mirror of
https://github.com/xenia-project/FFmpeg.git
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116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/*
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* IRCAM demuxer
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#include "pcm.h"
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#include "ircam.h"
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static int ircam_probe(AVProbeData *p)
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{
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if ((p->buf[0] == 0x64 && p->buf[1] == 0xA3 && p->buf[3] == 0x00 &&
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p->buf[2] >= 1 && p->buf[2] <= 4) ||
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(p->buf[3] == 0x64 && p->buf[2] == 0xA3 && p->buf[0] == 0x00 &&
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p->buf[1] >= 1 && p->buf[1] <= 3) &&
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AV_RN32(p->buf + 4) && AV_RN32(p->buf + 8))
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return AVPROBE_SCORE_MAX / 4 * 3;
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return 0;
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}
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static const struct endianess {
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uint32_t magic;
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int is_le;
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} table[] = {
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{ 0x64A30100, 0 },
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{ 0x64A30200, 1 },
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{ 0x64A30300, 0 },
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{ 0x64A30400, 1 },
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{ 0x0001A364, 1 },
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{ 0x0002A364, 0 },
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{ 0x0003A364, 1 },
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};
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static int ircam_read_header(AVFormatContext *s)
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{
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uint32_t magic, sample_rate, channels, tag;
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const AVCodecTag *tags;
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int le = -1, i;
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AVStream *st;
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magic = avio_rl32(s->pb);
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for (i = 0; i < 7; i++) {
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if (magic == table[i].magic) {
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le = table[i].is_le;
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break;
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}
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}
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if (le == 1) {
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sample_rate = av_int2float(avio_rl32(s->pb));
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channels = avio_rl32(s->pb);
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tag = avio_rl32(s->pb);
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tags = ff_codec_ircam_le_tags;
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} else if (le == 0) {
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sample_rate = av_int2float(avio_rb32(s->pb));
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channels = avio_rb32(s->pb);
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tag = avio_rb32(s->pb);
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tags = ff_codec_ircam_be_tags;
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} else {
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return AVERROR_INVALIDDATA;
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}
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if (!channels || !sample_rate)
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return AVERROR_INVALIDDATA;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->channels = channels;
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st->codec->sample_rate = sample_rate;
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st->codec->codec_id = ff_codec_get_id(tags, tag);
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if (st->codec->codec_id == AV_CODEC_ID_NONE) {
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av_log(s, AV_LOG_ERROR, "unknown tag %X\n", tag);
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return AVERROR_INVALIDDATA;
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}
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st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
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st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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avio_skip(s->pb, 1008);
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return 0;
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}
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AVInputFormat ff_ircam_demuxer = {
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.name = "ircam",
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.long_name = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),
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.read_probe = ircam_probe,
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.read_header = ircam_read_header,
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.read_packet = ff_pcm_read_packet,
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.read_seek = ff_pcm_read_seek,
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.extensions = "sf,ircam",
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.flags = AVFMT_GENERIC_INDEX,
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};
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