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Rev | Author | Line No. | Line |
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6148 | serge | 1 | /* |
2 | * Psygnosis YOP demuxer |
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3 | * |
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4 | * Copyright (C) 2010 Mohamed Naufal Basheer |
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5 | * derived from the code by |
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6 | * Copyright (C) 2009 Thomas P. Higdon |
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7 | * |
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8 | * This file is part of FFmpeg. |
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9 | * |
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10 | * FFmpeg is free software; you can redistribute it and/or |
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11 | * modify it under the terms of the GNU Lesser General Public |
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12 | * License as published by the Free Software Foundation; either |
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13 | * version 2.1 of the License, or (at your option) any later version. |
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14 | * |
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15 | * FFmpeg is distributed in the hope that it will be useful, |
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * Lesser General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU Lesser General Public |
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21 | * License along with FFmpeg; if not, write to the Free Software |
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22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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23 | */ |
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24 | |||
25 | #include "libavutil/channel_layout.h" |
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26 | #include "libavutil/intreadwrite.h" |
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27 | #include "avformat.h" |
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28 | #include "internal.h" |
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29 | |||
30 | typedef struct yop_dec_context { |
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31 | AVPacket video_packet; |
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32 | |||
33 | int odd_frame; |
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34 | int frame_size; |
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35 | int audio_block_length; |
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36 | int palette_size; |
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37 | } YopDecContext; |
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38 | |||
39 | static int yop_probe(AVProbeData *probe_packet) |
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40 | { |
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41 | if (AV_RB16(probe_packet->buf) == AV_RB16("YO") && |
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42 | probe_packet->buf[2]<10 && |
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43 | probe_packet->buf[3]<10 && |
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44 | probe_packet->buf[6] && |
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45 | probe_packet->buf[7] && |
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46 | !(probe_packet->buf[8] & 1) && |
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47 | !(probe_packet->buf[10] & 1) && |
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48 | AV_RL16(probe_packet->buf + 12 + 6) >= 920 && |
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49 | AV_RL16(probe_packet->buf + 12 + 6) < probe_packet->buf[12] * 3 + 4 + probe_packet->buf[7] * 2048 |
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50 | ) |
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51 | return AVPROBE_SCORE_MAX * 3 / 4; |
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52 | |||
53 | return 0; |
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54 | } |
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55 | |||
56 | static int yop_read_header(AVFormatContext *s) |
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57 | { |
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58 | YopDecContext *yop = s->priv_data; |
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59 | AVIOContext *pb = s->pb; |
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60 | |||
61 | AVCodecContext *audio_dec, *video_dec; |
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62 | AVStream *audio_stream, *video_stream; |
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63 | |||
64 | int frame_rate, ret; |
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65 | |||
66 | audio_stream = avformat_new_stream(s, NULL); |
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67 | video_stream = avformat_new_stream(s, NULL); |
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68 | if (!audio_stream || !video_stream) |
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69 | return AVERROR(ENOMEM); |
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70 | |||
71 | // Extra data that will be passed to the decoder |
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72 | if (ff_alloc_extradata(video_stream->codec, 8)) |
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73 | return AVERROR(ENOMEM); |
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74 | |||
75 | // Audio |
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76 | audio_dec = audio_stream->codec; |
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77 | audio_dec->codec_type = AVMEDIA_TYPE_AUDIO; |
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78 | audio_dec->codec_id = AV_CODEC_ID_ADPCM_IMA_APC; |
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79 | audio_dec->channels = 1; |
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80 | audio_dec->channel_layout = AV_CH_LAYOUT_MONO; |
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81 | audio_dec->sample_rate = 22050; |
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82 | |||
83 | // Video |
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84 | video_dec = video_stream->codec; |
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85 | video_dec->codec_type = AVMEDIA_TYPE_VIDEO; |
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86 | video_dec->codec_id = AV_CODEC_ID_YOP; |
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87 | |||
88 | avio_skip(pb, 6); |
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89 | |||
90 | frame_rate = avio_r8(pb); |
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91 | yop->frame_size = avio_r8(pb) * 2048; |
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92 | video_dec->width = avio_rl16(pb); |
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93 | video_dec->height = avio_rl16(pb); |
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94 | |||
95 | video_stream->sample_aspect_ratio = (AVRational){1, 2}; |
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96 | |||
97 | ret = avio_read(pb, video_dec->extradata, 8); |
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98 | if (ret < 8) |
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99 | return ret < 0 ? ret : AVERROR_EOF; |
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100 | |||
101 | yop->palette_size = video_dec->extradata[0] * 3 + 4; |
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102 | yop->audio_block_length = AV_RL16(video_dec->extradata + 6); |
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103 | |||
104 | video_dec->bit_rate = 8 * (yop->frame_size - yop->audio_block_length) * frame_rate; |
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105 | |||
106 | // 1840 samples per frame, 1 nibble per sample; hence 1840/2 = 920 |
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107 | if (yop->audio_block_length < 920 || |
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108 | yop->audio_block_length + yop->palette_size >= yop->frame_size) { |
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109 | av_log(s, AV_LOG_ERROR, "YOP has invalid header\n"); |
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110 | return AVERROR_INVALIDDATA; |
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111 | } |
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112 | |||
