| /* |
| * XVAG 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 "libavutil/bswap.h" |
| #include "libavcodec/internal.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| static int xvag_probe(const AVProbeData *p) |
| { |
| if (memcmp(p->buf, "XVAG", 4) || |
| memcmp(p->buf+32, "fmat", 4)) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int xvag_read_header(AVFormatContext *s) |
| { |
| unsigned offset, big_endian, codec; |
| AVStream *st; |
| |
| avio_skip(s->pb, 4); |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| |
| offset = avio_rl32(s->pb); |
| big_endian = offset > av_bswap32(offset); |
| if (big_endian) { |
| offset = av_bswap32(offset); |
| avio_skip(s->pb, 28); |
| codec = avio_rb32(s->pb); |
| st->codecpar->channels = avio_rb32(s->pb); |
| avio_skip(s->pb, 4); |
| st->duration = avio_rb32(s->pb); |
| avio_skip(s->pb, 8); |
| st->codecpar->sample_rate = avio_rb32(s->pb); |
| } else { |
| avio_skip(s->pb, 28); |
| codec = avio_rl32(s->pb); |
| st->codecpar->channels = avio_rl32(s->pb); |
| avio_skip(s->pb, 4); |
| st->duration = avio_rl32(s->pb); |
| avio_skip(s->pb, 8); |
| st->codecpar->sample_rate = avio_rl32(s->pb); |
| } |
| |
| if (st->codecpar->sample_rate <= 0) |
| return AVERROR_INVALIDDATA; |
| if (st->codecpar->channels <= 0 || st->codecpar->channels > FF_SANE_NB_CHANNELS) |
| return AVERROR_INVALIDDATA; |
| |
| switch (codec) { |
| case 0x1c: |
| st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; |
| st->codecpar->block_align = 16 * st->codecpar->channels; |
| break; |
| default: |
| avpriv_request_sample(s, "codec %X", codec); |
| return AVERROR_PATCHWELCOME; |
| }; |
| |
| avio_skip(s->pb, offset - avio_tell(s->pb)); |
| |
| if (avio_rb16(s->pb) == 0xFFFB) { |
| st->codecpar->codec_id = AV_CODEC_ID_MP3; |
| st->codecpar->block_align = 0x1000; |
| st->need_parsing = AVSTREAM_PARSE_FULL_RAW; |
| } |
| |
| avio_skip(s->pb, -2); |
| avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| |
| return 0; |
| } |
| |
| static int xvag_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| AVCodecParameters *par = s->streams[0]->codecpar; |
| |
| return av_get_packet(s->pb, pkt, par->block_align); |
| } |
| |
| AVInputFormat ff_xvag_demuxer = { |
| .name = "xvag", |
| .long_name = NULL_IF_CONFIG_SMALL("Sony PS3 XVAG"), |
| .read_probe = xvag_probe, |
| .read_header = xvag_read_header, |
| .read_packet = xvag_read_packet, |
| .extensions = "xvag", |
| }; |