static int decode_subpacket(COOKContext *q, uint8_t *inbuffer, int sub_packet_size, int16_t *outbuffer) { int i,j; int value; float* tmp_ptr; /* packet dump */ // for (i=0 ; i<sub_packet_size ; i++) { // av_log(NULL, AV_LOG_ERROR, "%02x", inbuffer[i]); // } // av_log(NULL, AV_LOG_ERROR, "\n"); decode_bytes(inbuffer, q->decoded_bytes_buffer, sub_packet_size); init_get_bits(&q->gb, q->decoded_bytes_buffer, sub_packet_size*8); decode_gain_info(&q->gb, &q->gain_current); memcpy(&q->gain_copy, &q->gain_current ,sizeof(COOKgain)); //This copy does not seem to be used. FIXME if(q->nb_channels==2 && q->joint_stereo==1){ joint_decode(q, q->decode_buf_ptr[0], q->decode_buf_ptr[2]); /* Swap buffer pointers. */ tmp_ptr = q->decode_buf_ptr[1]; q->decode_buf_ptr[1] = q->decode_buf_ptr[0]; q->decode_buf_ptr[0] = tmp_ptr; tmp_ptr = q->decode_buf_ptr[3]; q->decode_buf_ptr[3] = q->decode_buf_ptr[2]; q->decode_buf_ptr[2] = tmp_ptr; /* FIXME: Rethink the gainbuffer handling, maybe a rename? now/previous swap */ q->gain_now_ptr = &q->gain_now; q->gain_previous_ptr = &q->gain_previous; for (i=0 ; i<q->nb_channels ; i++){ cook_imlt(q, q->decode_buf_ptr[i*2], q->mono_mdct_output, q->mlt_tmp); gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr, q->gain_previous_ptr, q->previous_buffer_ptr[0]); /* Swap out the previous buffer. */ tmp_ptr = q->previous_buffer_ptr[0]; q->previous_buffer_ptr[0] = q->previous_buffer_ptr[1]; q->previous_buffer_ptr[1] = tmp_ptr; /* Clip and convert the floats to 16 bits. */ for (j=0 ; j<q->samples_per_frame ; j++){ value = lrintf(q->mono_mdct_output[j]); if(value < -32768) value = -32768; else if(value > 32767) value = 32767; outbuffer[2*j+i] = value; } } memcpy(&q->gain_now, &q->gain_previous, sizeof(COOKgain)); memcpy(&q->gain_previous, &q->gain_current, sizeof(COOKgain)); } else if (q->nb_channels==2 && q->joint_stereo==0) { /* channel 0 */ mono_decode(q, q->decode_buf_ptr[0]); tmp_ptr = q->decode_buf_ptr[0]; q->decode_buf_ptr[0] = q->decode_buf_ptr[1]; q->decode_buf_ptr[1] = q->decode_buf_ptr[2]; q->decode_buf_ptr[2] = q->decode_buf_ptr[3]; q->decode_buf_ptr[3] = tmp_ptr; q->gain_now_ptr = &q->gain_now; q->gain_previous_ptr = &q->gain_previous; cook_imlt(q, q->decode_buf_ptr[0], q->mono_mdct_output,q->mlt_tmp); gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr, q->gain_previous_ptr, q->previous_buffer_ptr[0]); /* Swap out the previous buffer. */ tmp_ptr = q->previous_buffer_ptr[0]; q->previous_buffer_ptr[0] = q->previous_buffer_ptr[1]; q->previous_buffer_ptr[1] = tmp_ptr; for (j=0 ; j<q->samples_per_frame ; j++){ value = lrintf(q->mono_mdct_output[j]); if(value < -32768) value = -32768; else if(value > 32767) value = 32767; outbuffer[2*j+1] = value; } /* channel 1 */ //av_log(NULL,AV_LOG_ERROR,"bits = %d\n",get_bits_count(&q->gb)); init_get_bits(&q->gb, q->decoded_bytes_buffer, sub_packet_size*8+q->bits_per_subpacket); decode_gain_info(&q->gb, &q->gain_current); //memcpy(&q->gain_copy, &q->gain_current ,sizeof(COOKgain)); mono_decode(q, q->decode_buf_ptr[0]); tmp_ptr = q->decode_buf_ptr[0]; q->decode_buf_ptr[1] = q->decode_buf_ptr[2]; q->decode_buf_ptr[2] = q->decode_buf_ptr[3]; q->decode_buf_ptr[3] = tmp_ptr; q->gain_now_ptr = &q->gain_now; q->gain_previous_ptr = &q->gain_previous; cook_imlt(q, q->decode_buf_ptr[0], q->mono_mdct_output,q->mlt_tmp); gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr, q->gain_previous_ptr, q->previous_buffer_ptr[0]); /* Swap out the previous buffer. */ tmp_ptr = q->previous_buffer_ptr[0]; q->previous_buffer_ptr[0] = q->previous_buffer_ptr[1]; q->previous_buffer_ptr[1] = tmp_ptr; for (j=0 ; j<q->samples_per_frame ; j++){ value = lrintf(q->mono_mdct_output[j]); if(value < -32768) value = -32768; else if(value > 32767) value = 32767; outbuffer[2*j] = value; } /* Swap out the previous buffer. */ memcpy(&q->gain_now, &q->gain_previous, sizeof(COOKgain)); memcpy(&q->gain_previous, &q->gain_current, sizeof(COOKgain)); } else { mono_decode(q, q->decode_buf_ptr[0]); /* Swap buffer pointers. */ tmp_ptr = q->decode_buf_ptr[1]; q->decode_buf_ptr[1] = q->decode_buf_ptr[0]; q->decode_buf_ptr[0] = tmp_ptr; /* FIXME: Rethink the gainbuffer handling, maybe a rename? now/previous swap */ q->gain_now_ptr = &q->gain_now; q->gain_previous_ptr = &q->gain_previous; cook_imlt(q, q->decode_buf_ptr[0], q->mono_mdct_output,q->mlt_tmp); gain_compensate(q, q->mono_mdct_output, q->gain_now_ptr, q->gain_previous_ptr, q->mono_previous_buffer1); /* Clip and convert the floats to 16 bits */ for (j=0 ; j<q->samples_per_frame ; j++){ value = lrintf(q->mono_mdct_output[j]); if(value < -32768) value = -32768; else if(value > 32767) value = 32767; outbuffer[j] = value; } memcpy(&q->gain_now, &q->gain_previous, sizeof(COOKgain)); memcpy(&q->gain_previous, &q->gain_current, sizeof(COOKgain)); } return q->samples_per_frame * sizeof(int16_t); }