{"id":520,"date":"2025-06-25T14:22:11","date_gmt":"2025-06-25T06:22:11","guid":{"rendered":"https:\/\/trantor.ink\/?p=520"},"modified":"2025-06-25T14:22:12","modified_gmt":"2025-06-25T06:22:12","slug":"%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90%ef%bc%9aandroid-media3-exoplayer-%e9%9f%b3%e9%a2%91%e6%92%ad%e6%94%be%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/trantor.ink\/?p=520","title":{"rendered":"\u6df1\u5ea6\u89e3\u6790\uff1aAndroid Media3 ExoPlayer \u97f3\u9891\u64ad\u653e\u5de5\u4f5c\u539f\u7406"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/trantor.ink\/?p=520\/#%E5%BC%95%E8%A8%80%EF%BC%9AExoPlayer_%E7%9A%84%E6%9E%B6%E6%9E%84%E5%93%B2%E5%AD%A6\" >\u5f15\u8a00\uff1aExoPlayer \u7684\u67b6\u6784\u54f2\u5b66<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/trantor.ink\/?p=520\/#%E7%AC%AC%E4%B8%80%E8%8A%82_%E7%AB%AF%E5%88%B0%E7%AB%AF%E7%9A%84%E9%9F%B3%E9%A2%91%E6%95%B0%E6%8D%AE%E6%B5%81\" >\u7b2c\u4e00\u8282 \u7aef\u5230\u7aef\u7684\u97f3\u9891\u6570\u636e\u6d41<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/trantor.ink\/?p=520\/#%E7%AC%AC%E4%BA%8C%E8%8A%82_%E9%9F%B3%E9%A2%91%E8%A7%A3%E5%B0%81%E8%A3%85%EF%BC%9A%E6%8B%86%E8%A7%A3%E5%AA%92%E4%BD%93%E5%AE%B9%E5%99%A8\" >\u7b2c\u4e8c\u8282 \u97f3\u9891\u89e3\u5c01\u88c5\uff1a\u62c6\u89e3\u5a92\u4f53\u5bb9\u5668<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/trantor.ink\/?p=520\/#%E4%BB%8E_MediaItem_%E5%88%B0_MediaSource\" >\u4ece MediaItem \u5230 MediaSource<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/trantor.ink\/?p=520\/#Extractor_%E7%9A%84%E8%A7%92%E8%89%B2\" >Extractor \u7684\u89d2\u8272<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/trantor.ink\/?p=520\/#%E9%92%88%E5%AF%B9%E8%87%AA%E9%80%82%E5%BA%94%E6%B5%81%E7%9A%84%E7%89%B9%E5%8C%96_MediaSource\" >\u9488\u5bf9\u81ea\u9002\u5e94\u6d41\u7684\u7279\u5316 MediaSource<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/trantor.ink\/?p=520\/#%E9%85%8D%E7%BD%AE%E5%AE%9E%E4%BE%8B%EF%BC%9A%E6%81%92%E5%AE%9A%E6%AF%94%E7%89%B9%E7%8E%87%E6%90%9C%E7%B4%A2\" >\u914d\u7f6e\u5b9e\u4f8b\uff1a\u6052\u5b9a\u6bd4\u7279\u7387\u641c\u7d22<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/trantor.ink\/?p=520\/#%E7%AC%AC%E4%B8%89%E8%8A%82_%E8%A7%A3%E7%A0%81%E5%99%A8%E9%80%89%E6%8B%A9%EF%BC%9A%E7%BC%96%E8%A7%A3%E7%A0%81%E7%AE%A1%E7%90%86%E7%9A%84%E6%99%BA%E6%85%A7%E6%A0%B8%E5%BF%83\" >\u7b2c\u4e09\u8282 \u89e3\u7801\u5668\u9009\u62e9\uff1a\u7f16\u89e3\u7801\u7ba1\u7406\u7684\u667a\u6167\u6838\u5fc3<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/trantor.ink\/?p=520\/#%E7%AC%AC%E4%B8%80%E9%98%B6%E6%AE%B5%EF%BC%9ATrackSelector_%E7%9A%84%E8%BD%A8%E9%81%93%E9%80%89%E6%8B%A9\" >\u7b2c\u4e00\u9636\u6bb5\uff1aTrackSelector \u7684\u8f68\u9053\u9009\u62e9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/trantor.ink\/?p=520\/#%E7%AC%AC%E4%BA%8C%E9%98%B6%E6%AE%B5%EF%BC%9AMediaCodecSelector_%E7%9A%84%E8%A7%A3%E7%A0%81%E5%99%A8%E9%80%89%E6%8B%A9\" >\u7b2c\u4e8c\u9636\u6bb5\uff1aMediaCodecSelector \u7684\u89e3\u7801\u5668\u9009\u62e9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/trantor.ink\/?p=520\/#%E5%AE%9A%E5%88%B6%E5%8C%96%E4%B8%8E%E5%9B%9E%E9%80%80%E6%9C%BA%E5%88%B6\" >\u5b9a\u5236\u5316\u4e0e\u56de\u9000\u673a\u5236<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/trantor.ink\/?p=520\/#%E7%AC%AC%E5%9B%9B%E8%8A%82_%E9%9F%B3%E9%A2%91%E8%A7%A3%E7%A0%81%EF%BC%9A%E4%BB%8E%E5%8E%8B%E7%BC%A9%E6%95%B0%E6%8D%AE%E5%88%B0%E5%8E%9F%E5%A7%8B_PCM\" >\u7b2c\u56db\u8282 \u97f3\u9891\u89e3\u7801\uff1a\u4ece\u538b\u7f29\u6570\u636e\u5230\u539f\u59cb PCM<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/trantor.ink\/?p=520\/#MediaCodecAudioRenderer_%E7%9A%84%E6%A0%B8%E5%BF%83%E8%81%8C%E8%B4%A3\" >MediaCodecAudioRenderer \u7684\u6838\u5fc3\u804c\u8d23<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/trantor.ink\/?p=520\/#%E8%A7%A3%E7%A0%81%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F\" >\u89e3\u7801\u751f\u547d\u5468\u671f<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/trantor.ink\/?p=520\/#%E7%AC%AC%E4%BA%94%E8%8A%82_%E9%9F%B3%E9%A2%91%E6%B8%B2%E6%9F%93%E4%B8%8E%E5%A4%84%E7%90%86%EF%BC%9A%E9%80%9A%E5%BE%80%E6%89%AC%E5%A3%B0%E5%99%A8%E7%9A%84%E6%9C%80%E5%90%8E%E6%97%85%E7%A8%8B\" >\u7b2c\u4e94\u8282 \u97f3\u9891\u6e32\u67d3\u4e0e\u5904\u7406\uff1a\u901a\u5f80\u626c\u58f0\u5668\u7684\u6700\u540e\u65c5\u7a0b<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/trantor.ink\/?p=520\/#AudioSink_%E6%8E%A5%E5%8F%A3%EF%BC%9A%E9%9F%B3%E9%A2%91%E6%95%B0%E6%8D%AE%E7%9A%84%E7%BB%88%E7%82%B9\" >AudioSink \u63a5\u53e3\uff1a\u97f3\u9891\u6570\u636e\u7684\u7ec8\u70b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/trantor.ink\/?p=520\/#%E6%A0%B8%E5%BF%83%E7%B1%BB%EF%BC%9ADefaultAudioSink\" >\u6838\u5fc3\u7c7b\uff1aDefaultAudioSink<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/trantor.ink\/?p=520\/#%E6%A0%B8%E5%BF%83%E7%B1%BB%EF%BC%9AAudioProcessor\" >\u6838\u5fc3\u7c7b\uff1aAudioProcessor<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/trantor.ink\/?p=520\/#%E6%A0%B8%E5%BF%83%E7%B1%BB%EF%BC%9ADefaultAudioSinkBuilder\" >\u6838\u5fc3\u7c7b\uff1aDefaultAudioSink.Builder<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/trantor.ink\/?p=520\/#%E7%AC%AC%E5%85%AD%E8%8A%82_%E7%BB%93%E8%AE%BA%EF%BC%9A%E6%9E%B6%E6%9E%84%E6%95%B4%E5%90%88%E4%B8%8E%E5%AE%9E%E8%B7%B5%E5%BB%BA%E8%AE%AE\" >\u7b2c\u516d\u8282 \u7ed3\u8bba\uff1a\u67b6\u6784\u6574\u5408\u4e0e\u5b9e\u8df5\u5efa\u8bae<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/trantor.ink\/?p=520\/#%E7%AE%A1%E9%81%93%E6%80%BB%E7%BB%93\" >\u7ba1\u9053\u603b\u7ed3<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/trantor.ink\/?p=520\/#%E5%AE%9E%E7%94%A8%E8%B0%83%E8%AF%95%E7%AD%96%E7%95%A5\" >\u5b9e\u7528\u8c03\u8bd5\u7b56\u7565<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%BC%95%E8%A8%80%EF%BC%9AExoPlayer_%E7%9A%84%E6%9E%B6%E6%9E%84%E5%93%B2%E5%AD%A6\"><\/span>\u5f15\u8a00\uff1aExoPlayer \u7684\u67b6\u6784\u54f2\u5b66<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">ExoPlayer \u5e76\u975e\u4e00\u4e2a\u5355\u4e00\u529f\u80fd\u7684\u64ad\u653e\u5668\uff0c\u800c\u662f\u4e00\u4e2a\u9ad8\u5ea6\u6a21\u5757\u5316\u548c\u53ef\u6269\u5c55\u7684\u5a92\u4f53\u64ad\u653e\u6846\u67b6 <sup>1<\/sup>\u3002\u8fd9\u662f\u5176\u4e0e\u4f20\u7edf\u7684<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>MediaPlayer<\/code> API \u76f8\u6bd4\u6700\u6838\u5fc3\u7684\u533a\u522b <sup>2<\/sup>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>ExoPlayer<\/code> \u6838\u5fc3\u7c7b\u8d1f\u8d23\u7ba1\u7406\u64ad\u653e\u5668\u7684\u5168\u5c40\u72b6\u6001\uff0c\u4f46\u5c06\u5a92\u4f53\u52a0\u8f7d\u3001\u7f13\u51b2\u548c\u6e32\u67d3\u7b49\u5b9e\u9645\u5de5\u4f5c\u59d4\u6258\u7ed9\u5728\u521b\u5efa\u64ad\u653e\u5668\u65f6\u6ce8\u5165\u7684\u7ec4\u4ef6\uff0c\u4f8b\u5982 <code>MediaSource<\/code>\u3001<code>Renderer<\/code>\u3001<code>TrackSelector<\/code> \u548c <code>LoadControl<\/code> <sup>1<\/sup>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 Media3 \u7684\u751f\u6001\u4e2d\uff0cExoPlayer \u662f <code>Player<\/code> \u63a5\u53e3\u7684\u9ed8\u8ba4\u5b9e\u73b0\u3002Media3 \u662f\u4e00\u4e2a\u7edf\u4e00\u7684\u5a92\u4f53\u5e93\uff0c\u65e8\u5728\u6db5\u76d6\u6240\u6709\u5a92\u4f53\u7528\u4f8b\uff0c\u5305\u62ec\u64ad\u653e\u548c\u7f16\u8f91 <sup>6<\/sup>\u3002\u8fd9\u4f7f\u5f97 ExoPlayer \u6210\u4e3a\u73b0\u4ee3 Android \u5a92\u4f53\u6280\u672f\u6808\u7684\u57fa\u7840\u7ec4\u4ef6\uff0c\u5e76\u5b9e\u73b0\u4e86\u64ad\u653e\uff08<code>ExoPlayer<\/code>\uff09\u548c\u7f16\u8f91\uff08<code>Transformer<\/code>\uff09\u529f\u80fd\u4e4b\u95f4\u7684\u4e92\u64cd\u4f5c\u6027 <sup>8<\/sup>\u3002\u672c\u62a5\u544a\u5c06\u6df1\u5165\u5256\u6790\u97f3\u9891\u6d41\u5728 ExoPlayer \u7ba1\u9053\u4e2d\u7684\u5b8c\u6574\u751f\u547d\u5468\u671f\uff0c\u63ed\u793a\u5176\u4ece\u5a92\u4f53\u6e90\u5230\u626c\u58f0\u5668\u7684\u6bcf\u4e00\u6b65\u6280\u672f\u7ec6\u8282\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E4%B8%80%E8%8A%82_%E7%AB%AF%E5%88%B0%E7%AB%AF%E7%9A%84%E9%9F%B3%E9%A2%91%E6%95%B0%E6%8D%AE%E6%B5%81\"><\/span>\u7b2c\u4e00\u8282 \u7aef\u5230\u7aef\u7684\u97f3\u9891\u6570\u636e\u6d41<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u6982\u5ff5\u4e0a\u8bb2\uff0cExoPlayer \u4e2d\u7684\u97f3\u9891\u6570\u636e\u6d41\u9075\u5faa\u4e00\u4e2a\u6e05\u6670\u4e14\u903b\u8f91\u6027\u5f3a\u7684\u8def\u5f84\u3002\u6574\u4e2a\u8fc7\u7a0b\u59cb\u4e8e\u4e00\u4e2a\u4ee3\u8868\u5f85\u64ad\u653e\u5a92\u4f53\u7684 <code>MediaItem<\/code> \u5bf9\u8c61\u3002\u8be5\u5bf9\u8c61\u901a\u8fc7 <code>MediaSource.Factory<\/code> \u88ab\u8f6c\u6362\u6210\u4e00\u4e2a <code>MediaSource<\/code>\u3002<code>MediaSource<\/code> \u8d1f\u8d23\u52a0\u8f7d\u5a92\u4f53\u6570\u636e\uff0c\u5e76\u5229\u7528 <code>Extractor<\/code> \u5c06\u97f3\u9891\u6d41\u4ece\u5a92\u4f53\u5bb9\u5668\u4e2d\u5206\u79bb\u51fa\u6765\u3002\u968f\u540e\uff0c<code>MediaCodecAudioRenderer<\/code> \u63a5\u7ba1\u6570\u636e\uff0c\u5b83\u901a\u8fc7 <code>MediaCodecSelector<\/code> \u9009\u62e9\u4e00\u4e2a\u5408\u9002\u7684 <code>MediaCodec<\/code>\uff08\u89e3\u7801\u5668\uff09\uff0c\u5c06\u538b\u7f29\u7684\u97f3\u9891\u6570\u636e\u89e3\u7801\u4e3a\u539f\u59cb\u7684 PCM\uff08\u8109\u51b2\u7f16\u7801\u8c03\u5236\uff09\u6570\u636e\u3002\u8fd9\u4e9b PCM \u6570\u636e\u5728\u9001\u5f80\u6700\u7ec8\u6e32\u67d3\u9636\u6bb5\u4e4b\u524d\uff0c\u53ef\u4ee5\u6d41\u7ecf\u4e00\u4e2a <code>AudioProcessor<\/code> \u94fe\uff0c\u8fdb\u884c\u5b9e\u65f6\u97f3\u6548\u5904\u7406\u3002\u6700\u540e\uff0c<code>AudioSink<\/code> \u7ec4\u4ef6\u6d88\u8d39 PCM \u6570\u636e\uff0c\u5e76\u901a\u8fc7\u5e95\u5c42\u7684 <code>AudioTrack<\/code> API \u5c06\u58f0\u97f3\u8f93\u51fa\u5230\u8bbe\u5907\u786c\u4ef6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u6e05\u6670\u5730\u5c55\u793a\u5404\u4e2a\u7ec4\u4ef6\u5728\u8fd9\u4e00\u6d41\u7a0b\u4e2d\u7684\u89d2\u8272\uff0c\u4e0b\u8868\u63d0\u4f9b\u4e86 ExoPlayer \u97f3\u9891\u7ba1\u9053\u4e2d\u6838\u5fc3\u7ec4\u4ef6\u7684\u5feb\u901f\u53c2\u8003\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8868 1.1: ExoPlayer \u97f3\u9891\u7ba1\u9053\u5173\u952e\u7ec4\u4ef6<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td>\u7ec4\u4ef6\/\u7c7b<\/td><td>\u7ba1\u9053\u9636\u6bb5<\/td><td>\u4e3b\u8981\u529f\u80fd<\/td><\/tr><\/thead><tbody><tr><td><code>MediaItem<\/code><\/td><td>\u6570\u636e\u6e90<\/td><td>\u63cf\u8ff0\u5f85\u64ad\u653e\u7684\u5a92\u4f53\uff0c\u901a\u5e38\u5305\u542b\u4e00\u4e2a