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/*****************************************************************
* gavl - a general purpose audio/video processing library
*
* Copyright (c) 2001 - 2012 Members of the Gmerlin project
* gmerlin-general@lists.sourceforge.net
* http://gmerlin.sourceforge.net
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
/* Private structures for the audio converter */
#include <gavl.h>
#include <samplerate.h>
#include "config.h"
struct gavl_audio_options_s
{
/*
* Quality setting from 1 to 5 (0 means undefined).
* 3 means Standard C routines or accellerated version with
* equal quality. Lower numbers mean accellerated versions with lower
* quality.
*/
int quality;
/* Explicit accel_flags are mainly for debugging purposes */
uint32_t accel_flags; /* CPU Acceleration flags */
/* #defines from above */
uint32_t conversion_flags;
gavl_audio_dither_mode_t dither_mode;
gavl_resample_mode_t resample_mode;
const double ** mix_matrix;
};
typedef struct gavl_audio_convert_context_s gavl_audio_convert_context_t;
typedef struct gavl_mix_matrix_s gavl_mix_matrix_t;
typedef void (*gavl_audio_func_t)(struct gavl_audio_convert_context_s * ctx);
typedef struct gavl_samplerate_converter_s gavl_samplerate_converter_t;
typedef struct gavl_audio_dither_context_s gavl_audio_dither_context_t;
struct gavl_samplerate_converter_s
{
int num_resamplers;
SRC_STATE ** resamplers;
SRC_DATA data;
double ratio;
};
struct gavl_audio_convert_context_s
{
const gavl_audio_frame_t * input_frame;
gavl_audio_frame_t * output_frame;
gavl_audio_format_t input_format;
gavl_audio_format_t output_format;
/* Conversion function to be called */
gavl_audio_func_t func;
/* Private data */
gavl_mix_matrix_t * mix_matrix;
gavl_samplerate_converter_t * samplerate_converter;
gavl_audio_dither_context_t * dither_context;
/* For chaining */
struct gavl_audio_convert_context_s * next;
};
gavl_audio_convert_context_t *
gavl_audio_convert_context_create(gavl_audio_format_t * input_format,
gavl_audio_format_t * output_format);
gavl_audio_convert_context_t *
gavl_mix_context_create(gavl_audio_options_t * opt,
gavl_audio_format_t * input_format,
gavl_audio_format_t * output_format);
gavl_audio_convert_context_t *
gavl_interleave_context_create(gavl_audio_options_t * opt,
gavl_audio_format_t * input_format,
gavl_audio_format_t * output_format);
gavl_audio_convert_context_t *
gavl_sampleformat_context_create(gavl_audio_options_t * opt,
gavl_audio_format_t * input_format,
gavl_audio_format_t * output_format);
gavl_audio_convert_context_t *
gavl_samplerate_context_create(gavl_audio_options_t * opt,
gavl_audio_format_t * input_format,
gavl_audio_format_t * output_format);
/* Resampling support */
gavl_audio_convert_context_t *
gavl_samplerate_context_create(gavl_audio_options_t * opt,
gavl_audio_format_t * input_format,
gavl_audio_format_t * output_format);
/* Destroy samplerate converter */
void gavl_samplerate_converter_destroy(gavl_samplerate_converter_t * s);
/* Destroy dither context */
void gavl_audio_dither_context_destroy(gavl_audio_dither_context_t * s);
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