| /* |
| * AU muxer and demuxer |
| * Copyright (c) 2001 Fabrice Bellard |
| * |
| * first version by Francois Revol <revol@free.fr> |
| * |
| * 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 |
| */ |
| |
| /* |
| * 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" |
| #include "libavutil/avassert.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) |
| |
| 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_G726LE, 23 }, |
| { AV_CODEC_ID_ADPCM_G722,24 }, |
| { AV_CODEC_ID_ADPCM_G726LE, 25 }, |
| { AV_CODEC_ID_ADPCM_G726LE, 26 }, |
| { AV_CODEC_ID_PCM_ALAW, 27 }, |
| { AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') }, |
| { AV_CODEC_ID_NONE, 0 }, |
| }; |
| |
| #if CONFIG_AU_DEMUXER |
| |
| static int au_probe(AVProbeData *p) |
| { |
| 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 |
| |
| 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; |
| |
| 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) { |
| avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| bps = av_get_bits_per_sample(codec); |
| if (codec == AV_CODEC_ID_ADPCM_G726LE) { |
| if (id == MKBETAG('7','2','6','2')) { |
| bps = 2; |
| } else { |
| const uint8_t bpcss[] = {4, 0, 3, 5}; |
| av_assert0(id >= 23 && id < 23 + 4); |
| bps = bpcss[id - 23]; |
| } |
| } else if (!bps) { |
| avpriv_request_sample(s, "Unknown bits per sample"); |
| 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; |
| } |
| |
| 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->bits_per_coded_sample = bps; |
| 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; |
| } |
| |
| 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 = ff_pcm_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" |
| |
| static int au_write_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| AVCodecContext *enc = s->streams[0]->codec; |
| |
| if (s->nb_streams != 1) { |
| av_log(s, AV_LOG_ERROR, "only one stream is supported\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| enc->codec_tag = ff_codec_get_tag(codec_au_tags, enc->codec_id); |
| if (!enc->codec_tag) { |
| av_log(s, AV_LOG_ERROR, "unsupported codec\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| 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, enc->codec_tag); /* codec ID */ |
| avio_wb32(pb, enc->sample_rate); |
| avio_wb32(pb, enc->channels); |
| avio_wb64(pb, 0); /* annotation field */ |
| 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 }, |
| .flags = AVFMT_NOTIMESTAMPS, |
| }; |
| |
| #endif /* CONFIG_AU_MUXER */ |