/// <summary>
/// Entropy code the mid/side quantization indices
/// </summary>
/// <param name="psRangeEnc">I/O Compressor data structure</param>
/// <param name="ix">I Quantization indices [ 2 ][ 3 ]</param>
internal static void silk_stereo_encode_pred(EntropyCoder psRangeEnc, sbyte[][] ix)
{
int n;
/* Entropy coding */
n = 5 * ix[0][2] + ix[1][2];
Inlines.OpusAssert(n < 25);
psRangeEnc.enc_icdf(n, Tables.silk_stereo_pred_joint_iCDF, 8);
for (n = 0; n < 2; n++)
{
Inlines.OpusAssert(ix[n][0] < 3);
Inlines.OpusAssert(ix[n][1] < SilkConstants.STEREO_QUANT_SUB_STEPS);
psRangeEnc.enc_icdf(ix[n][0], Tables.silk_uniform3_iCDF, 8);
psRangeEnc.enc_icdf(ix[n][1], Tables.silk_uniform5_iCDF, 8);
}
}
internal static void encode_split(
EntropyCoder psRangeEnc, /* I/O compressor data structure */
int p_child1, /* I pulse amplitude of first child subframe */
int p, /* I pulse amplitude of current subframe */
byte[] shell_table /* I table of shell cdfs */
)
{
if (p > 0)
{
psRangeEnc.enc_icdf(p_child1, shell_table, Tables.silk_shell_code_table_offsets[p], 8);
}
}
/// <summary>
/// Encodes signs of excitation
/// </summary>
/// <param name="psRangeEnc">I/O Compressor data structure</param>
/// <param name="pulses">I pulse signal</param>
/// <param name="length">I length of input</param>
/// <param name="signalType">I Signal type</param>
/// <param name="quantOffsetType">I Quantization offset type</param>
/// <param name="sum_pulses">I Sum of absolute pulses per block [MAX_NB_SHELL_BLOCKS]</param>
internal static void silk_encode_signs(
EntropyCoder psRangeEnc,
sbyte[] pulses,
int length,
int signalType,
int quantOffsetType,
int[] sum_pulses)
{
int i, j, p;
byte[] icdf = new byte[2];
int q_ptr;
byte[] sign_icdf = Tables.silk_sign_iCDF;
int icdf_ptr;
icdf[1] = 0;
q_ptr = 0;
i = Inlines.silk_SMULBB(7, Inlines.silk_ADD_LSHIFT(quantOffsetType, signalType, 1));
icdf_ptr = i;
length = Inlines.silk_RSHIFT(length + (SilkConstants.SHELL_CODEC_FRAME_LENGTH / 2), SilkConstants.LOG2_SHELL_CODEC_FRAME_LENGTH);
for (i = 0; i < length; i++)
{
p = sum_pulses[i];
if (p > 0)
{
icdf[0] = sign_icdf[icdf_ptr + Inlines.silk_min(p & 0x1F, 6)];
for (j = q_ptr; j < q_ptr + SilkConstants.SHELL_CODEC_FRAME_LENGTH; j++)
{
if (pulses[j] != 0)
{
psRangeEnc.enc_icdf(silk_enc_map(pulses[j]), icdf, 8);
}
}
}
q_ptr += SilkConstants.SHELL_CODEC_FRAME_LENGTH;
}
}
/// <summary>
/// Encode frame with Silk
/// Note: if prefillFlag is set, the input must contain 10 ms of audio, irrespective of what
/// encControl.payloadSize_ms is set to
/// </summary>
/// <param name="psEnc">I/O State</param>
/// <param name="encControl">I Control status</param>
/// <param name="samplesIn">I Speech sample input vector</param>
/// <param name="nSamplesIn">I Number of samples in input vector</param>
/// <param name="psRangeEnc">I/O Compressor data structure</param>
/// <param name="nBytesOut">I/O Number of bytes in payload (input: Max bytes)</param>
/// <param name="prefillFlag">I Flag to indicate prefilling buffers no coding</param>
/// <returns>error code</returns>
internal static int silk_Encode(
SilkEncoder psEnc,
EncControlState encControl,
short[] samplesIn,
int nSamplesIn,
EntropyCoder psRangeEnc,
BoxedValueInt nBytesOut,
int prefillFlag)
{
int ret = SilkError.SILK_NO_ERROR;
int n, i, nBits, flags, tmp_payloadSize_ms = 0, tmp_complexity = 0;
int nSamplesToBuffer, nSamplesToBufferMax, nBlocksOf10ms;
int nSamplesFromInput = 0, nSamplesFromInputMax;
int speech_act_thr_for_switch_Q8;
int TargetRate_bps, channelRate_bps, LBRR_symbol, sum;
int[] MStargetRates_bps = new int[2];
short[] buf;
int transition, curr_block, tot_blocks;
nBytesOut.Val = 0;
if (encControl.reducedDependency != 0)
{
psEnc.state_Fxx[0].first_frame_after_reset = 1;
psEnc.state_Fxx[1].first_frame_after_reset = 1;
}
psEnc.state_Fxx[0].nFramesEncoded = psEnc.state_Fxx[1].nFramesEncoded = 0;
/* Check values in encoder control structure */
ret += encControl.check_control_input();
if (ret != SilkError.SILK_NO_ERROR)
{
Inlines.OpusAssert(false);
return(ret);
}
encControl.switchReady = 0;
if (encControl.nChannelsInternal > psEnc.nChannelsInternal)
{
/* Mono . Stereo transition: init state of second channel and stereo state */
ret += SilkEncoder.silk_init_encoder(psEnc.state_Fxx[1]);
Arrays.MemSetShort(psEnc.sStereo.pred_prev_Q13, 0, 2);
Arrays.MemSetShort(psEnc.sStereo.sSide, 0, 2);
psEnc.sStereo.mid_side_amp_Q0[0] = 0;
psEnc.sStereo.mid_side_amp_Q0[1] = 1;
psEnc.sStereo.mid_side_amp_Q0[2] = 0;
psEnc.sStereo.mid_side_amp_Q0[3] = 1;
