/* * AU muxer and demuxer * Copyright (c) 2001 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* * First version by Francois Revol revol@free.fr * * Reference documents: * http://www.opengroup.org/public/pubs/external/auformat.html * http://www.goice.co.jp/member/mo/formats/au.html */ #include "avformat.h" #include "internal.h" #include "avio_internal.h" #include "pcm.h" /* if we don't know the size in advance */ #define AU_UNKNOWN_SIZE ((uint32_t)(~0)) /* the specification requires an annotation field of at least eight bytes */ #define AU_HEADER_SIZE (24+8) /* The libavcodec codecs we support, and the IDs they have in the file */ static const AVCodecTag codec_au_tags[] = { { AV_CODEC_ID_PCM_MULAW, 1 }, { AV_CODEC_ID_PCM_S8, 2 }, { AV_CODEC_ID_PCM_S16BE, 3 }, { AV_CODEC_ID_PCM_S24BE, 4 }, { AV_CODEC_ID_PCM_S32BE, 5 }, { AV_CODEC_ID_PCM_F32BE, 6 }, { AV_CODEC_ID_PCM_F64BE, 7 }, { AV_CODEC_ID_ADPCM_G722, 24 }, { AV_CODEC_ID_PCM_ALAW, 27 }, { AV_CODEC_ID_NONE, 0 }, }; #if CONFIG_AU_DEMUXER static int au_probe(AVProbeData *p) { /* check file header */ if (p->buf[0] == '.' && p->buf[1] == 's' && p->buf[2] == 'n' && p->buf[3] == 'd') return AVPROBE_SCORE_MAX; else return 0; } #define BLOCK_SIZE 1024 /* au input */ static int au_read_header(AVFormatContext *s) { int size, data_size = 0; unsigned int tag; AVIOContext *pb = s->pb; unsigned int id, channels, rate; int bps; enum AVCodecID codec; AVStream *st; /* check ".snd" header */ tag = avio_rl32(pb); if (tag != MKTAG('.', 's', 'n', 'd')) return AVERROR_INVALIDDATA; size = avio_rb32(pb); /* header size */ data_size = avio_rb32(pb); /* data size in bytes */ if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) { av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size); return AVERROR_INVALIDDATA; } id = avio_rb32(pb); rate = avio_rb32(pb); channels = avio_rb32(pb); if (size > 24) { /* skip unused data */ avio_skip(pb, size - 24); } codec = ff_codec_get_id(codec_au_tags, id); if (codec == AV_CODEC_ID_NONE) { av_log_ask_for_sample(s, "unknown or unsupported codec tag: %u\n", id); return AVERROR_PATCHWELCOME; } bps = av_get_bits_per_sample(codec); if (!bps) { av_log_ask_for_sample(s, "could not determine bits per sample\n"); return AVERROR_PATCHWELCOME; } if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) { av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels); return AVERROR_INVALIDDATA; } if (rate == 0 || rate > INT_MAX) { av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate); return AVERROR_INVALIDDATA; } /* now we are ready: build format streams */ st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_tag = id; st->codec->codec_id = codec; st->codec->channels = channels; st->codec->sample_rate = rate; st->codec->bit_rate = channels * rate * bps; st->codec->block_align = FFMAX(bps * st->codec->channels / 8, 1); if (data_size != AU_UNKNOWN_SIZE) st->duration = (((int64_t)data_size)<<3) / (st->codec->channels * (int64_t)bps); st->start_time = 0; avpriv_set_pts_info(st, 64, 1, rate); return 0; } static int au_read_packet(AVFormatContext *s, AVPacket *pkt) { int ret; ret = av_get_packet(s->pb, pkt, BLOCK_SIZE * s->streams[0]->codec->block_align); if (ret < 0) return ret; pkt->stream_index = 0; pkt->duration = ret / s->streams[0]->codec->block_align; return 0; } AVInputFormat ff_au_demuxer = { .name = "au", .long_name = NULL_IF_CONFIG_SMALL("Sun AU"), .read_probe = au_probe, .read_header = au_read_header, .read_packet = au_read_packet, .read_seek = ff_pcm_read_seek, .codec_tag = (const AVCodecTag* const []){ codec_au_tags, 0 }, }; #endif /* CONFIG_AU_DEMUXER */ #if CONFIG_AU_MUXER #include "rawenc.h" /* AUDIO_FILE header */ static int put_au_header(AVIOContext *pb, AVCodecContext *enc) { if(!enc->codec_tag) return -1; ffio_wfourcc(pb, ".snd"); /* magic number */ avio_wb32(pb, AU_HEADER_SIZE); /* header size */ avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */ avio_wb32(pb, (uint32_t)enc->codec_tag); /* codec ID */ avio_wb32(pb, enc->sample_rate); avio_wb32(pb, (uint32_t)enc->channels); avio_wb64(pb, 0); /* annotation field */ return 0; } static int au_write_header(AVFormatContext *s) { AVIOContext *pb = s->pb; /* format header */ if (put_au_header(pb, s->streams[0]->codec) < 0) { return AVERROR(EINVAL); } avio_flush(pb); return 0; } static int au_write_trailer(AVFormatContext *s) { AVIOContext *pb = s->pb; int64_t file_size = avio_tell(pb); if (s->pb->seekable && file_size < INT32_MAX) { /* update file size */ avio_seek(pb, 8, SEEK_SET); avio_wb32(pb, (uint32_t)(file_size - AU_HEADER_SIZE)); avio_seek(pb, file_size, SEEK_SET); avio_flush(pb); } return 0; } AVOutputFormat ff_au_muxer = { .name = "au", .long_name = NULL_IF_CONFIG_SMALL("Sun AU"), .mime_type = "audio/basic", .extensions = "au", .audio_codec = AV_CODEC_ID_PCM_S16BE, .video_codec = AV_CODEC_ID_NONE, .write_header = au_write_header, .write_packet = ff_raw_write_packet, .write_trailer = au_write_trailer, .codec_tag = (const AVCodecTag* const []){ codec_au_tags, 0 }, }; #endif /* CONFIG_AU_MUXER */