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6148 | serge | 1 | /* |
2 | * Tiertex Limited SEQ File Demuxer |
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3 | * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net) |
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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 | * Tiertex Limited SEQ file demuxer |
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25 | */ |
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26 | |||
27 | #include "libavutil/channel_layout.h" |
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28 | #include "avformat.h" |
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29 | #include "internal.h" |
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30 | |||
31 | #define SEQ_FRAME_SIZE 6144 |
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32 | #define SEQ_FRAME_W 256 |
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33 | #define SEQ_FRAME_H 128 |
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34 | #define SEQ_NUM_FRAME_BUFFERS 30 |
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35 | #define SEQ_AUDIO_BUFFER_SIZE 882 |
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36 | #define SEQ_SAMPLE_RATE 22050 |
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37 | #define SEQ_FRAME_RATE 25 |
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38 | |||
39 | |||
40 | typedef struct TiertexSeqFrameBuffer { |
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41 | int fill_size; |
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42 | int data_size; |
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43 | unsigned char *data; |
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44 | } TiertexSeqFrameBuffer; |
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45 | |||
46 | typedef struct SeqDemuxContext { |
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47 | int audio_stream_index; |
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48 | int video_stream_index; |
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49 | int current_frame_pts; |
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50 | int current_frame_offs; |
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51 | TiertexSeqFrameBuffer frame_buffers[SEQ_NUM_FRAME_BUFFERS]; |
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52 | int frame_buffers_count; |
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53 | unsigned int current_audio_data_size; |
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54 | unsigned int current_audio_data_offs; |
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55 | unsigned int current_pal_data_size; |
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56 | unsigned int current_pal_data_offs; |
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57 | unsigned int current_video_data_size; |
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58 | unsigned char *current_video_data_ptr; |
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59 | int audio_buffer_full; |
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60 | } SeqDemuxContext; |
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61 | |||
62 | |||
63 | static int seq_probe(AVProbeData *p) |
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64 | { |
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65 | int i; |
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66 | |||
67 | if (p->buf_size < 258) |
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68 | return 0; |
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69 | |||
70 | /* there's no real header in a .seq file, the only thing they have in common */ |
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71 | /* is the first 256 bytes of the file which are always filled with 0 */ |
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72 | for (i = 0; i < 256; i++) |
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73 | if (p->buf[i]) |
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74 | return 0; |
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75 | |||
76 | if(p->buf[256]==0 && p->buf[257]==0) |
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77 | return 0; |
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78 | |||
79 | /* only one fourth of the score since the previous check is too naive */ |
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80 | return AVPROBE_SCORE_MAX / 4; |
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81 | } |
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82 | |||
83 | static int seq_init_frame_buffers(SeqDemuxContext *seq, AVIOContext *pb) |
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84 | { |
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85 | int i, sz; |
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86 | TiertexSeqFrameBuffer *seq_buffer; |
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87 | |||
88 | avio_seek(pb, 256, SEEK_SET); |
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89 | |||
90 | for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) { |
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91 | sz = avio_rl16(pb); |
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92 | if (sz == 0) |
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93 | break; |
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94 | else { |
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95 | seq_buffer = &seq->frame_buffers[i]; |
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96 | seq_buffer->fill_size = 0; |
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97 | seq_buffer->data_size = sz; |
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98 | seq_buffer->data = av_malloc(sz); |
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99 | if (!seq_buffer->data) |
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100 | return AVERROR(ENOMEM); |
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101 | } |
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102 | } |
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103 | seq->frame_buffers_count = i; |
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104 | return 0; |
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105 | } |
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106 | |||
107 | static int seq_fill_buffer(SeqDemuxContext *seq, AVIOContext *pb, int buffer_num, unsigned int data_offs, int data_size) |
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108 | { |
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109 | TiertexSeqFrameBuffer *seq_buffer; |
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110 | |||
111 | if (buffer_num >= SEQ_NUM_FRAME_BUFFERS) |
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112 | return AVERROR_INVALIDDATA; |
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113 | |||
114 | seq_buffer = &seq->frame_buffers[buffer_num]; |
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115 | if (seq_buffer->fill_size + data_size > seq_buffer->data_size || data_size <= 0) |
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116 | return AVERROR_INVALIDDATA; |
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117 | |||
118 | avio_seek(pb, seq->current_frame_offs + data_offs, SEEK_SET); |
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119 | if (avio_read(pb, seq_buffer->data + seq_buffer->fill_size, data_size) != data_size) |
