// Called when the decoder encounters a catestrophic error and cannot // continue. Gecko will not send any more input for decoding.
virtual void Error(GMPErr aError) = 0;
};
#define GMP_API_VIDEO_DECODER "decode-video"
// Video decoding for a single stream. A GMP may be asked to create multiple // decoders concurrently. // // API name macro: GMP_API_VIDEO_DECODER // Host API: GMPVideoHost // // ALL METHODS MUST BE CALLED ON THE MAIN THREAD class GMPVideoDecoder {
public:
virtual ~GMPVideoDecoder() {}
// - aCodecSettings: Details of decoder to create. // - aCodecSpecific: codec specific data, cast to a GMPVideoCodecXXX struct // to get codec specific config data. // - aCodecSpecificLength: number of bytes in aCodecSpecific. // - aCallback: Subclass should retain reference to it until DecodingComplete // is called. Do not attempt to delete it, host retains // ownership. // aCoreCount: number of CPU cores.
virtual void InitDecode(const GMPVideoCodec& aCodecSettings, const uint8_t* aCodecSpecific,
uint32_t aCodecSpecificLength,
GMPVideoDecoderCallback* aCallback,
int32_t aCoreCount) = 0;
// Decode encoded frame (as a part of a video stream). The decoded frame // will be returned to the user through the decode complete callback. // // - aInputFrame: Frame to decode. Call Destroy() on frame when it's decoded. // - aMissingFrames: True if one or more frames have been lost since the // previous decode call. // - aCodecSpecificInfo : codec specific data, pointer to a // GMPCodecSpecificInfo structure appropriate for // this codec type. // - aCodecSpecificInfoLength : number of bytes in aCodecSpecificInfo // - renderTimeMs : System time to render in milliseconds. Only used by // decoders with internal rendering.
virtual void Decode(GMPVideoEncodedFrame* aInputFrame, bool aMissingFrames, const uint8_t* aCodecSpecificInfo,
uint32_t aCodecSpecificInfoLength,
int64_t aRenderTimeMs = -1) = 0;
// Reset decoder state and prepare for a new call to Decode(...). // Flushes the decoder pipeline. // The decoder should enqueue a task to run ResetComplete() on the main // thread once the reset has finished.
virtual void Reset() = 0;
// Output decoded frames for any data in the pipeline, regardless of ordering. // All remaining decoded frames should be immediately returned via callback. // The decoder should enqueue a task to run DrainComplete() on the main // thread once the reset has finished.
virtual void Drain() = 0;
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