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