psEnc.sStereo.width_prev_Q14 = 0;
psEnc.sStereo.smth_width_Q14 = (short)(((int)((1.0f) * ((long)1 << (14)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 14)*/);
if (psEnc.nChannelsAPI == 2)
{
psEnc.state_Fxx[1].resampler_state.Assign(psEnc.state_Fxx[0].resampler_state);
Array.Copy(psEnc.state_Fxx[0].In_HP_State, psEnc.state_Fxx[1].In_HP_State, 2);
}
}
transition = ((encControl.payloadSize_ms != psEnc.state_Fxx[0].PacketSize_ms) || (psEnc.nChannelsInternal != encControl.nChannelsInternal)) ? 1 : 0;
psEnc.nChannelsAPI = encControl.nChannelsAPI;
psEnc.nChannelsInternal = encControl.nChannelsInternal;
nBlocksOf10ms = Inlines.silk_DIV32(100 * nSamplesIn, encControl.API_sampleRate);
tot_blocks = (nBlocksOf10ms > 1) ? nBlocksOf10ms >> 1 : 1;
curr_block = 0;
if (prefillFlag != 0)
{
/* Only accept input length of 10 ms */
if (nBlocksOf10ms != 1)
{
Inlines.OpusAssert(false);
return(SilkError.SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES);
}
/* Reset Encoder */
for (n = 0; n < encControl.nChannelsInternal; n++)
{
ret += SilkEncoder.silk_init_encoder(psEnc.state_Fxx[n]);
Inlines.OpusAssert(ret == SilkError.SILK_NO_ERROR);
}
tmp_payloadSize_ms = encControl.payloadSize_ms;
encControl.payloadSize_ms = 10;
tmp_complexity = encControl.complexity;
encControl.complexity = 0;
for (n = 0; n < encControl.nChannelsInternal; n++)
{
psEnc.state_Fxx[n].controlled_since_last_payload = 0;
psEnc.state_Fxx[n].prefillFlag = 1;
}
}
else
{
/* Only accept input lengths that are a multiple of 10 ms */
if (nBlocksOf10ms * encControl.API_sampleRate != 100 * nSamplesIn || nSamplesIn < 0)
{
Inlines.OpusAssert(false);
return(SilkError.SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES);
}
/* Make sure no more than one packet can be produced */
if (1000 * (int)nSamplesIn > encControl.payloadSize_ms * encControl.API_sampleRate)
{
Inlines.OpusAssert(false);
return(SilkError.SILK_ENC_INPUT_INVALID_NO_OF_SAMPLES);
}
}
TargetRate_bps = Inlines.silk_RSHIFT32(encControl.bitRate, encControl.nChannelsInternal - 1);
for (n = 0; n < encControl.nChannelsInternal; n++)
{
/* Force the side channel to the same rate as the mid */
int force_fs_kHz = (n == 1) ? psEnc.state_Fxx[0].fs_kHz : 0;
ret += psEnc.state_Fxx[n].silk_control_encoder(encControl, TargetRate_bps, psEnc.allowBandwidthSwitch, n, force_fs_kHz);
if (ret != SilkError.SILK_NO_ERROR)
{
Inlines.OpusAssert(false);
return(ret);
}
if (psEnc.state_Fxx[n].first_frame_after_reset != 0 || transition != 0)
{
for (i = 0; i < psEnc.state_Fxx[0].nFramesPerPacket; i++)
{
psEnc.state_Fxx[n].LBRR_flags[i] = 0;
}
}
psEnc.state_Fxx[n].inDTX = psEnc.state_Fxx[n].useDTX;
}
Inlines.OpusAssert(encControl.nChannelsInternal == 1 || psEnc.state_Fxx[0].fs_kHz == psEnc.state_Fxx[1].fs_kHz);
/* Input buffering/resampling and encoding */
nSamplesToBufferMax = 10 * nBlocksOf10ms * psEnc.state_Fxx[0].fs_kHz;
nSamplesFromInputMax =
Inlines.silk_DIV32_16(nSamplesToBufferMax *
psEnc.state_Fxx[0].API_fs_Hz,
(short)(psEnc.state_Fxx[0].fs_kHz * 1000));
buf = new short[nSamplesFromInputMax];
int samplesIn_ptr = 0;
while (true)
{
nSamplesToBuffer = psEnc.state_Fxx[0].frame_length - psEnc.state_Fxx[0].inputBufIx;
nSamplesToBuffer = Inlines.silk_min(nSamplesToBuffer, nSamplesToBufferMax);
nSamplesFromInput = Inlines.silk_DIV32_16(nSamplesToBuffer * psEnc.state_Fxx[0].API_fs_Hz, psEnc.state_Fxx[0].fs_kHz * 1000);
/* Resample and write to buffer */
if (encControl.nChannelsAPI == 2 && encControl.nChannelsInternal == 2)
{
int id = psEnc.state_Fxx[0].nFramesEncoded;
for (n = 0; n < nSamplesFromInput; n++)
{
buf[n] = samplesIn[samplesIn_ptr + (2 * n)];
}
/* Making sure to start both resamplers from the same state when switching from mono to stereo */
if (psEnc.nPrevChannelsInternal == 1 && id == 0)
{
//silk_memcpy(&psEnc.state_Fxx[1].resampler_state, &psEnc.state_Fxx[0].resampler_state, sizeof(psEnc.state_Fxx[1].resampler_state));
psEnc.state_Fxx[1].resampler_state.Assign(psEnc.state_Fxx[0].resampler_state);
}
ret += Resampler.silk_resampler(
psEnc.state_Fxx[0].resampler_state,
psEnc.state_Fxx[0].inputBuf,
psEnc.state_Fxx[0].inputBufIx + 2,
buf,
0,
nSamplesFromInput);
psEnc.state_Fxx[0].inputBufIx += nSamplesToBuffer;
nSamplesToBuffer = psEnc.state_Fxx[1].frame_length - psEnc.state_Fxx[1].inputBufIx;
nSamplesToBuffer = Inlines.silk_min(nSamplesToBuffer, 10 * nBlocksOf10ms * psEnc.state_Fxx[1].fs_kHz);
for (n = 0; n < nSamplesFromInput; n++)
{
buf[n] = samplesIn[samplesIn_ptr + (2 * n) + 1];
}
ret += Resampler.silk_resampler(
psEnc.state_Fxx[1].resampler_state,
