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2ba45a60 DM |
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 { | |
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->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
111 | st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_ISS; | |
112 | if (stereo) { | |
113 | st->codec->channels = 2; | |
114 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; | |
115 | } else { | |
116 | st->codec->channels = 1; | |
117 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
118 | } | |
119 | st->codec->sample_rate = 44100; | |
120 | if(rate_divisor > 0) | |
121 | st->codec->sample_rate /= rate_divisor; | |
122 | st->codec->bits_per_coded_sample = 4; | |
123 | st->codec->bit_rate = st->codec->channels * st->codec->sample_rate | |
124 | * st->codec->bits_per_coded_sample; | |
125 | st->codec->block_align = iss->packet_size; | |
126 | avpriv_set_pts_info(st, 32, 1, st->codec->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]->codec->channels > 0) | |
142 | pkt->pts /= s->streams[0]->codec->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 | }; |