bool CDVDAudioCodecPcm::Open(CDVDStreamInfo &hints, CDVDCodecOptions &options)
{
SetDefault();
m_codecID = hints.codec;
m_iSourceChannels = hints.channels;
m_iSourceSampleRate = hints.samplerate;
m_iSourceBitrate = 16;
switch (m_codecID)
{
case CODEC_ID_PCM_ALAW:
{
for (int i = 0; i < 256; i++) table[i] = alaw2linear(i);
break;
}
case CODEC_ID_PCM_MULAW:
{
for (int i = 0; i < 256; i++) table[i] = ulaw2linear(i);
break;
}
default:
{
break;
}
}
// set desired output
m_iOutputChannels = m_iSourceChannels;
return true;
}
void UlawToPcmFilter::AudioChunkIn(AudioChunkRef& inputAudioChunk)
{
m_outputAudioChunk.reset();
if(inputAudioChunk.get() == NULL)
{
return;
}
else if(inputAudioChunk->GetNumSamples() == 0)
{
return;
}
AudioChunkDetails outputDetails = *inputAudioChunk->GetDetails();
if(SupportsInputRtpPayloadType(outputDetails.m_rtpPayloadType) == false)
{
return;
}
// Create output buffer
m_outputAudioChunk.reset(new AudioChunk());
outputDetails.m_rtpPayloadType = -1; // Override details that this filter changes
outputDetails.m_encoding = PcmAudio;
int numSamples = inputAudioChunk->GetNumSamples();
outputDetails.m_numBytes = numSamples*2;
short* outputBuffer = (short*)m_outputAudioChunk->CreateBuffer(outputDetails);
char* inputBuffer = (char*)inputAudioChunk->m_pBuffer;
for(int i=0; i<numSamples; i++)
{
outputBuffer[i] = (short)ulaw2linear(inputBuffer[i]);
}
}
static av_cold int pcm_decode_init(AVCodecContext * avctx)
{
PCMDecode *s = avctx->priv_data;
int i;
switch(avctx->codec->id) {
case CODEC_ID_PCM_ALAW:
for(i=0;i<256;i++)
s->table[i] = alaw2linear(i);
break;
case CODEC_ID_PCM_MULAW:
for(i=0;i<256;i++)
s->table[i] = ulaw2linear(i);
break;
default:
break;
}
avctx->sample_fmt = avctx->codec->sample_fmts[0];
if (avctx->sample_fmt == SAMPLE_FMT_S32)
avctx->bits_per_raw_sample = av_get_bits_per_sample(avctx->codec->id);
return 0;
}
int PCMUCodec::Decode (BYTE *in,int inLen,WORD* out,int outLen)
{
//Comprobamos las longitudes
if (outLen<inLen)
return 0;
//Decodificamos
for (int j = 0; j< inLen ;j++)
out[j]=ulaw2linear(in[j]);
return inLen;
}
/* Decodes one byte PCMU data to two bytes unsigned linear data */
static int
vocoder_ulaw(int fd, u_char *pl, int len)
{
u_int16_t wbuf[2048];
int i = 0;
int wlen = len * sizeof(u_int16_t);
for (i = 0; i < len && (i < sizeof(wbuf) / sizeof(u_int16_t)); i++)
wbuf[i] = ulaw2linear(pl[i]);
if (write(fd, wbuf, wlen) < wlen)
return -1;
return wlen;
}
//#define ECHO
thread basic_receive(ushort uart, ushort udp)
{
uint len = 0;
uchar buf[BUF_SIZE];
#ifdef ECHO
int i, j = 0;
uint value[5 * BUF_SIZE];
#endif
/* Enable all interrupts */
enable();
while (TRUE)
{
/* Read from the UDP device */
len = read(udp, buf, BUF_SIZE);
if (len > 0)
{
#ifdef ECHO
/* Echo audio effect */
for (i = 0; i < len; i++)
{
value[j] =
value[(j + BUF_SIZE) % (5 * BUF_SIZE)] * 4 / 5 +
ulaw2linear(buf[i]) / 64 + 512;
buf[i] = linear2ulaw((value[j] - 512) * 64);
j = (j + 1) % (5 * BUF_SIZE);
}
#endif
/* Write to the serial device */
write(uart, buf, len);
}
}
}
