| 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_audio.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, strerror(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, strerror(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", strerror(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. `err =` kept to eliminate compiler warning. */ |
| 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", strerror(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 | } |