psEnc.state_Fxx[1].inputBuf,
psEnc.state_Fxx[1].inputBufIx + 2,
buf,
0,
nSamplesFromInput);
psEnc.state_Fxx[1].inputBufIx += nSamplesToBuffer;
}
else if (encControl.nChannelsAPI == 2 && encControl.nChannelsInternal == 1)
{
/* Combine left and right channels before resampling */
for (n = 0; n < nSamplesFromInput; n++)
{
sum = samplesIn[samplesIn_ptr + (2 * n)] + samplesIn[samplesIn_ptr + (2 * n) + 1];
buf[n] = (short)Inlines.silk_RSHIFT_ROUND(sum, 1);
}
ret += Resampler.silk_resampler(
psEnc.state_Fxx[0].resampler_state,
psEnc.state_Fxx[0].inputBuf,
psEnc.state_Fxx[0].inputBufIx + 2,
buf,
0,
nSamplesFromInput);
/* On the first mono frame, average the results for the two resampler states */
if (psEnc.nPrevChannelsInternal == 2 && psEnc.state_Fxx[0].nFramesEncoded == 0)
{
ret += Resampler.silk_resampler(
psEnc.state_Fxx[1].resampler_state,
psEnc.state_Fxx[1].inputBuf,
psEnc.state_Fxx[1].inputBufIx + 2,
buf,
0,
nSamplesFromInput);
for (n = 0; n < psEnc.state_Fxx[0].frame_length; n++)
{
psEnc.state_Fxx[0].inputBuf[psEnc.state_Fxx[0].inputBufIx + n + 2] =
(short)(Inlines.silk_RSHIFT(psEnc.state_Fxx[0].inputBuf[psEnc.state_Fxx[0].inputBufIx + n + 2]
+ psEnc.state_Fxx[1].inputBuf[psEnc.state_Fxx[1].inputBufIx + n + 2], 1));
}
}
psEnc.state_Fxx[0].inputBufIx += nSamplesToBuffer;
}
else
{
Inlines.OpusAssert(encControl.nChannelsAPI == 1 && encControl.nChannelsInternal == 1);
Array.Copy(samplesIn, samplesIn_ptr, buf, 0, nSamplesFromInput);
ret += Resampler.silk_resampler(
psEnc.state_Fxx[0].resampler_state,
psEnc.state_Fxx[0].inputBuf,
psEnc.state_Fxx[0].inputBufIx + 2,
buf,
0,
nSamplesFromInput);
psEnc.state_Fxx[0].inputBufIx += nSamplesToBuffer;
}
samplesIn_ptr += (nSamplesFromInput * encControl.nChannelsAPI);
nSamplesIn -= nSamplesFromInput;
/* Default */
psEnc.allowBandwidthSwitch = 0;
/* Silk encoder */
if (psEnc.state_Fxx[0].inputBufIx >= psEnc.state_Fxx[0].frame_length)
{
/* Enough data in input buffer, so encode */
Inlines.OpusAssert(psEnc.state_Fxx[0].inputBufIx == psEnc.state_Fxx[0].frame_length);
Inlines.OpusAssert(encControl.nChannelsInternal == 1 || psEnc.state_Fxx[1].inputBufIx == psEnc.state_Fxx[1].frame_length);
/* Deal with LBRR data */
if (psEnc.state_Fxx[0].nFramesEncoded == 0 && prefillFlag == 0)
{
/* Create space at start of payload for VAD and FEC flags */
byte[] iCDF = { 0, 0 };
iCDF[0] = (byte)(256 - Inlines.silk_RSHIFT(256, (psEnc.state_Fxx[0].nFramesPerPacket + 1) * encControl.nChannelsInternal));
psRangeEnc.enc_icdf(0, iCDF, 8);
/* Encode any LBRR data from previous packet */
/* Encode LBRR flags */
for (n = 0; n < encControl.nChannelsInternal; n++)
{
LBRR_symbol = 0;
for (i = 0; i < psEnc.state_Fxx[n].nFramesPerPacket; i++)
{
LBRR_symbol |= Inlines.silk_LSHIFT(psEnc.state_Fxx[n].LBRR_flags[i], i);
}
psEnc.state_Fxx[n].LBRR_flag = (sbyte)(LBRR_symbol > 0 ? 1 : 0);
if (LBRR_symbol != 0 && psEnc.state_Fxx[n].nFramesPerPacket > 1)
{
psRangeEnc.enc_icdf(LBRR_symbol - 1, Tables.silk_LBRR_flags_iCDF_ptr[psEnc.state_Fxx[n].nFramesPerPacket - 2], 8);
}
}
/* Code LBRR indices and excitation signals */
for (i = 0; i < psEnc.state_Fxx[0].nFramesPerPacket; i++)
{
for (n = 0; n < encControl.nChannelsInternal; n++)
{
if (psEnc.state_Fxx[n].LBRR_flags[i] != 0)
{
int condCoding;
if (encControl.nChannelsInternal == 2 && n == 0)
{
Stereo.silk_stereo_encode_pred(psRangeEnc, psEnc.sStereo.predIx[i]);
/* For LBRR data there's no need to code the mid-only flag if the side-channel LBRR flag is set */
if (psEnc.state_Fxx[1].LBRR_flags[i] == 0)
{
Stereo.silk_stereo_encode_mid_only(psRangeEnc, psEnc.sStereo.mid_only_flags[i]);
}
}
/* Use conditional coding if previous frame available */
if (i > 0 && psEnc.state_Fxx[n].LBRR_flags[i - 1] != 0)
{
condCoding = SilkConstants.CODE_CONDITIONALLY;
}
else
{
condCoding = SilkConstants.CODE_INDEPENDENTLY;
}
EncodeIndices.silk_encode_indices(psEnc.state_Fxx[n], psRangeEnc, i, 1, condCoding);
EncodePulses.silk_encode_pulses(psRangeEnc, psEnc.state_Fxx[n].indices_LBRR[i].signalType, psEnc.state_Fxx[n].indices_LBRR[i].quantOffsetType,
psEnc.state_Fxx[n].pulses_LBRR[i], psEnc.state_Fxx[n].frame_length);
}
}
}
/* Reset LBRR flags */
for (n = 0; n < encControl.nChannelsInternal; n++)
{
Arrays.MemSetInt(psEnc.state_Fxx[n].LBRR_flags, 0, SilkConstants.MAX_FRAMES_PER_PACKET);
}
psEnc.nBitsUsedLBRR = psRangeEnc.tell();
}
HPVariableCutoff.silk_HP_variable_cutoff(psEnc.state_Fxx);
/* Total target bits for packet */
nBits = Inlines.silk_DIV32_16(Inlines.silk_MUL(encControl.bitRate, encControl.payloadSize_ms), 1000);
