dsp.c File Reference

#include <freerdp/config.h>
#include <winpr/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 INT16	read_int16 (const BYTE *src)
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, UINT32 FramesPerPacket)

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

Macro Definition Documentation

TAG

#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

dsp_decode_ima_adpcm_sample()

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

static

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dsp_encode_ima_adpcm_sample()

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

static

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freerdp_dsp_channel_mix()

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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freerdp_dsp_context_free()

void freerdp_dsp_context_free

(

FREERDP_DSP_CONTEXT *

context

)

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freerdp_dsp_context_new()

FREERDP_DSP_CONTEXT* freerdp_dsp_context_new

(

BOOL

encoder

)

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freerdp_dsp_context_reset()

BOOL freerdp_dsp_context_reset	(	FREERDP_DSP_CONTEXT *	context,
		const AUDIO_FORMAT *	targetFormat,
		UINT32	FramesPerPacket
	)

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freerdp_dsp_decode()

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

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freerdp_dsp_decode_ima_adpcm()

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

static

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freerdp_dsp_decode_ms_adpcm()

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

static

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freerdp_dsp_decode_ms_adpcm_sample()

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

static

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freerdp_dsp_encode()

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

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freerdp_dsp_encode_ima_adpcm()

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

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freerdp_dsp_encode_ms_adpcm()

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

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freerdp_dsp_encode_ms_adpcm_sample()

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

static

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freerdp_dsp_resample()

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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freerdp_dsp_supports_format()

BOOL freerdp_dsp_supports_format	(	const AUDIO_FORMAT *	format,
		BOOL	encode
	)

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read_int16()

static INT16 read_int16 ( const BYTE *  src )

static

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Variable Documentation

byte_num

BYTE byte_num

byte_shift

BYTE byte_shift

ima_step_index_table

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

ima_step_size_table

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>

ms_adpcm_adaptation_table

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

ms_adpcm_coeffs1

const INT32 ms_adpcm_coeffs1[7] = { 256, 512, 0, 192, 240, 460, 392 }

static

ms_adpcm_coeffs2

const INT32 ms_adpcm_coeffs2[7] = { 0, -256, 0, 64, 0, -208, -232 }

static