FreeRDP/include/freerdp/utils/dsp.h

/**
 * FreeRDP: A Remote Desktop Protocol client.
 * 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.
 */

#ifndef __DSP_UTILS_H
#define __DSP_UTILS_H

#include <freerdp/api.h>

struct _ADPCM
{
	sint16 last_sample[2];
	sint16 last_step[2];
};
typedef struct _ADPCM ADPCM;

typedef struct _FREERDP_DSP_CONTEXT FREERDP_DSP_CONTEXT;
struct _FREERDP_DSP_CONTEXT
{
	uint8* resampled_buffer;
	uint32 resampled_size;
	uint32 resampled_frames;
	uint32 resampled_maxlength;

	uint8* adpcm_buffer;
	uint32 adpcm_size;
	uint32 adpcm_maxlength;

	ADPCM adpcm;

	void (*resample)(FREERDP_DSP_CONTEXT* context,
		const uint8* src, int bytes_per_sample,
		uint32 schan, uint32 srate, int sframes,
		uint32 rchan, uint32 rrate);

	void (*decode_ima_adpcm)(FREERDP_DSP_CONTEXT* context,
		const uint8* src, int size, int channels, int block_size);
	void (*encode_ima_adpcm)(FREERDP_DSP_CONTEXT* context,
		const uint8* src, int size, int channels, int block_size);
};

FREERDP_API FREERDP_DSP_CONTEXT* freerdp_dsp_context_new(void);
FREERDP_API void freerdp_dsp_context_free(FREERDP_DSP_CONTEXT* context);
#define freerdp_dsp_context_reset_adpcm(_c) memset(&_c->adpcm, 0, sizeof(ADPCM))

#endif /* __DSP_UTILS_H */