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- /*
- * Linux audio grab interface
- * Copyright (c) 2000, 2001 Fabrice Bellard
- *
- * 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 "config.h"
- #if HAVE_SOUNDCARD_H
- #include <soundcard.h>
- #else
- #include <sys/soundcard.h>
- #endif
- #if HAVE_UNISTD_H
- #include <unistd.h>
- #endif
- #include <fcntl.h>
- #include <sys/ioctl.h>
- #include "libavutil/internal.h"
- #include "libavcodec/avcodec.h"
- #include "avdevice.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;
- }
- static const AVClass oss_muxer_class = {
- .class_name = "OSS muxer",
- .item_name = av_default_item_name,
- .version = LIBAVUTIL_VERSION_INT,
- .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
- };
- 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,
- .priv_class = &oss_muxer_class,
- };
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