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// used to decode an MPEG-1 audio object in an MPEG-4 ISO Media file
#include "mp3_in_mp4.h"
#include "api__mp3-mpg123.h"
#include "../nsutil/pcm.h"
// {B6CB4A7C-A8D0-4c55-8E60-9F7A7A23DA0F}
static const GUID playbackConfigGroupGUID =
{ 0xb6cb4a7c, 0xa8d0, 0x4c55, { 0x8e, 0x60, 0x9f, 0x7a, 0x7a, 0x23, 0xda, 0xf } };
#define FHG_DELAY 529
MPEG4_MP3::MPEG4_MP3()
{
channels = 0;
gain = 1;
floatingPoint = false;
decoder = 0;
sample_rate = 0;
bits = 16;
pregap = FHG_DELAY;
}
MPEG4_MP3::~MPEG4_MP3()
{
if (decoder) {
mpg123_delete(decoder);
decoder = 0;
}
}
int MPEG4_MP3::OpenEx(size_t _bits, size_t _maxChannels, bool useFloat)
{
_bits = bits;
floatingPoint = useFloat;
if (floatingPoint)
bits = 32;
else
bits = (int)_bits;
decoder = mpg123_new(NULL, NULL);
long flags = MPG123_QUIET|MPG123_FORCE_FLOAT|MPG123_SKIP_ID3V2|MPG123_IGNORE_STREAMLENGTH|MPG123_IGNORE_INFOFRAME;
if (_maxChannels == 1) {
flags |= MPG123_FORCE_MONO;
}
mpg123_param(decoder, MPG123_FLAGS, flags, 0);
mpg123_param(decoder, MPG123_RVA, MPG123_RVA_OFF, 0);
mpg123_open_feed(decoder);
return MP4_SUCCESS;
}
const char *MPEG4_MP3::GetCodecInfoString()
{
return 0;
}
int MPEG4_MP3::CanHandleCodec(const char *codecName)
{
if (!lstrcmpA(codecName, "mp4a"))
return 1;
else
return 0;
}
int MPEG4_MP3::CanHandleType(unsigned __int8 type)
{
switch(type)
{
case MP4_MPEG4_LAYER3_AUDIO:
case MP4_MPEG4_LAYER2_AUDIO:
case MP4_MPEG4_LAYER1_AUDIO:
case MP4_TYPE_MPEG1_AUDIO:
case MP4_TYPE_MPEG2_AUDIO:
//case MP4_TYPE_MPEG4_AUDIO:
return 1;
default:
return 0;
}
}
int MPEG4_MP3::DecodeSample(void *inputBuffer, size_t inputBufferBytes, void *outputBuffer, size_t *outputBufferBytes)
{
if (!decoder)
return MP4_FAILURE;
*outputBufferBytes = 0;
mpg123_feed(decoder, (unsigned char *)inputBuffer, inputBufferBytes);
for (;;) {
// get the decoded data out
size_t pcm_buf_used=0;
float decodeBuf[1152*2];
int err = mpg123_read(decoder, (unsigned char *)decodeBuf, sizeof(decodeBuf), &pcm_buf_used);
if (pcm_buf_used) {
if (!_UpdateProperties()) {
return MP4_FAILURE;
}
// deal with pregap
int numSamples = (int)pcm_buf_used / sizeof(float);
int offset = min(numSamples, pregap * channels);
numSamples -= offset;
pregap -= offset / channels;
float *pcm_buf = decodeBuf + offset;
// convert to destination sample format
nsutil_pcm_FloatToInt_Interleaved(outputBuffer, pcm_buf, bits, numSamples);
*outputBufferBytes += numSamples * bits / 8;
outputBuffer = (char *)outputBuffer + numSamples * bits / 8;
return MP4_SUCCESS;
} else if (err == MPG123_NEED_MORE) {
*outputBufferBytes = 0;
return MP4_NEED_MORE_INPUT;
} else if (err == MPG123_NEW_FORMAT) {
continue;
} else if (err == MPG123_OK) {
continue;
}
else
return MP4_FAILURE;
}
return MP4_SUCCESS;
}
bool MPEG4_MP3::_UpdateProperties()
{
if (decoder && (!channels || !sample_rate)) {
long sample_rate = 44100;
int channels = 2;
int encoding = 0;
if (mpg123_getformat(decoder, &sample_rate, &channels, &encoding) == MPG123_OK) {
this->channels = channels;
this->sample_rate = sample_rate;
}
}
return channels && sample_rate;
}
int MPEG4_MP3::GetOutputPropertiesEx(unsigned int *sampleRate, unsigned int *channels, unsigned int *bitsPerSample, bool *isFloat)
{
if (_UpdateProperties()) {
*sampleRate = this->sample_rate;
*channels = this->channels;
*bitsPerSample = bits;
*isFloat = floatingPoint;
return MP4_SUCCESS;
} else {
return MP4_FAILURE;
}
}
int MPEG4_MP3::GetOutputProperties(unsigned int *sampleRate, unsigned int *channels, unsigned int *bitsPerSample)
{
bool dummy;
return GetOutputPropertiesEx(sampleRate, channels, bitsPerSample, &dummy);
}
void MPEG4_MP3::Close()
{
if (decoder) {
mpg123_delete(decoder);
decoder = 0;
}
}
void MPEG4_MP3::Flush()
{
mpg123_open_feed(decoder);
pregap = FHG_DELAY;
}
int MPEG4_MP3::SetGain(float _gain)
{
gain = _gain;
return MP4_SUCCESS;
}
int MPEG4_MP3::GetCurrentBitrate(unsigned int *bitrate)
{
mpg123_frameinfo frameInfo;
if (mpg123_info(decoder, &frameInfo) == MPG123_OK) {
*bitrate = frameInfo.bitrate;
return MP4_SUCCESS;
} else {
return MP4_FAILURE;
}
}
int MPEG4_MP3::OutputFrameSize(size_t *frameSize)
{
if (_UpdateProperties()) {
*frameSize = (bits/8) * channels * mpg123_spf(decoder);
return MP4_SUCCESS;
} else {
return MP4_FAILURE;
}
}
int MPEG4_MP3::CanHandleMPEG4Type(unsigned __int8 type)
{
switch (type)
{
case MP4_MPEG4_LAYER1_AUDIO:
case MP4_MPEG4_LAYER2_AUDIO:
case MP4_MPEG4_LAYER3_AUDIO:
return 1;
default:
return 0;
}
}
#define CBCLASS MPEG4_MP3
START_DISPATCH;
CB(MPEG4_AUDIO_OPEN_EX, OpenEx)
CB(MPEG4_AUDIO_CODEC_INFO_STRING, GetCodecInfoString)
CB(MPEG4_AUDIO_BITRATE, GetCurrentBitrate)
CB(MPEG4_AUDIO_FRAMESIZE, OutputFrameSize)
CB(MPEG4_AUDIO_OUTPUTINFO, GetOutputProperties)
CB(MPEG4_AUDIO_OUTPUTINFO_EX, GetOutputPropertiesEx)
CB(MPEG4_AUDIO_DECODE, DecodeSample)
VCB(MPEG4_AUDIO_FLUSH, Flush)
VCB(MPEG4_AUDIO_CLOSE, Close)
CB(MPEG4_AUDIO_HANDLES_CODEC, CanHandleCodec)
CB(MPEG4_AUDIO_HANDLES_TYPE, CanHandleType)
CB(MPEG4_AUDIO_HANDLES_MPEG4_TYPE, CanHandleMPEG4Type)
CB(MPEG4_AUDIO_SET_GAIN, SetGain)
END_DISPATCH;
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