/* Subtract bits used for LBRR */
if (prefillFlag == 0)
{
nBits -= psEnc.nBitsUsedLBRR;
}
/* Divide by number of uncoded frames left in packet */
nBits = Inlines.silk_DIV32_16(nBits, psEnc.state_Fxx[0].nFramesPerPacket);
/* Convert to bits/second */
if (encControl.payloadSize_ms == 10)
{
TargetRate_bps = Inlines.silk_SMULBB(nBits, 100);
}
else
{
TargetRate_bps = Inlines.silk_SMULBB(nBits, 50);
}
/* Subtract fraction of bits in excess of target in previous frames and packets */
TargetRate_bps -= Inlines.silk_DIV32_16(Inlines.silk_MUL(psEnc.nBitsExceeded, 1000), TuningParameters.BITRESERVOIR_DECAY_TIME_MS);
if (prefillFlag == 0 && psEnc.state_Fxx[0].nFramesEncoded > 0)
{
/* Compare actual vs target bits so far in this packet */
int bitsBalance = psRangeEnc.tell() - psEnc.nBitsUsedLBRR - nBits * psEnc.state_Fxx[0].nFramesEncoded;
TargetRate_bps -= Inlines.silk_DIV32_16(Inlines.silk_MUL(bitsBalance, 1000), TuningParameters.BITRESERVOIR_DECAY_TIME_MS);
}
/* Never exceed input bitrate */
TargetRate_bps = Inlines.silk_LIMIT(TargetRate_bps, encControl.bitRate, 5000);
/* Convert Left/Right to Mid/Side */
if (encControl.nChannelsInternal == 2)
{
BoxedValueSbyte midOnlyFlagBoxed = new BoxedValueSbyte(psEnc.sStereo.mid_only_flags[psEnc.state_Fxx[0].nFramesEncoded]);
Stereo.silk_stereo_LR_to_MS(psEnc.sStereo,
psEnc.state_Fxx[0].inputBuf,
2,
psEnc.state_Fxx[1].inputBuf,
2,
psEnc.sStereo.predIx[psEnc.state_Fxx[0].nFramesEncoded],
midOnlyFlagBoxed,
MStargetRates_bps,
TargetRate_bps,
psEnc.state_Fxx[0].speech_activity_Q8,
encControl.toMono,
psEnc.state_Fxx[0].fs_kHz,
psEnc.state_Fxx[0].frame_length);
psEnc.sStereo.mid_only_flags[psEnc.state_Fxx[0].nFramesEncoded] = midOnlyFlagBoxed.Val;
if (midOnlyFlagBoxed.Val == 0)
{
/* Reset side channel encoder memory for first frame with side coding */
if (psEnc.prev_decode_only_middle == 1)
{
psEnc.state_Fxx[1].sShape.Reset();
psEnc.state_Fxx[1].sPrefilt.Reset();
psEnc.state_Fxx[1].sNSQ.Reset();
Arrays.MemSetShort(psEnc.state_Fxx[1].prev_NLSFq_Q15, 0, SilkConstants.MAX_LPC_ORDER);
Arrays.MemSetInt(psEnc.state_Fxx[1].sLP.In_LP_State, 0, 2);
psEnc.state_Fxx[1].prevLag = 100;
psEnc.state_Fxx[1].sNSQ.lagPrev = 100;
psEnc.state_Fxx[1].sShape.LastGainIndex = 10;
psEnc.state_Fxx[1].prevSignalType = SilkConstants.TYPE_NO_VOICE_ACTIVITY;
psEnc.state_Fxx[1].sNSQ.prev_gain_Q16 = 65536;
psEnc.state_Fxx[1].first_frame_after_reset = 1;
}
psEnc.state_Fxx[1].silk_encode_do_VAD();
}
else
{
psEnc.state_Fxx[1].VAD_flags[psEnc.state_Fxx[0].nFramesEncoded] = 0;
}
if (prefillFlag == 0)
{
Stereo.silk_stereo_encode_pred(psRangeEnc, psEnc.sStereo.predIx[psEnc.state_Fxx[0].nFramesEncoded]);
if (psEnc.state_Fxx[1].VAD_flags[psEnc.state_Fxx[0].nFramesEncoded] == 0)
{
Stereo.silk_stereo_encode_mid_only(psRangeEnc, psEnc.sStereo.mid_only_flags[psEnc.state_Fxx[0].nFramesEncoded]);
}
}
}
else
{
/* Buffering */
Array.Copy(psEnc.sStereo.sMid, psEnc.state_Fxx[0].inputBuf, 2);
Array.Copy(psEnc.state_Fxx[0].inputBuf, psEnc.state_Fxx[0].frame_length, psEnc.sStereo.sMid, 0, 2);
}
psEnc.state_Fxx[0].silk_encode_do_VAD();
/* Encode */
for (n = 0; n < encControl.nChannelsInternal; n++)
{
int maxBits, useCBR;
/* Handling rate constraints */
maxBits = encControl.maxBits;
if (tot_blocks == 2 && curr_block == 0)
{
maxBits = maxBits * 3 / 5;
}
else if (tot_blocks == 3)
{
if (curr_block == 0)
{
maxBits = maxBits * 2 / 5;
}
else if (curr_block == 1)
{
maxBits = maxBits * 3 / 4;
}
}
useCBR = (encControl.useCBR != 0 && curr_block == tot_blocks - 1) ? 1 : 0;
if (encControl.nChannelsInternal == 1)
{
channelRate_bps = TargetRate_bps;
}
else
{
channelRate_bps = MStargetRates_bps[n];
if (n == 0 && MStargetRates_bps[1] > 0)
{
useCBR = 0;
/* Give mid up to 1/2 of the max bits for that frame */
maxBits -= encControl.maxBits / (tot_blocks * 2);
}
}
if (channelRate_bps > 0)
{
int condCoding;
psEnc.state_Fxx[n].silk_control_SNR(channelRate_bps);
/* Use independent coding if no previous frame available */
if (psEnc.state_Fxx[0].nFramesEncoded - n <= 0)
{
condCoding = SilkConstants.CODE_INDEPENDENTLY;
}
else if (n > 0 && psEnc.prev_decode_only_middle != 0)
{
/* If we skipped a side frame in this packet, we don't
* need LTP scaling; the LTP state is well-defined. */
condCoding = SilkConstants.CODE_INDEPENDENTLY_NO_LTP_SCALING;
}
else
{
condCoding = SilkConstants.CODE_CONDITIONALLY;
}
ret += psEnc.state_Fxx[n].silk_encode_frame(nBytesOut, psRangeEnc, condCoding, maxBits, useCBR);
Inlines.OpusAssert(ret == SilkError.SILK_NO_ERROR);
}
psEnc.state_Fxx[n].controlled_since_last_payload = 0;