113 | avio_seek(pb, 2048, SEEK_SET); |
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114 | |||
115 | avpriv_set_pts_info(video_stream, 32, 1, frame_rate); |
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116 | |||
117 | return 0; |
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118 | } |
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119 | |||
120 | static int yop_read_packet(AVFormatContext *s, AVPacket *pkt) |
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121 | { |
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122 | YopDecContext *yop = s->priv_data; |
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123 | AVIOContext *pb = s->pb; |
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124 | |||
125 | int ret; |
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126 | int actual_video_data_size = yop->frame_size - |
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127 | yop->audio_block_length - yop->palette_size; |
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128 | |||
129 | yop->video_packet.stream_index = 1; |
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130 | |||
131 | if (yop->video_packet.data) { |
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132 | *pkt = yop->video_packet; |
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133 | yop->video_packet.data = NULL; |
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134 | yop->video_packet.buf = NULL; |
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135 | #if FF_API_DESTRUCT_PACKET |
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136 | FF_DISABLE_DEPRECATION_WARNINGS |
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137 | yop->video_packet.destruct = NULL; |
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138 | FF_ENABLE_DEPRECATION_WARNINGS |
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139 | #endif |
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140 | yop->video_packet.size = 0; |
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141 | pkt->data[0] = yop->odd_frame; |
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142 | pkt->flags |= AV_PKT_FLAG_KEY; |
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143 | yop->odd_frame ^= 1; |
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144 | return pkt->size; |
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145 | } |
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146 | ret = av_new_packet(&yop->video_packet, |
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147 | yop->frame_size - yop->audio_block_length); |
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148 | if (ret < 0) |
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149 | return ret; |
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150 | |||
151 | yop->video_packet.pos = avio_tell(pb); |
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152 | |||
153 | ret = avio_read(pb, yop->video_packet.data, yop->palette_size); |
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154 | if (ret < 0) { |
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155 | goto err_out; |
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156 | }else if (ret < yop->palette_size) { |
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157 | ret = AVERROR_EOF; |
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158 | goto err_out; |
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159 | } |
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160 | |||
161 | ret = av_get_packet(pb, pkt, 920); |
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162 | if (ret < 0) |
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163 | goto err_out; |
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164 | |||
165 | // Set position to the start of the frame |
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166 | pkt->pos = yop->video_packet.pos; |
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167 | |||
168 | avio_skip(pb, yop->audio_block_length - ret); |
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169 | |||
170 | ret = avio_read(pb, yop->video_packet.data + yop->palette_size, |
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171 | actual_video_data_size); |
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172 | if (ret < 0) |
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173 | goto err_out; |
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174 | else if (ret < actual_video_data_size) |
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175 | av_shrink_packet(&yop->video_packet, yop->palette_size + ret); |
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176 | |||
177 | // Arbitrarily return the audio data first |
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178 | return yop->audio_block_length; |
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179 | |||
180 | err_out: |
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181 | av_free_packet(&yop->video_packet); |
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182 | return ret; |
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183 | } |
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184 | |||
185 | static int yop_read_close(AVFormatContext *s) |
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186 | { |
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187 | YopDecContext *yop = s->priv_data; |
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188 | av_free_packet(&yop->video_packet); |
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189 | return 0; |
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190 | } |
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191 | |||
192 | static int yop_read_seek(AVFormatContext *s, int stream_index, |
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193 | int64_t timestamp, int flags) |
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194 | { |
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195 | YopDecContext *yop = s->priv_data; |
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196 | int64_t frame_pos, pos_min, pos_max; |
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197 | int frame_count; |
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198 | |||
199 | if (!stream_index) |
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200 | return -1; |
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201 | |||
202 | pos_min = s->data_offset; |
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203 | pos_max = avio_size(s->pb) - yop->frame_size; |
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204 | frame_count = (pos_max - pos_min) / yop->frame_size; |
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205 | |||
206 | timestamp = FFMAX(0, FFMIN(frame_count, timestamp)); |
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207 | |||
208 | frame_pos = timestamp * yop->frame_size + pos_min; |
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209 | |||
210 | if (avio_seek(s->pb, frame_pos, SEEK_SET) < 0) |
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211 | return -1; |
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212 | |||
213 | av_free_packet(&yop->video_packet); |
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214 | yop->odd_frame = timestamp & 1; |
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215 | |||
216 | return 0; |
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217 | } |
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218 | |||
219 | AVInputFormat ff_yop_demuxer = { |
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220 | .name = "yop", |
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221 | .long_name = NULL_IF_CONFIG_SMALL("Psygnosis YOP"), |
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222 | .priv_data_size = sizeof(YopDecContext), |
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223 | .read_probe = yop_probe, |
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224 | .read_header = yop_read_header, |
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225 | .read_packet = yop_read_packet, |
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226 | .read_close = yop_read_close, |
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227 | .read_seek = yop_read_seek, |
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228 | .extensions = "yop", |
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229 | .flags = AVFMT_GENERIC_INDEX, |
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230 | };>>>>>>>>>>>10>10> |