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  1. /*
  2.  * Linux audio grab interface
  3.  * Copyright (c) 2000, 2001 Fabrice Bellard
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "config.h"
  23.  
  24. #if HAVE_SOUNDCARD_H
  25. #include <soundcard.h>
  26. #else
  27. #include <sys/soundcard.h>
  28. #endif
  29.  
  30. #if HAVE_UNISTD_H
  31. #include <unistd.h>
  32. #endif
  33. #include <fcntl.h>
  34. #include <sys/ioctl.h>
  35.  
  36. #include "libavutil/internal.h"
  37.  
  38. #include "libavcodec/avcodec.h"
  39.  
  40. #include "avdevice.h"
  41. #include "libavformat/internal.h"
  42.  
  43. #include "oss.h"
  44.  
  45. static int audio_write_header(AVFormatContext *s1)
  46. {
  47.     OSSAudioData *s = s1->priv_data;
  48.     AVStream *st;
  49.     int ret;
  50.  
  51.     st = s1->streams[0];
  52.     s->sample_rate = st->codec->sample_rate;
  53.     s->channels = st->codec->channels;
  54.     ret = ff_oss_audio_open(s1, 1, s1->filename);
  55.     if (ret < 0) {
  56.         return AVERROR(EIO);
  57.     } else {
  58.         return 0;
  59.     }
  60. }
  61.  
  62. static int audio_write_packet(AVFormatContext *s1, AVPacket *pkt)
  63. {
  64.     OSSAudioData *s = s1->priv_data;
  65.     int len, ret;
  66.     int size= pkt->size;
  67.     uint8_t *buf= pkt->data;
  68.  
  69.     while (size > 0) {
  70.         len = FFMIN(OSS_AUDIO_BLOCK_SIZE - s->buffer_ptr, size);
  71.         memcpy(s->buffer + s->buffer_ptr, buf, len);
  72.         s->buffer_ptr += len;
  73.         if (s->buffer_ptr >= OSS_AUDIO_BLOCK_SIZE) {
  74.             for(;;) {
  75.                 ret = write(s->fd, s->buffer, OSS_AUDIO_BLOCK_SIZE);
  76.                 if (ret > 0)
  77.                     break;
  78.                 if (ret < 0 && (errno != EAGAIN && errno != EINTR))
  79.                     return AVERROR(EIO);
  80.             }
  81.             s->buffer_ptr = 0;
  82.         }
  83.         buf += len;
  84.         size -= len;
  85.     }
  86.     return 0;
  87. }
  88.  
  89. static int audio_write_trailer(AVFormatContext *s1)
  90. {
  91.     OSSAudioData *s = s1->priv_data;
  92.  
  93.     ff_oss_audio_close(s);
  94.     return 0;
  95. }
  96.  
  97. static const AVClass oss_muxer_class = {
  98.     .class_name     = "OSS muxer",
  99.     .item_name      = av_default_item_name,
  100.     .version        = LIBAVUTIL_VERSION_INT,
  101.     .category       = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
  102. };
  103.  
  104. AVOutputFormat ff_oss_muxer = {
  105.     .name           = "oss",
  106.     .long_name      = NULL_IF_CONFIG_SMALL("OSS (Open Sound System) playback"),
  107.     .priv_data_size = sizeof(OSSAudioData),
  108.     /* XXX: we make the assumption that the soundcard accepts this format */
  109.     /* XXX: find better solution with "preinit" method, needed also in
  110.        other formats */
  111.     .audio_codec    = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
  112.     .video_codec    = AV_CODEC_ID_NONE,
  113.     .write_header   = audio_write_header,
  114.     .write_packet   = audio_write_packet,
  115.     .write_trailer  = audio_write_trailer,
  116.     .flags          = AVFMT_NOFILE,
  117.     .priv_class     = &oss_muxer_class,
  118. };
  119.