{"id":834,"date":"2013-11-06T19:23:00","date_gmt":"2013-11-06T11:23:00","guid":{"rendered":"http:\/\/guoh.ai\/lifelog\/?p=834"},"modified":"2013-11-06T19:32:02","modified_gmt":"2013-11-06T11:32:02","slug":"h-264-inter-prediction","status":"publish","type":"post","link":"https:\/\/guoh.ai\/lifelog\/2013\/11\/h-264-inter-prediction\/","title":{"rendered":"H.264\u9884\u6d4b\u4e4b\u5e27\u95f4\u9884\u6d4b"},"content":{"rendered":"

\u8fd9\u662f\u4e00\u7bc7\u9605\u8bfb\u7b14\u8bb0\uff0c\u76f4\u63a5\u70b9\u51fb\u56fe\u7247\u53ef\u4ee5\u67e5\u770b\u6e05\u6670\u5927\u56fe\u3002<\/p>\n

\u53c2\u8003\u8d44\u6599
\nThe H.264 Advanced Video Compression Standard, Second Edition\uff0c\u4ee5\u4e0b\u7b80\u79f0THAVCS
\nInformation technology – Coding of audio-visual objects – Part 10: Advanced Video Coding\uff0c\u4ee5\u4e0b\u7b80\u79f0SPEC<\/p>\n

CodecVisa
\nJM
\nforeman_part_qcif.264 \u8fd9\u4e2a\u662fforeman_part_qcif.yuv\u901a\u8fc7JM 8.6\u8f6c\u6362\u6765\u7684<\/p>\n

http:\/\/blog.csdn.net\/stpeace\/article\/details\/8115392<\/p>\n

\u5e27\u95f4\u9884\u6d4b\u5c31\u662f\u4ee5\u5df2\u7ecf\u7f16\u7801\u597d\u7684\u5e27(\u5728display order\u4e0a\u53ef\u4ee5\u662f\u5f53\u524d\u5e27\u7684\u524d\u9762\u4e5f\u53ef\u4ee5\u662f\u540e\u9762)\u4f5c\u4e3a\u53c2\u8003\u5e27\uff0c\u786e\u5b9a\u9884\u6d4b\u533a\u57df\uff0c\u751f\u6210\u9884\u6d4b\u5757\uff0c\u8ba1\u7b97\u51fa\u6b98\u5dee\uff0c\u8fd9\u4e9b\u53c2\u8003\u5e27\u90fd\u5b58\u653e\u4e8eDecoded Picture Buffer\u5f53\u4e2d\u3002\u4e0e\u5e27\u5185\u9884\u6d4b\u4e0d\u540c\u7684\u662f\uff0c\u5e27\u95f4\u9884\u6d4b\u662f\u4ee5\u91cd\u5efa\u7684\u5e27\u4e3a\u9884\u6d4b\u5e27\u7684\uff0c\u800c\u5e27\u5185\u9884\u6d4b\u662f\u4e00Loop filter\u4e4b\u524d\u7684\u5e27\u4e3a\u9884\u6d4b\u5e27\u3002\u5f53\u524d\u533a\u5757\u548c\u9884\u6d4b\u533a\u57df\u4e4b\u95f4\u7684\u4f4d\u79fb\u4e3a\u8fd0\u52a8\u5411\u91cf(Motion Vector\uff0c\u7b80\u5199\u4e3aMV)\uff0c\u6bcf\u4e2a\u533a\u5757\u6709\u5404\u81ea\u7684MV\uff0c\u5e76\u4e14MV\u53ef\u4ee5\u662f\u6574\u6570\u7cbe\u5ea6\uff0c\u4e8c\u5206\u4e4b\u4e00\u7cbe\u5ea6\u6216\u8005\u56db\u5206\u4e4b\u4e00\u7cbe\u5ea6(\u5bf9\u4e8e4:2:0\u7684\u89c6\u9891\uff0cC\u662f\u516b\u5206\u4e4b\u4e00\u7cbe\u5ea6)\uff0c\u8fd9\u79cd\u975e\u6574\u6570\u7cbe\u5ea6\u7684\u9884\u6d4b\u533a\u57df\u90fd\u662f\u901a\u8fc7\u63d2\u503c\u7b97\u6cd5\u4ece\u53c2\u8003\u5e27\u5f53\u4e2d\u8ba1\u7b97\u51fa\u6765\u7684\u3002<\/p>\n

