/* * 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_UNISTD_H #include <unistd.h> #endif #include <fcntl.h> #include <sys/ioctl.h> #include <sys/soundcard.h> #include "libavutil/internal.h" #include "libavcodec/avcodec.h" #include "avdevice.h" #include "libavformat/internal.h" #include "oss.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->codecpar->sample_rate; s->channels = st->codecpar->channels; ret = ff_oss_audio_open(s1, 1, s1->url); 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, };