1/* 2 * ADS/SS2 demuxer 3 * Copyright (c) 2015 Paul B Mahol 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavutil/channel_layout.h" 23#include "avformat.h" 24#include "internal.h" 25 26static int ads_probe(const AVProbeData *p) 27{ 28 if (memcmp(p->buf, "SShd", 4) || 29 memcmp(p->buf+32, "SSbd", 4)) 30 return 0; 31 32 return AVPROBE_SCORE_MAX / 3 * 2; 33} 34 35static int ads_read_header(AVFormatContext *s) 36{ 37 int align, codec; 38 AVStream *st; 39 int64_t size; 40 41 st = avformat_new_stream(s, NULL); 42 if (!st) 43 return AVERROR(ENOMEM); 44 45 avio_skip(s->pb, 8); 46 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; 47 codec = avio_rl32(s->pb); 48 st->codecpar->sample_rate = avio_rl32(s->pb); 49 if (st->codecpar->sample_rate <= 0) 50 return AVERROR_INVALIDDATA; 51 st->codecpar->ch_layout.nb_channels = avio_rl32(s->pb); 52 if (st->codecpar->ch_layout.nb_channels <= 0) 53 return AVERROR_INVALIDDATA; 54 align = avio_rl32(s->pb); 55 if (align <= 0 || align > INT_MAX / st->codecpar->ch_layout.nb_channels) 56 return AVERROR_INVALIDDATA; 57 58 if (codec == 1) 59 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; 60 else 61 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; 62 63 st->codecpar->block_align = st->codecpar->ch_layout.nb_channels * align; 64 avio_skip(s->pb, 12); 65 size = avio_rl32(s->pb); 66 if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_PSX && size >= 0x40) 67 st->duration = (size - 0x40) / 16 / st->codecpar->ch_layout.nb_channels * 28; 68 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); 69 70 return 0; 71} 72 73static int ads_read_packet(AVFormatContext *s, AVPacket *pkt) 74{ 75 AVCodecParameters *par = s->streams[0]->codecpar; 76 int ret; 77 78 ret = av_get_packet(s->pb, pkt, par->block_align); 79 pkt->stream_index = 0; 80 return ret; 81} 82 83const AVInputFormat ff_ads_demuxer = { 84 .name = "ads", 85 .long_name = NULL_IF_CONFIG_SMALL("Sony PS2 ADS"), 86 .read_probe = ads_probe, 87 .read_header = ads_read_header, 88 .read_packet = ads_read_packet, 89 .extensions = "ads,ss2", 90}; 91