{"id":454,"date":"2022-01-31T18:51:29","date_gmt":"2022-01-31T10:51:29","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=454"},"modified":"2022-06-11T03:09:02","modified_gmt":"2022-06-10T19:09:02","slug":"ffplay%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-main2","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=454","title":{"rendered":"FFplay\u6e90\u7801\u5206\u6790-main2"},"content":{"rendered":"\n<p>\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d\u5730\u5740\uff1a\u94fe\u63a5\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1VpUvpLhew-nuq4Dns80mOw\">\u767e\u5ea6\u7f51\u76d8<\/a> \u63d0\u53d6\u7801\uff1ag3k8<\/p>\n\n\n\n<p>FFplay \u6e90\u7801\u5206\u6790\u7cfb\u5217\u4ee5\u4e00\u6761\u7b80\u5355\u7684\u547d\u4ee4\u5f00\u59cb\uff0c<code class=\"prettyprint\" >ffplay -i a.mp4<\/code>\u3002a.mp4\u4e0b\u8f7d\u94fe\u63a5\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1RN1xRsQDGx65MGyB_T1IzA\">\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1anl0s \u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u5728 main() \u91cc\u9762\u8c03\u7528 parse_options() \u89e3\u6790\u5b8c\u547d\u4ee4\u884c\u53c2\u6570\u4e4b\u540e\uff0c\u540e\u9762\u8fd8\u67094\u4e2a\u903b\u8f91\u9700\u8981\u6ce8\u610f\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"729\" height=\"434\" src=\".\/wp-content\/uploads\/2022\/01\/ffplay-3-1.png\" alt=\"\" class=\"wp-image-452\"\/><\/figure>\n\n\n\n<p>\u91cd\u70b9\u5df2\u7ecf\u7528\u7ea2\u7b14\u753b\u51fa\u6765\u4e86\u3002<\/p>\n\n\n\n<p>1\uff0cflush_pkt \u53d8\u91cf\u521d\u59cb\u5316\uff0cflush_pkt \u662f\u4e00\u4e2a AVPacket\uff0c\u5b83\u7684data\u4e0d\u662fNULL\uff0c\u6240\u4ee5 flush_pkt \u4e0d\u662f\u7528\u6765\u5237\u89e3\u7801\u5668\u3002\u90a3\u65e2\u7136\u8fd9\u4e2a\u53d8\u91cf\u53ebflush_pkt\uff0c\u5b83\u662fflush\uff0c\u7528\u6765\u5237\u4ec0\u4e48\u7684\u5462\uff1f<\/p>\n\n\n\n<p>\u89e3\u7b54\uff1aflush_pkt \u662f\u7528\u6765\u4e22\u5f03\u7f13\u5b58\u7684packet\u8ddfframe\u7684\uff0cffplay\u7684\u64ad\u653e\u6a21\u5f0f\u4e0d\u662f\u6bcf\u8bfb\u4e00\u5e27\u6570\u636e\u5c31\u64ad\u653e\u4e00\u5e27\uff0c\u800c\u662fffplay\u5f00\u4e862\u4e2a\u7ebf\u7a0b\u5206\u522b\u5904\u7406\u8bfb\u53d6\u6570\u636e\u8ddf\u64ad\u653e\u6570\u636e\uff0c\u8bfb\u53d6\u7ebf\u7a0b\u4f1a\u7ef4\u62a4\u4e24\u4e2a\u961f\u5217\uff0cpacket\u961f\u5217\u8ddfframe\u961f\u5217\uff0c\u8bfb\u53d6\u7ebf\u7a0b\u4e0d\u65ad\u5f80\u8fd9\u4e24\u4e2a\u961f\u5217\u5806\u6570\u636e\uff0c\u76f4\u5230\u8fbe\u5230\u9608\u503c\u3002\u64ad\u653e\u961f\u5217\u4e0d\u65ad\u4eceframe\u961f\u