\u6ce8\u610f\uff0c\u5728\u5b9e\u9645\u5f53\u4e2dMV\u7684\u5355\u4f4d\u90fd\u662f\u4ee5\u6700\u5c0f\u7684\u7cbe\u5ea6\u4e3a\u5355\u4f4d\u7684\uff0c\u6bd4\u5982Y\u5206\u91cf\u7684MV\u5355\u4f4d\u5c31\u662f\u56db\u5206\u4e4b\u4e00\u7cbe\u5ea6\uff0cC\u5206\u91cf\u7684MV\u5355\u4f4d\u5c31\u662f\u516b\u5206\u4e4b\u4e00\u7cbe\u5ea6\uff0c\u5f53\u7136\u8fd9\u91cc\u8bf4\u7684\u90fd\u662f4:2:0\u7684\u89c6\u9891\u3002<\/strong><\/p>\n

\u4e3b\u8981\u8fc7\u7a0b\u5c31\u662f\u9009\u53d6\u53c2\u8003\u5e27\uff0c\u63d2\u503c\uff0c\u786e\u5b9a\u9884\u6d4b\u533a\u5757\uff0c\u786e\u5b9a\u9884\u6d4b\u7c7b\u578b\uff0c\u786e\u5b9a\u8fd0\u52a8\u5411\u91cf\uff0c\u9884\u6d4b\u8fd0\u52a8\u5411\u91cf\uff0c\u7f16\u7801\u8fd0\u52a8\u5411\u91cf\u5dee\u91cf\u548c\u6b98\u5dee\uff0cdeblocking filter\u3002\u3002\u3002
\n\u8fd9\u91cc\u63d2\u503c\u8ba1\u7b97\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5148\u8ba1\u7b97\u4e8c\u5206\u4e4b\u4e00\uff0c\u518d\u8ba1\u7b97\u56db\u5206\u4e4b\u4e00\uff0c\u53c2\u89c1THAVCS 6.4.2.1 Generating interpolated sub-pixel samples\u3002<\/p>\n

\u6211\u4eec\u6765\u770b\u4e2a\u5b9e\u4f8b\uff0c\u5148\u770bMV\u503c\u4e3a\u6574\u6570\u7684\uff0c\u4e5f\u5c31\u662f\u4e0d\u7528\u63d2\u503c\u7684\u3002<\/p>\n

\u8ddf\u5e27\u5185\u9884\u6d4b\u6240\u7528\u7684\u7801\u6d41\u4e00\u6837\uff0c\u7528CodecVisa\u6253\u5f00\uff0c\u9009\u53d6\u7b2c\u4e8c\u5e27(\u8fd9\u4e2a\u7801\u6d41\u4e00\u5171\u4e09\u5e27\uff0c\u5206\u522b\u4e3aIPP)\uff0c\u9009\u53d6\u7b2c4\u884c\uff0c\u7b2c9\u5217\u7684\u90a3\u4e2aMB\u3002
\n\u770b\u56feinter-prediction-p-slice\uff0c
\n\"inter-prediction-p-slice\"<\/a>
\n\u56e0\u4e3a\u8fd9\u91ccY\u5206\u91cfMV\u5355\u4f4d\u662f\u56db\u5206\u4e4b\u4e00\u7cbe\u5ea6\uff0c\u6240\u4ee5\u5b9e\u9645\u503c\u9664\u4ee54\u5c31\u662f\u50cf\u7d20\u504f\u5dee\u3002\u88ab\u9ad8\u4eae\u7684\u5757\u7684\u503c\u5411\u5de6\u79fb\u52a87\u4e2a\u50cf\u7d20\u5c31\u521a\u521a\u548c\u7b2c\u4e00\u5e27\u5f53\u4e2d\u88ab\u9ad8\u4eae\u4f4d\u7f6e\u7684\u503c\u76f8\u7b49\uff0c\u8fd9\u4e5f\u5c31\u662f\u8bf4\u5f53\u524d\u5757\u662f\u4ee5\u7b2c\u4e00\u5e27\u6240\u793a\u533a\u5757\u4e3a\u9884\u6d4b\u5757\u7684\uff0c\u6ce8\u610f\u5e27\u95f4\u9884\u6d4b\u7684\u53c2\u8003\u5e27\u90fd\u662f\u91cd\u6784\u51fa\u6765\u7684\uff0c\u90fd\u662f\u770bFinal\u503c\uff0c\u548c\u5e27\u5185\u9884\u6d4b\u770bPre-LP\u503c\u4e0d\u4e00\u6837\uff0c\u5982\u56feinter-prediction-reference-picture\uff0c
\n\"inter-prediction-reference-picture\"<\/a>
\n\u8fd9\u662f\u5e27\u95f4\u9884\u6d4b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/p>\n

