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decoder/ffmpeg: support album art

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Closes https://github.com/MusicPlayerDaemon/MPD/issues/892
This commit is contained in:
Max Kellermann 2020-09-23 12:50:25 +02:00
parent 85bab67083
commit 065926d6a4
1 changed files with 50 additions and 0 deletions
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50
src/decoder/plugins/FfmpegDecoderPlugin.cxx
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@ -121,6 +121,49 @@ ffmpeg_find_audio_stream(const AVFormatContext &format_context) noexcept
return -1;
}
gcc_pure
static bool
IsPicture(const AVStream &stream) noexcept
{
return stream.codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
(stream.disposition & AV_DISPOSITION_ATTACHED_PIC) != 0 &&
stream.attached_pic.size > 0;
}
static const AVStream *
FindPictureStream(const AVFormatContext &format_context) noexcept
{
for (unsigned i = 0; i < format_context.nb_streams; ++i)
if (IsPicture(*format_context.streams[i]))
return format_context.streams[i];
return nullptr;
}
static const char *
GetMimeType(const AVCodecDescriptor &codec) noexcept
{
return codec.mime_types != nullptr
? *codec.mime_types
: nullptr;
}
static const char *
GetMimeType(const AVStream &stream) noexcept
{
const auto *codec = avcodec_descriptor_get(stream.codecpar->codec_id);
if (codec != nullptr)
return GetMimeType(*codec);
return nullptr;
}
static ConstBuffer<void>
ToConstBuffer(const AVPacket &packet) noexcept
{
return {packet.data, size_t(packet.size)};
}
/**
* Accessor for AVStream::start_time that replaces AV_NOPTS_VALUE with
* zero. We can't use AV_NOPTS_VALUE in calculations, and we simply
@ -625,6 +668,13 @@ FfmpegScanStream(AVFormatContext &format_context, TagHandler &handler)
FfmpegScanMetadata(format_context, audio_stream, handler);
if (handler.WantPicture()) {
const auto *picture_stream = FindPictureStream(format_context);
if (picture_stream != nullptr)
handler.OnPicture(GetMimeType(*picture_stream),
ToConstBuffer(picture_stream->attached_pic));
}
return true;
}