FreeRDP
dsp.c File Reference
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winpr/crt.h>
#include <freerdp/types.h>
#include <freerdp/log.h>
#include <freerdp/codec/dsp.h>

Macros

#define TAG   FREERDP_TAG("dsp")
 

Functions

static BOOL freerdp_dsp_channel_mix (FREERDP_DSP_CONTEXT *context, const BYTE *src, size_t size, const AUDIO_FORMAT *srcFormat, const BYTE **data, size_t *length)
 
static BOOL freerdp_dsp_resample (FREERDP_DSP_CONTEXT *context, const BYTE *src, size_t size, const AUDIO_FORMAT *srcFormat, const BYTE **data, size_t *length)
 
static UINT16 dsp_decode_ima_adpcm_sample (ADPCM *adpcm, unsigned int channel, BYTE sample)
 
static BOOL freerdp_dsp_decode_ima_adpcm (FREERDP_DSP_CONTEXT *context, const BYTE *src, size_t size, wStream *out)
 
static BYTE dsp_encode_ima_adpcm_sample (ADPCM *adpcm, int channel, INT16 sample)
 
static BOOL freerdp_dsp_encode_ima_adpcm (FREERDP_DSP_CONTEXT *context, const BYTE *src, size_t size, wStream *out)
 
static INLINE INT16 freerdp_dsp_decode_ms_adpcm_sample (ADPCM *adpcm, BYTE sample, int channel)
 
static BOOL freerdp_dsp_decode_ms_adpcm (FREERDP_DSP_CONTEXT *context, const BYTE *src, size_t size, wStream *out)
 
static BYTE freerdp_dsp_encode_ms_adpcm_sample (ADPCM *adpcm, INT32 sample, int channel)
 
static BOOL freerdp_dsp_encode_ms_adpcm (FREERDP_DSP_CONTEXT *context, const BYTE *src, size_t size, wStream *out)
 
FREERDP_DSP_CONTEXT * freerdp_dsp_context_new (BOOL encoder)
 
void freerdp_dsp_context_free (FREERDP_DSP_CONTEXT *context)
 
BOOL freerdp_dsp_encode (FREERDP_DSP_CONTEXT *context, const AUDIO_FORMAT *srcFormat, const BYTE *data, size_t length, wStream *out)
 
BOOL freerdp_dsp_decode (FREERDP_DSP_CONTEXT *context, const AUDIO_FORMAT *srcFormat, const BYTE *data, size_t length, wStream *out)
 
BOOL freerdp_dsp_supports_format (const AUDIO_FORMAT *format, BOOL encode)
 
BOOL freerdp_dsp_context_reset (FREERDP_DSP_CONTEXT *context, const AUDIO_FORMAT *targetFormat)
 

Variables

static const INT16 ima_step_index_table []
 
static const INT16 ima_step_size_table []
 
struct {
   BYTE   byte_num
 
   BYTE   byte_shift
 
ima_stereo_encode_map []
 
static const INT32 ms_adpcm_adaptation_table []
 
static const INT32 ms_adpcm_coeffs1 [7]
 
static const INT32 ms_adpcm_coeffs2 [7]
 

Macro Definition Documentation

#define TAG   FREERDP_TAG("dsp")

FreeRDP: A Remote Desktop Protocol Implementation Digital Sound Processing

Copyright 2010-2011 Vic Lee

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Function Documentation

static UINT16 dsp_decode_ima_adpcm_sample ( ADPCM *  adpcm,
unsigned int  channel,
BYTE  sample 
)
static

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static BYTE dsp_encode_ima_adpcm_sample ( ADPCM *  adpcm,
int  channel,
INT16  sample 
)
static

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static BOOL freerdp_dsp_channel_mix ( FREERDP_DSP_CONTEXT *  context,
const BYTE src,
size_t  size,
const AUDIO_FORMAT srcFormat,
const BYTE **  data,
size_t *  length 
)
static

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void freerdp_dsp_context_free ( FREERDP_DSP_CONTEXT *  context)

