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/*
* Copyright (C) 2005-2012 Team XBMC
* http://www.xbmc.org
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "DVDPlayerAudioResampler.h"
#include "DVDPlayerAudio.h"
#include "utils/log.h"
#include "utils/MathUtils.h"
#ifdef _WIN32
#pragma comment(lib, "libsamplerate-0.lib")
#endif
CDVDPlayerResampler::CDVDPlayerResampler()
{
m_nrchannels = -1;
m_converter = NULL;
memset(&m_converterdata, 0, sizeof(m_converterdata));
m_converterdata.src_ratio = 1.0;
m_quality = SRC_LINEAR;
m_ratio = 1.0;
m_buffer = NULL;
m_ptsbuffer = NULL;
m_buffersize = 0;
m_bufferfill = 0;
}
CDVDPlayerResampler::~CDVDPlayerResampler()
{
Clean();
}
void CDVDPlayerResampler::Add(DVDAudioFrame &audioframe, double pts)
{
//check if nr of channels changed so we can allocate new buffers if necessary
CheckResampleBuffers(audioframe.channel_count);
//value to divide samples by to get them into -1.0:1.0 range
float scale = (float)(1 << (audioframe.bits_per_sample - 1));
int nrframes = audioframe.size / audioframe.channel_count / (audioframe.bits_per_sample / 8);
//resize sample buffer if necessary
//we want the buffer to be large enough to hold the current frames in it,
//the number of frames needed for libsamplerate's input
//and the maximum number of frames libsamplerate might generate, times 2 for safety
ResizeSampleBuffer(m_bufferfill + nrframes + nrframes * MathUtils::round_int(m_ratio + 0.5) * 2);
//assign samplebuffers
m_converterdata.input_frames = nrframes;
m_converterdata.output_frames = m_buffersize - m_bufferfill - m_converterdata.input_frames;
//output buffer starts at the place where the buffer doesn't hold samples
m_converterdata.data_out = m_buffer + m_bufferfill * m_nrchannels;
//intput buffer is a block of data at the end of the buffer
m_converterdata.data_in = m_converterdata.data_out + m_converterdata.output_frames * m_nrchannels;
//add samples to the resample input buffer
int16_t* inputptr = (int16_t*)audioframe.data;
float* outputptr = m_converterdata.data_in;
for (int i = 0; i < nrframes * m_nrchannels; i++)
*outputptr++ = (float)*inputptr++ / scale;
//resample
m_converterdata.src_ratio = m_ratio;
src_set_ratio(m_converter, m_ratio);
src_process(m_converter, &m_converterdata);
//calculate a pts for each sample
for (int i = 0; i < m_converterdata.output_frames_gen; i++)
{
m_ptsbuffer[m_bufferfill] = pts + i * (audioframe.duration / (double)m_converterdata.output_frames_gen);
m_bufferfill++;
}
}
bool CDVDPlayerResampler::Retrieve(DVDAudioFrame &audioframe, double &pts)
{
//check if nr of channels changed so we can allocate new buffers if necessary
CheckResampleBuffers(audioframe.channel_count);
//value to divide samples by to get them into -1.0:1.0 range
float scale = (float)(1 << (audioframe.bits_per_sample - 1));
int nrframes = audioframe.size / audioframe.channel_count / (audioframe.bits_per_sample / 8);
//if we don't have enough in the samplebuffer, return false
if (nrframes > m_bufferfill)
{
return false;
}
//use the pts of the first fresh value in the samplebuffer
pts = m_ptsbuffer[0];
//add from samplebuffer to audioframe
float* inputptr = m_buffer;
int16_t* outputptr = (int16_t*)audioframe.data;
for (int i = 0; i < nrframes * m_nrchannels; i++)
*outputptr++ = MathUtils::round_int(Clamp(*inputptr++ * scale, scale * -1.0f, scale - 1.0f));
m_bufferfill -= nrframes;
//shift old data to the beginning of the buffer
memmove(m_buffer, m_buffer + (nrframes * m_nrchannels), m_bufferfill * m_nrchannels * sizeof(float));
memmove(m_ptsbuffer, m_ptsbuffer + nrframes, m_bufferfill * sizeof(double));
return true;
}
void CDVDPlayerResampler::CheckResampleBuffers(int channels)
{
int error;
if (channels != m_nrchannels)
{
Clean();
m_nrchannels = channels;
m_converter = src_new(m_quality, m_nrchannels, &error);
}
}
void CDVDPlayerResampler::ResizeSampleBuffer(int nrframes)
{
if (m_buffersize < nrframes)
{
m_buffersize = nrframes * 2;
m_buffer = (float*)realloc(m_buffer, m_buffersize * m_nrchannels * sizeof(float));
m_ptsbuffer = (double*)realloc(m_ptsbuffer, m_buffersize * sizeof(double));
CLog::Log(LOGDEBUG, "CDVDPlayerResampler: resized buffers to hold %i frames", m_buffersize);
}
}
void CDVDPlayerResampler::SetRatio(double ratio)
{
m_ratio = Clamp(ratio, 1.0 / (double)MAXRATIO, (double)MAXRATIO);
}
void CDVDPlayerResampler::Flush()
{
m_bufferfill = 0;
}
void CDVDPlayerResampler::SetQuality(int quality)
{
int qualitylookup[] = {SRC_LINEAR, SRC_SINC_FASTEST, SRC_SINC_MEDIUM_QUALITY, SRC_SINC_BEST_QUALITY};
m_quality = qualitylookup[Clamp(quality, 0, 3)];
Clean();
}
void CDVDPlayerResampler::Clean()
{
if (m_converter) src_delete(m_converter);
m_converter = NULL;
free(m_buffer);
m_buffer = NULL;
free(m_ptsbuffer);
m_ptsbuffer = NULL;
m_bufferfill = 0;
m_buffersize = 0;
m_nrchannels = -1;
m_converterdata.end_of_input = 0;
m_converterdata.src_ratio = 1.0;
m_ratio = 1.0;
}
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