1/* 2 * AU muxer and demuxer 3 * Copyright (c) 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/* 23 * First version by Francois Revol revol@free.fr 24 * 25 * Reference documents: 26 * http://www.opengroup.org/public/pubs/external/auformat.html 27 * http://www.goice.co.jp/member/mo/formats/au.html 28 */ 29 30#include "avformat.h" 31#include "raw.h" 32#include "riff.h" 33 34/* if we don't know the size in advance */ 35#define AU_UNKNOWN_SIZE ((uint32_t)(~0)) 36 37/* The ffmpeg codecs we support, and the IDs they have in the file */ 38static const AVCodecTag codec_au_tags[] = { 39 { CODEC_ID_PCM_MULAW, 1 }, 40 { CODEC_ID_PCM_S8, 2 }, 41 { CODEC_ID_PCM_S16BE, 3 }, 42 { CODEC_ID_PCM_S24BE, 4 }, 43 { CODEC_ID_PCM_S32BE, 5 }, 44 { CODEC_ID_PCM_F32BE, 6 }, 45 { CODEC_ID_PCM_F64BE, 7 }, 46 { CODEC_ID_PCM_ALAW, 27 }, 47 { 0, 0 }, 48}; 49 50#if CONFIG_AU_MUXER 51/* AUDIO_FILE header */ 52static int put_au_header(ByteIOContext *pb, AVCodecContext *enc) 53{ 54 if(!enc->codec_tag) 55 return -1; 56 put_tag(pb, ".snd"); /* magic number */ 57 put_be32(pb, 24); /* header size */ 58 put_be32(pb, AU_UNKNOWN_SIZE); /* data size */ 59 put_be32(pb, (uint32_t)enc->codec_tag); /* codec ID */ 60 put_be32(pb, enc->sample_rate); 61 put_be32(pb, (uint32_t)enc->channels); 62 return 0; 63} 64 65static int au_write_header(AVFormatContext *s) 66{ 67 ByteIOContext *pb = s->pb; 68 69 s->priv_data = NULL; 70 71 /* format header */ 72 if (put_au_header(pb, s->streams[0]->codec) < 0) { 73 return -1; 74 } 75 76 put_flush_packet(pb); 77 78 return 0; 79} 80 81static int au_write_packet(AVFormatContext *s, AVPacket *pkt) 82{ 83 ByteIOContext *pb = s->pb; 84 put_buffer(pb, pkt->data, pkt->size); 85 return 0; 86} 87 88static int au_write_trailer(AVFormatContext *s) 89{ 90 ByteIOContext *pb = s->pb; 91 int64_t file_size; 92 93 if (!url_is_streamed(s->pb)) { 94 95 /* update file size */ 96 file_size = url_ftell(pb); 97 url_fseek(pb, 8, SEEK_SET); 98 put_be32(pb, (uint32_t)(file_size - 24)); 99 url_fseek(pb, file_size, SEEK_SET); 100 101 put_flush_packet(pb); 102 } 103 104 return 0; 105} 106#endif /* CONFIG_AU_MUXER */ 107 108static int au_probe(AVProbeData *p) 109{ 110 /* check file header */ 111 if (p->buf[0] == '.' && p->buf[1] == 's' && 112 p->buf[2] == 'n' && p->buf[3] == 'd') 113 return AVPROBE_SCORE_MAX; 114 else 115 return 0; 116} 117 118/* au input */ 119static int au_read_header(AVFormatContext *s, 120 AVFormatParameters *ap) 121{ 122 int size; 123 unsigned int tag; 124 ByteIOContext *pb = s->pb; 125 unsigned int id, channels, rate; 126 enum CodecID codec; 127 AVStream *st; 128 129 /* check ".snd" header */ 130 tag = get_le32(pb); 131 if (tag != MKTAG('.', 's', 'n', 'd')) 132 return -1; 133 size = get_be32(pb); /* header size */ 134 get_be32(pb); /* data size */ 135 136 id = get_be32(pb); 137 rate = get_be32(pb); 138 channels = get_be32(pb); 139 140 codec = codec_get_id(codec_au_tags, id); 141 142 if (size >= 24) { 143 /* skip unused data */ 144 url_fseek(pb, size - 24, SEEK_CUR); 145 } 146 147 /* now we are ready: build format streams */ 148 st = av_new_stream(s, 0); 149 if (!st) 150 return -1; 151 st->codec->codec_type = CODEC_TYPE_AUDIO; 152 st->codec->codec_tag = id; 153 st->codec->codec_id = codec; 154 st->codec->channels = channels; 155 st->codec->sample_rate = rate; 156 av_set_pts_info(st, 64, 1, rate); 157 return 0; 158} 159 160#define MAX_SIZE 4096 161 162static int au_read_packet(AVFormatContext *s, 163 AVPacket *pkt) 164{ 165 int ret; 166 167 if (url_feof(s->pb)) 168 return AVERROR(EIO); 169 ret= av_get_packet(s->pb, pkt, MAX_SIZE); 170 if (ret < 0) 171 return AVERROR(EIO); 172 pkt->stream_index = 0; 173 174 /* note: we need to modify the packet size here to handle the last 175 packet */ 176 pkt->size = ret; 177 return 0; 178} 179 180#if CONFIG_AU_DEMUXER 181AVInputFormat au_demuxer = { 182 "au", 183 NULL_IF_CONFIG_SMALL("SUN AU format"), 184 0, 185 au_probe, 186 au_read_header, 187 au_read_packet, 188 NULL, 189 pcm_read_seek, 190 .codec_tag= (const AVCodecTag* const []){codec_au_tags, 0}, 191}; 192#endif 193 194#if CONFIG_AU_MUXER 195AVOutputFormat au_muxer = { 196 "au", 197 NULL_IF_CONFIG_SMALL("SUN AU format"), 198 "audio/basic", 199 "au", 200 0, 201 CODEC_ID_PCM_S16BE, 202 CODEC_ID_NONE, 203 au_write_header, 204 au_write_packet, 205 au_write_trailer, 206 .codec_tag= (const AVCodecTag* const []){codec_au_tags, 0}, 207}; 208#endif //CONFIG_AU_MUXER 209