static void alaw_enc_process(MSFilter *obj){ AlawEncData *dt=(AlawEncData*)obj->data; MSBufferizer *bz=dt->bz; uint8_t buffer[2240]; int frame_per_packet=2; int size_of_pcm=320; mblk_t *m; if (dt->ptime>=10) { frame_per_packet = dt->ptime/10; } if (frame_per_packet<=0) frame_per_packet=1; if (frame_per_packet>14) /* 7*20 == 140 ms max */ frame_per_packet=14; size_of_pcm = 160*frame_per_packet; /* ex: for 20ms -> 160*2==320 */ while((m=ms_queue_get(obj->inputs[0]))!=NULL){ ms_bufferizer_put(bz,m); } while (ms_bufferizer_read(bz,buffer,size_of_pcm)==size_of_pcm){ mblk_t *o=allocb(size_of_pcm/2,0); int i; for (i=0;i<size_of_pcm/2;i++){ *o->b_wptr=s16_to_alaw(((int16_t*)buffer)[i]); o->b_wptr++; } mblk_set_timestamp_info(o,dt->ts); dt->ts+=size_of_pcm/2; ms_queue_put(obj->outputs[0],o); } }
static void alaw_encode(short *sample, unsigned char *buf, size_t n) { for (; n > 0; --n) *(buf++) = s16_to_alaw(*(sample++)); }