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#include "avi_mp3_decoder.h"
#include "../nsutil/pcm.h"
#include <assert.h>
int AVIDecoder::CreateAudioDecoder(const nsavi::AVIH *avi_header,
const nsavi::STRH *stream_header, const nsavi::STRF *stream_format, const nsavi::STRD *stream_data,
unsigned int preferred_bits, unsigned int max_channels, bool floating_point,
ifc_aviaudiodecoder **decoder)
{
nsavi::mp3_format *waveformat = (nsavi::mp3_format *)stream_format;
if (waveformat->format.format == nsavi::audio_format_mp3
||waveformat->format.format == nsavi::audio_format_mp2)
{
mpg123_handle *ctx = mpg123_new(NULL, NULL);
if (!ctx)
return CREATEDECODER_FAILURE;
long flags = MPG123_QUIET|MPG123_FORCE_FLOAT|MPG123_SKIP_ID3V2|MPG123_IGNORE_STREAMLENGTH|MPG123_IGNORE_INFOFRAME;
if (max_channels == 1) {
flags |= MPG123_FORCE_MONO;
}
mpg123_param(ctx, MPG123_FLAGS, flags, 0);
mpg123_param(ctx, MPG123_RVA, MPG123_RVA_OFF, 0);
*decoder = new AVIMP3Decoder(ctx, preferred_bits, max_channels, floating_point);
return CREATEDECODER_SUCCESS;
}
return CREATEDECODER_NOT_MINE;
}
#define CBCLASS AVIDecoder
START_DISPATCH;
CB(CREATE_AUDIO_DECODER, CreateAudioDecoder)
END_DISPATCH;
#undef CBCLASS
#define FHG_DELAY 529
AVIMP3Decoder::AVIMP3Decoder(mpg123_handle *mp3, unsigned int bps, unsigned max_channels, bool floating_point)
: mp3(mp3), bits(bps?bps:16), max_channels(max_channels?max_channels:2), floating_point(floating_point), channels(0)
{
mpg123_open_feed(mp3);
pregap = FHG_DELAY;
channels = 0;
decode_buffer=0;
decode_buffer_length=0;
}
AVIMP3Decoder::~AVIMP3Decoder()
{
if (mp3) {
mpg123_delete(mp3);
mp3 = 0;
}
free(decode_buffer);
}
int AVIMP3Decoder::OutputFrameSize(size_t *frame_size)
{
long sample_rate = 44100;
int channels = 2;
int encoding = 0;
if (mpg123_getformat(mp3, &sample_rate, &channels, &encoding) == MPG123_OK) {
this->channels = channels;
}
*frame_size = (bits/8) * channels * mpg123_spf(mp3);
#if 0 // TODO?
if (mp3->GetStreamInfo()->GetLayer() == 1)
*frame_size *= 3;
#endif
return AVI_SUCCESS;
}
int AVIMP3Decoder::GetOutputProperties(unsigned int *sampleRate, unsigned int *_channels, unsigned int *bitsPerSample, bool *isFloat)
{
long sample_rate = 44100;
int channels = 2;
int encoding = 0;
if (mpg123_getformat(mp3, &sample_rate, &channels, &encoding) == MPG123_OK) {
this->channels = channels;
*sampleRate = sample_rate;
*_channels = channels;
*bitsPerSample = bits;
*isFloat = floating_point;
return AVI_SUCCESS;
}
else
{
return AVI_FAILURE;
}
}
int AVIMP3Decoder::DecodeChunk(uint16_t type, void **inputBuffer, size_t *inputBufferBytes, void *outputBuffer, size_t *outputBufferBytes)
{
if (!mp3)
return AVI_FAILURE;
if (inputBufferBytes) {
const uint8_t *mp3_buffer = (const uint8_t *)*inputBuffer;
int err = mpg123_feed(mp3, mp3_buffer, *inputBufferBytes);
if (err == MPG123_OK) {
mp3_buffer += *inputBufferBytes;
*inputBuffer = (void *)mp3_buffer;
*inputBufferBytes = 0;
}
}
size_t output_buffer_len = *outputBufferBytes;
*outputBufferBytes = 0;
for (;;) {
if (!decode_buffer) {
int channels = 2;
long sample_rate;
int encoding;
if (mpg123_getformat(mp3, &sample_rate, &channels, &encoding) == MPG123_OK) {
this->channels = channels;
decode_buffer_length = sizeof(float) * channels * mpg123_spf(mp3);
decode_buffer = (float *)malloc(decode_buffer_length);
if (!decode_buffer) {
return AVI_FAILURE;
}
}
}
// get the decoded data out
// TODO: if floating_point is true and pregap is 0, decode straight into outputBuffer
size_t pcm_buf_used=0;
int err = mpg123_read(mp3, (unsigned char *)decode_buffer, decode_buffer_length, &pcm_buf_used);
if (err == MPG123_NEED_MORE && pcm_buf_used == 0) {
if (*outputBufferBytes == 0) {
return AVI_NEED_MORE_INPUT;
} else {
return AVI_SUCCESS;
}
} else if (err == MPG123_NEW_FORMAT) {
assert(pcm_buf_used == 0);
continue;
} else if (err == MPG123_OK || pcm_buf_used) {
if (!channels) {
long sample_rate = 44100;
int channels = 2;
int encoding = 0;
if (mpg123_getformat(mp3, &sample_rate, &channels, &encoding) == MPG123_OK) {
this->channels = channels;
} else {
return AVI_FAILURE;
}
}
// deal with pregap
size_t numSamples = pcm_buf_used / sizeof(float);
size_t offset = min(numSamples, pregap * channels);
numSamples -= offset;
pregap -= (int)offset / channels;
float *pcm_buf = decode_buffer + offset;
if (numSamples * bits / 8 > output_buffer_len) {
return AVI_SUCCESS;
}
// convert to destination sample format
if (floating_point)
{
memcpy(outputBuffer, pcm_buf, numSamples*bits/8);
}
else
{
nsutil_pcm_FloatToInt_Interleaved_Gain(outputBuffer, pcm_buf, bits, numSamples, 1.0);
}
*outputBufferBytes = *outputBufferBytes + numSamples * bits / 8;
outputBuffer = (char *)outputBuffer + numSamples * bits / 8;
output_buffer_len -= numSamples * bits / 8;
//return AVI_SUCCESS;
} else {
assert(pcm_buf_used == 0);
return AVI_FAILURE;
}
}
return AVI_SUCCESS;
}
void AVIMP3Decoder::Flush()
{
mpg123_open_feed(mp3);
pregap = FHG_DELAY;
}
void AVIMP3Decoder::Close()
{
if (mp3) {
mpg123_delete(mp3);
mp3 = 0;
}
delete this;
}
#define CBCLASS AVIMP3Decoder
START_DISPATCH;
CB(OUTPUT_FRAME_SIZE, OutputFrameSize)
CB(GET_OUTPUT_PROPERTIES, GetOutputProperties)
CB(DECODE_CHUNK, DecodeChunk)
VCB(FLUSH, Flush)
VCB(CLOSE, Close)
END_DISPATCH;
#undef CBCLASS
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