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118 lines
3.3 KiB
118 lines
3.3 KiB
/* |
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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_SOUNDCARD_H |
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#include <soundcard.h> |
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#else |
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#include <sys/soundcard.h> |
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#endif |
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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 "libavutil/internal.h" |
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#include "libavcodec/avcodec.h" |
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#include "avdevice.h" |
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#include "libavformat/internal.h" |
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#include "oss_audio.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->codec->sample_rate; |
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s->channels = st->codec->channels; |
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ret = ff_oss_audio_open(s1, 1, s1->filename); |
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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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int len, ret; |
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int size= pkt->size; |
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uint8_t *buf= pkt->data; |
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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 muxer", |
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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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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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