func NewAudioFrame(sampleFormat int32, channels, nb_samples int) (*Frame, error) {
this := NewFrame()
this.mediaType = AVMEDIA_TYPE_AUDIO
this.SetNbSamples(nb_samples)
this.SetFormat(sampleFormat)
this.SetChannelLayout(channels)
//the codec gives us the frame size, in samples,
//we calculate the size of the samples buffer in bytes
size := C.av_samples_get_buffer_size(nil, C.int(channels), C.int(nb_samples),
sampleFormat, 0)
if size < 0 {
return nil, errors.New("Could not get sample buffer size")
}
samples := (*_Ctype_uint8_t)(C.av_malloc(C.size_t(size)))
if samples == nil {
return nil, errors.New(fmt.Sprintf("Could not allocate %d bytes for samples buffer", size))
}
//setup the data pointers in the AVFrame
ret := int(C.avcodec_fill_audio_frame(this.avFrame, C.int(channels), sampleFormat,
samples, C.int(size), 0))
if ret < 0 {
return nil, errors.New("Could not setup audio frame")
}
return this, nil
}
//Fill Frame audio data and linesize pointers.
func AvcodecFillAudioFrame(f *Frame, c int, s AvSampleFormat, b *uint8, bs, a int) int {
return int(C.avcodec_fill_audio_frame((*C.struct_AVFrame)(f), C.int(c), (C.enum_AVSampleFormat)(s), (*C.uint8_t)(b), C.int(bs), C.int(a)))
}