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- /*
- * Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at)
- *
- * This file is part of libswresample
- *
- * libswresample is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * libswresample 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with libswresample; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- /**
- * @file
- * libswresample public header
- */
- #ifndef SWR_H
- #define SWR_H
- #include <inttypes.h>
- #include "libavutil/samplefmt.h"
- #define LIBSWRESAMPLE_VERSION_MAJOR 0
- #define LIBSWRESAMPLE_VERSION_MINOR 6
- #define LIBSWRESAMPLE_VERSION_MICRO 100
- #define LIBSWRESAMPLE_VERSION_INT AV_VERSION_INT(LIBSWRESAMPLE_VERSION_MAJOR, \
- LIBSWRESAMPLE_VERSION_MINOR, \
- LIBSWRESAMPLE_VERSION_MICRO)
- #define SWR_CH_MAX 16 ///< Maximum number of channels
- #define SWR_FLAG_RESAMPLE 1 ///< Force resampling even if equal sample rate
- //TODO use int resample ?
- //long term TODO can we enable this dynamically?
- struct SwrContext;
- /**
- * Allocate SwrContext.
- *
- * If you use this function you will need to set the parameters (manually or
- * with swr_alloc_set_opts()) before calling swr_init().
- *
- * @see swr_alloc_set_opts(), swr_init(), swr_free()
- * @return NULL on error, allocated context otherwise
- */
- struct SwrContext *swr_alloc(void);
- /**
- * Initialize context after user parameters have been set.
- *
- * @return AVERROR error code in case of failure.
- */
- int swr_init(struct SwrContext *s);
- /**
- * Allocate SwrContext if needed and set/reset common parameters.
- *
- * This function does not require s to be allocated with swr_alloc(). On the
- * other hand, swr_alloc() can use swr_alloc_set_opts() to set the parameters
- * on the allocated context.
- *
- * @param s Swr context, can be NULL
- * @param out_ch_layout output channel layout (AV_CH_LAYOUT_*)
- * @param out_sample_fmt output sample format (AV_SAMPLE_FMT_*).
- * @param out_sample_rate output sample rate (frequency in Hz)
- * @param in_ch_layout input channel layout (AV_CH_LAYOUT_*)
- * @param in_sample_fmt input sample format (AV_SAMPLE_FMT_*).
- * @param in_sample_rate input sample rate (frequency in Hz)
- * @param log_offset logging level offset
- * @param log_ctx parent logging context, can be NULL
- *
- * @see swr_init(), swr_free()
- * @return NULL on error, allocated context otherwise
- */
- struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
- int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
- int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate,
- int log_offset, void *log_ctx);
- /**
- * Free the given SwrContext and set the pointer to NULL.
- */
- void swr_free(struct SwrContext **s);
- /**
- * Convert audio.
- *
- * in and in_count can be set to 0 to flush the last few samples out at the
- * end.
- *
- * @param s allocated Swr context, with parameters set
- * @param out output buffers, only the first one need be set in case of packed audio
- * @param out_count amount of space available for output in samples per channel
- * @param in input buffers, only the first one need to be set in case of packed audio
- * @param in_count number of input samples available in one channel
- *
- * @return number of samples output per channel
- */
- int swr_convert(struct SwrContext *s, uint8_t *out[SWR_CH_MAX], int out_count,
- const uint8_t *in [SWR_CH_MAX], int in_count);
- /**
- * Activate resampling compensation.
- */
- int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance);
- /**
- * Set a customized input channel mapping.
- *
- * @param s allocated Swr context, not yet initialized
- * @param channel_map customized input channel mapping (array of channel
- * indexes, -1 for a muted channel)
- * @return AVERROR error code in case of failure.
- */
- int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map);
- /**
- * Return the LIBSWRESAMPLE_VERSION_INT constant.
- */
- unsigned swresample_version(void);
- /**
- * Return the swr build-time configuration.
- */
- const char *swresample_configuration(void);
- /**
- * Return the swr license.
- */
- const char *swresample_license(void);
- #endif
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