mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-20 00:05:06 +02:00
169 lines
4.9 KiB
C
169 lines
4.9 KiB
C
/*
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* 3DO 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 threedostr_probe(AVProbeData *p)
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{
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if (memcmp(p->buf, "CTRL", 4) &&
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memcmp(p->buf, "SHDR", 4) &&
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memcmp(p->buf, "SNDS", 4))
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return 0;
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return AVPROBE_SCORE_MAX / 3 * 2;
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}
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static int threedostr_read_header(AVFormatContext *s)
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{
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unsigned chunk, codec = 0, size, ctrl_size = -1, found_shdr = 0;
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AVStream *st;
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while (!avio_feof(s->pb) && !found_shdr) {
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chunk = avio_rl32(s->pb);
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size = avio_rb32(s->pb);
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if (size < 8)
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return AVERROR_INVALIDDATA;
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size -= 8;
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switch (chunk) {
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case MKTAG('C','T','R','L'):
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ctrl_size = size;
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break;
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case MKTAG('S','N','D','S'):
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if (size < 56)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 8);
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if (avio_rl32(s->pb) != MKTAG('S','H','D','R'))
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 24);
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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->sample_rate = avio_rb32(s->pb);
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st->codec->channels = avio_rb32(s->pb);
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if (st->codec->channels <= 0)
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return AVERROR_INVALIDDATA;
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codec = avio_rl32(s->pb);
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avio_skip(s->pb, 4);
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if (ctrl_size == 20 || ctrl_size == 3 || ctrl_size == -1)
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st->duration = (avio_rb32(s->pb) - 1) / st->codec->channels;
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else
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st->duration = avio_rb32(s->pb) * 16 / st->codec->channels;
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size -= 56;
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found_shdr = 1;
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break;
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case MKTAG('S','H','D','R'):
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if (size > 0x78) {
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avio_skip(s->pb, 0x74);
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size -= 0x78;
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if (avio_rl32(s->pb) == MKTAG('C','T','R','L') && size > 4) {
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ctrl_size = avio_rb32(s->pb);
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size -= 4;;
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}
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}
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break;
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default:
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av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk);
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break;
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}
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avio_skip(s->pb, size);
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}
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switch (codec) {
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case MKTAG('S','D','X','2'):
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st->codec->codec_id = AV_CODEC_ID_SDX2_DPCM;
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st->codec->block_align = 1 * st->codec->channels;
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break;
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default:
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avpriv_request_sample(s, "codec %X", codec);
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return AVERROR_PATCHWELCOME;
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}
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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 threedostr_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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unsigned chunk, size, found_ssmp = 0;
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AVStream *st = s->streams[0];
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int64_t pos;
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int ret = 0;
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while (!found_ssmp) {
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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pos = avio_tell(s->pb);
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chunk = avio_rl32(s->pb);
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size = avio_rb32(s->pb);
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if (!size)
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continue;
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if (size < 8)
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return AVERROR_INVALIDDATA;
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size -= 8;
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switch (chunk) {
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case MKTAG('S','N','D','S'):
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if (size <= 16)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 8);
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if (avio_rl32(s->pb) != MKTAG('S','S','M','P'))
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 4);
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size -= 16;
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ret = av_get_packet(s->pb, pkt, size);
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pkt->pos = pos;
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pkt->stream_index = 0;
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pkt->duration = size / st->codec->channels;
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size = 0;
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found_ssmp = 1;
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break;
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default:
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av_log(s, AV_LOG_DEBUG, "skipping unknown chunk: %X\n", chunk);
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break;
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}
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avio_skip(s->pb, size);
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}
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return ret;
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}
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AVInputFormat ff_threedostr_demuxer = {
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.name = "3dostr",
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.long_name = NULL_IF_CONFIG_SMALL("3DO STR"),
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.read_probe = threedostr_probe,
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.read_header = threedostr_read_header,
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.read_packet = threedostr_read_packet,
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.extensions = "str",
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.flags = AVFMT_GENERIC_INDEX,
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};
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