/* Send audio to the group chat.
*
* return 0 on success.
* return -1 on failure.
*/
int group_send_audio(Group_Chats *g_c, int groupnumber, const int16_t *pcm, unsigned int samples, uint8_t channels,
unsigned int sample_rate)
{
Group_AV *group_av = group_get_object(g_c, groupnumber);
if (!group_av)
return -1;
if (channels != 1 && channels != 2)
return -1;
//TODO: allow different sample rates
if (sample_rate != 48000)
return -1;
if (!group_av->audio_encoder || group_av->audio_channels != channels || group_av->audio_sample_rate != sample_rate) {
group_av->audio_channels = channels;
group_av->audio_sample_rate = sample_rate;
group_av->audio_bitrate = 64000; //TODO: add way of adjusting bitrate
if (recreate_encoder(group_av) == -1)
return -1;
}
uint8_t encoded[1024];
int32_t size = opus_encode(group_av->audio_encoder, pcm, samples, encoded, sizeof(encoded));
if (size <= 0)
return -1;
return send_audio_packet(g_c, groupnumber, encoded, size);
}
/* Send an encoded audio packet to the group chat.
*
* return 0 on success.
* return -1 on failure.
*/
static int send_audio_packet(Group_Chats *g_c, int groupnumber, uint8_t *packet, uint16_t length)
{
if (!length)
return -1;
Group_AV *group_av = group_get_object(g_c, groupnumber);
uint8_t data[1 + sizeof(uint16_t) + length];
data[0] = GROUP_AUDIO_PACKET_ID;
uint16_t sequnum = htons(group_av->audio_sequnum);
memcpy(data + 1, &sequnum, sizeof(sequnum));
memcpy(data + 1 + sizeof(sequnum), packet, length);
if (send_group_lossy_packet(g_c, groupnumber, data, sizeof(data)) == -1)
return -1;
++group_av->audio_sequnum;
return 0;
}