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120 | return AVERROR(EIO); |
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121 | |||
122 | seq_buffer->fill_size += data_size; |
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123 | return 0; |
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124 | } |
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125 | |||
126 | static int seq_parse_frame_data(SeqDemuxContext *seq, AVIOContext *pb) |
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127 | { |
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128 | unsigned int offset_table[4], buffer_num[4]; |
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129 | TiertexSeqFrameBuffer *seq_buffer; |
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130 | int i, e, err; |
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131 | |||
132 | seq->current_frame_offs += SEQ_FRAME_SIZE; |
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133 | avio_seek(pb, seq->current_frame_offs, SEEK_SET); |
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134 | |||
135 | /* sound data */ |
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136 | seq->current_audio_data_offs = avio_rl16(pb); |
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137 | if (seq->current_audio_data_offs) { |
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138 | seq->current_audio_data_size = SEQ_AUDIO_BUFFER_SIZE * 2; |
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139 | } else { |
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140 | seq->current_audio_data_size = 0; |
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141 | } |
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142 | |||
143 | /* palette data */ |
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144 | seq->current_pal_data_offs = avio_rl16(pb); |
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145 | if (seq->current_pal_data_offs) { |
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146 | seq->current_pal_data_size = 768; |
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147 | } else { |
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148 | seq->current_pal_data_size = 0; |
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149 | } |
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150 | |||
151 | /* video data */ |
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152 | for (i = 0; i < 4; i++) |
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153 | buffer_num[i] = avio_r8(pb); |
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154 | |||
155 | for (i = 0; i < 4; i++) |
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156 | offset_table[i] = avio_rl16(pb); |
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157 | |||
158 | for (i = 0; i < 3; i++) { |
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159 | if (offset_table[i]) { |
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160 | for (e = i + 1; e < 3 && offset_table[e] == 0; e++); |
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161 | err = seq_fill_buffer(seq, pb, buffer_num[1 + i], |
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162 | offset_table[i], |
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163 | offset_table[e] - offset_table[i]); |
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164 | if (err) |
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165 | return err; |
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166 | } |
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167 | } |
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168 | |||
169 | if (buffer_num[0] != 255) { |
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170 | if (buffer_num[0] >= SEQ_NUM_FRAME_BUFFERS) |
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171 | return AVERROR_INVALIDDATA; |
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172 | |||
173 | seq_buffer = &seq->frame_buffers[buffer_num[0]]; |
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174 | seq->current_video_data_size = seq_buffer->fill_size; |
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175 | seq->current_video_data_ptr = seq_buffer->data; |
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176 | seq_buffer->fill_size = 0; |
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177 | } else { |
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178 | seq->current_video_data_size = 0; |
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179 | seq->current_video_data_ptr = 0; |
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180 | } |
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181 | |||
182 | return 0; |
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183 | } |
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184 | |||
185 | static int seq_read_header(AVFormatContext *s) |
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186 | { |
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187 | int i, rc; |
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188 | SeqDemuxContext *seq = s->priv_data; |
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189 | AVIOContext *pb = s->pb; |
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190 | AVStream *st; |
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191 | |||
192 | /* init internal buffers */ |
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193 | rc = seq_init_frame_buffers(seq, pb); |
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194 | if (rc) |
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195 | return rc; |
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196 | |||
197 | seq->current_frame_offs = 0; |
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198 | |||
199 | /* preload (no audio data, just buffer operations related data) */ |
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200 | for (i = 1; i <= 100; i++) { |
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201 | rc = seq_parse_frame_data(seq, pb); |
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202 | if (rc) |
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203 | return rc; |
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204 | } |
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205 | |||
206 | seq->current_frame_pts = 0; |
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207 | |||
208 | seq->audio_buffer_full = 0; |
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209 | |||
210 | /* initialize the video decoder stream */ |
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211 | st = avformat_new_stream(s, NULL); |
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212 | if (!st) |
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213 | return AVERROR(ENOMEM); |
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214 | |||
215 | avpriv_set_pts_info(st, 32, 1, SEQ_FRAME_RATE); |
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216 | seq->video_stream_index = st->index; |
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217 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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218 | st->codec->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO; |
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219 | st->codec->codec_tag = 0; /* no fourcc */ |
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220 | st->codec->width = SEQ_FRAME_W; |
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221 | st->codec->height = SEQ_FRAME_H; |
