コード例 #1
0
ファイル: AmAudio.cpp プロジェクト: FihlaTV/sems-amr
// returns bytes read, else -1 if error (0 is OK)
int AmAudio::get(unsigned long long system_ts, unsigned char* buffer, 
		 int output_sample_rate, unsigned int nb_samples)
{
  int size = calcBytesToRead((int)((float)nb_samples * (float)getSampleRate()
				   / (float)output_sample_rate));

  unsigned int rd_ts = scaleSystemTS(system_ts);
  //DBG("\tread(rd_ts = %10.u; size = %u)\n",rd_ts,size);
  size = read(rd_ts,size);
  if(size <= 0){
    return size;
  }

  size = decode(size);
  if(size < 0) {
    DBG("decode returned %i\n",size);
    return -1; 
  }
  size = downMix(size);

  size = resampleOutput((unsigned char*)samples, size, 
			getSampleRate(), output_sample_rate);
  
  if(size>0)
    memcpy(buffer,(unsigned char*)samples,size);

  return size;
}
コード例 #2
0
ファイル: AmAudio.cpp プロジェクト: BackupTheBerlios/sems-svn
// returns bytes read, else -1 if error (0 is OK)
int AmAudio::get(unsigned int user_ts, unsigned char* buffer, unsigned int nb_samples)
{
  int size = calcBytesToRead(nb_samples);

  size = read(user_ts,size);
  //DBG("size = %d\n",size);
  if(size <= 0){
    return size;
  }

  size = decode(size);
  if(size < 0) {
    DBG("decode returned %i\n",size);
    return -1; 
  }
  size = downMix(size);
    
  if(size>0)
    memcpy(buffer,(unsigned char*)samples,size);

  return size;
}
コード例 #3
0
void AmBufferedAudio::input_get_audio(unsigned int user_ts) {
  if (r && (r != w)) {
    // move contents to beginning of buffer
    memmove(output_buffer, &output_buffer[r], w-r);
    w -= r; 
    r = 0;
  }
  while (w < full_buffer_thresh) {
    int size = calcBytesToRead(PCM16_B2S(output_buffer_size - w));

//     DBG("calc %d bytes to read\n", size);
    
    // resync might be delayed until buffer empty     // (but output resync never happens)
    size = read(user_ts + PCM16_B2S(w-r),size);
//     DBG("read returned size = %d\n",size);
    if(size <= 0){
      err_code = size;
      eof = true;
      return;
    }
    
    size = decode(size);
    if(size < 0) {
//       DBG("decode returned %i\n",size);
      err_code = size;
      eof = true;
      return; 
    }

//     DBG("decode returned %i\n",size);
    size = downMix(size);
    
    if(size>0) {
      memcpy(&output_buffer[w],(unsigned char*)samples,size);
      w+=size;
    }
  }
}