mirror of
https://github.com/rofafor/vdr-plugin-femon.git
synced 2023-10-10 11:36:53 +00:00
113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
/*
|
|
* Frontend Status Monitor plugin for the Video Disk Recorder
|
|
*
|
|
* See the README file for copyright information and how to reach the author.
|
|
*
|
|
*/
|
|
|
|
#include "femontools.h"
|
|
#include "femonlatm.h"
|
|
|
|
unsigned int cFemonLATM::s_Bitrates[3][16] =
|
|
{
|
|
{0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, -1}, // MPEG-2 Layer I
|
|
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, -1}, // MPEG-2 Layer II/III
|
|
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, -1} // MPEG-2 Layer II/III
|
|
};
|
|
|
|
unsigned int cFemonLATM::s_Samplerates[4] =
|
|
{
|
|
22050, 24000, 16000, -1
|
|
};
|
|
|
|
cFemonLATM::cFemonLATM(cFemonAudioIf *audiohandler)
|
|
: m_AudioHandler(audiohandler)
|
|
{
|
|
}
|
|
|
|
cFemonLATM::~cFemonLATM()
|
|
{
|
|
}
|
|
|
|
bool cFemonLATM::processAudio(const uint8_t *buf, int len)
|
|
{
|
|
cBitStream bs(buf, len * 8);
|
|
|
|
if (!m_AudioHandler)
|
|
return false;
|
|
|
|
// skip PES header
|
|
if (!PesLongEnough(len))
|
|
return false;
|
|
bs.skipBits(8 * PesPayloadOffset(buf));
|
|
|
|
// MPEG audio detection
|
|
if (bs.getBits(12) != 0x56E) // syncword
|
|
return false;
|
|
|
|
if (bs.getBit() == 1) // id: MPEG-1=1, extension to lower sampling frequences=0
|
|
return false;
|
|
int layer = 3 - bs.getBits(2); // layer: I=11, II=10, III=01
|
|
bs.skipBit(); // protection bit
|
|
int bit_rate_index = bs.getBits(4); // bitrate index
|
|
int sampling_frequency = bs.getBits(2); // sampling frequency
|
|
bs.skipBit(); // padding bit
|
|
bs.skipBit(); // private pid
|
|
int mode = bs.getBits(2); // mode
|
|
|
|
m_AudioHandler->SetAudioCodec(AUDIO_CODEC_LATM);
|
|
|
|
switch (mode) {
|
|
case 0:
|
|
m_AudioHandler->SetAudioChannel(AUDIO_CHANNEL_MODE_STEREO);
|
|
break;
|
|
|
|
case 1:
|
|
m_AudioHandler->SetAudioChannel(AUDIO_CHANNEL_MODE_JOINT_STEREO);
|
|
break;
|
|
|
|
case 2:
|
|
m_AudioHandler->SetAudioChannel(AUDIO_CHANNEL_MODE_DUAL);
|
|
break;
|
|
|
|
case 3:
|
|
m_AudioHandler->SetAudioChannel(AUDIO_CHANNEL_MODE_SINGLE);
|
|
break;
|
|
|
|
default:
|
|
m_AudioHandler->SetAudioChannel(AUDIO_CHANNEL_MODE_INVALID);
|
|
break;
|
|
}
|
|
|
|
if (layer == 3) {
|
|
m_AudioHandler->SetAudioBitrate(AUDIO_BITRATE_FREE);
|
|
}
|
|
else {
|
|
switch (bit_rate_index) {
|
|
case 0:
|
|
m_AudioHandler->SetAudioBitrate(AUDIO_BITRATE_FREE);
|
|
break;
|
|
|
|
case 0xF:
|
|
m_AudioHandler->SetAudioBitrate(AUDIO_BITRATE_RESERVED);
|
|
break;
|
|
|
|
default:
|
|
m_AudioHandler->SetAudioBitrate(1000 * s_Bitrates[layer][bit_rate_index]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
switch (sampling_frequency) {
|
|
case 3:
|
|
m_AudioHandler->SetAudioSamplingFrequency(AUDIO_SAMPLING_FREQUENCY_RESERVED);
|
|
break;
|
|
|
|
default:
|
|
m_AudioHandler->SetAudioSamplingFrequency(s_Samplerates[sampling_frequency]);
|
|
break;
|
|
}
|
|
|
|
return true;
|
|
}
|