psEnc.state_Fxx[n].inputBufIx = 0;
psEnc.state_Fxx[n].nFramesEncoded++;
}
psEnc.prev_decode_only_middle = psEnc.sStereo.mid_only_flags[psEnc.state_Fxx[0].nFramesEncoded - 1];
/* Insert VAD and FEC flags at beginning of bitstream */
if (nBytesOut.Val > 0 && psEnc.state_Fxx[0].nFramesEncoded == psEnc.state_Fxx[0].nFramesPerPacket)
{
flags = 0;
for (n = 0; n < encControl.nChannelsInternal; n++)
{
for (i = 0; i < psEnc.state_Fxx[n].nFramesPerPacket; i++)
{
flags = Inlines.silk_LSHIFT(flags, 1);
flags |= (int)psEnc.state_Fxx[n].VAD_flags[i];
}
flags = Inlines.silk_LSHIFT(flags, 1);
flags |= (int)psEnc.state_Fxx[n].LBRR_flag;
}
if (prefillFlag == 0)
{
psRangeEnc.enc_patch_initial_bits((uint)flags, (uint)((psEnc.state_Fxx[0].nFramesPerPacket + 1) * encControl.nChannelsInternal));
}
/* Return zero bytes if all channels DTXed */
if (psEnc.state_Fxx[0].inDTX != 0 && (encControl.nChannelsInternal == 1 || psEnc.state_Fxx[1].inDTX != 0))
{
nBytesOut.Val = 0;
}
psEnc.nBitsExceeded += nBytesOut.Val * 8;
psEnc.nBitsExceeded -= Inlines.silk_DIV32_16(Inlines.silk_MUL(encControl.bitRate, encControl.payloadSize_ms), 1000);
psEnc.nBitsExceeded = Inlines.silk_LIMIT(psEnc.nBitsExceeded, 0, 10000);
/* Update flag indicating if bandwidth switching is allowed */
speech_act_thr_for_switch_Q8 = Inlines.silk_SMLAWB(((int)((TuningParameters.SPEECH_ACTIVITY_DTX_THRES) * ((long)1 << (8)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.SPEECH_ACTIVITY_DTX_THRES, 8)*/,
((int)(((1 - TuningParameters.SPEECH_ACTIVITY_DTX_THRES) / TuningParameters.MAX_BANDWIDTH_SWITCH_DELAY_MS) * ((long)1 << (16 + 8)) + 0.5)) /*Inlines.SILK_CONST((1 - TuningParameters.SPEECH_ACTIVITY_DTX_THRES) / TuningParameters.MAX_BANDWIDTH_SWITCH_DELAY_MS, 16 + 8)*/,
psEnc.timeSinceSwitchAllowed_ms);
if (psEnc.state_Fxx[0].speech_activity_Q8 < speech_act_thr_for_switch_Q8)
{
psEnc.allowBandwidthSwitch = 1;
psEnc.timeSinceSwitchAllowed_ms = 0;
}
else
{
psEnc.allowBandwidthSwitch = 0;
psEnc.timeSinceSwitchAllowed_ms += encControl.payloadSize_ms;
}
}
if (nSamplesIn == 0)
{
break;
}
}
else
{
break;
}
curr_block++;
}
psEnc.nPrevChannelsInternal = encControl.nChannelsInternal;
encControl.allowBandwidthSwitch = psEnc.allowBandwidthSwitch;
encControl.inWBmodeWithoutVariableLP = (psEnc.state_Fxx[0].fs_kHz == 16 && psEnc.state_Fxx[0].sLP.mode == 0) ? 1 : 0;
encControl.internalSampleRate = Inlines.silk_SMULBB(psEnc.state_Fxx[0].fs_kHz, 1000);
encControl.stereoWidth_Q14 = encControl.toMono != 0 ? 0 : psEnc.sStereo.smth_width_Q14;
if (prefillFlag != 0)
{
encControl.payloadSize_ms = tmp_payloadSize_ms;
encControl.complexity = tmp_complexity;
for (n = 0; n < encControl.nChannelsInternal; n++)
{
psEnc.state_Fxx[n].controlled_since_last_payload = 0;
psEnc.state_Fxx[n].prefillFlag = 0;
}
}
return(ret);
}
internal static int quant_coarse_energy_impl(CeltMode m, int start, int end,
int[][] eBands, int[][] oldEBands,
int budget, int tell,
byte[] prob_model, int[][] error, EntropyCoder enc,
int C, int LM, int intra, int max_decay, int lfe)
{
int i, c;
int badness = 0;
int[] prev = { 0, 0 };
int coef;
int beta;
if (tell + 3 <= budget)
{
enc.enc_bit_logp(intra, 3);
}
if (intra != 0)
{
coef = 0;
beta = beta_intra;
}
else
{
beta = beta_coef[LM];
coef = pred_coef[LM];
}
/* Encode at a fixed coarse resolution */
for (i = start; i < end; i++)
{
c = 0;
do
{
int bits_left;
int qi, qi0;
int q;
int x;
int f, tmp;
int oldE;
int decay_bound;
x = eBands[c][i];
oldE = Inlines.MAX16(-((short)(0.5 + (9.0f) * (((int)1) << (CeltConstants.DB_SHIFT)))) /*Inlines.QCONST16(9.0f, CeltConstants.DB_SHIFT)*/, oldEBands[c][i]);
f = Inlines.SHL32(Inlines.EXTEND32(x), 7) - Inlines.PSHR32(Inlines.MULT16_16(coef, oldE), 8) - prev[c];
/* Rounding to nearest integer here is really important! */
qi = (f + ((int)(0.5 + (.5f) * (((int)1) << (CeltConstants.DB_SHIFT + 7)))) /*Inlines.QCONST32(.5f, CeltConstants.DB_SHIFT + 7)*/) >> (CeltConstants.DB_SHIFT + 7);
decay_bound = Inlines.EXTRACT16(Inlines.MAX32(-((short)(0.5 + (28.0f) * (((int)1) << (CeltConstants.DB_SHIFT)))) /*Inlines.QCONST16(28.0f, CeltConstants.DB_SHIFT)*/,
Inlines.SUB32((int)oldEBands[c][i], max_decay)));
/* Prevent the energy from going down too quickly (e.g. for bands
* that have just one bin) */
if (qi < 0 && x < decay_bound)
{
qi += (int)Inlines.SHR16(Inlines.SUB16(decay_bound, x), CeltConstants.DB_SHIFT);
if (qi > 0)
{
qi = 0;
}
}
qi0 = qi;
/* If we don't have enough bits to encode all the energy, just assume
* something safe. */
tell = enc.tell();
bits_left = budget - tell - 3 * C * (end - i);
