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d5a0eba8a2
The packets given to muxers need not be writable, so it is best to access them via const uint8_t*. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/*
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* Linux audio grab interface
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* Copyright (c) 2000, 2001 Fabrice Bellard
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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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#include "config.h"
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/soundcard.h>
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#include "libavutil/internal.h"
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#include "avdevice.h"
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#include "libavformat/internal.h"
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#include "oss.h"
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static int audio_write_header(AVFormatContext *s1)
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{
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OSSAudioData *s = s1->priv_data;
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AVStream *st;
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int ret;
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st = s1->streams[0];
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s->sample_rate = st->codecpar->sample_rate;
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s->channels = st->codecpar->ch_layout.nb_channels;
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ret = ff_oss_audio_open(s1, 1, s1->url);
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if (ret < 0) {
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return AVERROR(EIO);
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} else {
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return 0;
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}
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}
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static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
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{
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OSSAudioData *s = s1->priv_data;
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const uint8_t *buf = pkt->data;
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int len, ret;
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int size= pkt->size;
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while (size > 0) {
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len = FFMIN(OSS_AUDIO_BLOCK_SIZE - s->buffer_ptr, size);
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memcpy(s->buffer + s->buffer_ptr, buf, len);
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s->buffer_ptr += len;
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if (s->buffer_ptr >= OSS_AUDIO_BLOCK_SIZE) {
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for(;;) {
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ret = write(s->fd, s->buffer, OSS_AUDIO_BLOCK_SIZE);
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if (ret > 0)
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break;
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if (ret < 0 && (errno != EAGAIN && errno != EINTR))
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return AVERROR(EIO);
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}
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s->buffer_ptr = 0;
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}
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buf += len;
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size -= len;
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}
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return 0;
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}
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static int audio_write_trailer(AVFormatContext *s1)
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{
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OSSAudioData *s = s1->priv_data;
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ff_oss_audio_close(s);
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return 0;
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}
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static const AVClass oss_muxer_class = {
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.class_name = "OSS outdev",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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.category = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
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};
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const AVOutputFormat ff_oss_muxer = {
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.name = "oss",
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.long_name = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) playback"),
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.priv_data_size = sizeof(OSSAudioData),
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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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.audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
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.video_codec = AV_CODEC_ID_NONE,
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.write_header = audio_write_header,
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.write_packet = audio_write_packet,
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.write_trailer = audio_write_trailer,
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.flags = AVFMT_NOFILE,
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.priv_class = &oss_muxer_class,
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};
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