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222 | |||
223 | /* initialize the audio decoder stream */ |
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224 | st = avformat_new_stream(s, NULL); |
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225 | if (!st) |
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226 | return AVERROR(ENOMEM); |
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227 | |||
228 | st->start_time = 0; |
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229 | avpriv_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE); |
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230 | seq->audio_stream_index = st->index; |
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231 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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232 | st->codec->codec_id = AV_CODEC_ID_PCM_S16BE; |
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233 | st->codec->codec_tag = 0; /* no tag */ |
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234 | st->codec->channels = 1; |
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235 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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236 | st->codec->sample_rate = SEQ_SAMPLE_RATE; |
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237 | st->codec->bits_per_coded_sample = 16; |
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238 | st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels; |
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239 | st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample / 8; |
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240 | |||
241 | return 0; |
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242 | } |
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243 | |||
244 | static int seq_read_packet(AVFormatContext *s, AVPacket *pkt) |
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245 | { |
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246 | int rc; |
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247 | SeqDemuxContext *seq = s->priv_data; |
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248 | AVIOContext *pb = s->pb; |
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249 | |||
250 | if (!seq->audio_buffer_full) { |
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251 | rc = seq_parse_frame_data(seq, pb); |
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252 | if (rc) |
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253 | return rc; |
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254 | |||
255 | /* video packet */ |
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256 | if (seq->current_pal_data_size + seq->current_video_data_size != 0) { |
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257 | if (av_new_packet(pkt, 1 + seq->current_pal_data_size + seq->current_video_data_size)) |
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258 | return AVERROR(ENOMEM); |
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259 | |||
260 | pkt->data[0] = 0; |
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261 | if (seq->current_pal_data_size) { |
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262 | pkt->data[0] |= 1; |
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263 | avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET); |
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264 | if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size) |
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265 | return AVERROR(EIO); |
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266 | } |
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267 | if (seq->current_video_data_size) { |
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268 | pkt->data[0] |= 2; |
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269 | memcpy(&pkt->data[1 + seq->current_pal_data_size], |
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270 | seq->current_video_data_ptr, |
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271 | seq->current_video_data_size); |
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272 | } |
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273 | pkt->stream_index = seq->video_stream_index; |
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274 | pkt->pts = seq->current_frame_pts; |
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275 | |||
276 | /* sound buffer will be processed on next read_packet() call */ |
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277 | seq->audio_buffer_full = 1; |
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278 | return 0; |
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279 | } |
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280 | } |
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281 | |||
282 | /* audio packet */ |
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283 | if (seq->current_audio_data_offs == 0) /* end of data reached */ |
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284 | return AVERROR(EIO); |
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285 | |||
286 | avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET); |
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287 | rc = av_get_packet(pb, pkt, seq->current_audio_data_size); |
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288 | if (rc < 0) |
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289 | return rc; |
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290 | |||
291 | pkt->stream_index = seq->audio_stream_index; |
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292 | seq->current_frame_pts++; |
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293 | |||
294 | seq->audio_buffer_full = 0; |
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295 | return 0; |
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296 | } |
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297 | |||
298 | static int seq_read_close(AVFormatContext *s) |
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299 | { |
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300 | int i; |
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301 | SeqDemuxContext *seq = s->priv_data; |
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302 | |||
303 | for (i = 0; i < SEQ_NUM_FRAME_BUFFERS; i++) |
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304 | av_free(seq->frame_buffers[i].data); |
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305 | |||
306 | return 0; |
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307 | } |
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308 | |||
309 | AVInputFormat ff_tiertexseq_demuxer = { |
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310 | .name = "tiertexseq", |
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311 | .long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ"), |
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312 | .priv_data_size = sizeof(SeqDemuxContext), |
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313 | .read_probe = seq_probe, |
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314 | .read_header = seq_read_header, |
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315 | .read_packet = seq_read_packet, |
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316 | .read_close = seq_read_close, |
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317 | };>>=>>>>>=>>>> |