\u518d\u6765\u770b\u770b\u975e\u6574\u6570\u7cbe\u5ea6\u7684\u60c5\u51b5\uff0cMV\u4e3a(-2.75, -2)\uff0c\u5782\u76f4\u65b9\u5411\u4e0a\u662f\u6574\u6570\uff0c\u6211\u4eec\u4e0d\u7528\u8003\u8651\uff0c\u73b0\u5728\u5c31\u770b\u6c34\u5e73\u65b9\u5411\u4e0a\u3002
\n\"inter-prediction-p-slice-non-integer-pixel\"<\/a>
\n\"inter-prediction-reference-picture-non-integer-pixel\"<\/a>
\n\u5982\u4e0a\u4e24\u5f20\u56fe\u5c31\u5206\u522b\u662f\u5f53\u524d\u5757\u548c\u9884\u6d4b\u5757\uff0c\u56e0\u4e3a\u8fd9\u4e2aMV\u4e0d\u662f\u6574\u6570\u7684\uff0c\u6240\u4ee5\u8981\u5148\u63d2\u503c\u7b97\u51fa\u9884\u6d4b\u5757\uff0c\u6211\u4eec\u628a\u6709\u9700\u8981\u7684\u6570\u636e\u63d0\u53d6\u51fa\u6765\uff0c<\/p>\n

\r\n187    185    187    195 A   199    201    200    200\r\n\r\n187    184    191    198 B   199    201    199    200\r\n\r\n188    183    174    169 C   183    202    198    200\r\n\r\n189    185    166    130 D   132    172    199    202\r\n<\/pre>\n
\u5982\u4e0a\u6570\u636e\u5c31\u662f\u53c2\u8003\u5e27\u91cd\u6784\u540e\u7684\u6570\u636e\uff0cA\uff0cB\uff0cC\u548cD\u5c31\u662f\u6211\u4eec\u8981\u63d2\u503c\u7b97\u51fa\u6765\u7684\u6570\u636e\uff0c\u4e5f\u5c31\u662f\u5f53\u524d\u5757\u7684\u9884\u6d4b\u503c\u3002<\/p>\n
\u5148\u8ba1\u7b97\u4e8c\u5206\u4e4b\u4e00<\/p>\n
\r\nAa = round((1 * 185 - 5 * 187 + 20 * 195 + 20 * 199 - 5 * 201 + 1 * 200) \/ 32) = 198\r\nBb = round((1 * 184 - 5 * 191 + 20 * 198 + 20 * 199 - 5 * 201 + 1 * 199) \/ 32) = 199\r\nCc = round((1 * 183 - 5 * 174 + 20 * 169 + 20 * 183 - 5 * 202 + 1 * 198) \/ 32) = 173\r\nDd = round((1 * 185 - 5 * 166 + 20 * 130 + 20 * 132 - 5 * 172 + 1 * 199) \/ 32) = 123\r\n<\/pre>\n
\u7136\u540e\u56db\u5206\u4e4b\u4e00<\/p>\n
\r\nA = round((198 + 195) \/ 2) = 197\r\nB = round((199 + 198) \/ 2) = 199\r\nC = round((173 + 169) \/ 2) = 171\r\nD = round((123 + 130) \/ 2) = 127\r\n<\/pre>\n
\u7b2c\u4e8c\u5217\u7684\u6570\u636e\uff0c\u65b9\u6cd5\u540c\u6837
\n\u5148\u8ba1\u7b97\u4e8c\u5206\u4e4b\u4e00<\/p>\n
\r\nAa + 1 = round((1 * 187 - 5 * 195 + 20 * 199 + 20 * 201 - 5 * 200 + 1 * 200) \/ 32) = 200\r\nBb + 1 = round((1 * 191 - 5 * 198 + 20 * 199 + 20 * 201 - 5 * 199 + 1 * 200) \/ 32) = 200\r\nCc + 1 = round((1 * 174 - 5 * 169 + 20 * 183 + 20 * 202 - 5 * 198 + 1 * 200) \/ 32) = 195\r\nDd + 1 = round((1 * 166 - 5 * 130 + 20 * 132 + 20 * 172 - 5 * 199 + 1 * 202) \/ 32) = 150\r\n<\/pre>\n
\u7136\u540e\u56db\u5206\u4e4b\u4e00<\/p>\n
\r\nA = round((200 + 199) \/ 2) = 200\r\nB = round((200 + 199) \/ 2) = 200\r\nC = round((195 + 183) \/ 2) = 189\r\nD = round((150 + 132) \/ 2) = 141\r\n<\/pre>\n
\u540e\u9762\u7684\u5c31\u4e0d\u518d\u7f57\u5217\u4e86\uff0c\u4ece\u7ed3\u679c\u6765\u770b\uff0c\u6211\u4eec\u8fd9\u91cc\u9884\u6d4b\u7684\u7ed3\u679c<\/p>\n
\r\n197    200    ....\r\n199    200    ....\r\n171    189    ....\r\n127    141    ....\r\n<\/pre>\n
\u548cCodecVisa\u6709\u4e9b\u8bb8\u51fa\u5165\uff0c\u4f46\u662f\u53d8\u5316\u8d8b\u52bf\u76f8\u540c\u7684\uff0c\u6240\u4ee5\u8fd9\u4e2a\u5b9e\u9a8c\u7684\u57fa\u672c\u76ee\u7684\u8fbe\u5230\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u8fd9\u662f\u4e00\u7bc7\u9605\u8bfb\u7b14\u8bb0\uff0c\u76f4\u63a5\u70b9\u51fb\u56fe\u7247\u53ef\u4ee5\u67e5\u770b\u6e05\u6670\u5927\u56fe\u3002 \u53c2\u8003\u8d44\u6599 The H.264 Advanced Video Compression Standard, Second Edition\uff0c\u4ee5\u4e0b\u7b80\u79f0THAVCS Information technology – Coding of audio-visual objects – Part 10: Advanced Video Coding\uff0c\u4ee5\u4e0b\u7b80\u79f0SPEC CodecVisa JM foreman_part_qcif.264 \u8fd9\u4e2a\u662fforeman_part_qcif.yuv\u901a\u8fc7JM 8.6\u8f6c\u6362\u6765\u7684 http:\/\/blog.csdn.net\/stpeace\/article\/details\/8115392 \u5e27\u95f4\u9884\u6d4b\u5c31\u662f\u4ee5\u5df2\u7ecf\u7f16\u7801\u597d\u7684\u5e27(\u5728display order\u4e0a\u53ef\u4ee5\u662f\u5f53\u524d\u5e27\u7684\u524d\u9762\u4e5f\u53ef\u4ee5\u662f\u540e\u9762)\u4f5c\u4e3a\u53c2\u8003\u5e27\uff0c\u786e\u5b9a\u9884\u6d4b\u533a\u57df\uff0c\u751f\u6210\u9884\u6d4b\u5757\uff0c\u8ba1\u7b97\u51fa\u6b98\u5dee\uff0c\u8fd9\u4e9b\u53c2\u8003\u5e27\u90fd\u5b58\u653e\u4e8eDecoded Picture Buffer\u5f53\u4e2d\u3002\u4e0e\u5e27\u5185\u9884\u6d4b\u4e0d\u540c\u7684\u662f\uff0c\u5e27\u95f4\u9884\u6d4b\u662f\u4ee5\u91cd\u5efa\u7684\u5e27\u4e3a\u9884\u6d4b\u5e27\u7684\uff0c\u800c\u5e27\u5185\u9884\u6d4b\u662f\u4e00Loop filter\u4e4b\u524d\u7684\u5e27\u4e3a\u9884\u6d4b\u5e27\u3002\u5f53\u524d\u533a\u5757\u548c\u9884\u6d4b\u533a\u57df\u4e4b\u95f4\u7684\u4f4d\u79fb\u4e3a\u8fd0\u52a8\u5411\u91cf(Motion Vector\uff0c\u7b80\u5199\u4e3aMV)\uff0c\u6bcf\u4e2a\u533a\u5757\u6709\u5404\u81ea\u7684MV\uff0c\u5e76\u4e14MV\u53ef\u4ee5\u662f\u6574\u6570\u7cbe\u5ea6\uff0c\u4e8c\u5206\u4e4b\u4e00\u7cbe\u5ea6\u6216\u8005\u56db\u5206\u4e4b\u4e00\u7cbe\u5ea6(\u5bf9\u4e8e4:2:0\u7684\u89c6\u9891\uff0cC\u662f\u516b\u5206\u4e4b\u4e00\u7cbe\u5ea6)\uff0c\u8fd9\u79cd\u975e\u6574\u6570\u7cbe\u5ea6\u7684\u9884\u6d4b\u533a\u57df\u90fd\u662f\u901a\u8fc7\u63d2\u503c\u7b97\u6cd5\u4ece\u53c2\u8003\u5e27\u5f53\u4e2d\u8ba1\u7b97\u51fa\u6765\u7684\u3002 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