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125 lines
4.3 KiB
125 lines
4.3 KiB
/* |
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* Copyright (C) 2011 Michael Niedermayer (michaelni@gmx.at) |
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* |
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* This file is part of libswresample |
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* |
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* libswresample is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* libswresample is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with libswresample; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* libswresample public header |
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*/ |
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#ifndef SWR_H |
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#define SWR_H |
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#include <inttypes.h> |
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#include "libavutil/samplefmt.h" |
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#define LIBSWRESAMPLE_VERSION_MAJOR 0 |
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#define LIBSWRESAMPLE_VERSION_MINOR 5 |
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#define LIBSWRESAMPLE_VERSION_MICRO 0 |
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#define SWR_CH_MAX 16 ///< Maximum number of channels |
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#define SWR_FLAG_RESAMPLE 1 ///< Force resampling even if equal sample rate |
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//TODO use int resample ? |
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//long term TODO can we enable this dynamically? |
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struct SwrContext; |
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/** |
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* Allocate SwrContext. |
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* |
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* If you use this function you will need to set the parameters (manually or |
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* with swr_alloc_set_opts()) before calling swr_init(). |
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* |
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* @see swr_alloc_set_opts(), swr_init(), swr_free() |
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* @return NULL on error, allocated context otherwise |
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*/ |
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struct SwrContext *swr_alloc(void); |
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/** |
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* Initialize context after user parameters have been set. |
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* |
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* @return AVERROR error code in case of failure. |
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*/ |
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int swr_init(struct SwrContext *s); |
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/** |
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* Allocate SwrContext if needed and set/reset common parameters. |
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* |
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* This function does not require s to be allocated with swr_alloc(). On the |
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* other hand, swr_alloc() can use swr_alloc_set_opts() to set the parameters |
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* on the allocated context. |
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* |
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* @param s Swr context, can be NULL |
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* @param out_ch_layout output channel layout (AV_CH_LAYOUT_*) |
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* @param out_sample_fmt output sample format (AV_SAMPLE_FMT_*). |
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* @param out_sample_rate output sample rate (frequency in Hz) |
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* @param in_ch_layout input channel layout (AV_CH_LAYOUT_*) |
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* @param in_sample_fmt input sample format (AV_SAMPLE_FMT_*). |
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* @param in_sample_rate input sample rate (frequency in Hz) |
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* @param log_offset logging level offset |
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* @param log_ctx parent logging context, can be NULL |
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* |
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* @see swr_init(), swr_free() |
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* @return NULL on error, allocated context otherwise |
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*/ |
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struct SwrContext *swr_alloc_set_opts(struct SwrContext *s, |
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int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate, |
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int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate, |
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int log_offset, void *log_ctx); |
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/** |
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* Free the given SwrContext and set the pointer to NULL. |
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*/ |
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void swr_free(struct SwrContext **s); |
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/** |
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* Convert audio. |
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* |
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* in and in_count can be set to 0 to flush the last few samples out at the |
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* end. |
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* |
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* @param s allocated Swr context, with parameters set |
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* @param out output buffers, only the first one need be set in case of packed audio |
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* @param out_count amount of space available for output in samples per channel |
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* @param in input buffers, only the first one need to be set in case of packed audio |
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* @param in_count number of input samples available in one channel |
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* |
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* @return number of samples output per channel |
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*/ |
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int swr_convert(struct SwrContext *s, uint8_t *out[SWR_CH_MAX], int out_count, |
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const uint8_t *in [SWR_CH_MAX], int in_count); |
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/** |
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* Activate resampling compensation. |
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*/ |
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void swr_compensate(struct SwrContext *s, int sample_delta, int compensation_distance); |
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/** |
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* Set a customized input channel mapping. |
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* |
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* @param s allocated Swr context, not yet initialized |
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* @param channel_map customized input channel mapping (array of channel |
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* indexes, -1 for a muted channel) |
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* @return AVERROR error code in case of failure. |
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*/ |
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int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map); |
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#endif
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