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Improved transitions between the different modes

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Uses the PLC to prevent glitches
This commit is contained in:
Jean-Marc Valin 2011-02-15 14:31:21 -05:00
parent 0e0b94a877
commit 606250ab7f
4 changed files with 56 additions and 17 deletions
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52
src/opus_decoder.c
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@ -78,7 +78,10 @@ int opus_decode(OpusDecoder *st, const unsigned char *data,
SKP_SILK_SDK_DecControlStruct DecControl;
SKP_int32 silk_frame_size;
short pcm_celt[960*2];
short pcm_transition[960*2];
int audiosize;
int mode;
int transition=0;
/* Payloads of 1 (2 including ToC) or 0 trigger the PLC/DTX */
if (len<=2)
@ -89,7 +92,7 @@ int opus_decode(OpusDecoder *st, const unsigned char *data,
/* Decoding mode/bandwidth/framesize from first byte */
if (data[0]&0x80)
{
st->mode = MODE_CELT_ONLY;
mode = MODE_CELT_ONLY;
st->bandwidth = BANDWIDTH_MEDIUMBAND + ((data[0]>>5)&0x3);
if (st->bandwidth == BANDWIDTH_MEDIUMBAND)
st->bandwidth = BANDWIDTH_NARROWBAND;
@ -97,12 +100,12 @@ int opus_decode(OpusDecoder *st, const unsigned char *data,
audiosize = (st->Fs<<audiosize)/400;
} else if ((data[0]&0x60) == 0x60)
{
st->mode = MODE_HYBRID;
mode = MODE_HYBRID;
st->bandwidth = (data[0]&0x10) ? BANDWIDTH_FULLBAND : BANDWIDTH_SUPERWIDEBAND;
audiosize = (data[0]&0x08) ? st->Fs/50 : st->Fs/100;
} else {
st->mode = MODE_SILK_ONLY;
mode = MODE_SILK_ONLY;
st->bandwidth = BANDWIDTH_NARROWBAND + ((data[0]>>5)&0x3);
audiosize = ((data[0]>>3)&0x3);
if (audiosize == 3)
@ -118,8 +121,16 @@ int opus_decode(OpusDecoder *st, const unsigned char *data,
ec_dec_init(&dec,(unsigned char*)data,len);
} else {
audiosize = frame_size;
mode = st->prev_mode;
}
if (mode != st->prev_mode
&& !(mode == MODE_SILK_ONLY && st->prev_mode == MODE_HYBRID)
&& !(mode == MODE_HYBRID && st->prev_mode == MODE_SILK_ONLY))
{
transition = 1;
opus_decode(st, NULL, 0, pcm_transition, audiosize, 0);
}
if (audiosize > frame_size)
{
fprintf(stderr, "PCM buffer too small");
@ -129,13 +140,17 @@ int opus_decode(OpusDecoder *st, const unsigned char *data,
}
/* SILK processing */
if (st->mode != MODE_CELT_ONLY)
if (mode != MODE_CELT_ONLY)
{
int lost_flag, decoded_samples;
SKP_int16 *pcm_ptr = pcm;
if (st->prev_mode==MODE_CELT_ONLY)
SKP_Silk_SDK_InitDecoder( st->silk_dec );
DecControl.API_sampleRate = st->Fs;
DecControl.payloadSize_ms = 1000 * audiosize / st->Fs;
if( st->mode == MODE_SILK_ONLY ) {
if( mode == MODE_SILK_ONLY ) {
if( st->bandwidth == BANDWIDTH_NARROWBAND ) {
DecControl.internalSampleRate = 8000;
} else if( st->bandwidth == BANDWIDTH_MEDIUMBAND ) {
@ -169,7 +184,7 @@ int opus_decode(OpusDecoder *st, const unsigned char *data,
pcm[i] = 0;
}
if (st->mode == MODE_HYBRID)
if (mode == MODE_HYBRID)
{
/* This should be adjusted based on the SILK bandwidth */
celt_decoder_ctl(st->celt_dec, CELT_SET_START_BAND(17));
@ -177,7 +192,7 @@ int opus_decode(OpusDecoder *st, const unsigned char *data,
celt_decoder_ctl(st->celt_dec, CELT_SET_START_BAND(0));
}
if (st->mode != MODE_SILK_ONLY)
if (mode != MODE_SILK_ONLY)
{
int endband;
@ -199,16 +214,31 @@ int opus_decode(OpusDecoder *st, const unsigned char *data,
celt_decoder_ctl(st->celt_dec, CELT_SET_END_BAND(endband));
celt_decoder_ctl(st->celt_dec, CELT_SET_CHANNELS(st->stream_channels));
if (st->prev_mode == MODE_SILK_ONLY)
celt_decoder_ctl(st->celt_dec, CELT_RESET_STATE);
/* Decode CELT */
celt_ret = celt_decode_with_ec(st->celt_dec, decode_fec?NULL:data, len, pcm_celt, frame_size, &dec);
for (i=0;i<frame_size*st->channels;i++)
pcm[i] = ADD_SAT16(pcm[i], pcm_celt[i]);
}
if (transition)
{
int tlength;
if (mode == MODE_CELT_ONLY)
tlength = IMIN(audiosize, 10+st->Fs/200);
else
tlength = IMIN(audiosize, 10+st->Fs/400);
for (i=0;i<audiosize;i++)
{
pcm[i] = (i*pcm[i] + (audiosize-i)*pcm_transition[i])/audiosize;
}
}
#if OPUS_TEST_RANGE_CODER_STATE
st->rangeFinal = dec.rng;
#endif
st->prev_mode = mode;
return celt_ret<0 ? celt_ret : audiosize;
}
@ -221,16 +251,10 @@ void opus_decoder_ctl(OpusDecoder *st, int request, ...)
switch (request)
{
case OPUS_SET_MODE_REQUEST:
{
int value = va_arg(ap, int);
st->mode = value;
}
break;
case OPUS_GET_MODE_REQUEST:
{
int *value = va_arg(ap, int*);
*value = st->mode;
*value = st->prev_mode;
}
break;
case OPUS_SET_BANDWIDTH_REQUEST: