| 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_audio.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 | }; |