94 lines
2.1 KiB
C++
94 lines
2.1 KiB
C++
#include "../nsv/nsvlib.h"
|
|
#include "../nsv/dec_if.h"
|
|
#include "nsvmain.h"
|
|
#include "../nsutil/pcm.h"
|
|
|
|
MP3_Decoder::MP3_Decoder()
|
|
{
|
|
decoder = mpg123_new(NULL, NULL);
|
|
long flags = MPG123_QUIET|MPG123_FORCE_FLOAT|MPG123_SKIP_ID3V2|MPG123_IGNORE_STREAMLENGTH|MPG123_IGNORE_INFOFRAME;
|
|
mpg123_param(decoder, MPG123_FLAGS, flags, 0);
|
|
mpg123_param(decoder, MPG123_RVA, MPG123_RVA_OFF, 0);
|
|
memset(pcm_buf, 0, sizeof(pcm_buf));
|
|
mpg123_open_feed(decoder);
|
|
fused = 0; pcm_buf_used = 0; pcm_offs = 0;
|
|
}
|
|
|
|
int MP3_Decoder::decode(void *in, int in_len,
|
|
void *out, int *out_len,
|
|
unsigned int out_fmt[8])
|
|
{
|
|
int rval = 1;
|
|
if (fused < in_len)
|
|
{
|
|
int l = 4096;
|
|
if (l > in_len - fused) l = in_len - fused;
|
|
if (l) mpg123_feed(decoder, (unsigned char *)in + fused, l);
|
|
fused += l;
|
|
}
|
|
|
|
if (!pcm_buf_used)
|
|
{
|
|
mpg123_read(decoder, (unsigned char *)pcm_buf, sizeof(pcm_buf), &pcm_buf_used);
|
|
|
|
pcm_offs = 0;
|
|
}
|
|
|
|
if (pcm_buf_used)
|
|
{
|
|
size_t numSamples = *out_len / 2;
|
|
if (numSamples > (pcm_buf_used/sizeof(float)))
|
|
numSamples = pcm_buf_used/sizeof(float);
|
|
nsutil_pcm_FloatToInt_Interleaved(out, pcm_buf+pcm_offs, 16, numSamples);
|
|
pcm_buf_used -= numSamples*sizeof(float);
|
|
pcm_offs += (int)numSamples;
|
|
*out_len = 2*(int)numSamples;
|
|
}
|
|
else
|
|
{
|
|
if (fused >= in_len) { fused = 0; rval = 0; }
|
|
*out_len = 0;
|
|
}
|
|
mpg123_frameinfo frameInfo;
|
|
if (mpg123_info(decoder, &frameInfo) == MPG123_OK) {
|
|
int nch = (frameInfo.mode == MPG123_M_MONO)?1:2;
|
|
int srate = frameInfo.rate;
|
|
out_fmt[0] = (nch && srate) ? NSV_MAKETYPE('P', 'C', 'M', ' ') : 0;
|
|
out_fmt[1] = srate;
|
|
out_fmt[2] = nch;
|
|
out_fmt[3] = (nch && srate) ? 16 : 0;
|
|
out_fmt[4] = frameInfo.bitrate;
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
void MP3_Decoder::flush()
|
|
{
|
|
fused = 0;
|
|
pcm_buf_used = 0;
|
|
pcm_offs = 0;
|
|
mpg123_open_feed(decoder);
|
|
}
|
|
|
|
extern "C"
|
|
{
|
|
__declspec(dllexport) IAudioDecoder *CreateAudioDecoder(unsigned int fmt, IAudioOutput **output)
|
|
{
|
|
switch (fmt)
|
|
{
|
|
case NSV_MAKETYPE('M', 'P', '3', ' '):
|
|
return new MP3_Decoder;
|
|
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
__declspec(dllexport) void DeleteAudioDecoder(IAudioDecoder *decoder)
|
|
{
|
|
if (decoder)
|
|
delete decoder;
|
|
|
|
}
|
|
}
|