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/**********************************************************************
Audacity: A Digital Audio Editor
AVPacketWrapperImpl.inl
Dmitry Vedenko
**********************************************************************/
class AVPacketWrapperImpl : public AVPacketWrapper
{
public:
explicit
AVPacketWrapperImpl(const FFmpegFunctions& ffmpeg) noexcept
: AVPacketWrapper(ffmpeg)
{
if (mFFmpeg.av_packet_alloc != nullptr)
{
// A library defining one is assumed to define the other
// assert(ffmpeg->av_packet_free != nullptr);
mAVPacket = mFFmpeg.av_packet_alloc();
mUseAVFree = false;
}
else
{
mAVPacket =
static_cast<AVPacket*>(mFFmpeg.av_malloc(sizeof(AVPacket)));
mUseAVFree = true;
}
mFFmpeg.av_init_packet(mAVPacket);
}
AudacityAVBufferRef* GetBuf() const noexcept override
{
if (mAVPacket != nullptr)
return reinterpret_cast<AudacityAVBufferRef*>(mAVPacket->buf);
return {};
}
int64_t GetPresentationTimestamp() const noexcept override
{
if (mAVPacket != nullptr)
return mAVPacket->pts;
return {};
}
int64_t GetDecompressionTimestamp() const noexcept override
{
if (mAVPacket != nullptr)
return mAVPacket->dts;
return {};
}
uint8_t* GetData() const noexcept override
{
if (mAVPacket != nullptr)
return mAVPacket->data;
return {};
}
int GetSize() const noexcept override
{
if (mAVPacket != nullptr)
return mAVPacket->size;
return {};
}
bool OffsetPacket(size_t offset) noexcept override
{
if (mAVPacket == nullptr)
return false;
if (offset >= mAVPacket->size)
{
mAVPacket->data += mAVPacket->size;
mAVPacket->size = 0;
return false;
}
else
{
mAVPacket->data += offset;
mAVPacket->size -= offset;
return true;
}
}
void ResetData() noexcept override
{
if (mAVPacket == nullptr)
return;
mAVPacket->data = nullptr;
mAVPacket->size = 0;
}
void ResetTimestamps() noexcept override
{
if (mAVPacket == nullptr)
return;
mAVPacket->dts = AV_NOPTS_VALUE;
mAVPacket->pts = AV_NOPTS_VALUE;
}
int GetStreamIndex() const noexcept override
{
if (mAVPacket != nullptr)
return mAVPacket->stream_index;
return {};
}
void SetStreamIndex(int index) noexcept override
{
if (mAVPacket != nullptr)
mAVPacket->stream_index = index;
}
int GetFlags() const noexcept override
{
if (mAVPacket != nullptr)
return mAVPacket->flags;
return {};
}
int GetDuration() const noexcept override
{
if (mAVPacket != nullptr)
return mAVPacket->duration;
return {};
}
int64_t GetPos() const noexcept override
{
if (mAVPacket != nullptr)
return mAVPacket->pos;
return {};
}
int64_t GetConvergenceDuration() const noexcept override
{
if (mAVPacket != nullptr)
#if LIBAVFORMAT_VERSION_MAJOR <= 58
return mAVPacket->convergence_duration;
#else
// From FFmpeg docs: "Same as the duration field, but as int64_t."
// duration is int64_t now, convergence_duration is removed
return mAVPacket->duration;
#endif
return {};
}
std::unique_ptr<AVPacketWrapper> Clone() const noexcept override
{
// Guarantee non-null return, which is assumed elsewhere
auto copy = std::make_unique<AVPacketWrapperImpl>(mFFmpeg);
if (mAVPacket == nullptr)
// should happen only if mFFmpeg is null, and should result in
// a clone with null for mAVPacket too
return copy;
// Make mAVPacket in this and the clone share resources
mFFmpeg.av_packet_ref(copy->mAVPacket, mAVPacket);
return std::move(copy);
}
void RescalePresentationTimestamp(AudacityAVRational bq, AudacityAVRational cq)
noexcept override
{
if (mAVPacket == nullptr)
return;
mFFmpeg.av_rescale_q(mAVPacket->pts, { bq.num, bq.den }, { cq.num, cq.den });
}
void RescaleDecompressionTimestamp(AudacityAVRational bq, AudacityAVRational cq)
noexcept override
{
if (mAVPacket == nullptr)
return;
mFFmpeg.av_rescale_q(mAVPacket->dts, { bq.num, bq.den }, { cq.num, cq.den });
}
void RescaleDuration(AudacityAVRational bq, AudacityAVRational cq)
noexcept override
{
if (mAVPacket == nullptr)
return;
mFFmpeg.av_rescale_q(mAVPacket->duration, { bq.num, bq.den }, { cq.num, cq.den });
}
};
std::unique_ptr<AVPacketWrapper> CreateAVPacketWrapper(const FFmpegFunctions& fns)
{
return std::make_unique<AVPacketWrapperImpl>(fns);
}
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