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4349 | Serge | 1 | /* |
2 | * Electronic Arts CMV Video Decoder |
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3 | * Copyright (c) 2007-2008 Peter Ross |
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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 St, 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 | * Electronic Arts CMV Video Decoder |
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25 | * by Peter Ross (pross@xvid.org) |
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26 | * |
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27 | * Technical details here: |
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28 | * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_CMV |
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29 | */ |
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30 | |||
31 | #include "libavutil/common.h" |
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32 | #include "libavutil/intreadwrite.h" |
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33 | #include "libavutil/imgutils.h" |
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34 | #include "avcodec.h" |
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35 | #include "internal.h" |
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36 | |||
37 | typedef struct CmvContext { |
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38 | AVCodecContext *avctx; |
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39 | AVFrame *last_frame; ///< last |
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40 | AVFrame *last2_frame; ///< second-last |
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41 | int width, height; |
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42 | unsigned int palette[AVPALETTE_COUNT]; |
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43 | } CmvContext; |
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44 | |||
45 | static av_cold int cmv_decode_init(AVCodecContext *avctx){ |
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46 | CmvContext *s = avctx->priv_data; |
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47 | |||
48 | s->avctx = avctx; |
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49 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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50 | |||
51 | s->last_frame = av_frame_alloc(); |
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52 | s->last2_frame = av_frame_alloc(); |
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53 | if (!s->last_frame || !s->last2_frame) { |
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54 | av_frame_free(&s->last_frame); |
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55 | av_frame_free(&s->last2_frame); |
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56 | return AVERROR(ENOMEM); |
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57 | } |
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58 | |||
59 | return 0; |
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60 | } |
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61 | |||
62 | static void cmv_decode_intra(CmvContext * s, AVFrame *frame, |
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63 | const uint8_t *buf, const uint8_t *buf_end) |
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64 | { |
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65 | unsigned char *dst = frame->data[0]; |
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66 | int i; |
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67 | |||
68 | for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) { |
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69 | memcpy(dst, buf, s->avctx->width); |
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70 | dst += frame->linesize[0]; |
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71 | buf += s->avctx->width; |
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72 | } |
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73 | } |
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74 | |||
75 | static void cmv_motcomp(unsigned char *dst, int dst_stride, |
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76 | const unsigned char *src, int src_stride, |
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77 | int x, int y, |
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78 | int xoffset, int yoffset, |
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79 | int width, int height){ |
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80 | int i,j; |
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81 | |||
82 | for(j=y;j |
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83 | for(i=x;i |
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84 | { |
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85 | if (i+xoffset>=0 && i+xoffset |
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86 | j+yoffset>=0 && j+yoffset |
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87 | dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset]; |
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88 | }else{ |
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89 | dst[j*dst_stride + i] = 0; |
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90 | } |
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91 | } |
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92 | } |
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93 | |||
94 | static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf, |
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95 | const uint8_t *buf_end) |
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96 | { |
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97 | const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16); |
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98 | int x,y,i; |
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99 | |||
100 | i = 0; |
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101 | for(y=0; y |
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102 | for(x=0; x |
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103 | if (buf[i]==0xFF) { |
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104 | unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4; |
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105 | if (raw+16 |
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106 | raw++; |
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107 | memcpy(dst, raw, 4); |
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108 | memcpy(dst + frame->linesize[0], raw+4, 4); |
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109 | memcpy(dst + 2 * frame->linesize[0], raw+8, 4); |
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110 | memcpy(dst + 3 * frame->linesize[0], raw+12, 4); |
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111 | raw+=16; |
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112 | }else if(raw |
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113 | int xoffset = (*raw & 0xF) - 7; |
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114 | int yoffset = ((*raw >> 4)) - 7; |
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115 | if (s->last2_frame->data[0]) |
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116 | cmv_motcomp(frame->data[0], frame->linesize[0], |
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117 | s->last2_frame->data[0], s->last2_frame->linesize[0], |
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118 | x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height); |
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119 | raw++; |
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120 | } |
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121 | }else{ /* inter using last frame as reference */ |
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122 | int xoffset = (buf[i] & 0xF) - 7; |
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123 | int yoffset = ((buf[i] >> 4)) - 7; |
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124 | if (s->last_frame->data[0]) |
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125 | cmv_motcomp(frame->data[0], frame->linesize[0], |