URI <sup>9<\/sup>\u3002<\/td><\/tr><tr><td><code>MediaSource<\/code><\/td><td>\u6570\u636e\u6e90\u52a0\u8f7d<\/td><td>\u8d1f\u8d23\u52a0\u8f7d\u5a92\u4f53\u6570\u636e\uff0c\u5e76\u4ece\u4e2d\u8bfb\u53d6\u5a92\u4f53\u6d41 <sup>1<\/sup>\u3002<\/td><\/tr><tr><td><code>Extractor<\/code><\/td><td>\u89e3\u5c01\u88c5<\/td><td>\u4ece\u5a92\u4f53\u5bb9\u5668\u683c\u5f0f\uff08\u5982 MP4, MP3\uff09\u4e2d\u63d0\u53d6\u5355\u4e2a\u7684\u97f3\u9891\u548c\u89c6\u9891\u57fa\u672c\u6d41 <sup>11<\/sup>\u3002<\/td><\/tr><tr><td><code>TrackSelector<\/code><\/td><td>\u8f68\u9053\u9009\u62e9<\/td><td>\u6839\u636e\u8bbe\u5b9a\u7684\u53c2\u6570\uff08\u5982\u8bed\u8a00\u3001\u5206\u8fa8\u7387\uff09\u4ece\u6240\u6709\u53ef\u7528\u8f68\u9053\u4e2d\u9009\u62e9\u8981\u64ad\u653e\u7684\u8f68\u9053 <sup>13<\/sup>\u3002<\/td><\/tr><tr><td><code>MediaCodecSelector<\/code><\/td><td>\u89e3\u7801\u5668\u9009\u62e9<\/td><td>\u4e3a\u7ed9\u5b9a\u7684\u5a92\u4f53\u683c\u5f0f\u9009\u62e9\u4e00\u4e2a\u5408\u9002\u7684 <code>MediaCodec<\/code> \u89e3\u7801\u5668 <sup>14<\/sup>\u3002<\/td><\/tr><tr><td><code>MediaCodecAudioRenderer<\/code><\/td><td>\u89e3\u7801<\/td><td>\u4f7f\u7528 <code>MediaCodec<\/code> \u5c06\u538b\u7f29\u7684\u97f3\u9891\u6d41\u89e3\u7801\u4e3a\u539f\u59cb\u7684 PCM \u97f3\u9891\u6570\u636e <sup>16<\/sup>\u3002<\/td><\/tr><tr><td><code>AudioProcessor<\/code><\/td><td>\u97f3\u9891\u5904\u7406<\/td><td>\u5728\u89e3\u7801\u540e\u3001\u6e32\u67d3\u524d\u5bf9\u539f\u59cb PCM \u6570\u636e\u8fdb\u884c\u5b9e\u65f6\u5904\u7406\uff0c\u5982\u5747\u8861\u5668\u3001\u97f3\u91cf\u8c03\u8282\u7b49 <sup>18<\/sup>\u3002<\/td><\/tr><tr><td><code>AudioSink<\/code><\/td><td>\u97f3\u9891\u6e32\u67d3<\/td><td>\u6d88\u8d39 PCM \u97f3\u9891\u6570\u636e\uff0c\u5e76\u7ba1\u7406\u5e95\u5c42\u7684 <code>AudioTrack<\/code> \u5b9e\u4f8b\u8fdb\u884c\u64ad\u653e <sup>20<\/sup>\u3002<\/td><\/tr><tr><td><code>AudioTrack<\/code><\/td><td>\u786c\u4ef6\u8f93\u51fa<\/td><td>Android \u7cfb\u7edf\u63d0\u4f9b\u7684\u5e95\u5c42 API\uff0c\u7528\u4e8e\u5c06 PCM \u97f3\u9891\u6570\u636e\u6d41\u5199\u5165\u97f3\u9891\u786c\u4ef6\u8fdb\u884c\u64ad\u653e <sup>4<\/sup>\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E4%BA%8C%E8%8A%82_%E9%9F%B3%E9%A2%91%E8%A7%A3%E5%B0%81%E8%A3%85%EF%BC%9A%E6%8B%86%E8%A7%A3%E5%AA%92%E4%BD%93%E5%AE%B9%E5%99%A8\"><\/span>\u7b2c\u4e8c\u8282 \u97f3\u9891\u89e3\u5c01\u88c5\uff1a\u62c6\u89e3\u5a92\u4f53\u5bb9\u5668<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u97f3\u9891\u64ad\u653e\u7684\u7b2c\u4e00\u6b65\u662f\u4ece\u5a92\u4f53\u6587\u4ef6\u4e2d\u63d0\u53d6\u51fa\u7eaf\u51c0\u7684\u97f3\u9891\u6570\u636e\u6d41\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u79f0\u4e3a\u89e3\u5c01\u88c5\uff08Demuxing\uff09\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BB%8E_MediaItem_%E5%88%B0_MediaSource\"><\/span>\u4ece <code>MediaItem<\/code> \u5230 <code>MediaSource<\/code><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6574\u4e2a\u64ad\u653e\u6d41\u7a0b\u59cb\u4e8e\u4e00\u4e2a <code>MediaItem<\/code> \u5bf9\u8c61\uff0c\u5b83\u662f\u5bf9\u8981\u64ad\u653e\u5a92\u4f53\u7684\u7b80\u5355\u63cf\u8ff0\uff0c\u901a\u5e38\u5305\u542b\u4e00\u4e2a URI <sup>9<\/sup>\u3002\u5f53\u5f00\u53d1\u8005\u8c03\u7528<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>player.setMediaItem(mediaItem)<\/code> \u65f6\uff0c<code>ExoPlayer<\/code> \u5b9e\u4f8b\u5185\u90e8\u4f1a\u4f7f\u7528\u4e00\u4e2a\u6ce8\u5165\u7684 <code>MediaSource.Factory<\/code> \u5c06\u8fd9\u4e2a <code>MediaItem<\/code> \u8f6c\u6362\u4e3a\u4e00\u4e2a <code>MediaSource<\/code> <sup>1<\/sup>\u3002\u8fd9\u79cd\u5de5\u5382\u6a21\u5f0f\u662f ExoPlayer \u7075\u6d3b\u6027\u7684\u57fa\u77f3\uff0c\u5b83\u5c06\u5a92\u4f53\u7684\u8868\u793a\uff08<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>MediaItem<\/code>\uff09\u4e0e\u5a92\u4f53\u7684\u52a0\u8f7d\u548c\u89e3\u6790\u903b\u8f91\uff08<code>MediaSource<\/code>\uff09\u89e3\u8026\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Extractor_%E7%9A%84%E8%A7%92%E8%89%B2\"><\/span><code>Extractor<\/code> \u7684\u89d2\u8272<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u672c\u5730\u6587\u4ef6\u6216\u6807\u51c6\u7684\u7f51\u7edc\u6d41\uff08\u5373\u6e10\u8fdb\u5f0f\u4e0b\u8f7d\uff09\uff0cExoPlayer \u901a\u5e38\u4f7f\u7528 <code>ProgressiveMediaSource<\/code>\u3002\u8fd9\u4e2a <code>MediaSource<\/code> \u7684\u6838\u5fc3\u4efb\u52a1\u662f\u52a0\u8f7d\u5a92\u4f53\u6570\u636e\uff0c\u5e76\u5229\u7528\u4e00\u4e2a <code>Extractor<\/code> \u5b9e\u4f8b\u6765\u89e3\u6790\u5a92\u4f53\u5bb9\u5668\u683c\u5f0f\uff08\u5982 MP4, M4A, MP3, FLAC\uff09\uff0c\u8fdb\u800c\u66b4\u9732\u51fa\u5176\u4e2d\u5305\u542b\u7684\u5355\u4e2a\u97f3\u9891\u3001\u89c6\u9891\u6216\u6587\u672c\u8f68\u9053 <sup>11<\/sup>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>ExoPlayer<\/code> \u63d0\u4f9b\u4e86\u4e00\u4e2a <code>DefaultExtractorsFactory<\/code>\uff0c\u5b83\u5305\u542b\u4e86\u5bf9\u6240\u6709\u5e38\u89c1\u5bb9\u5668\u683c\u5f0f\u7684 <code>Extractor<\/code> \u5b9e\u73b0 <sup>11<\/sup>\u3002\u5f00\u53d1\u8005\u53ef\u4ee5\u5b9a\u5236\u8fd9\u4e2a\u5de5\u5382\uff0c\u4ee5\u6dfb\u52a0\u5bf9\u81ea\u5b9a\u4e49\u683c\u5f0f\u7684\u652f\u6301\u6216\u4fee\u6539\u73b0\u6709<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Extractor<\/code> \u7684\u884c\u4e3a\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E9%92%88%E5%AF%B9%E8%87%AA%E9%80%82%E5%BA%94%E6%B5%81%E7%9A%84%E7%89%B9%E5%8C%96_MediaSource\"><\/span>\u9488\u5bf9\u81ea\u9002\u5e94\u6d41\u7684\u7279\u5316 <code>MediaSource<\/code><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u5982 DASH (Dynamic Adaptive Streaming over HTTP) \u548c HLS (HTTP Live Streaming) \u8fd9\u6837\u7684\u81ea\u9002\u5e94\u6d41\u5a92\u4f53\uff0cExoPlayer \u91c7\u7528\u4e86\u66f4\u4e3a\u7279\u5316\u7684 <code>MediaSource<\/code> \u5b9e\u73b0\uff0c\u5373 <code>DashMediaSource<\/code> \u548c <code>HlsMediaSource<\/code> <sup>12<\/sup>\u3002\u4e0e\u6e10\u8fdb\u5f0f\u4e0b\u8f7d\u4e0d\u540c\uff0c\u8fd9\u4e9b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>MediaSource<\/code> \u9996\u5148\u4f1a\u4e0b\u8f7d\u5e76\u89e3\u6790\u4e00\u4e2a\u6e05\u5355\u6587\u4ef6\uff08manifest\uff09\uff0c\u4f8b\u5982 DASH \u7684 MPD (Media Presentation Description) \u6587\u4ef6\u3002\u8fd9\u4e2a\u6e05\u5355\u6587\u4ef6\u672c\u8eab\u5df2\u7ecf\u5c06\u97f3\u9891\u3001\u89c6\u9891\u7b49\u8f68\u9053\u63cf\u8ff0\u4e3a\u5206\u79bb\u7684\u3001\u53ef\u72ec\u7acb\u83b7\u53d6\u7684\u6d41\uff08\u79f0\u4e3a &#8220;demuxed streams&#8221;\uff09<sup>11<\/sup>\u3002\u56e0\u6b64\uff0c\u5b83\u4eec\u4e0d\u9700\u8981\u50cf\u5904\u7406 MP4 \u6587\u4ef6\u90a3\u6837\u5728\u5ba2\u6237\u7aef\u8fdb\u884c\u5b9e\u65f6\u7684\u89e3\u5c01\u88c5\uff0c\u800c\u662f\u76f4\u63a5\u6839\u636e\u6e05\u5355\u6587\u4ef6\u7684\u63cf\u8ff0\u53bb\u8bf7\u6c42\u76f8\u5e94\u7684\u97f3\u9891\u6216\u89c6\u9891\u6570\u636e\u5206\u7247\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u79cd <code>MediaSource<\/code> \u4e0e\u6838\u5fc3\u64ad\u653e\u5668\u903b\u8f91\u7684\u67b6\u6784\u5206\u79bb\uff0c\u662f ExoPlayer \u80fd\u591f\u652f\u6301\u5e7f\u6cdb\u5a92\u4f53\u683c\u5f0f\u548c\u7f51\u7edc\u534f\u8bae\u7684\u6839\u672c\u539f\u56e0\u3002<code>ExoPlayer<\/code> \u5bf9\u8c61\u672c\u8eab\u4e0d\u5173\u5fc3\u97f3\u9891\u6570\u636e\u662f\u6765\u81ea\u672c\u5730 MP3 \u6587\u4ef6\u3001HTTP \u4e0a\u7684 DASH \u6d41\u8fd8\u662f\u67d0\u79cd\u81ea\u5b9a\u4e49\u534f\u8bae\uff1b\u5b83\u53ea\u4e0e\u62bd\u8c61\u7684 <code>MediaSource<\/code> \u63a5\u53e3\u4ea4\u4e92\u3002\u8fd9\u610f\u5473\u7740\uff0c\u8981\u652f\u6301\u4e00\u79cd\u65b0\u7684\u6d41\u5a92\u4f53\u534f\u8bae\uff0c\u5f00\u53d1\u8005\u53ea\u9700\u5b9e\u73b0\u4e00\u4e2a\u65b0\u7684 <code>MediaSource<\/code>\uff0c\u800c\u65e0\u9700\u89e6\u53ca\u64ad\u653e\u5668\u5185\u90e8\u590d\u6742\u7684\u6e32\u67d3\u548c\u72b6\u6001\u7ba1\u7406\u903b\u8f91\u3002\u8fd9\u662f\u4f9d\u8d56\u5012\u7f6e\u539f\u5219\u7684\u6709\u529b\u5b9e\u8df5\uff0c\u4e5f\u662f ExoPlayer \u76f8\u6bd4\u4e8e\u53d7\u64cd\u4f5c\u7cfb\u7edf\u7248\u672c\u9650\u5236\u7684 <code>MediaPlayer<\/code> \u66f4\u6613\u4e8e\u66f4\u65b0\u548c\u6269\u5c55\u7684\u6838\u5fc3\u4f18\u52bf <sup>1<\/sup>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E9%85%8D%E7%BD%AE%E5%AE%9E%E4%BE%8B%EF%BC%9A%E6%81%92%E5%AE%9A%E6%AF%94%E7%89%B9%E7%8E%87%E6%90%9C%E7%B4%A2\"><\/span>\u914d\u7f6e\u5b9e\u4f8b\uff1a\u6052\u5b9a\u6bd4\u7279\u7387\u641c\u7d22<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5904\u7406\u4e00\u4e9b\u73b0\u5b9e\u4e16\u754c\u4e2d\u4e0d\u5b8c\u7f8e\u7684\u5a92\u4f53\u6587\u4ef6\u65f6\uff0cExoPlayer \u7684\u8bbe\u8ba1\u5c55\u73b0\u4e86\u5176\u52a1\u5b9e\u6027\u3002\u4f8b\u5982\uff0c\u8bb8\u591a MP3 \u6216 ADTS (AAC) \u6587\u4ef6\u7f3a\u4e4f\u7cbe\u786e\u7684\u7d22\u5f15\u4fe1\u606f\uff08seek map\uff09\uff0c\u5bfc\u81f4\u64ad\u653e\u5668\u96be\u4ee5\u8fdb\u884c\u7cbe\u786e\u7684\u65f6\u95f4\u8df3\u8f6c\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0cExoPlayer \u63d0\u4f9b\u4e86\u4e00\u79cd\u57fa\u4e8e\u6052\u5b9a\u6bd4\u7279\u7387\uff08CBR\uff09\u5047\u8bbe\u7684\u8fd1\u4f3c\u641c\u7d22\u529f\u80fd\u3002\u8be5\u529f\u80fd\u9ed8\u8ba4\u5173\u95ed\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7 <code>DefaultExtractorsFactory.setConstantBitrateSeekingEnabled(true)<\/code> \u5f00\u542f <sup>11<\/sup>\u3002\u8fd9\u8868\u660e ExoPlayer \u7684\u8bbe\u8ba1\u54f2\u5b66\u662f\u5728\u4e25\u683c\u9075\u5b88\u6807\u51c6\u548c\u63d0\u4f9b\u5f3a\u5927\u9c81\u68d2\u7684\u529f\u80fd\u4e4b\u95f4\u53d6\u5f97\u5e73\u8861\uff0c\u8fd9\u5bf9\u4e8e\u4e00\u4e2a\u9700\u8981\u5904\u7406\u5404\u79cd\u6765\u6e90\u5185\u5bb9\u7684\u5ba2\u6237\u7aef\u64ad\u653e\u5668\u81f3\u5173\u91cd\u8981\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E4%B8%89%E8%8A%82_%E8%A7%A3%E7%A0%81%E5%99%A8%E9%80%89%E6%8B%A9%EF%BC%9A%E7%BC%96%E8%A7%A3%E7%A0%81%E7%AE%A1%E7%90%86%E7%9A%84%E6%99%BA%E6%85%A7%E6%A0%B8%E5%BF%83\"><\/span>\u7b2c\u4e09\u8282 \u89e3\u7801\u5668\u9009\u62e9\uff1a\u7f16\u89e3\u7801\u7ba1\u7406\u7684\u667a\u6167\u6838\u5fc3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u97f3\u9891\u6570\u636e\u88ab\u89e3\u7801\u4e4b\u524d\uff0cExoPlayer \u5fc5\u987b\u7ecf\u8fc7\u4e00\u4e2a\u7cbe\u5bc6\u7684\u51b3\u7b56\u8fc7\u7a0b\u6765\u9009\u62e9\u4f7f\u7528\u54ea\u4e2a\u89e3\u7801\u5668\uff08Codec\uff09\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff0c\u4f53\u73b0\u4e86\u5176\u8bbe\u8ba1\u7684\u4f18\u96c5\u548c\u5bf9\u590d\u6742 