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/*
* See the README file for copyright information and how to reach the author.
*
* $Id$
*/
#include "audio.h"
#include "setup.h"
#include <vdr/tools.h>
#include <vdr/remux.h>
#include <string.h>
cAudioDecoder::cAudioDecoder() :
m_codec(ePCM),
m_outputFormat(ePCM),
m_outputPort(eLocal),
m_channels(0),
m_samplingRate(0),
m_passthrough(false),
m_frame(0),
m_mutex(new cMutex()) { }
cAudioDecoder::~cAudioDecoder()
{
delete m_mutex;
}
int cAudioDecoder::Init(void)
{
int ret = 0;
avcodec_register_all();
m_codecs[ePCM ].codec = NULL;
m_codecs[eMPG ].codec = avcodec_find_decoder(CODEC_ID_MP3);
m_codecs[eAC3 ].codec = avcodec_find_decoder(CODEC_ID_AC3);
m_codecs[eEAC3].codec = avcodec_find_decoder(CODEC_ID_EAC3);
m_codecs[eAAC ].codec = avcodec_find_decoder(CODEC_ID_AAC_LATM);
m_codecs[eDTS ].codec = avcodec_find_decoder(CODEC_ID_DTS);
for (int i = 0; i < eNumCodecs; i++)
{
eCodec codec = static_cast<eCodec>(i);
if (m_codecs[codec].codec)
{
m_codecs[codec].context = avcodec_alloc_context3(m_codecs[codec].codec);
if (!m_codecs[codec].context)
{
esyslog("rpihddevice: failed to allocate %s context!", CodecStr(codec));
ret = -1;
break;
}
if (avcodec_open2(m_codecs[codec].context, m_codecs[codec].codec, NULL) < 0)
{
esyslog("rpihddevice: failed to open %s decoder!", CodecStr(codec));
ret = -1;
break;
}
}
}
m_frame = avcodec_alloc_frame();
if (!m_frame)
{
esyslog("rpihddevice: failed to allocate audio frame!");
ret = -1;
}
if (ret < 0)
DeInit();
return ret;
}
int cAudioDecoder::DeInit(void)
{
for (int i = 0; i < eNumCodecs; i++)
{
eCodec codec = static_cast<eCodec>(i);
avcodec_close(m_codecs[codec].context);
av_free(m_codecs[codec].context);
}
av_free(m_frame);
return 0;
}
bool cAudioDecoder::SetupAudioCodec(const unsigned char *data, int length)
{
m_mutex->Lock();
bool ret = false;
// try to decode audio sample
AVPacket avpkt;
av_init_packet(&avpkt);
avpkt.data = (unsigned char *)(data + PesPayloadOffset(data));
avpkt.size = PesLength(data) - PesPayloadOffset(data);
for (int i = 0; i < eNumCodecs; i++)
{
eCodec codec = static_cast<eCodec>(i);
if (m_codecs[codec].codec)
{
int frame = 0;
avcodec_get_frame_defaults(m_frame);
m_codecs[codec].context->request_channel_layout = AV_CH_LAYOUT_NATIVE;
m_codecs[codec].context->request_channels = 0;
int len = avcodec_decode_audio4(m_codecs[codec].context, m_frame, &frame, &avpkt);
if (len > 0 && frame)
{
m_codec = codec;
m_channels = m_codecs[m_codec].context->channels;
m_samplingRate = m_codecs[m_codec].context->sample_rate;
dsyslog("rpihddevice: set audio codec to %s with %d channels, %dHz",
CodecStr(m_codec), m_channels, m_samplingRate);
m_passthrough = false;
m_outputFormat = ePCM;
m_outputPort = eLocal;
if (cRpiSetup::GetAudioPort() == eHDMI &&
cRpiSetup::IsAudioFormatSupported(ePCM, 2, 48000))
{
m_outputPort = eHDMI;
if (cRpiSetup::IsAudioPassthrough() &&
cRpiSetup::IsAudioFormatSupported(m_codec, m_channels, m_samplingRate))
{
m_passthrough = true;
m_outputFormat = m_codec;
}
dsyslog("rpihddevice: set HDMI audio output format to %s%s",
CodecStr(m_outputFormat), m_passthrough ? " (pass-through)" : "");
}
else
{
m_codecs[m_codec].context->request_channel_layout = AV_CH_LAYOUT_STEREO_DOWNMIX;
m_codecs[m_codec].context->request_channels = 2;
m_channels = 2;
dsyslog("rpihddevice: set analog audio output format to PCM stereo");
}
ret = true;
break;
}
}
}
m_mutex->Unlock();
return ret;
}
unsigned int cAudioDecoder::DecodeAudio(const unsigned char *data, int length, unsigned char *outbuf, int bufsize)
{
m_mutex->Lock();
if (m_passthrough)
{
if (length > bufsize)
esyslog("rpihddevice: pass-through audio frame is bigger than output buffer!");
else
memcpy(outbuf, data, length);
return length;
}
AVPacket avpkt;
av_init_packet(&avpkt);
avpkt.data = (unsigned char *)data;
avpkt.size = length;
unsigned int outsize = 0;
while (avpkt.size > 0)
{
int frame = 0;
avcodec_get_frame_defaults(m_frame);
int len = avcodec_decode_audio4(m_codecs[m_codec].context, m_frame, &frame, &avpkt);
if (len < 0)
break;
if (frame)
{
unsigned int framesize = av_samples_get_buffer_size(NULL,
m_channels == 6 ? 8 : m_channels, m_frame->nb_samples,
m_codecs[m_codec].context->sample_fmt, 1);
if (outsize + framesize <= bufsize)
{
if (m_channels == 6)
{
// interleaved copy to fit 5.1 data into 8 channels
int32_t* src = (int32_t*)m_frame->data[0];
int32_t* dst = (int32_t*)outbuf;
for (int i = 0; i < m_frame->nb_samples; i++)
{
*dst++ = *src++; // LF & RF
*dst++ = *src++; // CF & LFE
*dst++ = *src++; // LR & RR
*dst++ = 0; // empty channels
}
}
else
memcpy(outbuf, m_frame->data[0], framesize);
outsize += framesize;
outbuf += framesize;
}
else
{
esyslog("rpihddevice: decoded audio frame is bigger than output buffer!");
break;
}
}
avpkt.size -= len;
avpkt.data += len;
}
m_mutex->Unlock();
return outsize;
}
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