if (i != start && bits_left < 30)
{
if (bits_left < 24)
{
qi = Inlines.IMIN(1, qi);
}
if (bits_left < 16)
{
qi = Inlines.IMAX(-1, qi);
}
}
if (lfe != 0 && i >= 2)
{
qi = Inlines.IMIN(qi, 0);
}
if (budget - tell >= 15)
{
int pi;
pi = 2 * Inlines.IMIN(i, 20);
Laplace.ec_laplace_encode(enc, ref qi, (((uint)prob_model[pi]) << 7), ((int)prob_model[pi + 1]) << 6);
}
else if (budget - tell >= 2)
{
qi = Inlines.IMAX(-1, Inlines.IMIN(qi, 1));
enc.enc_icdf(2 * qi ^ (0 - (qi < 0 ? 1 : 0)), small_energy_icdf, 2);
}
else if (budget - tell >= 1)
{
qi = Inlines.IMIN(0, qi);
enc.enc_bit_logp(-qi, 1);
}
else
{
qi = -1;
}
error[c][i] = (Inlines.PSHR32(f, 7) - Inlines.SHL16((qi), CeltConstants.DB_SHIFT));
badness += Inlines.abs(qi0 - qi);
q = (int)Inlines.SHL32(qi, CeltConstants.DB_SHIFT); // opus bug: useless extend32
tmp = Inlines.PSHR32(Inlines.MULT16_16(coef, oldE), 8) + prev[c] + Inlines.SHL32(q, 7);
tmp = Inlines.MAX32(-((int)(0.5 + (28.0f) * (((int)1) << (CeltConstants.DB_SHIFT + 7)))) /*Inlines.QCONST32(28.0f, CeltConstants.DB_SHIFT + 7)*/, tmp);
oldEBands[c][i] = (Inlines.PSHR32(tmp, 7));
prev[c] = prev[c] + Inlines.SHL32(q, 7) - Inlines.MULT16_16(beta, Inlines.PSHR32(q, 8));
} while (++c < C);
}
return(lfe != 0 ? 0 : badness);
}
/// <summary>
/// Entropy code the mid-only flag
/// </summary>
/// <param name="psRangeEnc">I/O Compressor data structure</param>
/// <param name="mid_only_flag"></param>
internal static void silk_stereo_encode_mid_only(EntropyCoder psRangeEnc, sbyte mid_only_flag)
{
/* Encode flag that only mid channel is coded */
psRangeEnc.enc_icdf(mid_only_flag, Tables.silk_stereo_only_code_mid_iCDF, 8);
}
/// <summary>
/// Encode quantization indices of excitation
/// </summary>
/// <param name="psRangeEnc">I/O compressor data structure</param>
/// <param name="signalType">I Signal type</param>
/// <param name="quantOffsetType">I quantOffsetType</param>
/// <param name="pulses">I quantization indices</param>
/// <param name="frame_length">I Frame length</param>
internal static void silk_encode_pulses(
EntropyCoder psRangeEnc,
int signalType,
int quantOffsetType,
sbyte[] pulses,
int frame_length)
{
int i, k, j, iter, bit, nLS, scale_down, RateLevelIndex = 0;
int abs_q, minSumBits_Q5, sumBits_Q5;
int[] abs_pulses;
int[] sum_pulses;
int[] nRshifts;
int[] pulses_comb = new int[8];
int abs_pulses_ptr;
int pulses_ptr;
byte[] nBits_ptr;
Arrays.MemSetInt(pulses_comb, 0, 8);
/****************************/
/* Prepare for shell coding */
/****************************/
/* Calculate number of shell blocks */
Inlines.OpusAssert(1 << SilkConstants.LOG2_SHELL_CODEC_FRAME_LENGTH == SilkConstants.SHELL_CODEC_FRAME_LENGTH);
iter = Inlines.silk_RSHIFT(frame_length, SilkConstants.LOG2_SHELL_CODEC_FRAME_LENGTH);
if (iter * SilkConstants.SHELL_CODEC_FRAME_LENGTH < frame_length)
{
Inlines.OpusAssert(frame_length == 12 * 10); /* Make sure only happens for 10 ms @ 12 kHz */
iter++;
Arrays.MemSetWithOffset <sbyte>(pulses, 0, frame_length, SilkConstants.SHELL_CODEC_FRAME_LENGTH);
}
/* Take the absolute value of the pulses */
abs_pulses = new int[iter * SilkConstants.SHELL_CODEC_FRAME_LENGTH];
Inlines.OpusAssert((SilkConstants.SHELL_CODEC_FRAME_LENGTH & 3) == 0);
// unrolled loop
for (i = 0; i < iter * SilkConstants.SHELL_CODEC_FRAME_LENGTH; i += 4)
{
abs_pulses[i + 0] = (int)Inlines.silk_abs(pulses[i + 0]);
abs_pulses[i + 1] = (int)Inlines.silk_abs(pulses[i + 1]);
abs_pulses[i + 2] = (int)Inlines.silk_abs(pulses[i + 2]);
abs_pulses[i + 3] = (int)Inlines.silk_abs(pulses[i + 3]);
}
/* Calc sum pulses per shell code frame */
sum_pulses = new int[iter];
nRshifts = new int[iter];
abs_pulses_ptr = 0;
for (i = 0; i < iter; i++)
{
nRshifts[i] = 0;
while (true)
{
/* 1+1 . 2 */
scale_down = combine_and_check(pulses_comb, 0, abs_pulses, abs_pulses_ptr, Tables.silk_max_pulses_table[0], 8);
/* 2+2 . 4 */
scale_down += combine_and_check(pulses_comb, pulses_comb, Tables.silk_max_pulses_table[1], 4);
/* 4+4 . 8 */
scale_down += combine_and_check(pulses_comb, pulses_comb, Tables.silk_max_pulses_table[2], 2);
/* 8+8 . 16 */
scale_down += combine_and_check(sum_pulses, i, pulses_comb, 0, Tables.silk_max_pulses_table[3], 1);
if (scale_down != 0)
{
/* We need to downscale the quantization signal */
nRshifts[i]++;
for (k = abs_pulses_ptr; k < abs_pulses_ptr + SilkConstants.SHELL_CODEC_FRAME_LENGTH; k++)
{
abs_pulses[k] = Inlines.silk_RSHIFT(abs_pulses[k], 1);
}
}
else
{
/* Jump out of while(1) loop and go to next shell coding frame */
break;
}
}
