2015-09-06 19:57:33 +02:00
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#include "./mpegaudioframe.h"
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2015-09-06 15:42:18 +02:00
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2015-09-06 19:57:33 +02:00
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#include "../exceptions.h"
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2015-04-22 19:22:01 +02:00
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#include <c++utilities/io/binaryreader.h>
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using namespace std;
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using namespace IoUtilities;
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namespace Media {
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2015-07-31 01:09:41 +02:00
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/*!
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* \brief Returns the string representation for the specified \a channelMode.
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*/
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const char *mpegChannelModeString(MpegChannelMode channelMode)
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{
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switch(channelMode) {
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case MpegChannelMode::Stereo: return "2 channels: stereo";
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case MpegChannelMode::JointStereo: return "2 channels: joint stereo";
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case MpegChannelMode::DualChannel: return "2 channels: dual channel";
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case MpegChannelMode::SingleChannel: return "1 channel: single channel";
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2015-09-19 23:42:05 +02:00
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default: return nullptr;
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2015-07-31 01:09:41 +02:00
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}
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}
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2015-04-22 19:22:01 +02:00
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const uint64 MpegAudioFrame::m_xingHeaderOffset = 0x24;
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/*!
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* \class Media::MpegAudioFrame
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* \brief The MpegAudioFrame class is used to parse MPEG audio frames.
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*/
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const int MpegAudioFrame::m_bitrateTable[0x2][0x3][0xF] =
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{
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{{0,32,64,96,128,160,192,224,256,288,320,352,384,416,448},
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{0,32,48,56,64,80,96,112,128,160,192,224,256,320,384},
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{0,32,40,48,56,64,80,96,112,128,160,192,224,256,320}},
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{{0,32,48,56,64,80,96,112,128,144,160,176,192,224,256},
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{0,8,16,24,32,40,48,56,64,80,96,112,128,144,160},
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{0,8,16,24,32,40,48,56,64,80,96,112,128,144,160}}
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};
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const uint32 MpegAudioFrame::m_sync = 0xFFE00000u;
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/*!
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2015-07-15 00:10:24 +02:00
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* \brief Parses the header read using the specified \a reader.
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2015-04-22 19:22:01 +02:00
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* \throws Throws InvalidDataException if the data read from the stream is
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* no valid frame header.
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*/
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2015-07-15 00:10:24 +02:00
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void MpegAudioFrame::parseHeader(BinaryReader &reader)
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{
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m_header = reader.readUInt32BE();
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2015-07-31 01:09:41 +02:00
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if(!isValid()) {
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throw InvalidDataException();
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}
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reader.stream()->seekg(m_xingHeaderOffset - 4, ios_base::cur);
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m_xingHeader = reader.readUInt64BE();
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m_xingHeaderFlags = static_cast<XingHeaderFlags>(m_xingHeader & 0xffffffffuL);
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if(isXingHeaderAvailable()) {
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if(isXingFramefieldPresent()) {
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m_xingFramefield = reader.readUInt32BE();
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}
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if(isXingBytesfieldPresent()) {
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m_xingBytesfield = reader.readUInt32BE();
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}
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if(isXingTocFieldPresent()) {
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2015-07-15 00:10:24 +02:00
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reader.stream()->seekg(64, ios_base::cur);
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}
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if(isXingQualityIndicatorFieldPresent()) {
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m_xingQualityIndicator = reader.readUInt32BE();
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}
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}
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}
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/*!
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* \brief Returns the MPEG version if known (1.0, 2.0 or 2.5); otherwise returns 0.
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*/
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double MpegAudioFrame::mpegVersion() const
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{
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switch(m_header & 0x180000u) {
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case 0x180000u:
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return 1.0;
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case 0x100000u:
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return 2.0;
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case 0x0u:
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return 2.5;
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default:
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return 0.0;
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}
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}
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/*!
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* \brief Returns the MPEG layer if known (1, 2, or 3); otherwise returns 0.
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*/
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int MpegAudioFrame::layer() const
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{
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switch (m_header & 0x60000u) {
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case 0x60000u:
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return 1;
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case 0x40000u:
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return 2;
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case 0x20000u:
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return 3;
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default:
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return 0;
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}
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}
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/*!
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2015-07-31 01:09:41 +02:00
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* \brief Returns the sampeling frequency of the frame if known; otherwise returns 0.
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2015-04-22 19:22:01 +02:00
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*/
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2015-07-31 01:09:41 +02:00
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uint32 MpegAudioFrame::samplingFrequency() const
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{
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switch (m_header & 0xc00u) {
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case 0xc00u:
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return 0;
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case 0x800u:
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switch (m_header & 0x180000u) {
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case 0x180000u:
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return 32000;
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case 0x100000u:
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return 16000;
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case 0x0u:
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return 8000u;
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}
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break;
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case 0x400u:
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switch (m_header & 0x180000u) {
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case 0x180000u:
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return 48000;
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case 0x100000u:
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return 24000;
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case 0x0u:
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return 12000;
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}
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break;
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case 0x0u:
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switch (m_header & 0x180000u) {
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case 0x180000u:
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return 44100;
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case 0x100000:
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return 22050;
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case 0x0u:
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return 11025;
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}
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break;
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}
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return 0;
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}
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/*!
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* \brief Returns the channel mode if known; otherwise returns MpegChannelMode::Unspecifed.
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*/
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MpegChannelMode MpegAudioFrame::channelMode() const
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{
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if(isValid()) {
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switch (m_header & 0xc0u) {
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case 0xc0u:
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return MpegChannelMode::SingleChannel;
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case 0x80u:
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return MpegChannelMode::DualChannel;
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case 0x40u:
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return MpegChannelMode::JointStereo;
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case 0x00:
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return MpegChannelMode::Stereo;
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default:
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;
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}
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}
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return MpegChannelMode::Unspecifed;
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}
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/*!
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* \brief Returns the sample count if known; otherwise returns 0.
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*/
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uint32 MpegAudioFrame::sampleCount() const
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{
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switch (m_header & 0x60000u) {
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case 0x60000u:
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return 384u;
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case 0x40000u:
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return 1152u;
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case 0x20000u:
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switch (m_header & 0x180000u) {
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case 0x180000u:
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return 1152u;
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case 0x100000u:
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case 0x0u:
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return 576u;
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}
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default:
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;
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}
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return 0;
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}
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/*!
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* \brief Returns the size if known; otherwise retruns 0.
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*/
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uint32 MpegAudioFrame::size() const
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{
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switch (m_header & 0x60000u) {
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case 0x60000u:
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2015-07-31 01:09:41 +02:00
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return static_cast<uint32>(((static_cast<double>(bitrate()) * 1024.0 / 8.0) / static_cast<double>(samplingFrequency())) * static_cast<double>(sampleCount()) + static_cast<double>(paddingSize()));
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2015-04-22 19:22:01 +02:00
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case 0x40000u:
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case 0x20000u:
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2015-07-31 01:09:41 +02:00
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return static_cast<uint32>(((static_cast<double>(bitrate()) * 1024.0 / 8.0) / static_cast<double>(samplingFrequency())) * static_cast<double>(sampleCount()) + static_cast<double>(paddingSize()));
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2015-04-22 19:22:01 +02:00
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default:
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return 0;
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}
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}
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}
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