Android \u751f\u6001\u7684\u9002\u5e94\u6027\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E4%B8%80%E9%98%B6%E6%AE%B5%EF%BC%9ATrackSelector_%E7%9A%84%E8%BD%A8%E9%81%93%E9%80%89%E6%8B%A9\"><\/span>\u7b2c\u4e00\u9636\u6bb5\uff1a<code>TrackSelector<\/code> \u7684\u8f68\u9053\u9009\u62e9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u89e3\u7801\u5668\u9009\u62e9\u5e76\u975e\u7b2c\u4e00\u6b65\u3002\u9996\u5148\uff0c<code>DefaultTrackSelector<\/code> \u4f1a\u4ecb\u5165\uff0c\u6839\u636e\u5f00\u53d1\u8005\u8bbe\u7f6e\u7684 <code>TrackSelectionParameters<\/code>\uff08\u4f8b\u5982\u504f\u597d\u8bed\u8a00\u3001\u97f3\u9891\u89d2\u8272\u6807\u5fd7\u3001\u6700\u5927\u6bd4\u7279\u7387\u7b49\uff09\u6765\u51b3\u5b9a\u64ad\u653e\u54ea\u4e00\u4e2a\u97f3\u8f68 <sup>13<\/sup>\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a\u89c6\u9891\u6587\u4ef6\u53ef\u80fd\u5305\u542b\u82f1\u8bed\u3001\u897f\u73ed\u7259\u8bed\u548c\u4e00\u6761\u8bc4\u8bba\u97f3\u8f68\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>TrackSelector<\/code> \u7684\u804c\u8d23\u5c31\u662f\u6839\u636e\u7528\u6237\u504f\u597d\uff08\u6bd4\u5982\u7cfb\u7edf\u8bed\u8a00\u8bbe\u7f6e\u4e3a\u897f\u73ed\u7259\u8bed\uff09\u9009\u62e9\u897f\u73ed\u7259\u8bed\u97f3\u8f68\u8fdb\u884c\u64ad\u653e\u3002\u53ea\u6709\u5728\u786e\u5b9a\u4e86\u8981\u64ad\u653e\u7684\u97f3\u8f68\u540e\uff0c\u63a5\u4e0b\u6765\u7684\u89e3\u7801\u5668\u9009\u62e9\u624d\u6709\u610f\u4e49\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E4%BA%8C%E9%98%B6%E6%AE%B5%EF%BC%9AMediaCodecSelector_%E7%9A%84%E8%A7%A3%E7%A0%81%E5%99%A8%E9%80%89%E6%8B%A9\"><\/span>\u7b2c\u4e8c\u9636\u6bb5\uff1a<code>MediaCodecSelector<\/code> \u7684\u89e3\u7801\u5668\u9009\u62e9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65e6 <code>TrackSelector<\/code> \u9009\u5b9a\u4e86\u97f3\u8f68\uff0c<code>MediaCodecAudioRenderer<\/code> \u5c31\u4f1a\u5229\u7528 <code>MediaCodecSelector<\/code> \u63a5\u53e3\u6765\u4e3a\u8be5\u97f3\u8f68\u7684\u683c\u5f0f\uff08MIME type\uff0c\u5982 <code>audio\/mp4a-latm<\/code> \u4ee3\u8868 AAC\uff09\u5bfb\u627e\u4e00\u4e2a\u5408\u9002\u7684\u89e3\u7801\u5668 <sup>14<\/sup>\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>DEFAULT<\/code> \u5b9e\u73b0<\/strong>\uff1aExoPlayer \u63d0\u4f9b\u4e86\u4e00\u4e2a\u9ed8\u8ba4\u7684 <code>MediaCodecSelector.DEFAULT<\/code> \u5b9e\u73b0\u3002\u5176\u5185\u90e8\u903b\u8f91\u975e\u5e38\u76f4\u63a5\uff1a\u8c03\u7528 <code>MediaCodecUtil.getDecoderInfo()<\/code> <sup>15<\/sup>\u3002<code>MediaCodecUtil<\/code> \u4f1a\u67e5\u8be2 Android \u7cfb\u7edf\u7684 <code>MediaCodecList<\/code>\uff0c\u83b7\u53d6\u8bbe\u5907\u4e0a\u6240\u6709\u53ef\u7528\u7684\u3001\u652f\u6301\u8be5 MIME \u7c7b\u578b\u7684\u89e3\u7801\u5668\u5217\u8868\uff0c\u5e76\u901a\u5e38\u4f1a\u4f18\u5148\u9009\u62e9\u786c\u4ef6\u89e3\u7801\u5668\u3002<\/li>\n\n\n\n<li><strong>\u786c\u4ef6\u4e0e\u8f6f\u4ef6\u89e3\u7801\u5668<\/strong>\uff1a\u786c\u4ef6\u89e3\u7801\u5668\uff08\u5176\u540d\u79f0\u901a\u5e38\u4ee5 <code>OMX.qcom.<\/code> \u6216 <code>c2.android.