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#include "MP4AACDecoder.h"
#include "api.h"
#include <math.h>
#include <bfc/platform/minmax.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 } };
MP4AACDecoder::MP4AACDecoder()
{
preDelay = 0;
decoder = 0;
access_unit = 0;
composition_unit = 0;
isFloat = false;
gain=1.0f;
// get bps
bitsPerSample = AGAVE_API_CONFIG->GetUnsigned(playbackConfigGroupGUID, L"bits", 16);
if (bitsPerSample >= 24) bitsPerSample = 24;
else bitsPerSample = 16;
// get max channels
if (AGAVE_API_CONFIG->GetBool(playbackConfigGroupGUID, L"surround", true))
maxChannels = 6;
else if (AGAVE_API_CONFIG->GetBool(playbackConfigGroupGUID, L"mono", false))
maxChannels = 1;
else
maxChannels = 2;
}
int MP4AACDecoder::Open()
{
/* with FhG's API, we can't actually create a decoder until we have the ASC.
best we can do right now is create the access unit object */
access_unit = CAccessUnit_Create(0, 0);
if (access_unit)
return MP4_SUCCESS;
else
return MP4_FAILURE;
}
int MP4AACDecoder::OpenEx(size_t _bits, size_t _maxChannels, bool useFloat)
{
isFloat = useFloat;
if (isFloat)
{
bitsPerSample = 32;
}
else
{
if (_bits)
bitsPerSample = _bits;
if (bitsPerSample >= 24) bitsPerSample = 24;
else bitsPerSample = 16;
}
if (_maxChannels)
maxChannels = _maxChannels;
return Open();
}
int MP4AACDecoder::GetOutputProperties(unsigned int *sampleRate, unsigned int *channels, unsigned int *_bitsPerSample)
{
bool dummy;
return GetOutputPropertiesEx(sampleRate, channels, _bitsPerSample, &dummy);
}
int MP4AACDecoder::GetOutputPropertiesEx(unsigned int *sampleRate, unsigned int *channels, unsigned int *_bitsPerSample, bool *useFloat)
{
/* TODO: verify that it's safe to call these, e.g. one frame has been decoded successfully, otherwise call MKV_NEED_MORE_INPUT */
CCompositionUnit_GetSamplingRate(composition_unit, sampleRate);
CCompositionUnit_GetChannels(composition_unit, channels);
*_bitsPerSample = bitsPerSample;
*useFloat = isFloat;
return MP4_SUCCESS;
}
void MP4AACDecoder::Flush()
{
mp4AudioDecoder_Reset(decoder, MP4AUDIODECPARAM_DEFAULT, 0);
}
int MP4AACDecoder::GetCurrentBitrate(unsigned int *bitrate)
{
int current_bitrate;
if (CCompositionUnit_GetProperty(composition_unit, CUBUFFER_CURRENTBITRATE, ¤t_bitrate) == MP4AUDIODEC_OK)
{
*bitrate = current_bitrate/1000;
return MP4_SUCCESS;
}
else
return MP4_GETCURRENTBITRATE_UNKNOWN;
}
int MP4AACDecoder::DecodeSample(void *inputBuffer, size_t inputBufferBytes, void *outputBuffer, size_t *outputBufferBytes)
{
CAccessUnit_Reset(access_unit);
CAccessUnit_Assign(access_unit, (const unsigned char *)inputBuffer, inputBufferBytes);
CCompositionUnit_Reset(composition_unit);
MP4_RESULT result = mp4AudioDecoder_DecodeFrame(decoder, &access_unit, composition_unit);
if (result == MP4AUDIODEC_OK)
{
unsigned int channels;
unsigned int samples_per_channel;
if (CCompositionUnit_GetSamplesPerChannel(composition_unit, &samples_per_channel) != MP4AUDIODEC_OK
|| CCompositionUnit_GetChannels(composition_unit, &channels) != MP4AUDIODEC_OK)
return MP4_FAILURE;
const float *audio_output = 0;
size_t num_samples = samples_per_channel * channels;
size_t output_size = num_samples * (bitsPerSample/8);
if (output_size > *outputBufferBytes)
return MP4_FAILURE;
*outputBufferBytes = output_size;
CCompositionUnit_GetPcmPtr(composition_unit, &audio_output);
if (!isFloat)
{
nsutil_pcm_FloatToInt_Interleaved_Gain(outputBuffer, audio_output, bitsPerSample, num_samples, gain/32768.0f);
}
else
{
for (size_t i = 0;i != num_samples;i++)
((float *)outputBuffer)[i] = audio_output[i] * gain / 32768.0f;
}
return MP4_SUCCESS;
}
else
return MP4_FAILURE;
}
int MP4AACDecoder::OutputFrameSize(size_t *frameSize)
{
if (!decoder)
return MP4_FAILURE;
unsigned int samples_per_channel;
unsigned int channels;
if (CCompositionUnit_GetSamplesPerChannel(composition_unit, &samples_per_channel) != MP4AUDIODEC_OK
|| CCompositionUnit_GetChannels(composition_unit, &channels) != MP4AUDIODEC_OK)
return MP4_FAILURE;
*frameSize = samples_per_channel*channels;
return MP4_SUCCESS;
}
int MP4AACDecoder::AudioSpecificConfiguration(void *buffer, size_t buffer_size) // reads ASC block from mp4 file
{
// TODO: error check
if (buffer && buffer_size)
{
CSAudioSpecificConfig asc;
memset(&asc, 0, sizeof(asc));
if (mp4AudioDecoder_ascParse((const unsigned char *)buffer, buffer_size, &asc) == MP4AUDIODEC_OK)
{
CSAudioSpecificConfig *asc_array = &asc;;
decoder = mp4AudioDecoder_Create(&asc_array, 1);
if (decoder)
{
mp4AudioDecoder_SetParam(decoder, TDL_MODE, SWITCH_OFF);
mp4AudioDecoder_SetParam(decoder, CONCEALMENT_ENERGYINTERPOLATION, SWITCH_OFF);
composition_unit = CCompositionUnit_Create(max(asc.m_channels, 8), asc.m_samplesPerFrame * 2, asc.m_samplingFrequency, 6144, CUBUFFER_PCMTYPE_FLOAT);
return MP4_SUCCESS;
}
}
}
return MP4_FAILURE;
}
void MP4AACDecoder::Close()
{
mp4AudioDecoder_Destroy(&decoder);
CAccessUnit_Destroy(&access_unit);
CCompositionUnit_Destroy(&composition_unit);
}
int MP4AACDecoder::CanHandleCodec(const char *codecName)
{
return !strcmp(codecName, "mp4a");
}
int MP4AACDecoder::CanHandleType(uint8_t type)
{
switch (type)
{
case MP4_TYPE_MPEG4_AUDIO:
return 1;
case MP4_TYPE_MPEG2_AAC_LC_AUDIO:
return 1;
default:
return 0;
}
}
int MP4AACDecoder::CanHandleMPEG4Type(uint8_t type)
{
switch (type)
{
case MP4_MPEG4_TYPE_AAC_LC_AUDIO:
case MP4_MPEG4_TYPE_AAC_HE_AUDIO:
case MP4_MPEG4_TYPE_PARAMETRIC_STEREO:
return 1;
default:
return 0;
}
}
#ifdef CBCLASS
#undef CBCLASS
#endif
#define CBCLASS MP4AACDecoder
START_DISPATCH;
CB(MPEG4_AUDIO_OPEN, Open)
CB(MPEG4_AUDIO_OPEN_EX, OpenEx)
CB(MPEG4_AUDIO_ASC, AudioSpecificConfiguration)
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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