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6147 | serge | 1 | /* |
2 | * ISS (.iss) file demuxer |
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3 | * Copyright (c) 2008 Jaikrishnan Menon |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | /** |
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23 | * @file |
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24 | * Funcom ISS file demuxer |
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25 | * @author Jaikrishnan Menon |
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26 | * @see http://wiki.multimedia.cx/index.php?title=FunCom_ISS |
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27 | */ |
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28 | |||
29 | #include "libavutil/channel_layout.h" |
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30 | #include "avformat.h" |
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31 | #include "internal.h" |
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32 | #include "libavutil/avstring.h" |
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33 | |||
34 | #define ISS_SIG "IMA_ADPCM_Sound" |
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35 | #define ISS_SIG_LEN 15 |
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36 | #define MAX_TOKEN_SIZE 20 |
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37 | |||
38 | typedef struct IssDemuxContext { |
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39 | int packet_size; |
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40 | int sample_start_pos; |
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41 | } IssDemuxContext; |
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42 | |||
43 | static void get_token(AVIOContext *s, char *buf, int maxlen) |
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44 | { |
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45 | int i = 0; |
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46 | char c; |
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47 | |||
48 | while ((c = avio_r8(s))) { |
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49 | if(c == ' ') |
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50 | break; |
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51 | if (i < maxlen-1) |
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52 | buf[i++] = c; |
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53 | } |
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54 | |||
55 | if(!c) |
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56 | avio_r8(s); |
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57 | |||
58 | buf[i] = 0; /* Ensure null terminated, but may be truncated */ |
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59 | } |
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60 | |||
61 | static int iss_probe(AVProbeData *p) |
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62 | { |
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63 | if (strncmp(p->buf, ISS_SIG, ISS_SIG_LEN)) |
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64 | return 0; |
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65 | |||
66 | return AVPROBE_SCORE_MAX; |
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67 | } |
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68 | |||
69 | static av_cold int iss_read_header(AVFormatContext *s) |
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70 | { |
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71 | IssDemuxContext *iss = s->priv_data; |
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72 | AVIOContext *pb = s->pb; |
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73 | AVStream *st; |
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74 | char token[MAX_TOKEN_SIZE]; |
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75 | int stereo, rate_divisor; |
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76 | |||
77 | get_token(pb, token, sizeof(token)); //"IMA_ADPCM_Sound" |
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78 | get_token(pb, token, sizeof(token)); //packet size |
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79 | if (sscanf(token, "%d", &iss->packet_size) != 1) { |
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80 | av_log(s, AV_LOG_ERROR, "Failed parsing packet size\n"); |
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81 | return AVERROR_INVALIDDATA; |
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82 | } |
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83 | get_token(pb, token, sizeof(token)); //File ID |
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84 | get_token(pb, token, sizeof(token)); //out size |
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85 | get_token(pb, token, sizeof(token)); //stereo |
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86 | if (sscanf(token, "%d", &stereo) != 1) { |
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87 | av_log(s, AV_LOG_ERROR, "Failed parsing stereo flag\n"); |
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88 | return AVERROR_INVALIDDATA; |
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89 | } |
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90 | get_token(pb, token, sizeof(token)); //Unknown1 |
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91 | get_token(pb, token, sizeof(token)); //RateDivisor |
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92 | if (sscanf(token, "%d", &rate_divisor) != 1) { |
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93 | av_log(s, AV_LOG_ERROR, "Failed parsing rate_divisor\n"); |
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94 | return AVERROR_INVALIDDATA; |
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95 | } |
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96 | get_token(pb, token, sizeof(token)); //Unknown2 |
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97 | get_token(pb, token, sizeof(token)); //Version ID |
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98 | get_token(pb, token, sizeof(token)); //Size |
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99 | |||
100 | if (iss->packet_size <= 0) { |
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101 | av_log(s, AV_LOG_ERROR, "packet_size %d is invalid\n", iss->packet_size); |
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102 | return AVERROR_INVALIDDATA; |
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103 | } |
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104 | |||
105 | iss->sample_start_pos = avio_tell(pb); |
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106 | |||
107 | st = avformat_new_stream(s, NULL); |
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108 | if (!st) |
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109 | return AVERROR(ENOMEM); |
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110 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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111 | st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_ISS; |
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112 | if (stereo) { |
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113 | st->codec->channels = 2; |
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114 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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115 | } else { |
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116 | st->codec->channels = 1; |
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117 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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118 | } |
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119 | st->codec->sample_rate = 44100; |
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120 | if(rate_divisor > 0) |
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121 | st->codec->sample_rate /= rate_divisor; |
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122 | st->codec->bits_per_coded_sample = 4; |
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123 | st->codec->bit_rate = st->codec->channels * st->codec->sample_rate |
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124 | * st->codec->bits_per_coded_sample; |
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125 | st->codec->block_align = iss->packet_size; |
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126 | avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate); |
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127 | |||
128 | return 0; |
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129 | } |
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130 | |||
131 | static int iss_read_packet(AVFormatContext *s, AVPacket *pkt) |
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132 | { |
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133 | IssDemuxContext *iss = s->priv_data; |
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134 | int ret = av_get_packet(s->pb, pkt, iss->packet_size); |
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135 | |||
136 | if(ret != iss->packet_size) |
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137 | return AVERROR(EIO); |
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138 | |||
139 | pkt->stream_index = 0; |
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140 | pkt->pts = avio_tell(s->pb) - iss->sample_start_pos; |
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141 | if(s->streams[0]->codec->channels > 0) |
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142 | pkt->pts /= s->streams[0]->codec->channels*2; |
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143 | return 0; |
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144 | } |
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145 | |||
146 | AVInputFormat ff_iss_demuxer = { |
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147 | .name = "iss", |
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148 | .long_name = NULL_IF_CONFIG_SMALL("Funcom ISS"), |
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149 | .priv_data_size = sizeof(IssDemuxContext), |
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150 | .read_probe = iss_probe, |
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151 | .read_header = iss_read_header, |
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152 | .read_packet = iss_read_packet, |
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153 | };=>> |