aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* sndio play and grab interface
* Copyright (c) 2010 Jacob Meuser
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include <sndio.h>
#include "avdevice.h"
#include "libavdevice/sndio.h"
static inline void movecb(void *addr, int delta)
{
SndioData *s = addr;
s->hwpos += delta * s->channels * s->bps;
}
av_cold int ff_sndio_open(AVFormatContext *s1, int is_output,
const char *audio_device)
{
SndioData *s = s1->priv_data;
struct sio_hdl *hdl;
struct sio_par par;
hdl = sio_open(audio_device, is_output ? SIO_PLAY : SIO_REC, 0);
if (!hdl) {
av_log(s1, AV_LOG_ERROR, "Could not open sndio device\n");
return AVERROR(EIO);
}
sio_initpar(&par);
par.bits = 16;
par.sig = 1;
par.le = SIO_LE_NATIVE;
if (is_output)
par.pchan = s->channels;
else
par.rchan = s->channels;
par.rate = s->sample_rate;
if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
av_log(s1, AV_LOG_ERROR, "Impossible to set sndio parameters, "
"channels: %d sample rate: %d\n", s->channels, s->sample_rate);
goto fail;
}
if (par.bits != 16 || par.sig != 1 ||
(is_output && (par.pchan != s->channels)) ||
(!is_output && (par.rchan != s->channels)) ||
(par.rate != s->sample_rate)) {
av_log(s1, AV_LOG_ERROR, "Could not set appropriate sndio parameters, "
"channels: %d sample rate: %d\n", s->channels, s->sample_rate);
goto fail;
}
s->buffer_size = par.round * par.bps *
(is_output ? par.pchan : par.rchan);
if (is_output) {
s->buffer = av_malloc(s->buffer_size);
if (!s->buffer) {
av_log(s1, AV_LOG_ERROR, "Could not allocate buffer\n");
goto fail;
}
}
s->codec_id = par.le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
s->channels = is_output ? par.pchan : par.rchan;
s->sample_rate = par.rate;
s->bps = par.bps;
sio_onmove(hdl, movecb, s);
if (!sio_start(hdl)) {
av_log(s1, AV_LOG_ERROR, "Could not start sndio\n");
goto fail;
}
s->hdl = hdl;
return 0;
fail:
av_freep(&s->buffer);
if (hdl)
sio_close(hdl);
return AVERROR(EIO);
}
int ff_sndio_close(SndioData *s)
{
av_freep(&s->buffer);
if (s->hdl)
sio_close(s->hdl);
return 0;
}
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