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