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126 | s->last_frame->data[0], s->last_frame->linesize[0], |
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127 | x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height); |
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128 | } |
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129 | i++; |
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130 | } |
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131 | } |
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132 | |||
133 | static void cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end) |
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134 | { |
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135 | int pal_start, pal_count, i; |
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136 | |||
137 | if(buf_end - buf < 16) { |
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138 | av_log(s->avctx, AV_LOG_WARNING, "truncated header\n"); |
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139 | return; |
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140 | } |
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141 | |||
142 | s->width = AV_RL16(&buf[4]); |
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143 | s->height = AV_RL16(&buf[6]); |
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144 | if (s->avctx->width!=s->width || s->avctx->height!=s->height) { |
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145 | avcodec_set_dimensions(s->avctx, s->width, s->height); |
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146 | av_frame_unref(s->last_frame); |
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147 | av_frame_unref(s->last2_frame); |
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148 | } |
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149 | |||
150 | s->avctx->time_base.num = 1; |
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151 | s->avctx->time_base.den = AV_RL16(&buf[10]); |
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152 | |||
153 | pal_start = AV_RL16(&buf[12]); |
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154 | pal_count = AV_RL16(&buf[14]); |
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155 | |||
156 | buf += 16; |
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157 | for (i=pal_start; i |
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158 | s->palette[i] = 0xFFU << 24 | AV_RB24(buf); |
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159 | buf += 3; |
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160 | } |
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161 | } |
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162 | |||
163 | #define EA_PREAMBLE_SIZE 8 |
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164 | #define MVIh_TAG MKTAG('M', 'V', 'I', 'h') |
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165 | |||
166 | static int cmv_decode_frame(AVCodecContext *avctx, |
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167 | void *data, int *got_frame, |
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168 | AVPacket *avpkt) |
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169 | { |
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170 | const uint8_t *buf = avpkt->data; |
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171 | int buf_size = avpkt->size; |
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172 | CmvContext *s = avctx->priv_data; |
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173 | const uint8_t *buf_end = buf + buf_size; |
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174 | AVFrame *frame = data; |
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175 | int ret; |
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176 | |||
177 | if (buf_end - buf < EA_PREAMBLE_SIZE) |
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178 | return AVERROR_INVALIDDATA; |
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179 | |||
180 | if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) { |
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181 | unsigned size = AV_RL32(buf + 4); |
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182 | cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end); |
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183 | if (size > buf_end - buf - EA_PREAMBLE_SIZE) |
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184 | return -1; |
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185 | buf += size; |
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186 | } |
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187 | |||
188 | if (av_image_check_size(s->width, s->height, 0, s->avctx)) |
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189 | return -1; |
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190 | |||
191 | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
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192 | return ret; |
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193 | |||
194 | memcpy(frame->data[1], s->palette, AVPALETTE_SIZE); |
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195 | |||
196 | buf += EA_PREAMBLE_SIZE; |
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197 | if ((buf[0]&1)) { // subtype |
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198 | cmv_decode_inter(s, frame, buf+2, buf_end); |
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199 | frame->key_frame = 0; |
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200 | frame->pict_type = AV_PICTURE_TYPE_P; |
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201 | }else{ |
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202 | frame->key_frame = 1; |
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203 | frame->pict_type = AV_PICTURE_TYPE_I; |
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204 | cmv_decode_intra(s, frame, buf+2, buf_end); |
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205 | } |
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206 | |||
207 | av_frame_unref(s->last2_frame); |
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208 | av_frame_move_ref(s->last2_frame, s->last_frame); |
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209 | if ((ret = av_frame_ref(s->last_frame, frame)) < 0) |
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210 | return ret; |
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211 | |||
212 | *got_frame = 1; |
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213 | |||
214 | return buf_size; |
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215 | } |
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216 | |||
217 | static av_cold int cmv_decode_end(AVCodecContext *avctx){ |
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218 | CmvContext *s = avctx->priv_data; |
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219 | |||
220 | av_frame_free(&s->last_frame); |
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221 | av_frame_free(&s->last2_frame); |
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222 | |||
223 | return 0; |
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224 | } |
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225 | |||
226 | AVCodec ff_eacmv_decoder = { |
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227 | .name = "eacmv", |
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228 | .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"), |
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229 | .type = AVMEDIA_TYPE_VIDEO, |
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230 | .id = AV_CODEC_ID_CMV, |
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231 | .priv_data_size = sizeof(CmvContext), |
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232 | .init = cmv_decode_init, |
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233 | .close = cmv_decode_end, |
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234 | .decode = cmv_decode_frame, |
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235 | .capabilities = CODEC_CAP_DR1, |
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236 | };>>>><>> |