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 (m *Muxer) routine() {
vFrame := C.alloc_video_frame(m.videoStream.stream.codec)
if vFrame == (*C.AVFrame)(null) {
m.done <- true
return
}
aFrame := C.alloc_audio_frame(m.audioStream.stream.codec)
if aFrame == (*C.AVFrame)(null) {
m.done <- true
return
}
for m.loop {
if C.av_compare_ts(C.int64_t(m.videoStream.ts), m.videoStream.stream.codec.time_base,
C.int64_t(m.audioStream.ts), m.audioStream.stream.codec.time_base) <= 0 {
m.writeVideoFrame(vFrame)
} else {
m.writeAudioFrame(aFrame)
}
time.Sleep(time.Millisecond * 30)
}
if vFrame != (*C.AVFrame)(null) {
C.av_frame_free(&vFrame)
}
if aFrame != (*C.AVFrame)(null) {
C.av_frame_free(&aFrame)
}
m.done <- true
}