2 * ISS (.iss) file demuxer
3 * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Funcom ISS file demuxer
25 * @author Jaikrishnan Menon
26 * @see http://wiki.multimedia.cx/index.php?title=FunCom_ISS
30 #include "libavutil/avstring.h"
32 #define ISS_SIG "IMA_ADPCM_Sound"
33 #define ISS_SIG_LEN 15
34 #define MAX_TOKEN_SIZE 20
41 static void get_token(AVIOContext *s, char *buf, int maxlen)
46 while ((c = avio_r8(s))) {
56 buf[i] = 0; /* Ensure null terminated, but may be truncated */
59 static int iss_probe(AVProbeData *p)
61 if (strncmp(p->buf, ISS_SIG, ISS_SIG_LEN))
64 return AVPROBE_SCORE_MAX;
67 static av_cold int iss_read_header(AVFormatContext *s, AVFormatParameters *ap)
69 IssDemuxContext *iss = s->priv_data;
70 AVIOContext *pb = s->pb;
72 char token[MAX_TOKEN_SIZE];
73 int stereo, rate_divisor;
75 get_token(pb, token, sizeof(token)); //"IMA_ADPCM_Sound"
76 get_token(pb, token, sizeof(token)); //packet size
77 sscanf(token, "%d", &iss->packet_size);
78 get_token(pb, token, sizeof(token)); //File ID
79 get_token(pb, token, sizeof(token)); //out size
80 get_token(pb, token, sizeof(token)); //stereo
81 sscanf(token, "%d", &stereo);
82 get_token(pb, token, sizeof(token)); //Unknown1
83 get_token(pb, token, sizeof(token)); //RateDivisor
84 sscanf(token, "%d", &rate_divisor);
85 get_token(pb, token, sizeof(token)); //Unknown2
86 get_token(pb, token, sizeof(token)); //Version ID
87 get_token(pb, token, sizeof(token)); //Size
89 iss->sample_start_pos = avio_tell(pb);
91 st = avformat_new_stream(s, NULL);
93 return AVERROR(ENOMEM);
94 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
95 st->codec->codec_id = CODEC_ID_ADPCM_IMA_ISS;
96 st->codec->channels = stereo ? 2 : 1;
97 st->codec->sample_rate = 44100;
99 st->codec->sample_rate /= rate_divisor;
100 st->codec->bits_per_coded_sample = 4;
101 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate
102 * st->codec->bits_per_coded_sample;
103 st->codec->block_align = iss->packet_size;
104 av_set_pts_info(st, 32, 1, st->codec->sample_rate);
109 static int iss_read_packet(AVFormatContext *s, AVPacket *pkt)
111 IssDemuxContext *iss = s->priv_data;
112 int ret = av_get_packet(s->pb, pkt, iss->packet_size);
114 if(ret != iss->packet_size)
117 pkt->stream_index = 0;
118 pkt->pts = avio_tell(s->pb) - iss->sample_start_pos;
119 if(s->streams[0]->codec->channels > 0)
120 pkt->pts /= s->streams[0]->codec->channels*2;
124 AVInputFormat ff_iss_demuxer = {
126 .long_name = NULL_IF_CONFIG_SMALL("Funcom ISS format"),
127 .priv_data_size = sizeof(IssDemuxContext),
128 .read_probe = iss_probe,
129 .read_header = iss_read_header,
130 .read_packet = iss_read_packet,