5217\u62ff\u6570\u636e\u51fa\u6765\u4f20\u7ed9SDL\u64ad\u653e\u3002\u8bfb\u53d6\u7ebf\u7a0b\u4e00\u822c\u6765\u8bf4\u662f\u6bd4\u64ad\u653e\u7ebf\u7a0b\u8981\u5feb\u7684\uff0c\u56e0\u4e3a\u89c6\u9891\u7684\u5e27\u7387\u662f1\u79d2\u64ad\u653e24\u5e27\uff0c\u4f46\u662f\u8bfb\u53d6\u7ebf\u7a0b\uff0c1\u79d2\u53ef\u4ee5\u5927\u6982\u89e3\u7801\u51fa100\u591a\u5e27\u5427\u3002\u5047\u5982\u64ad\u653e\u961f\u5217\u7ebf\u7a0b\u64ad\u653e\u5230 00:00:04 \u79d2\uff0c\u4f46\u662f\u8bfb\u53d6\u7ebf\u7a0b\u5df2\u7ecf\u7f13\u5b58\u4e86 00:00:04 ~ 00:00:14 \u79d2\u7684frame\u8ddfpacket\uff0c\u5982\u679c\u8fd9\u5728\u8fd9\u4e2a\u77ac\u95f4\uff0c\u4f60\u62d6\u52a8\u64ad\u653e\u8fdb\u5ea6\u6761\uff0c\u62d6\u5230 00:00:20 \u79d2\u7684\u5730\u65b9\u64ad\u653e\uff0c\u90a3\u4e4b\u524d\u7f13\u5b58\u961f\u5217\u768400:00:04 ~ 00:00:14 \u79d2\u7684frame\u8ddfpacket \u662f\u4e0d\u662f\u5c31\u6ca1\u7528\u4e86\uff0c\u6240\u4ee5\u62d6\u52a8\u8fdb\u5ea6\u6761\u5c31\u4f1a\u4ea7\u751f\u4e00\u4e2a flush_pkt \u4e22\u8fdb\u53bb \u961f\u5217\u91cc\u9762\uff0c\u7136\u540e\u5bfc\u81f4 PacketQueue::serial + 1\uff0c\u961f\u5217\u91cc\u9762\u4f4d\u4e8e flush_pkt \u4e4b\u524d\u7684pakcet\u7684serial\u503c\u8ddf\u4f4d\u4e8e flush_pkt \u4e4b\u524d\u7684pakcet\u7684serial\u503c \u662f\u4e0d\u4e00\u6837\u7684\uff0cffplay \u5c31\u662f\u6839\u636e serial \u51b3\u5b9a\u4e22\u4e0d\u4e22\u5f03 packet\u8ddfframe\u3002\u8bf7\u770b\u4ee5\u4e0b\u90e8\u5206\u4ee3\u7801\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffplay.c\u6587\u4ef6 427\u884c    \nstatic int packet_queue_put_private(PacketQueue *q, AVPacket *pkt)\n{\n    ...\u7701\u7565\u4ee3\u7801....\n    if (pkt == &amp;flush_pkt)\n        q-&gt;serial++; \/\/\u6ce8\u610f\u8fd9\u884c\u4ee3\u7801\n    pkt1-&gt;serial = q-&gt;serial;\n    ...\u7701\u7565\u4ee3\u7801....\n    return 0;\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >ffplay.c\u6587\u4ef6 637\u884c~654\u884c    \n    do {\n        if (d-&gt;queue-&gt;nb_packets == 0)\n            SDL_CondSignal(d-&gt;empty_queue_cond);\n        if (d-&gt;packet_pending) {\n            av_packet_move_ref(&amp;pkt, &amp;d-&gt;pkt);\n            d-&gt;packet_pending = 0;\n        } else {\n            if (packet_queue_get(d-&gt;queue, &amp;pkt, 1, &amp;d-&gt;pkt_serial) &lt; 0)\n                return -1;\n        }\n    } while (d-&gt;queue-&gt;serial != d-&gt;pkt_serial); \/\/\u6ce8\u610f\u8fd9\u884c\u4ee3\u7801\n\n    if (pkt.data == flush_pkt.data) { \/\/\u6ce8\u610f\u8fd9\u884c\u4ee3\u7801\n        avcodec_flush_buffers(d-&gt;avctx);\n        d-&gt;finished = 0;\n        d-&gt;next_pts = d-&gt;start_pts;\n        d-&gt;next_pts_tb = d-&gt;start_pts_tb;\n    } <\/code><\/pre>\n\n\n\n<p>2\uff0c\u4e0a\u9762\u622a\u56fe \uff0c<strong>if (!display_disable) {..