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/**********************************************************************
Audacity: A Digital Audio Editor
AVStreamWrapperImpl.inl
Dmitry Vedenko
**********************************************************************/
class AVStreamWrapperImpl : public AVStreamWrapper
{
public:
AVStreamWrapperImpl(
const FFmpegFunctions& ffmpeg, AVStream* wrapped, bool forEncoding)
: AVStreamWrapper(ffmpeg, wrapped)
, mForEncoding(forEncoding)
{
}
int GetIndex() const noexcept override
{
if (mAVStream != nullptr)
return mAVStream->index;
return {};
}
int GetId() const noexcept override
{
if (mAVStream != nullptr)
return mAVStream->id;
return {};
}
void SetId(int id) noexcept override
{
if (mAVStream != nullptr)
mAVStream->id = id;
}
AudacityAVRational GetTimeBase() const noexcept override
{
if (mAVStream != nullptr)
return { mAVStream->time_base.num, mAVStream->time_base.den };
return {};
}
void SetTimeBase(AudacityAVRational time_base) noexcept override
{
if (mAVStream == nullptr)
return;
mAVStream->time_base.num = time_base.num;
mAVStream->time_base.den = time_base.den;
}
int64_t GetStartTime() const noexcept override
{
if (mAVStream != nullptr)
return mAVStream->start_time;
return {};
}
void SetStartTime(int64_t start_time) noexcept override
{
if (mAVStream != nullptr)
mAVStream->start_time = start_time;
}
int64_t GetDuration() const noexcept override
{
if (mAVStream != nullptr)
return mAVStream->duration;
return {};
}
void SetDuration(int64_t duration) noexcept override
{
if (mAVStream != nullptr)
mAVStream->duration = duration;
}
int64_t GetFramesCount() const noexcept override
{
if (mAVStream != nullptr)
return mAVStream->nb_frames;
return {};
}
void SetFramesCount(int64_t nb_frames) noexcept override
{
if (mAVStream != nullptr)
mAVStream->nb_frames = nb_frames;
}
int GetDisposition() const noexcept override
{
if (mAVStream != nullptr)
return mAVStream->disposition;
return {};
}
void SetDisposition(int disposition) noexcept override
{
if (mAVStream != nullptr)
mAVStream->disposition = disposition;
}
AVSampleFormatFwd GetDiscard() const noexcept override
{
if (mAVStream != nullptr)
return mAVStream->discard;
return {};
}
void SetDiscard(AVDiscardFwd discard) noexcept override
{
if (mAVStream != nullptr)
mAVStream->discard = static_cast<AVDiscard>(discard);
}
AudacityAVRational GetSampleAspectRatio() const noexcept override
{
if (mAVStream != nullptr)
return { mAVStream->sample_aspect_ratio.num,
mAVStream->sample_aspect_ratio.den };
return {};
}
void SetSampleAspectRatio(
AudacityAVRational sample_aspect_ratio) noexcept override
{
if (mAVStream == nullptr)
return;
mAVStream->sample_aspect_ratio.num = sample_aspect_ratio.num;
mAVStream->sample_aspect_ratio.den = sample_aspect_ratio.den;
}
AVDictionaryWrapper GetMetadata() const noexcept override
{
if (mAVStream != nullptr)
return AVDictionaryWrapper(mFFmpeg, mAVStream->metadata);
return AVDictionaryWrapper(mFFmpeg);
}
void SetMetadata(AVDictionaryWrapper metadata) noexcept override
{
if (mAVStream != nullptr) {
// Destroy any previous metadata
if (mAVStream->metadata != nullptr)
mFFmpeg.av_dict_free(&mAVStream->metadata);
// Does this leak or will the stream destroy the dictionary too?
// Not stated here: https://ffmpeg.org/doxygen/trunk/structAVStream.html
// But see: https://ffmpeg.org/doxygen/trunk/libavformat_2utils_8c_source.html#l00635
// And where that function is called: https://ffmpeg.org/doxygen/trunk/libavformat_2utils_8c.html#af8a54ade3869125802dab7fdcd8688b3
// So all is well IF this stream has an AVFormatContext owner
// But note that AVStreamWrapper itself does not free resources
// in its destructor!
mAVStream->metadata = metadata.Release();
}
}
bool IsAudio() const noexcept override
{
if (mAVStream != nullptr)
#if LIBAVFORMAT_VERSION_MAJOR <= 58
return mAVStream->codec->codec_type == AVMEDIA_TYPE_AUDIO;
#else
return mAVStream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO;
#endif
return {};
}
AVCodecIDFwd GetAVCodecID() const noexcept override
{
if (mAVStream != nullptr)
#if LIBAVFORMAT_VERSION_MAJOR <= 58
return mAVStream->codec->codec_id;
#else
return mAVStream->codecpar->codec_id;
#endif
return AV_CODEC_ID_NONE;
}
std::unique_ptr<AVCodecContextWrapper>
GetAVCodecContext() const noexcept override
{
if (mAVStream == nullptr)
return {};
#if LIBAVFORMAT_VERSION_MAJOR <= 58
return mFFmpeg.CreateAVCodecContextWrapper(mAVStream->codec);
#else
// No memory management is involved here!
auto avcodec = mForEncoding ?
mFFmpeg.avcodec_find_encoder(mAVStream->codecpar->codec_id) :
mFFmpeg.avcodec_find_decoder(mAVStream->codecpar->codec_id);
AVCodecContext* codecContext = mFFmpeg.avcodec_alloc_context3(avcodec);
if (codecContext == nullptr)
return {};
auto context = mFFmpeg.CreateAVCodecContextWrapper(codecContext);
if (!mForEncoding)
{
auto ret = mFFmpeg.avcodec_parameters_to_context(
codecContext, mAVStream->codecpar);
if (ret < 0)
return {};
}
return context;
#endif
}
int SetParametersFromContext(AVCodecContextWrapper& context) noexcept
{
#if LIBAVFORMAT_VERSION_MAJOR <= 58
return 0;
#else
return mFFmpeg.avcodec_parameters_from_context(
mAVStream->codecpar, context.GetWrappedValue());
#endif
}
private:
const bool mForEncoding;
};
std::unique_ptr<AVStreamWrapper>
CreateAVStreamWrapper(const FFmpegFunctions& ffmpeg, AVStream* wrapped, bool forEncoding)
{
return std::make_unique<AVStreamWrapperImpl>(
ffmpeg, wrapped, forEncoding);
}
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