109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
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/*
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* ALSA input and output
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* Copyright (c) 2007 Luca Abeni ( lucabe72 email it )
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* Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr )
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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* ALSA input and output: definitions and structures
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* @author Luca Abeni ( lucabe72 email it )
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* @author Benoit Fouet ( benoit fouet free fr )
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*/
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#ifndef AVDEVICE_ALSA_H
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#define AVDEVICE_ALSA_H
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#include <alsa/asoundlib.h>
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#include "config.h"
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#include "libavutil/log.h"
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#include "timefilter.h"
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#include "avdevice.h"
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/* XXX: we make the assumption that the soundcard accepts this format */
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/* XXX: find better solution with "preinit" method, needed also in
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other formats */
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#define DEFAULT_CODEC_ID AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE)
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typedef void (*ff_reorder_func)(const void *, void *, int);
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#define ALSA_BUFFER_SIZE_MAX 131072
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typedef struct AlsaData {
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AVClass *class;
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snd_pcm_t *h;
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int frame_size; ///< bytes per sample * channels
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int period_size; ///< preferred size for reads and writes, in frames
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int sample_rate; ///< sample rate set by user
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int channels; ///< number of channels set by user
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int last_period;
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TimeFilter *timefilter;
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void (*reorder_func)(const void *, void *, int);
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void *reorder_buf;
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int reorder_buf_size; ///< in frames
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int64_t timestamp; ///< current timestamp, without latency applied.
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} AlsaData;
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/**
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* Open an ALSA PCM.
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*
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* @param s media file handle
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* @param mode either SND_PCM_STREAM_CAPTURE or SND_PCM_STREAM_PLAYBACK
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* @param sample_rate in: requested sample rate;
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* out: actually selected sample rate
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* @param channels number of channels
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* @param codec_id in: requested AVCodecID or AV_CODEC_ID_NONE;
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* out: actually selected AVCodecID, changed only if
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* AV_CODEC_ID_NONE was requested
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*
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* @return 0 if OK, AVERROR_xxx on error
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*/
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av_warn_unused_result
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int ff_alsa_open(AVFormatContext *s, snd_pcm_stream_t mode,
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unsigned int *sample_rate,
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int channels, enum AVCodecID *codec_id);
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/**
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* Close the ALSA PCM.
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*
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* @param s1 media file handle
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*
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* @return 0
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*/
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int ff_alsa_close(AVFormatContext *s1);
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/**
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* Try to recover from ALSA buffer underrun.
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*
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* @param s1 media file handle
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* @param err error code reported by the previous ALSA call
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*
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* @return 0 if OK, AVERROR_xxx on error
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*/
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av_warn_unused_result
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int ff_alsa_xrun_recover(AVFormatContext *s1, int err);
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av_warn_unused_result
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int ff_alsa_extend_reorder_buf(AlsaData *s, int size);
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av_warn_unused_result
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int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type);
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#endif /* AVDEVICE_ALSA_H */
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