109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
|
/*
|
||
|
|
* Linux audio grab interface
|
||
|
|
* Copyright (c) 2000, 2001 Fabrice Bellard
|
||
|
|
*
|
||
|
|
* This file is part of Libav.
|
||
|
|
*
|
||
|
|
* Libav 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.
|
||
|
|
*
|
||
|
|
* Libav 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 Libav; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "config.h"
|
||
|
|
|
||
|
|
#if HAVE_SOUNDCARD_H
|
||
|
|
#include <soundcard.h>
|
||
|
|
#else
|
||
|
|
#include <sys/soundcard.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <sys/ioctl.h>
|
||
|
|
|
||
|
|
#include "libavutil/internal.h"
|
||
|
|
|
||
|
|
#include "libavcodec/avcodec.h"
|
||
|
|
|
||
|
|
#include "libavformat/avformat.h"
|
||
|
|
#include "libavformat/internal.h"
|
||
|
|
|
||
|
|
#include "oss_audio.h"
|
||
|
|
|
||
|
|
static int audio_write_header(AVFormatContext *s1)
|
||
|
|
{
|
||
|
|
OSSAudioData *s = s1->priv_data;
|
||
|
|
AVStream *st;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
st = s1->streams[0];
|
||
|
|
s->sample_rate = st->codec->sample_rate;
|
||
|
|
s->channels = st->codec->channels;
|
||
|
|
ret = ff_oss_audio_open(s1, 1, s1->filename);
|
||
|
|
if (ret < 0) {
|
||
|
|
return AVERROR(EIO);
|
||
|
|
} else {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
|
||
|
|
{
|
||
|
|
OSSAudioData *s = s1->priv_data;
|
||
|
|
int len, ret;
|
||
|
|
int size= pkt->size;
|
||
|
|
uint8_t *buf= pkt->data;
|
||
|
|
|
||
|
|
while (size > 0) {
|
||
|
|
len = FFMIN(OSS_AUDIO_BLOCK_SIZE - s->buffer_ptr, size);
|
||
|
|
memcpy(s->buffer + s->buffer_ptr, buf, len);
|
||
|
|
s->buffer_ptr += len;
|
||
|
|
if (s->buffer_ptr >= OSS_AUDIO_BLOCK_SIZE) {
|
||
|
|
for(;;) {
|
||
|
|
ret = write(s->fd, s->buffer, OSS_AUDIO_BLOCK_SIZE);
|
||
|
|
if (ret > 0)
|
||
|
|
break;
|
||
|
|
if (ret < 0 && (errno != EAGAIN && errno != EINTR))
|
||
|
|
return AVERROR(EIO);
|
||
|
|
}
|
||
|
|
s->buffer_ptr = 0;
|
||
|
|
}
|
||
|
|
buf += len;
|
||
|
|
size -= len;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int audio_write_trailer(AVFormatContext *s1)
|
||
|
|
{
|
||
|
|
OSSAudioData *s = s1->priv_data;
|
||
|
|
|
||
|
|
ff_oss_audio_close(s);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVOutputFormat ff_oss_muxer = {
|
||
|
|
.name = "oss",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) playback"),
|
||
|
|
.priv_data_size = sizeof(OSSAudioData),
|
||
|
|
/* XXX: we make the assumption that the soundcard accepts this format */
|
||
|
|
/* XXX: find better solution with "preinit" method, needed also in
|
||
|
|
other formats */
|
||
|
|
.audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
|
||
|
|
.video_codec = AV_CODEC_ID_NONE,
|
||
|
|
.write_header = audio_write_header,
|
||
|
|
.write_packet = audio_write_packet,
|
||
|
|
.write_trailer = audio_write_trailer,
|
||
|
|
.flags = AVFMT_NOFILE,
|
||
|
|
};
|