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FREERDP_DSP_CONTEXT* freerdp_dsp_context_new ( BOOL  encoder)

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BOOL freerdp_dsp_context_reset ( FREERDP_DSP_CONTEXT *  context,
const AUDIO_FORMAT targetFormat 
)

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BOOL freerdp_dsp_decode ( FREERDP_DSP_CONTEXT *  context,
const AUDIO_FORMAT srcFormat,
const BYTE data,
size_t  length,
wStream *  out 
)

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static BOOL freerdp_dsp_decode_ima_adpcm ( FREERDP_DSP_CONTEXT *  context,
const BYTE src,
size_t  size,
wStream *  out 
)
static

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static BOOL freerdp_dsp_decode_ms_adpcm ( FREERDP_DSP_CONTEXT *  context,
const BYTE src,
size_t  size,
wStream *  out 
)
static

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static INLINE INT16 freerdp_dsp_decode_ms_adpcm_sample ( ADPCM *  adpcm,
BYTE  sample,
int  channel 
)
static

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BOOL freerdp_dsp_encode ( FREERDP_DSP_CONTEXT *  context,
const AUDIO_FORMAT srcFormat,
const BYTE data,
size_t  length,
wStream *  out 
)

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static BOOL freerdp_dsp_encode_ima_adpcm ( FREERDP_DSP_CONTEXT *  context,
const BYTE src,
size_t  size,
wStream *  out 
)
static

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static BOOL freerdp_dsp_encode_ms_adpcm ( FREERDP_DSP_CONTEXT *  context,
const BYTE src,
size_t  size,
wStream *  out 
)
static

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static BYTE freerdp_dsp_encode_ms_adpcm_sample ( ADPCM *  adpcm,
INT32  sample,
int  channel 
)
static

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static BOOL freerdp_dsp_resample ( FREERDP_DSP_CONTEXT *  context,
const BYTE src,
size_t  size,
const AUDIO_FORMAT srcFormat,
const BYTE **  data,
size_t *  length 
)
static

Microsoft Multimedia Standards Update http://download.microsoft.com/download/9/8/6/9863C72A-A3AA-4DDB-B1BA-CA8D17EFD2D4/RIFFNEW.pdf

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BOOL freerdp_dsp_supports_format ( const AUDIO_FORMAT format,
BOOL  encode 
)

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Variable Documentation

BYTE byte_num
BYTE byte_shift
const INT16 ima_step_index_table[]
static
Initial value:
=
{
-1, -1, -1, -1, 2, 4, 6, 8,
-1, -1, -1, -1, 2, 4, 6, 8
}

Microsoft IMA ADPCM specification:

http://wiki.multimedia.cx/index.php?title=Microsoft_IMA_ADPCM http://wiki.multimedia.cx/index.php?title=IMA_ADPCM

const INT16 ima_step_size_table[]
static
Initial value:
=
{
7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
}
const { ... } ima_stereo_encode_map[]
Initial value:
=
{
{ 0, 0 },
{ 4, 0 },
{ 0, 4 },
{ 4, 4 },
{ 1, 0 },
{ 5, 0 },
{ 1, 4 },
{ 5, 4 },
{ 2, 0 },
{ 6, 0 },
{ 2, 4 },
{ 6, 4 },
{ 3, 0 },
{ 7, 0 },
{ 3, 4 },
{ 7, 4 }
}

0 1 2 3 2 0 6 4 10 8 14 12 <left>

4 5 6 7 3 1 7 5 11 9 15 13 <right>

const INT32 ms_adpcm_adaptation_table[]
static
Initial value:
=
{
230, 230, 230, 230, 307, 409, 512, 614,
768, 614, 512, 409, 307, 230, 230, 230
}

Microsoft ADPCM Specification:

http://wiki.multimedia.cx/index.php?title=Microsoft_ADPCM

const INT32 ms_adpcm_coeffs1[7]
static
Initial value:
=
{
256, 512, 0, 192, 240, 460, 392
}
const INT32 ms_adpcm_coeffs2[7]
static
Initial value:
=
{
0, -256, 0, 64, 0, -208, -232
}