}<\/strong> \u88ab\u6211\u7f29\u8fdb\u8d77\u6765\u7684\u662f\u521d\u59cb\u5316 SDL \u7684window\u8ddfrender\uff0c\u7a97\u53e3\u8ddf\u6e32\u67d3\u5668\uff0c\u6bd4\u8f83\u5bb9\u6613\u7406\u89e3\uff0c\u81ea\u5df1\u67e5\u770b\u5c31\u53ef\u61c2\u3002\u4e0d\u8be6\u7ec6\u5206\u6790\u3002<\/p>\n\n\n\n<p>3\uff0c\u7ea2\u8272\u753b\u51fa\u6765\u7684 <strong>streams_open()<\/strong> \u51fd\u6570\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u540e\u7eed\u7684\u597d\u51e0\u4e2a\u7ebf\u7a0b\u90fd\u662f\u4ece\u8fd9\u4e2a\u51fd\u6570\u91cc\u9762\u5f00\u51fa\u6765\u7684\uff0c\u540e\u7eed\u4f1a\u4ed4\u7ec6\u5206\u6790\u8fd9\u4e2a\u51fd\u6570\u3002<\/p>\n\n\n\n<p>4\uff0c\u6700\u540e\u4e00\u4e2a\u7ea2\u8272\u5708\u51fa\u6765\u7684\u662f <strong>event_loop()<\/strong>\uff0c\u770b\u540d\u5b57\u7ffb\u8bd1\u6210\u4e8b\u4ef6\u5904\u7406\uff0c\u5f88\u5bb9\u6613\u8054\u60f3\u5230\u9f20\u6807\u952e\u76d8\u63a7\u5236\u6682\u505c\u64ad\u653e\u4e4b\u7c7b\u7684\uff0c\u4f46\u662f\u4e0d\u8981\u88ab\u8fd9\u4e2a\u540d\u5b57\u8ff7\u60d1\uff0c\u8fd9\u4e2a <strong>event_loop()<\/strong> \u9664\u4e86\u5904\u7406\u952e\u76d8\u9f20\u6807\u4e8b\u4ef6\uff0c\u8fd8\u6709\u4e00\u4e2a\u529f\u80fd\uff0c\u5c31\u662f\u64ad\u653e\u89c6\u9891\u3002event_loop() \u662f\u4e00\u4e2a\u6b7b\u5faa\u73af\uff0c\u56e0\u4e3a\u4e0d\u662f\u6bcf\u65f6\u6bcf\u523b\u90fd\u6709\u952e\u76d8\u4e8b\u4ef6\u9700\u8981\u5904\u7406\uff0c\u5728\u5faa\u73af\u7684\u65f6\u5019\uff0c\u5982\u679c\u6ca1\u6709\u952e\u76d8\u4e8b\u4ef6\u9700\u8981\u5904\u7406\uff0c\u5b83\u5c31\u4f1a\u53bb\u53d6 frame \u961f\u5217\u91cc\u9762\u7684\u89c6\u9891\u5e27\u8fdb\u884c\u64ad\u653e\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u81f3\u6b64\uff0cmain() \u51fd\u6570\u7684\u4e3b\u5e72\u903b\u8f91\u5df2\u7ecf\u5206\u6790\u5b8c\u4e86\uff0c\u91cc\u9762\u7684\u5b50\u51fd\u6570\u903b\u8f91\u540e\u7eed\u6587\u7ae0\u518d\u5206\u6790\uff0c\u73b0\u5728\u7b80\u5355\u505a\u4e2a\u5c0f\u603b\u7ed3\u3002<\/p>\n\n\n\n<p>main() \u51fd\u6570\u4e3b\u8981\u505a\u4e864\u4ef6\u4e8b\u60c5\u3002<\/p>\n\n\n\n<p>1\uff0c\u8c03 <strong>parse_option()<\/strong> \u89e3\u6790\u547d\u4ee4\u884c\u53c2\u6570\u5230\u5168\u5c40\u53d8\u91cf\u3002<\/p>\n\n\n\n<p>2\uff0c\u521d\u59cb\u5316 SDL window \u8ddfrender\u3002<\/p>\n\n\n\n<p>3\uff0c\u8c03\u7528 <strong>stream_open()<\/strong> \u5f00\u542f\u591a\u7ebf\u7a0b\u5904\u7406\uff0c\u8fd9\u91cc\u5148\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\u6709\u591a\u5c11\u4e2a\u7ebf\u7a0b\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>packet\u8bfb\u53d6\u7ebf\u7a0b read_thread()\uff0c\u4e0d\u65ad\u4ece\u6587\u4ef6\u8bfb\u53d6pakcet\uff0c\u7136\u540e\u6839\u636epacket\u7c7b\u578b\uff0c\u4f20\u9012\u5230 \u97f3\u9891pakcet\u961f\u5217\uff0c\u89c6\u9891packet\u961f\u5217\u6216\u5b57\u5e55packet\u961f\u5217\u3002<\/li><li>\u97f3\u9891\u89e3\u7801\u7ebf\u7a0b audio_thread()\uff0c\u4e0d\u65ad\u4ece\u97f3\u9891pakcet\u961f\u5217\u62ff\u5230 packet\uff0c\u7136\u540e\u89e3\u7801\u51faframe\uff0c\u63d2\u8fdb\u53bb \u97f3\u9891frame\u961f\u5217\u3002<\/li><li>\u89c6\u9891\u89e3\u7801\u7ebf\u7a0b video_thread()\uff0c\u4e0d\u65ad\u4ece\u89c6\u9891pakcet\u961f\u5217\u62ff\u5230 packet\uff0c\u7136\u540e\u89e3\u7801\u51faframe\uff0c\u63d2\u8fdb\u53bb \u89c6\u9891frame\u961f\u5217\u3002<\/li><li>\u5b57\u5e55\u89e3\u7801\u7ebf\u7a0b subtitle_thread()\uff0c\u4e0d\u65ad\u4ece\u5b57\u5e55pakcet\u961f\u5217\u62ff\u5230 packet\uff0c\u7136\u540e\u89e3\u7801\u51faframe\uff0c\u63d2\u8fdb\u53bb \u5b57\u5e55frame\u961f\u5217\u3002<\/li><\/ul>\n\n\n\n<p>4\uff0c\u8c03 <strong>event_loop()<\/strong> \u5904\u7406\u952e\u76d8\u4e8b\u4ef6\u8ddf\u4e0d\u65ad\u4ece\u89c6\u9891frame\u961f\u5217 \u62ffframe\u4e22\u7ed9SDL\u64ad\u653e\u3002\u8bfb\u8005\u8bfb\u5230\u8fd9\u91cc\u53ef\u80fd\u4f1a\u7591\u60d1\uff0c\u89c6\u9891frame\u961f\u5217 \u5728 event_loop() \u91cc\u9762\u64ad\u653e\uff0c\u90a3\u97f3\u9891frame\u961f\u5217 \u5728\u54ea\u91cc\u64ad\u653e\uff1f\u89e3\u7b54\uff1a\u97f3\u9891frame\u961f\u5217\u662f\u5728 sdl_audio_callback() \u56de\u8c03\u64ad\u653e\u7684\u3002\u5b57\u5e55\u64ad\u653e\u54b1\u4eec\u4e0d\u5206\u6790\uff0c\u56e0\u4e3a\u4e2a\u4eba\u611f\u89c9ffplay\u7684\u5b57\u5e55\u64ad\u653e\u633a\u4e0d\u5b8c\u5584\u3002<\/p>\n\n\n\n<p>\u662f\u65f6\u5019\u753b\u4e00\u4e2a\u6d41\u7a0b\u56fe\u4fbf\u4e8e\u7406\u89e3 main() \u7684\u4e3b\u5e72\u903b\u8f91\u4e86\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"865\" height=\"540\" src=\".\/wp-content\/uploads\/2022\/01\/ffplay-3-2.png\" alt=\"\" class=\"wp-image-453\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>ffplay \u6e90\u7801\u5206\u6790\uff0cmain()\u5206\u6790\u5b8c\u6bd5\u3002<\/p>\n\n\n\n<p>\u00a9\u7248\u6743\u6240\u5c5e\uff1a\u77e5\u8bc6\u661f\u7403\uff1a\u5f26\u5916\u4e4b\u97f3\uff0cQQ\uff1a2338195090\u3002<\/p>\n\n\n\n<p>\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c 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