2015-10-27 20:58:23 +01:00
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/*
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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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2020-09-17 23:19:18 +02:00
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#include "libavutil/intreadwrite.h"
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2015-10-27 20:58:23 +01:00
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#include "avformat.h"
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#include "internal.h"
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2019-03-21 01:18:37 +01:00
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static int threedostr_probe(const AVProbeData *p)
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2015-10-27 20:58:23 +01:00
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{
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2020-09-17 23:19:18 +02:00
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for (int i = 0; i < p->buf_size;) {
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unsigned chunk = AV_RL32(p->buf + i);
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unsigned size = AV_RB32(p->buf + i + 4);
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2015-10-27 20:58:23 +01:00
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2020-09-17 23:19:18 +02:00
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if (size < 8 || p->buf_size - i < size)
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return 0;
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2020-09-19 00:11:59 +02:00
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i += 8;
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2020-09-17 23:19:18 +02:00
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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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break;
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case MKTAG('S','N','D','S'):
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if (size < 56)
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return 0;
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i += 8;
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if (AV_RL32(p->buf + i) != MKTAG('S','H','D','R'))
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return 0;
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i += 28;
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if (AV_RB32(p->buf + i) <= 0)
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return 0;
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i += 4;
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if (AV_RB32(p->buf + i) <= 0)
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return 0;
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i += 4;
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if (AV_RL32(p->buf + i) == MKTAG('S','D','X','2'))
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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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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i += 0x78;
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size -= 0x78;
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}
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break;
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default:
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break;
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}
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i += size;
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}
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return 0;
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2015-10-27 20:58:23 +01:00
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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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2016-04-10 21:58:15 +02:00
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->sample_rate = avio_rb32(s->pb);
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st->codecpar->channels = avio_rb32(s->pb);
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2021-02-08 14:29:02 +01:00
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if (st->codecpar->channels <= 0 || st->codecpar->sample_rate <= 0)
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2015-10-27 20:58:23 +01:00
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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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2016-04-10 21:58:15 +02:00
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st->duration = (avio_rb32(s->pb) - 1) / st->codecpar->channels;
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2015-10-27 20:58:23 +01:00
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else
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2016-04-10 21:58:15 +02:00
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st->duration = avio_rb32(s->pb) * 16 / st->codecpar->channels;
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2015-10-27 20:58:23 +01:00
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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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2015-10-30 03:02:41 +01:00
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size -= 4;
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2015-10-27 20:58:23 +01:00
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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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2016-04-10 21:58:15 +02:00
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st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM;
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st->codecpar->block_align = 1 * st->codecpar->channels;
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2015-10-27 20:58:23 +01:00
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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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2016-04-10 21:58:15 +02:00
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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2015-10-27 20:58:23 +01:00
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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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2020-07-27 05:19:18 +02:00
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unsigned chunk, size;
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2015-10-27 20:58:23 +01:00
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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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2020-07-27 05:19:18 +02:00
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while (!avio_feof(s->pb)) {
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2015-10-27 20:58:23 +01:00
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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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2016-04-10 21:58:15 +02:00
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pkt->duration = size / st->codecpar->channels;
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2020-07-27 05:19:18 +02:00
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return ret;
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2015-10-27 20:58:23 +01:00
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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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2020-07-27 05:19:18 +02:00
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return AVERROR_EOF;
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2015-10-27 20:58:23 +01:00
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}
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2021-04-19 19:45:24 +02:00
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const AVInputFormat ff_threedostr_demuxer = {
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2015-10-27 20:58:23 +01:00
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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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