2 * ISS (.iss) file demuxer
3 * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
5 * This file is part of FFmpeg.
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.
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.
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
24 * Funcom ISS file demuxer
25 * @author Jaikrishnan Menon
26 * for more information on the .iss file format, visit:
27 * http://wiki.multimedia.cx/index.php?title=FunCom_ISS
31 #include "libavutil/avstring.h"
33 #define ISS_SIG "IMA_ADPCM_Sound"
34 #define ISS_SIG_LEN 15
35 #define MAX_TOKEN_SIZE 20
42 static void get_token(ByteIOContext *s, char *buf, int maxlen)
47 while ((c = get_byte(s))) {
54 buf[i] = 0; /* Ensure null terminated, but may be truncated */
57 static int iss_probe(AVProbeData *p)
59 if (strncmp(p->buf, ISS_SIG, ISS_SIG_LEN))
62 return AVPROBE_SCORE_MAX;
65 static av_cold int iss_read_header(AVFormatContext *s, AVFormatParameters *ap)
67 IssDemuxContext *iss = s->priv_data;
68 ByteIOContext *pb = s->pb;
70 char token[MAX_TOKEN_SIZE];
71 int stereo, rate_divisor;
73 get_token(pb, token, sizeof(token)); //"IMA_ADPCM_Sound"
74 get_token(pb, token, sizeof(token)); //packet size
75 sscanf(token, "%d", &iss->packet_size);
76 get_token(pb, token, sizeof(token)); //File ID
77 get_token(pb, token, sizeof(token)); //out size
78 get_token(pb, token, sizeof(token)); //stereo
79 sscanf(token, "%d", &stereo);
80 get_token(pb, token, sizeof(token)); //Unknown1
81 get_token(pb, token, sizeof(token)); //RateDivisor
82 sscanf(token, "%d", &rate_divisor);
83 get_token(pb, token, sizeof(token)); //Unknown2
84 get_token(pb, token, sizeof(token)); //Version ID
85 get_token(pb, token, sizeof(token)); //Size
87 iss->sample_start_pos = url_ftell(pb);
89 st = av_new_stream(s, 0);
91 return AVERROR(ENOMEM);
92 st->codec->codec_type = CODEC_TYPE_AUDIO;
93 st->codec->codec_id = CODEC_ID_ADPCM_IMA_ISS;
94 st->codec->channels = stereo ? 2 : 1;
95 st->codec->sample_rate = 44100;
97 st->codec->sample_rate /= rate_divisor;
98 st->codec->bits_per_coded_sample = 4;
99 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate
100 * st->codec->bits_per_coded_sample;
101 st->codec->block_align = iss->packet_size;
102 av_set_pts_info(st, 32, 1, st->codec->sample_rate);
107 static int iss_read_packet(AVFormatContext *s, AVPacket *pkt)
109 IssDemuxContext *iss = s->priv_data;
110 int ret = av_get_packet(s->pb, pkt, iss->packet_size);
115 pkt->stream_index = 0;
116 pkt->pts = url_ftell(s->pb) - iss->sample_start_pos;
117 if(s->streams[0]->codec->channels > 0)
118 pkt->pts /= s->streams[0]->codec->channels*2;
122 AVInputFormat iss_demuxer = {
124 NULL_IF_CONFIG_SMALL("Funcom ISS format"),
125 sizeof(IssDemuxContext),