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91 lines
3.1 KiB
91 lines
3.1 KiB
/* |
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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(const 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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int mult; |
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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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codecpar->ch_layout.nb_channels = avio_rl32(s->pb); |
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st->codecpar->sample_rate = avio_rl32(s->pb); |
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if (st->codecpar->sample_rate <= 0) |
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return AVERROR_INVALIDDATA; |
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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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mult = avio_rl32(s->pb); |
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if (st->codecpar->ch_layout.nb_channels <= 0 || mult <= 0 || |
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mult > INT_MAX / st->codecpar->ch_layout.nb_channels) { |
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av_log(s, AV_LOG_ERROR, "invalid number of channels %d x %d\n", |
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st->codecpar->ch_layout.nb_channels, mult); |
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return AVERROR_INVALIDDATA; |
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} |
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st->codecpar->ch_layout.nb_channels *= mult; |
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if (!align || align > INT_MAX / st->codecpar->ch_layout.nb_channels) |
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return AVERROR_INVALIDDATA; |
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st->codecpar->block_align = align * st->codecpar->ch_layout.nb_channels; |
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switch (codec) { |
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case 4: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break; |
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case 16: st->codecpar->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->codecpar->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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AVCodecParameters *par = s->streams[0]->codecpar; |
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return av_get_packet(s->pb, pkt, par->block_align); |
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} |
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const 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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