audio MUST be PCM (signed) int16_t, MONO, @48kHz and framesize 120ms, audio bitrate MUST be 12000 bits/second
40000 max bytes length for custom lossless NGC packets.
1372 (MAX_GC_PACKET_CHUNK_SIZE) max bytes length for audio frames and header, but most audio frames will never be near that size anyway.
| what | Length in bytes | Contents |
|---|---|---|
| magic | 6 | 0x667788113435 |
| version | 1 | 0x01 |
| pkt id | 1 | 0x31 |
| audio channels | 1 | uint8_t always 1 (for MONO) |
| sampling freq | 1 | uint8_t always 48 (for 48kHz) |
| data | [1, 1362] | *uint8_t bytes, zero not allowed! |
header size: 10 bytes
data size: 1 - 1362 bytes
do this globally, so you can only send/receive audio for 1 NGC group at a time!
void* toxav_ngc_audio_init(const int32_t bit_rate, const int32_t sampling_rate, const int32_t channel_count);
void toxav_ngc_audio_kill(void *angc);
bool toxav_ngc_audio_encode(void *angc, const int16_t *pcm, const int32_t sample_count_per_frame,
uint8_t *encoded_frame_bytes, uint32_t *encoded_frame_size_bytes);
int32_t toxav_ngc_audio_decode(void *angc, const uint8_t *encoded_frame_bytes,
uint32_t encoded_frame_size_bytes,
int16_t *pcm_decoded);use tox_group_send_custom_packet() and lossless set to false to send audio data
and tox_group_custom_private_packet_cb() to receive audio data.