blob: 95b35dc78a9cab78843f019a83c017f62bd0acc0
1 | /* |
2 | * ISS (.iss) file demuxer |
3 | * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net> |
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 | /** |
23 | * @file |
24 | * Funcom ISS file demuxer |
25 | * @author Jaikrishnan Menon |
26 | * @see http://wiki.multimedia.cx/index.php?title=FunCom_ISS |
27 | */ |
28 | |
29 | #include "libavutil/channel_layout.h" |
30 | #include "avformat.h" |
31 | #include "internal.h" |
32 | #include "libavutil/avstring.h" |
33 | |
34 | #define ISS_SIG "IMA_ADPCM_Sound" |
35 | #define ISS_SIG_LEN 15 |
36 | #define MAX_TOKEN_SIZE 20 |
37 | |
38 | typedef struct IssDemuxContext { |
39 | int packet_size; |
40 | int sample_start_pos; |
41 | } IssDemuxContext; |
42 | |
43 | static void get_token(AVIOContext *s, char *buf, int maxlen) |
44 | { |
45 | int i = 0; |
46 | char c; |
47 | |
48 | while ((c = avio_r8(s))) { |
49 | if(c == ' ') |
50 | break; |
51 | if (i < maxlen-1) |
52 | buf[i++] = c; |
53 | } |
54 | |
55 | if(!c) |
56 | avio_r8(s); |
57 | |
58 | buf[i] = 0; /* Ensure null terminated, but may be truncated */ |
59 | } |
60 | |
61 | static int iss_probe(AVProbeData *p) |
62 | { |
63 | if (strncmp(p->buf, ISS_SIG, ISS_SIG_LEN)) |
64 | return 0; |
65 | |
66 | return AVPROBE_SCORE_MAX; |
67 | } |
68 | |
69 | static av_cold int iss_read_header(AVFormatContext *s) |
70 | { |
71 | IssDemuxContext *iss = s->priv_data; |
72 | AVIOContext *pb = s->pb; |
73 | AVStream *st; |
74 | char token[MAX_TOKEN_SIZE]; |
75 | int stereo, rate_divisor; |
76 | |
77 | get_token(pb, token, sizeof(token)); //"IMA_ADPCM_Sound" |
78 | get_token(pb, token, sizeof(token)); //packet size |
79 | if (sscanf(token, "%d", &iss->packet_size) != 1) { |
80 | av_log(s, AV_LOG_ERROR, "Failed parsing packet size\n"); |
81 | return AVERROR_INVALIDDATA; |
82 | } |
83 | get_token(pb, token, sizeof(token)); //File ID |
84 | get_token(pb, token, sizeof(token)); //out size |
85 | get_token(pb, token, sizeof(token)); //stereo |
86 | if (sscanf(token, "%d", &stereo) != 1) { |
87 | av_log(s, AV_LOG_ERROR, "Failed parsing stereo flag\n"); |
88 | return AVERROR_INVALIDDATA; |
89 | } |
90 | get_token(pb, token, sizeof(token)); //Unknown1 |
91 | get_token(pb, token, sizeof(token)); //RateDivisor |
92 | if (sscanf(token, "%d", &rate_divisor) != 1) { |
93 | av_log(s, AV_LOG_ERROR, "Failed parsing rate_divisor\n"); |
94 | return AVERROR_INVALIDDATA; |
95 | } |
96 | get_token(pb, token, sizeof(token)); //Unknown2 |
97 | get_token(pb, token, sizeof(token)); //Version ID |
98 | get_token(pb, token, sizeof(token)); //Size |
99 | |
100 | if (iss->packet_size <= 0) { |
101 | av_log(s, AV_LOG_ERROR, "packet_size %d is invalid\n", iss->packet_size); |
102 | return AVERROR_INVALIDDATA; |
103 | } |
104 | |
105 | iss->sample_start_pos = avio_tell(pb); |
106 | |
107 | st = avformat_new_stream(s, NULL); |
108 | if (!st) |
109 | return AVERROR(ENOMEM); |
110 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
111 | st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_ISS; |
112 | if (stereo) { |
113 | st->codecpar->channels = 2; |
114 | st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; |
115 | } else { |
116 | st->codecpar->channels = 1; |
117 | st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
118 | } |
119 | st->codecpar->sample_rate = 44100; |
120 | if(rate_divisor > 0) |
121 | st->codecpar->sample_rate /= rate_divisor; |
122 | st->codecpar->bits_per_coded_sample = 4; |
123 | st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate |
124 | * st->codecpar->bits_per_coded_sample; |
125 | st->codecpar->block_align = iss->packet_size; |
126 | avpriv_set_pts_info(st, 32, 1, st->codecpar->sample_rate); |
127 | |
128 | return 0; |
129 | } |
130 | |
131 | static int iss_read_packet(AVFormatContext *s, AVPacket *pkt) |
132 | { |
133 | IssDemuxContext *iss = s->priv_data; |
134 | int ret = av_get_packet(s->pb, pkt, iss->packet_size); |
135 | |
136 | if(ret != iss->packet_size) |
137 | return AVERROR(EIO); |
138 | |
139 | pkt->stream_index = 0; |
140 | pkt->pts = avio_tell(s->pb) - iss->sample_start_pos; |
141 | if(s->streams[0]->codecpar->channels > 0) |
142 | pkt->pts /= s->streams[0]->codecpar->channels*2; |
143 | return 0; |
144 | } |
145 | |
146 | AVInputFormat ff_iss_demuxer = { |
147 | .name = "iss", |
148 | .long_name = NULL_IF_CONFIG_SMALL("Funcom ISS"), |
149 | .priv_data_size = sizeof(IssDemuxContext), |
150 | .read_probe = iss_probe, |
151 | .read_header = iss_read_header, |
152 | .read_packet = iss_read_packet, |
153 | }; |
154 |