames) according to our content's header */
-ContentVideoFrame
-FFmpegDecoder::video_length () const
-{
- return (double(_format_context->duration) / AV_TIME_BASE) * video_frame_rate();
+ seek_and_flush (initial_seek);
+ if (N > 0) {
+ minimal_run (boost::bind (&FFmpegDecoder::seek_final_finished, this, N - 1, _1));
+ }
}
void
*/
AVPacket copy_packet = _packet;
-
+
while (copy_packet.size > 0) {
int frame_finished;
- int const decode_result = avcodec_decode_audio4 (_audio_codec_context, _frame, &frame_finished, ©_packet);
- if (decode_result >= 0) {
- if (frame_finished) {
+ int const decode_result = avcodec_decode_audio4 (audio_codec_context(), _frame, &frame_finished, ©_packet);
+
+ if (decode_result < 0) {
+ shared_ptr<const Film> film = _film.lock ();
+ assert (film);
+ film->log()->log (String::compose ("avcodec_decode_audio4 failed (%1)", decode_result));
+ return;
+ }
+
+ if (frame_finished) {
+ Time const t = (av_q2d (_format_context->streams[copy_packet.stream_index]->time_base)
+ * av_frame_get_best_effort_timestamp(_frame) + _audio_pts_offset) * TIME_HZ;
- /* 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), source_pts_seconds);
- }
+ int const data_size = av_samples_get_buffer_size (
+ 0, audio_codec_context()->channels, _frame->nb_samples, audio_sample_format (), 1
+ );
- copy_packet.data += decode_result;
- copy_packet.size -= decode_result;
+ audio (deinterleave_audio (_frame->data, data_size), t);
}
+
+ copy_packet.data += decode_result;
+ copy_packet.size -= decode_result;
}
}
FFmpegDecoder::decode_video_packet ()
{
int frame_finished;
- if (avcodec_decode_video2 (_video_codec_context, _frame, &frame_finished, &_packet) < 0 || !frame_finished) {
+ 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;
+ if (i->second != AV_NOPTS_VALUE) {
+ Time const t = (i->second * av_q2d (_format_context->streams[_video_stream]->time_base) + _video_pts_offset) * TIME_HZ;
video (image, false, t);
} else {
shared_ptr<const Film> film = _film.lock ();
return true;
}
-Time
-FFmpegDecoder::next () const
+
+void
+FFmpegDecoder::setup_subtitle ()
{
- if (_decode_video && _decode_audio && _audio_codec_context) {
- return min (_next_video, _next_audio);
+ boost::mutex::scoped_lock lm (_mutex);
+
+ if (!_ffmpeg_content->subtitle_stream() || _ffmpeg_content->subtitle_stream()->index (_format_context) >= int (_format_context->nb_streams)) {
+ return;
}
- if (_decode_audio && _audio_codec_context) {
- return _next_audio;
- }
+ _subtitle_codec_context = _ffmpeg_content->subtitle_stream()->stream(_format_context)->codec;
+ _subtitle_codec = avcodec_find_decoder (_subtitle_codec_context->codec_id);
- return _next_video;
+ if (_subtitle_codec == 0) {
+ throw DecodeError (_("could not find subtitle decoder"));
+ }
+
+ if (avcodec_open2 (_subtitle_codec_context, _subtitle_codec, 0) < 0) {
+ throw DecodeError (N_("could not open subtitle decoder"));
+ }
}
bool
FFmpegDecoder::done () const
{
- return (!_decode_audio || !_audio_codec_context || audio_done()) && (!_decode_video || video_done());
+ 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 */
+ DCPTime const from = (packet_time + (double (sub.start_display_time) / 1e3)) * TIME_HZ;
+ DCPTime 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);
+}