abs_pulses_ptr += SilkConstants.SHELL_CODEC_FRAME_LENGTH;
}
/**************/
/* Rate level */
/**************/
/* find rate level that leads to fewest bits for coding of pulses per block info */
minSumBits_Q5 = int.MaxValue;
for (k = 0; k < SilkConstants.N_RATE_LEVELS - 1; k++)
{
nBits_ptr = Tables.silk_pulses_per_block_BITS_Q5[k];
sumBits_Q5 = Tables.silk_rate_levels_BITS_Q5[signalType >> 1][k];
for (i = 0; i < iter; i++)
{
if (nRshifts[i] > 0)
{
sumBits_Q5 += nBits_ptr[SilkConstants.SILK_MAX_PULSES + 1];
}
else
{
sumBits_Q5 += nBits_ptr[sum_pulses[i]];
}
}
if (sumBits_Q5 < minSumBits_Q5)
{
minSumBits_Q5 = sumBits_Q5;
RateLevelIndex = k;
}
}
psRangeEnc.enc_icdf(RateLevelIndex, Tables.silk_rate_levels_iCDF[signalType >> 1], 8);
/***************************************************/
/* Sum-Weighted-Pulses Encoding */
/***************************************************/
for (i = 0; i < iter; i++)
{
if (nRshifts[i] == 0)
{
psRangeEnc.enc_icdf(sum_pulses[i], Tables.silk_pulses_per_block_iCDF[RateLevelIndex], 8);
}
else
{
psRangeEnc.enc_icdf(SilkConstants.SILK_MAX_PULSES + 1, Tables.silk_pulses_per_block_iCDF[RateLevelIndex], 8);
for (k = 0; k < nRshifts[i] - 1; k++)
{
psRangeEnc.enc_icdf(SilkConstants.SILK_MAX_PULSES + 1, Tables.silk_pulses_per_block_iCDF[SilkConstants.N_RATE_LEVELS - 1], 8);
}
psRangeEnc.enc_icdf(sum_pulses[i], Tables.silk_pulses_per_block_iCDF[SilkConstants.N_RATE_LEVELS - 1], 8);
}
}
/******************/
/* Shell Encoding */
/******************/
for (i = 0; i < iter; i++)
{
if (sum_pulses[i] > 0)
{
ShellCoder.silk_shell_encoder(psRangeEnc, abs_pulses, i * SilkConstants.SHELL_CODEC_FRAME_LENGTH);
}
}
/****************/
/* LSB Encoding */
/****************/
for (i = 0; i < iter; i++)
{
if (nRshifts[i] > 0)
{
pulses_ptr = i * SilkConstants.SHELL_CODEC_FRAME_LENGTH;
nLS = nRshifts[i] - 1;
for (k = 0; k < SilkConstants.SHELL_CODEC_FRAME_LENGTH; k++)
{
abs_q = (sbyte)Inlines.silk_abs(pulses[pulses_ptr + k]);
for (j = nLS; j > 0; j--)
{
bit = Inlines.silk_RSHIFT(abs_q, j) & 1;
psRangeEnc.enc_icdf(bit, Tables.silk_lsb_iCDF, 8);
}
bit = abs_q & 1;
psRangeEnc.enc_icdf(bit, Tables.silk_lsb_iCDF, 8);
}
}
}
/****************/
/* Encode signs */
/****************/
CodeSigns.silk_encode_signs(psRangeEnc, pulses, frame_length, signalType, quantOffsetType, sum_pulses);
}
/// <summary>
/// Encode side-information parameters to payload
/// </summary>
/// <param name="psEncC">I/O Encoder state</param>
/// <param name="psRangeEnc">I/O Compressor data structure</param>
/// <param name="FrameIndex">I Frame number</param>
/// <param name="encode_LBRR">I Flag indicating LBRR data is being encoded</param>
/// <param name="condCoding">I The type of conditional coding to use</param>
internal static void silk_encode_indices(
SilkChannelEncoder psEncC,
EntropyCoder psRangeEnc,
int FrameIndex,
int encode_LBRR,
int condCoding)
{
int i, k, typeOffset;
int encode_absolute_lagIndex, delta_lagIndex;
short[] ec_ix = new short[SilkConstants.MAX_LPC_ORDER];
byte[] pred_Q8 = new byte[SilkConstants.MAX_LPC_ORDER];
SideInfoIndices psIndices;
if (encode_LBRR != 0)
{
psIndices = psEncC.indices_LBRR[FrameIndex];
}
else
{
psIndices = psEncC.indices;
}
/*******************************************/
/* Encode signal type and quantizer offset */
/*******************************************/
typeOffset = 2 * psIndices.signalType + psIndices.quantOffsetType;
Inlines.OpusAssert(typeOffset >= 0 && typeOffset < 6);
Inlines.OpusAssert(encode_LBRR == 0 || typeOffset >= 2);
if (encode_LBRR != 0 || typeOffset >= 2)
{
psRangeEnc.enc_icdf(typeOffset - 2, Tables.silk_type_offset_VAD_iCDF, 8);
}
else
{
psRangeEnc.enc_icdf(typeOffset, Tables.silk_type_offset_no_VAD_iCDF, 8);
}
/****************/
/* Encode gains */
/****************/
/* first subframe */
if (condCoding == SilkConstants.CODE_CONDITIONALLY)
{
/* conditional coding */
Inlines.OpusAssert(psIndices.GainsIndices[0] >= 0 && psIndices.GainsIndices[0] < SilkConstants.MAX_DELTA_GAIN_QUANT - SilkConstants.MIN_DELTA_GAIN_QUANT + 1);
psRangeEnc.enc_icdf(psIndices.GainsIndices[0], Tables.silk_delta_gain_iCDF, 8);
}
else
{
/* independent coding, in two stages: MSB bits followed by 3 LSBs */
Inlines.OpusAssert(psIndices.GainsIndices[0] >= 0 && psIndices.GainsIndices[0] < SilkConstants.N_LEVELS_QGAIN);
psRangeEnc.enc_icdf(Inlines.silk_RSHIFT(psIndices.GainsIndices[0], 3), Tables.silk_gain_iCDF[psIndices.signalType], 8);
psRangeEnc.enc_icdf(psIndices.GainsIndices[0] & 7, Tables.silk_uniform8_iCDF, 8);
}
/* remaining subframes */
