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  1. /*
  2.  * Linux audio play and 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. #include <string.h>
  25.  
  26. #if HAVE_SOUNDCARD_H
  27. #include <soundcard.h>
  28. #else
  29. #include <sys/soundcard.h>
  30. #endif
  31.  
  32. #if HAVE_UNISTD_H
  33. #include <unistd.h>
  34. #endif
  35. #include <fcntl.h>
  36. #include <sys/ioctl.h>
  37.  
  38. #include "libavutil/log.h"
  39.  
  40. #include "libavcodec/avcodec.h"
  41. #include "avdevice.h"
  42.  
  43. #include "oss.h"
  44.  
  45. int ff_oss_audio_open(AVFormatContext *s1, int is_output,
  46.                       const char *audio_device)
  47. {
  48.     OSSAudioData *s = s1->priv_data;
  49.     int audio_fd;
  50.     int tmp, err;
  51.     char *flip = getenv("AUDIO_FLIP_LEFT");
  52.  
  53.     if (is_output)
  54.         audio_fd = avpriv_open(audio_device, O_WRONLY);
  55.     else
  56.         audio_fd = avpriv_open(audio_device, O_RDONLY);
  57.     if (audio_fd < 0) {
  58.         av_log(s1, AV_LOG_ERROR, "%s: %s\n", audio_device, av_err2str(AVERROR(errno)));
  59.         return AVERROR(EIO);
  60.     }
  61.  
  62.     if (flip && *flip == '1') {
  63.         s->flip_left = 1;
  64.     }
  65.  
  66.     /* non blocking mode */
  67.     if (!is_output) {
  68.         if (fcntl(audio_fd, F_SETFL, O_NONBLOCK) < 0) {
  69.             av_log(s1, AV_LOG_WARNING, "%s: Could not enable non block mode (%s)\n", audio_device, av_err2str(AVERROR(errno)));
  70.         }
  71.     }
  72.  
  73.     s->frame_size = OSS_AUDIO_BLOCK_SIZE;
  74.  
  75. #define CHECK_IOCTL_ERROR(event)                                              \
  76.     if (err < 0) {                                                            \
  77.         av_log(s1, AV_LOG_ERROR, #event ": %s\n", av_err2str(AVERROR(errno)));\
  78.         goto fail;                                                            \
  79.     }
  80.  
  81.     /* select format : favour native format
  82.      * We don't CHECK_IOCTL_ERROR here because even if failed OSS still may be
  83.      * usable. If OSS is not usable the SNDCTL_DSP_SETFMTS later is going to
  84.      * fail anyway. */
  85.     err = ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &tmp);
  86.     if (err < 0) {
  87.         av_log(s1, AV_LOG_WARNING, "SNDCTL_DSP_GETFMTS: %s\n", av_err2str(AVERROR(errno)));
  88.     }
  89.  
  90. #if HAVE_BIGENDIAN
  91.     if (tmp & AFMT_S16_BE) {
  92.         tmp = AFMT_S16_BE;
  93.     } else if (tmp & AFMT_S16_LE) {
  94.         tmp = AFMT_S16_LE;
  95.     } else {
  96.         tmp = 0;
  97.     }
  98. #else
  99.     if (tmp & AFMT_S16_LE) {
  100.         tmp = AFMT_S16_LE;
  101.     } else if (tmp & AFMT_S16_BE) {
  102.         tmp = AFMT_S16_BE;
  103.     } else {
  104.         tmp = 0;
  105.     }
  106. #endif
  107.  
  108.     switch(tmp) {
  109.     case AFMT_S16_LE:
  110.         s->codec_id = AV_CODEC_ID_PCM_S16LE;
  111.         break;
  112.     case AFMT_S16_BE:
  113.         s->codec_id = AV_CODEC_ID_PCM_S16BE;
  114.         break;
  115.     default:
  116.         av_log(s1, AV_LOG_ERROR, "Soundcard does not support 16 bit sample format\n");
  117.         close(audio_fd);
  118.         return AVERROR(EIO);
  119.     }
  120.     err=ioctl(audio_fd, SNDCTL_DSP_SETFMT, &tmp);
  121.     CHECK_IOCTL_ERROR(SNDCTL_DSP_SETFMTS)
  122.  
  123.     tmp = (s->channels == 2);
  124.     err = ioctl(audio_fd, SNDCTL_DSP_STEREO, &tmp);
  125.     CHECK_IOCTL_ERROR(SNDCTL_DSP_STEREO)
  126.  
  127.     tmp = s->sample_rate;
  128.     err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &tmp);
  129.     CHECK_IOCTL_ERROR(SNDCTL_DSP_SPEED)
  130.     s->sample_rate = tmp; /* store real sample rate */
  131.     s->fd = audio_fd;
  132.  
  133.     return 0;
  134.  fail:
  135.     close(audio_fd);
  136.     return AVERROR(EIO);
  137. #undef CHECK_IOCTL_ERROR
  138. }
  139.  
  140. int ff_oss_audio_close(OSSAudioData *s)
  141. {
  142.     close(s->fd);
  143.     return 0;
  144. }
  145.