diff options
Diffstat (limited to 'ffmpeg/libavformat/au.c')
| -rw-r--r-- | ffmpeg/libavformat/au.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/au.c b/ffmpeg/libavformat/au.c new file mode 100644 index 0000000..a29e802 --- /dev/null +++ b/ffmpeg/libavformat/au.c @@ -0,0 +1,211 @@ +/* + * 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) + +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) +{ + 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 (!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->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 }, +}; + +#endif /* CONFIG_AU_MUXER */ |