mirror of https://github.com/FreeRDP/FreeRDP
337 lines
7.3 KiB
C
337 lines
7.3 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol client.
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* Digital Sound Processing
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*
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* Copyright 2010-2011 Vic Lee
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <freerdp/types.h>
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#include <freerdp/utils/memory.h>
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#include <freerdp/utils/dsp.h>
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uint8* dsp_resample(uint8* src, int bytes_per_sample,
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uint32 schan, uint32 srate, int sframes,
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uint32 rchan, uint32 rrate, int * prframes)
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{
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uint8* dst;
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uint8* p;
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int rframes;
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int rsize;
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int i, j;
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int n1, n2;
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int sbytes, rbytes;
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sbytes = bytes_per_sample * schan;
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rbytes = bytes_per_sample * rchan;
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rframes = sframes * rrate / srate;
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*prframes = rframes;
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rsize = rbytes * rframes;
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dst = (uint8*) xzalloc(rsize);
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p = dst;
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for (i = 0; i < rframes; i++)
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{
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n1 = i * srate / rrate;
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if (n1 >= sframes)
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n1 = sframes - 1;
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n2 = (n1 * rrate == i * srate || n1 == sframes - 1 ? n1 : n1 + 1);
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for (j = 0; j < rbytes; j++)
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{
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/* Nearest Interpolation, probably the easiest, but works */
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*p++ = (i * srate - n1 * rrate > n2 * rrate - i * srate ?
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src[n2 * sbytes + (j % sbytes)] :
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src[n1 * sbytes + (j % sbytes)]);
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}
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}
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return dst;
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}
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/**
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* Microsoft IMA ADPCM specification:
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*
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* http://wiki.multimedia.cx/index.php?title=Microsoft_IMA_ADPCM
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* http://wiki.multimedia.cx/index.php?title=IMA_ADPCM
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*/
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static const sint16 ima_step_index_table[] =
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{
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-1, -1, -1, -1, 2, 4, 6, 8,
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-1, -1, -1, -1, 2, 4, 6, 8
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};
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static const sint16 ima_step_size_table[] =
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{
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7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
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19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
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50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
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130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
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337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
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876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
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2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
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5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
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15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
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};
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static uint16 dsp_decode_ima_adpcm_sample(ADPCM* adpcm,
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int channel, uint8 sample)
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{
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sint32 ss;
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sint32 d;
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ss = ima_step_size_table[adpcm->last_step[channel]];
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d = (ss >> 3);
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if (sample & 1)
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d += (ss >> 2);
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if (sample & 2)
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d += (ss >> 1);
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if (sample & 4)
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d += ss;
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if (sample & 8)
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d = -d;
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d += adpcm->last_sample[channel];
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if (d < -32768)
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d = -32768;
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else if (d > 32767)
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d = 32767;
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adpcm->last_sample[channel] = (sint16) d;
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adpcm->last_step[channel] += ima_step_index_table[sample];
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if (adpcm->last_step[channel] < 0)
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adpcm->last_step[channel] = 0;
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else if (adpcm->last_step[channel] > 88)
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adpcm->last_step[channel] = 88;
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return (uint16) d;
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}
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uint8* dsp_decode_ima_adpcm(ADPCM* adpcm,
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uint8* src, int size, int channels, int block_size, int* out_size)
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{
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uint8* out;
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uint8* dst;
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uint8 sample;
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uint16 decoded;
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int channel;
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int i;
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*out_size = size * 4;
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out = (uint8 *) xzalloc(*out_size);
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dst = out;
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while (size > 0)
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{
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if (size % block_size == 0)
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{
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adpcm->last_sample[0] = (sint16) (((uint16)(*src)) | (((uint16)(*(src + 1))) << 8));
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adpcm->last_step[0] = (sint16) (*(src + 2));
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src += 4;
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size -= 4;
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*out_size -= 16;
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if (channels > 1)
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{
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adpcm->last_sample[1] = (sint16) (((uint16)(*src)) | (((uint16)(*(src + 1))) << 8));
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adpcm->last_step[1] = (sint16) (*(src + 2));
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src += 4;
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size -= 4;
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*out_size -= 16;
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}
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}
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if (channels > 1)
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{
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for (i = 0; i < 8; i++)
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{
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channel = (i < 4 ? 0 : 1);
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sample = ((*src) & 0x0f);
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decoded = dsp_decode_ima_adpcm_sample(adpcm, channel, sample);
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dst[((i & 3) << 3) + (channel << 1)] = (decoded & 0xff);
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dst[((i & 3) << 3) + (channel << 1) + 1] = (decoded >> 8);
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sample = ((*src) >> 4);
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decoded = dsp_decode_ima_adpcm_sample(adpcm, channel, sample);
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dst[((i & 3) << 3) + (channel << 1) + 4] = (decoded & 0xff);
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dst[((i & 3) << 3) + (channel << 1) + 5] = (decoded >> 8);
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src++;
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}