for (i = 1; i < psEncC.nb_subfr; i++)
{
Inlines.OpusAssert(psIndices.GainsIndices[i] >= 0 && psIndices.GainsIndices[i] < SilkConstants.MAX_DELTA_GAIN_QUANT - SilkConstants.MIN_DELTA_GAIN_QUANT + 1);
psRangeEnc.enc_icdf(psIndices.GainsIndices[i], Tables.silk_delta_gain_iCDF, 8);
}
/****************/
/* Encode NLSFs */
/****************/
psRangeEnc.enc_icdf(psIndices.NLSFIndices[0], psEncC.psNLSF_CB.CB1_iCDF, ((psIndices.signalType >> 1) * psEncC.psNLSF_CB.nVectors), 8);
NLSF.silk_NLSF_unpack(ec_ix, pred_Q8, psEncC.psNLSF_CB, psIndices.NLSFIndices[0]);
Inlines.OpusAssert(psEncC.psNLSF_CB.order == psEncC.predictLPCOrder);
for (i = 0; i < psEncC.psNLSF_CB.order; i++)
{
if (psIndices.NLSFIndices[i + 1] >= SilkConstants.NLSF_QUANT_MAX_AMPLITUDE)
{
psRangeEnc.enc_icdf(2 * SilkConstants.NLSF_QUANT_MAX_AMPLITUDE, psEncC.psNLSF_CB.ec_iCDF, (ec_ix[i]), 8);
psRangeEnc.enc_icdf(psIndices.NLSFIndices[i + 1] - SilkConstants.NLSF_QUANT_MAX_AMPLITUDE, Tables.silk_NLSF_EXT_iCDF, 8);
}
else if (psIndices.NLSFIndices[i + 1] <= 0 - SilkConstants.NLSF_QUANT_MAX_AMPLITUDE)
{
psRangeEnc.enc_icdf(0, psEncC.psNLSF_CB.ec_iCDF, ec_ix[i], 8);
psRangeEnc.enc_icdf(-psIndices.NLSFIndices[i + 1] - SilkConstants.NLSF_QUANT_MAX_AMPLITUDE, Tables.silk_NLSF_EXT_iCDF, 8);
}
else
{
psRangeEnc.enc_icdf(psIndices.NLSFIndices[i + 1] + SilkConstants.NLSF_QUANT_MAX_AMPLITUDE, psEncC.psNLSF_CB.ec_iCDF, ec_ix[i], 8);
}
}
/* Encode NLSF interpolation factor */
if (psEncC.nb_subfr == SilkConstants.MAX_NB_SUBFR)
{
Inlines.OpusAssert(psIndices.NLSFInterpCoef_Q2 >= 0 && psIndices.NLSFInterpCoef_Q2 < 5);
psRangeEnc.enc_icdf(psIndices.NLSFInterpCoef_Q2, Tables.silk_NLSF_interpolation_factor_iCDF, 8);
}
if (psIndices.signalType == SilkConstants.TYPE_VOICED)
{
/*********************/
/* Encode pitch lags */
/*********************/
/* lag index */
encode_absolute_lagIndex = 1;
if (condCoding == SilkConstants.CODE_CONDITIONALLY && psEncC.ec_prevSignalType == SilkConstants.TYPE_VOICED)
{
/* Delta Encoding */
delta_lagIndex = psIndices.lagIndex - psEncC.ec_prevLagIndex;
if (delta_lagIndex < -8 || delta_lagIndex > 11)
{
delta_lagIndex = 0;
}
else
{
delta_lagIndex = delta_lagIndex + 9;
encode_absolute_lagIndex = 0; /* Only use delta */
}
Inlines.OpusAssert(delta_lagIndex >= 0 && delta_lagIndex < 21);
psRangeEnc.enc_icdf(delta_lagIndex, Tables.silk_pitch_delta_iCDF, 8);
}
if (encode_absolute_lagIndex != 0)
{
/* Absolute encoding */
int pitch_high_bits, pitch_low_bits;
pitch_high_bits = Inlines.silk_DIV32_16(psIndices.lagIndex, Inlines.silk_RSHIFT(psEncC.fs_kHz, 1));
pitch_low_bits = psIndices.lagIndex - Inlines.silk_SMULBB(pitch_high_bits, Inlines.silk_RSHIFT(psEncC.fs_kHz, 1));
Inlines.OpusAssert(pitch_low_bits < psEncC.fs_kHz / 2);
Inlines.OpusAssert(pitch_high_bits < 32);
psRangeEnc.enc_icdf(pitch_high_bits, Tables.silk_pitch_lag_iCDF, 8);
psRangeEnc.enc_icdf(pitch_low_bits, psEncC.pitch_lag_low_bits_iCDF, 8);
}
psEncC.ec_prevLagIndex = psIndices.lagIndex;
/* Countour index */
Inlines.OpusAssert(psIndices.contourIndex >= 0);
Inlines.OpusAssert((psIndices.contourIndex < 34 && psEncC.fs_kHz > 8 && psEncC.nb_subfr == 4) || (psIndices.contourIndex < 11 && psEncC.fs_kHz == 8 && psEncC.nb_subfr == 4) || (psIndices.contourIndex < 12 && psEncC.fs_kHz > 8 && psEncC.nb_subfr == 2) || (psIndices.contourIndex < 3 && psEncC.fs_kHz == 8 && psEncC.nb_subfr == 2));
psRangeEnc.enc_icdf(psIndices.contourIndex, psEncC.pitch_contour_iCDF, 8);
/********************/
/* Encode LTP gains */
/********************/
/* PERIndex value */
Inlines.OpusAssert(psIndices.PERIndex >= 0 && psIndices.PERIndex < 3);
psRangeEnc.enc_icdf(psIndices.PERIndex, Tables.silk_LTP_per_index_iCDF, 8);
/* Codebook Indices */
for (k = 0; k < psEncC.nb_subfr; k++)
{
Inlines.OpusAssert(psIndices.LTPIndex[k] >= 0 && psIndices.LTPIndex[k] < (8 << psIndices.PERIndex));
psRangeEnc.enc_icdf(psIndices.LTPIndex[k], Tables.silk_LTP_gain_iCDF_ptrs[psIndices.PERIndex], 8);
}
/**********************/
/* Encode LTP scaling */
/**********************/
if (condCoding == SilkConstants.CODE_INDEPENDENTLY)
{
Inlines.OpusAssert(psIndices.LTP_scaleIndex >= 0 && psIndices.LTP_scaleIndex < 3);
psRangeEnc.enc_icdf(psIndices.LTP_scaleIndex, Tables.silk_LTPscale_iCDF, 8);
}
Inlines.OpusAssert(condCoding == 0 || psIndices.LTP_scaleIndex == 0);
}
psEncC.ec_prevSignalType = psIndices.signalType;
/***************/
/* Encode seed */
/***************/
Inlines.OpusAssert(psIndices.Seed >= 0 && psIndices.Seed < 4);
psRangeEnc.enc_icdf(psIndices.Seed, Tables.silk_uniform4_iCDF, 8);
}