/* * DC STR demuxer * Copyright (c) 2015 Paul B Mahol * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avformat.h"#include "demux.h"#include "internal.h" static int dcstr_probe(const AVProbeData *p){    if (p->buf_size < 224 || memcmp(p->buf + 213, "Sega Stream", 11))        return 0;     return AVPROBE_SCORE_MAX;} static int dcstr_read_header(AVFormatContext *s){    unsigned codec, align;    int mult;    AVStream *st;     st = avformat_new_stream(s, NULL);    if (!st)        return AVERROR(ENOMEM);     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;    st->codecpar->ch_layout.nb_channels = avio_rl32(s->pb);    st->codecpar->sample_rate = avio_rl32(s->pb);    if (st->codecpar->sample_rate <= 0)        return AVERROR_INVALIDDATA;    codec                  = avio_rl32(s->pb);    align                  = avio_rl32(s->pb);    avio_skip(s->pb, 4);    st->duration           = avio_rl32(s->pb);    mult                   = avio_rl32(s->pb);    if (st->codecpar->ch_layout.nb_channels <= 0 || mult <= 0 ||        mult > INT_MAX / st->codecpar->ch_layout.nb_channels) {        av_log(s, AV_LOG_ERROR, "invalid number of channels %d x %d\n",               st->codecpar->ch_layout.nb_channels, mult);        return AVERROR_INVALIDDATA;    }    st->codecpar->ch_layout.nb_channels *= mult;    if (!align || align > INT_MAX / st->codecpar->ch_layout.nb_channels)        return AVERROR_INVALIDDATA;    st->codecpar->block_align = align * st->codecpar->ch_layout.nb_channels;     switch (codec) {    case  4: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA;       break;    case 16: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break;    default: avpriv_request_sample(s, "codec %X", codec);             return AVERROR_PATCHWELCOME;    }     avio_skip(s->pb, 0x800 - avio_tell(s->pb));    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);     return 0;} static int dcstr_read_packet(AVFormatContext *s, AVPacket *pkt){    AVCodecParameters *par    = s->streams[0]->codecpar;    return av_get_packet(s->pb, pkt, par->block_align);} const FFInputFormat ff_dcstr_demuxer = {    .p.name         = "dcstr",    .p.long_name    = NULL_IF_CONFIG_SMALL("Sega DC STR"),    .p.extensions   = "str",    .p.flags        = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK | AVFMT_NOBINSEARCH,    .read_probe     = dcstr_probe,    .read_header    = dcstr_read_header,    .read_packet    = dcstr_read_packet,};