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