AVCodecContext *enc_ctx = NULL, *dec_ctx = NULL;
uint64_t channel_layouts[] = {AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_5POINT1_BACK, AV_CH_LAYOUT_SURROUND, AV_CH_LAYOUT_STEREO_DOWNMIX};
int sample_rates[] = {8000, 44100, 48000, 192000};
AVCodecContext *enc_ctx = NULL, *dec_ctx = NULL;
uint64_t channel_layouts[] = {AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_5POINT1_BACK, AV_CH_LAYOUT_SURROUND, AV_CH_LAYOUT_STEREO_DOWNMIX};
int sample_rates[] = {8000, 44100, 48000, 192000};