1/* 2 * RSO demuxer 3 * Copyright (c) 2001 Fabrice Bellard (original AU code) 4 * Copyright (c) 2010 Rafael Carre 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include "libavutil/channel_layout.h" 24#include "libavutil/intreadwrite.h" 25#include "avformat.h" 26#include "internal.h" 27#include "pcm.h" 28#include "rso.h" 29 30static int rso_read_header(AVFormatContext *s) 31{ 32 AVIOContext *pb = s->pb; 33 int id, rate, bps; 34 unsigned int size; 35 enum AVCodecID codec; 36 AVStream *st; 37 38 id = avio_rb16(pb); 39 size = avio_rb16(pb); 40 rate = avio_rb16(pb); 41 avio_rb16(pb); /* play mode ? (0x0000 = don't loop) */ 42 43 codec = ff_codec_get_id(ff_codec_rso_tags, id); 44 45 if (codec == AV_CODEC_ID_ADPCM_IMA_WAV) { 46 avpriv_report_missing_feature(s, "ADPCM in RSO"); 47 return AVERROR_PATCHWELCOME; 48 } 49 50 bps = av_get_bits_per_sample(codec); 51 if (!bps) { 52 avpriv_request_sample(s, "Unknown bits per sample"); 53 return AVERROR_PATCHWELCOME; 54 } 55 56 /* now we are ready: build format streams */ 57 st = avformat_new_stream(s, NULL); 58 if (!st) 59 return AVERROR(ENOMEM); 60 61 st->duration = (size * 8) / bps; 62 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 63 st->codec->codec_tag = id; 64 st->codec->codec_id = codec; 65 st->codec->channels = 1; 66 st->codec->channel_layout = AV_CH_LAYOUT_MONO; 67 st->codec->sample_rate = rate; 68 st->codec->block_align = 1; 69 70 avpriv_set_pts_info(st, 64, 1, rate); 71 72 return 0; 73} 74 75AVInputFormat ff_rso_demuxer = { 76 .name = "rso", 77 .long_name = NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"), 78 .extensions = "rso", 79 .read_header = rso_read_header, 80 .read_packet = ff_pcm_read_packet, 81 .read_seek = ff_pcm_read_seek, 82 .codec_tag = (const AVCodecTag* const []){ff_codec_rso_tags, 0}, 83}; 84