/*
  * 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,

 };