mirror of
https://github.com/FFmpeg/FFmpeg.git
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82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/*
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* DC STR demuxer
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* Copyright (c) 2015 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 "avformat.h"
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#include "internal.h"
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static int dcstr_probe(AVProbeData *p)
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{
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if (p->buf_size < 224 || memcmp(p->buf + 213, "Sega Stream", 11))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int dcstr_read_header(AVFormatContext *s)
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{
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unsigned codec, align;
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AVStream *st;
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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 = avio_rl32(s->pb);
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st->codec->sample_rate = avio_rl32(s->pb);
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codec = avio_rl32(s->pb);
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align = avio_rl32(s->pb);
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avio_skip(s->pb, 4);
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st->duration = avio_rl32(s->pb);
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st->codec->channels *= avio_rl32(s->pb);
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if (!align || align > INT_MAX / st->codec->channels)
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return AVERROR_INVALIDDATA;
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st->codec->block_align = align * st->codec->channels;
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switch (codec) {
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case 4: st->codec->codec_id = AV_CODEC_ID_ADPCM_AICA; break;
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case 16: st->codec->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break;
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default: avpriv_request_sample(s, "codec %X", codec);
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return AVERROR_PATCHWELCOME;
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}
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avio_skip(s->pb, 0x800 - avio_tell(s->pb));
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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return 0;
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}
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static int dcstr_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVCodecContext *codec = s->streams[0]->codec;
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return av_get_packet(s->pb, pkt, codec->block_align);
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}
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AVInputFormat ff_dcstr_demuxer = {
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.name = "dcstr",
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.long_name = NULL_IF_CONFIG_SMALL("Sega DC STR"),
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.read_probe = dcstr_probe,
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.read_header = dcstr_read_header,
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.read_packet = dcstr_read_packet,
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.extensions = "str",
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.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK | AVFMT_NOBINSEARCH,
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};
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