91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
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/*
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* SDX demuxer
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* Copyright (c) 2017 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/avstring.h"
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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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static int sdx_probe(const AVProbeData *p)
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{
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if (AV_RB32(p->buf) == AV_RB32("SDX:"))
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return AVPROBE_SCORE_EXTENSION;
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return 0;
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}
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static int sdx_read_header(AVFormatContext *s)
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{
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AVStream *st;
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int depth, length;
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avio_skip(s->pb, 4);
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while (!avio_feof(s->pb)) {
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if (avio_r8(s->pb) == 0x1a)
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break;
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}
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if (avio_r8(s->pb) != 1)
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return AVERROR_INVALIDDATA;
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length = avio_r8(s->pb);
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avio_skip(s->pb, length);
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avio_skip(s->pb, 4);
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depth = avio_r8(s->pb);
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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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->channels = 1;
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st->codecpar->sample_rate = avio_rl32(s->pb);
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switch (depth) {
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case 8:
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st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
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break;
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case 16:
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st->codecpar->codec_id = AV_CODEC_ID_PCM_U16LE;
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break;
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case 24:
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st->codecpar->codec_id = AV_CODEC_ID_PCM_U24LE;
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break;
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case 32:
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st->codecpar->codec_id = AV_CODEC_ID_PCM_U32LE;
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break;
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default:
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return AVERROR_INVALIDDATA;
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}
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avio_skip(s->pb, 16);
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st->codecpar->block_align = depth / 8;
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return 0;
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}
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AVInputFormat ff_sdx_demuxer = {
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.name = "sdx",
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.long_name = NULL_IF_CONFIG_SMALL("Sample Dump eXchange"),
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.read_probe = sdx_probe,
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.read_header = sdx_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 = "sdx",
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.flags = AVFMT_GENERIC_INDEX,
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};
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