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dst += 32;
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size -= 8;
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}
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else
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{
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sample = ((*src) & 0x0f);
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decoded = dsp_decode_ima_adpcm_sample(adpcm, 0, sample);
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*dst++ = (decoded & 0xff);
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*dst++ = (decoded >> 8);
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sample = ((*src) >> 4);
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decoded = dsp_decode_ima_adpcm_sample(adpcm, 0, sample);
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*dst++ = (decoded & 0xff);
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*dst++ = (decoded >> 8);
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src++;
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size--;
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}
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}
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return out;
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}
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/**
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* 0 1 2 3
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* 2 0 6 4 10 8 14 12 <left>
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*
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* 4 5 6 7
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* 3 1 7 5 11 9 15 13 <right>
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*/
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static const struct
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{
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uint8 byte_num;
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uint8 byte_shift;
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} ima_stereo_encode_map[] =
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{
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{ 0, 0 },
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{ 4, 0 },
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{ 0, 4 },
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{ 4, 4 },
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{ 1, 0 },
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{ 5, 0 },
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{ 1, 4 },
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{ 5, 4 },
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{ 2, 0 },
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{ 6, 0 },
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{ 2, 4 },
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{ 6, 4 },
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{ 3, 0 },
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{ 7, 0 },
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{ 3, 4 },
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{ 7, 4 }
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};
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static uint8 dsp_encode_ima_adpcm_sample(ADPCM* adpcm,
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int channel, sint16 sample)
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{
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sint32 e;
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sint32 d;
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sint32 ss;
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uint8 enc;
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sint32 diff;
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ss = ima_step_size_table[adpcm->last_step[channel]];
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d = e = sample - adpcm->last_sample[channel];
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diff = ss >> 3;
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enc = 0;
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if (e < 0)
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{
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enc = 8;
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e = -e;
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}
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if (e >= ss)
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{
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enc |= 4;
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e -= ss;
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}
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ss >>= 1;
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if (e >= ss)
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{
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enc |= 2;
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e -= ss;
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}
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ss >>= 1;
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if (e >= ss)
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{
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enc |= 1;
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e -= ss;
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}
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if (d < 0)
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diff = d + e - diff;
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else
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diff = d - e + diff;
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diff += adpcm->last_sample[channel];
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if (diff < -32768)
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diff = -32768;
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else if (diff > 32767)
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diff = 32767;
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adpcm->last_sample[channel] = (sint16) diff;
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adpcm->last_step[channel] += ima_step_index_table[enc];
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if (adpcm->last_step[channel] < 0)
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adpcm->last_step[channel] = 0;
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else if (adpcm->last_step[channel] > 88)
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adpcm->last_step[channel] = 88;
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return enc;
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}
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uint8* dsp_encode_ima_adpcm(ADPCM* adpcm,
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uint8* src, int size, int channels, int block_size, int* out_size)
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{
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uint8* out;
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uint8* dst;
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sint16 sample;
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uint8 encoded;
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int i;
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out = (uint8*) xzalloc(size / 2);
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dst = out;
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while (size > 0)
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{
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if ((dst - out) % block_size == 0)
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{
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*dst++ = adpcm->last_sample[0] & 0xff;
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*dst++ = (adpcm->last_sample[0] >> 8) & 0xff;
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*dst++ = (uint8) adpcm->last_step[0];
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*dst++ = 0;
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if (channels > 1)
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{
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*dst++ = adpcm->last_sample[1] & 0xff;
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*dst++ = (adpcm->last_sample[1] >> 8) & 0xff;
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*dst++ = (uint8) adpcm->last_step[1];
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*dst++ = 0;
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}
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}
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if (channels > 1)
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{
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memset(dst, 0, 8);
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for (i = 0; i < 16; i++)
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{
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sample = (sint16) (((uint16)(*src)) | (((uint16)(*(src + 1))) << 8));
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src += 2;
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encoded = dsp_encode_ima_adpcm_sample(adpcm, i % 2, sample);
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dst[ima_stereo_encode_map[i].byte_num] |= encoded << ima_stereo_encode_map[i].byte_shift;
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}
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dst += 8;
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size -= 32;
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}
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else
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{
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sample = (sint16) (((uint16)(*src)) | (((uint16)(*(src + 1))) << 8));
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src += 2;
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encoded = dsp_encode_ima_adpcm_sample(adpcm, 0, sample);
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sample = (sint16) (((uint16)(*src)) | (((uint16)(*(src + 1))) << 8));
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src += 2;
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encoded |= dsp_encode_ima_adpcm_sample(adpcm, 0, sample) << 4;
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*dst++ = encoded;
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size -= 4;
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}
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}
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*out_size = dst - out;
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return out;
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}
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