func (m *Muxer) writeAudioFrame(frame *C.AVFrame) bool {
for C.av_audio_fifo_size(m.fifo) < 1024 { // generate & store in fifo
C.fill_audio_frame(frame, m.audioStream.stream.codec)
frame_size := frame.nb_samples
if C.av_audio_fifo_realloc(m.fifo, C.av_audio_fifo_size(m.fifo)+frame_size) < 0 {
return false
}
if C.av_audio_fifo_write(m.fifo, (*unsafe.Pointer)(unsafe.Pointer(&frame.data[0])), frame_size) < frame_size {
return false
}
}
got_packet := C.int(0)
for C.av_audio_fifo_size(m.fifo) >= 1024 { // read & encode & write
frame_size := C.min(C.av_audio_fifo_size(m.fifo), m.audioStream.stream.codec.frame_size)
output_frame := C.alloc_audio_frame(m.audioStream.stream.codec)
if C.av_audio_fifo_read(m.fifo, (*unsafe.Pointer)(unsafe.Pointer(&output_frame.data[0])), frame_size) < frame_size {
C.av_frame_free(&output_frame)
return false
}
pkt := C.AVPacket{}
C.av_init_packet(&pkt)
output_frame.pts = C.int64_t(m.audioStream.ts)
m.audioStream.ts += int(m.audioStream.stream.codec.frame_size)
if C.avcodec_encode_audio2(m.audioStream.stream.codec, &pkt, frame, &got_packet) < 0 {
C.av_free_packet(&pkt)
return false
}
if got_packet == 0 {
continue
}
C.av_packet_rescale_ts(&pkt, m.audioStream.stream.codec.time_base, m.audioStream.stream.time_base)
pkt.stream_index = m.audioStream.stream.index
if C.av_interleaved_write_frame(m.context, &pkt) < 0 {
return false
}
}
return true
}
func encode(cc *CodecCtx, avFrame *C.struct_AVFrame, mediaType int32) (*Packet, bool, error) {
var gotOutput int
var ret int
p := NewPacket()
switch mediaType {
case AVMEDIA_TYPE_AUDIO:
ret = int(C.avcodec_encode_audio2(cc.avCodecCtx, &p.avPacket, avFrame, (*C.int)(unsafe.Pointer(&gotOutput))))
if ret < 0 {
return nil, false, errors.New(fmt.Sprintf("Unable to encode video packet, averror: %s", AvError(int(ret))))
}
case AVMEDIA_TYPE_VIDEO:
cc.avCodecCtx.field_order = C.AV_FIELD_PROGRESSIVE
ret = int(C.avcodec_encode_video2(cc.avCodecCtx, &p.avPacket, avFrame, (*C.int)(unsafe.Pointer(&gotOutput))))
if ret < 0 {
return nil, false, errors.New(fmt.Sprintf("Unable to encode video packet, averror: %s", AvError(int(ret))))
}
default:
return nil, false, errors.New(fmt.Sprintf("Unknown codec type: %v", mediaType))
}
return p, (gotOutput > 0), nil
}
//Encode a frame of audio.
func (ctxt *Context) AvcodecEncodeAudio2(p *Packet, f *Frame, gp *int) int {
return int(C.avcodec_encode_audio2((*C.struct_AVCodecContext)(ctxt), (*C.struct_AVPacket)(p), (*C.struct_AVFrame)(f), (*C.int)(unsafe.Pointer(gp))))
}