86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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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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#ifndef FREERDP_UTILS_DSP_H
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#define FREERDP_UTILS_DSP_H
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#include <freerdp/api.h>
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union _ADPCM
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{
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struct
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{
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INT16 last_sample[2];
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INT16 last_step[2];
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} ima;
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struct
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{
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BYTE predictor[2];
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INT32 delta[2];
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INT32 sample1[2];
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INT32 sample2[2];
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} ms;
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};
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typedef union _ADPCM ADPCM;
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typedef struct _FREERDP_DSP_CONTEXT FREERDP_DSP_CONTEXT;
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struct _FREERDP_DSP_CONTEXT
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{
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BYTE* resampled_buffer;
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UINT32 resampled_size;
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UINT32 resampled_frames;
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UINT32 resampled_maxlength;
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BYTE* adpcm_buffer;
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UINT32 adpcm_size;
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UINT32 adpcm_maxlength;
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ADPCM adpcm;
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void (*resample)(FREERDP_DSP_CONTEXT* context,
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const BYTE* src, int bytes_per_sample,
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UINT32 schan, UINT32 srate, int sframes,
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UINT32 rchan, UINT32 rrate);
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void (*decode_ima_adpcm)(FREERDP_DSP_CONTEXT* context,
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const BYTE* src, int size, int channels, int block_size);
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void (*encode_ima_adpcm)(FREERDP_DSP_CONTEXT* context,
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const BYTE* src, int size, int channels, int block_size);
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void (*decode_ms_adpcm)(FREERDP_DSP_CONTEXT* context,
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const BYTE* src, int size, int channels, int block_size);
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void (*encode_ms_adpcm)(FREERDP_DSP_CONTEXT* context,
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const BYTE* src, int size, int channels, int block_size);
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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FREERDP_API FREERDP_DSP_CONTEXT* freerdp_dsp_context_new(void);
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FREERDP_API void freerdp_dsp_context_free(FREERDP_DSP_CONTEXT* context);
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#define freerdp_dsp_context_reset_adpcm(_c) memset(&_c->adpcm, 0, sizeof(ADPCM))
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#ifdef __cplusplus
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}
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#endif
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#endif /* FREERDP_UTILS_DSP_H */
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