libavdevice/alsa-audio.h
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00001 /*
00002  * ALSA input and output
00003  * Copyright (c) 2007 Luca Abeni ( lucabe72 email it )
00004  * Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr )
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * Libav is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with Libav; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00030 #ifndef AVDEVICE_ALSA_AUDIO_H
00031 #define AVDEVICE_ALSA_AUDIO_H
00032 
00033 #include <alsa/asoundlib.h>
00034 #include "config.h"
00035 #include "libavformat/avformat.h"
00036 #include "libavutil/log.h"
00037 
00038 /* XXX: we make the assumption that the soundcard accepts this format */
00039 /* XXX: find better solution with "preinit" method, needed also in
00040         other formats */
00041 #define DEFAULT_CODEC_ID AV_NE(CODEC_ID_PCM_S16BE, CODEC_ID_PCM_S16LE)
00042 
00043 #define ALSA_BUFFER_SIZE_MAX 32768
00044 
00045 typedef struct {
00046     AVClass *class;
00047     snd_pcm_t *h;
00048     int frame_size;  
00049     int period_size; 
00050     int sample_rate; 
00051     int channels;    
00052     void (*reorder_func)(const void *, void *, int);
00053     void *reorder_buf;
00054     int reorder_buf_size; 
00055 } AlsaData;
00056 
00071 int ff_alsa_open(AVFormatContext *s, snd_pcm_stream_t mode,
00072                  unsigned int *sample_rate,
00073                  int channels, enum CodecID *codec_id);
00074 
00082 int ff_alsa_close(AVFormatContext *s1);
00083 
00092 int ff_alsa_xrun_recover(AVFormatContext *s1, int err);
00093 
00094 int ff_alsa_extend_reorder_buf(AlsaData *s, int size);
00095 
00096 #endif /* AVDEVICE_ALSA_AUDIO_H */