<\/code> \u7b49\u5f00\u5934\uff09\u5229\u7528\u4e13\u95e8\u7684\u786c\u4ef6\u7535\u8def\u8fdb\u884c\u89e3\u7801\uff0c\u6548\u7387\u9ad8\u4e14\u529f\u8017\u4f4e <sup>24<\/sup>\u3002\u8f6f\u4ef6\u89e3\u7801\u5668\uff08\u5982 <code>OMX.google.aac.decoder<\/code>\uff09\u5219\u5b8c\u5168\u4f9d\u9760 CPU \u8ba1\u7b97\uff0c\u6027\u80fd\u8f83\u5dee\u3002<code>MediaCodecSelector<\/code> \u7684\u9ed8\u8ba4\u903b\u8f91\u4f1a\u4f18\u5148\u8fd4\u56de\u786c\u4ef6\u89e3\u7801\u5668\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%AE%9A%E5%88%B6%E5%8C%96%E4%B8%8E%E5%9B%9E%E9%80%80%E6%9C%BA%E5%88%B6\"><\/span>\u5b9a\u5236\u5316\u4e0e\u56de\u9000\u673a\u5236<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Android \u7684 <code>MediaCodec<\/code> \u751f\u6001\u7cfb\u7edf\u5b58\u5728\u4e25\u91cd\u7684\u788e\u7247\u5316\u95ee\u9898\u3002\u5c3d\u7ba1 Android \u5b98\u65b9\u6587\u6863\u5217\u51fa\u4e86\u652f\u6301\u7684\u683c\u5f0f\uff0c\u4f46\u6bcf\u4e2a\u8bbe\u5907\u5236\u9020\u5546\uff08OEM\uff09\u5bf9\u7f16\u89e3\u7801\u5668\u7684\u5b9e\u73b0\u90fd\u53ef\u80fd\u5b58\u5728\u5dee\u5f02\uff0c\u4ece\u800c\u5bfc\u81f4\u5728\u7279\u5b9a\u8bbe\u5907\u4e0a\u51fa\u73b0\u5404\u79cd\u5947\u602a\u7684 bug <sup>11<\/sup>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>MediaCodecSelector<\/code> \u53ca\u5176\u76f8\u5173\u7684\u5b9a\u5236\u5316\u9009\u9879\uff0c\u6b63\u662f ExoPlayer \u7528\u6765\u5c4f\u853d\u8fd9\u79cd\u5e95\u5c42\u788e\u7247\u5316\u3001\u4fdd\u62a4\u5e94\u7528\u7a33\u5b9a\u6027\u7684\u5173\u952e\u62bd\u8c61\u5c42\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>setEnableDecoderFallback(true)<\/code><\/strong>\uff1a\u8fd9\u662f <code>DefaultRenderersFactory<\/code> \u4e0a\u4e00\u4e2a\u81f3\u5173\u91cd\u8981\u7684\u914d\u7f6e\u3002\u5f53\u8bbe\u7f6e\u4e3a <code>true<\/code> \u65f6\uff0c\u5982\u679c <code>MediaCodecAudioRenderer<\/code> \u5c1d\u8bd5\u521d\u59cb\u5316\u9996\u9009\u89e3\u7801\u5668\uff08\u901a\u5e38\u662f\u786c\u4ef6\u89e3\u7801\u5668\uff09\u5931\u8d25\uff0c\u5b83\u4e0d\u4f1a\u7acb\u5373\u629b\u51fa\u9519\u8bef\u5bfc\u81f4\u64ad\u653e\u5931\u8d25\uff0c\u800c\u662f\u4f1a\u81ea\u52a8\u5c1d\u8bd5\u5217\u8868\u4e2d\u7684\u4e0b\u4e00\u4e2a\u89e3\u7801\u5668\uff08\u901a\u5e38\u662f\u8f6f\u4ef6\u89e3\u7801\u5668\uff09<sup>26<\/sup>\u3002\u8fd9\u4e2a\u529f\u80fd\u5bf9\u4e8e\u5904\u7406\u8bbe\u5907\u7279\u5b9a\u7684\u89e3\u7801\u5668\u95ee\u9898\u81f3\u5173\u91cd\u8981\uff0c\u662f\u5e94\u5bf9\u89e3\u7801\u5668\u521d\u59cb\u5316\u5931\u8d25\u7684\u5185\u7f6e\u201c\u4fdd\u9669\u4e1d\u201d\u3002<\/li>\n\n\n\n<li><strong>\u6ce8\u5165\u81ea\u5b9a\u4e49 <code>MediaCodecSelector<\/code><\/strong>\uff1a\u4e3a\u4e86\u83b7\u5f97\u6700\u5927\u7a0b\u5ea6\u7684\u63a7\u5236\u6743\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u5b9e\u73b0\u81ea\u5df1\u7684 <code>MediaCodecSelector<\/code> \u63a5\u53e3\u3002\u8fd9\u5728\u9700\u8981\u5f3a\u5236\u4f7f\u7528\u67d0\u4e2a\u7279\u5b9a\u89e3\u7801\u5668\uff0c\u6216\u8005\u5728\u67d0\u4e9b\u5df2\u77e5\u6709\u95ee\u9898\u7684\u8bbe\u5907\u4e0a\u7981\u7528\u67d0\u4e2a\u89e3\u7801\u5668\u65f6\u975e\u5e38\u6709\u7528 <sup>29<\/sup>\u3002\u5b9e\u73b0\u81ea\u5b9a\u4e49\u9009\u62e9\u5668\u540e\uff0c\u9700\u8981\u901a\u8fc7\u521b\u5efa\u81ea\u5b9a\u4e49\u7684 <code>Renderer<\/code> \u6570\u7ec4\uff0c\u5e76\u5c06\u5176\u4f20\u9012\u7ed9 <code>ExoPlayer.Builder<\/code> \u6765\u5b8c\u6210\u6ce8\u5165 <sup>29<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u8986\u76d6 <code>getDecoderInfos<\/code><\/strong>\uff1a\u4e00\u79cd\u66f4\u73b0\u4ee3\u3001\u66f4\u7cbe\u51c6\u7684\u5b9a\u5236\u65b9\u6cd5\u662f\u7ee7\u627f <code>MediaCodecAudioRenderer<\/code> \u5e76\u8986\u76d6\u5176 <code>getDecoderInfos<\/code> \u65b9\u6cd5\u3002\u8fd9\u5141\u8bb8\u5e94\u7528\u5728 <code>Renderer<\/code> \u5c1d\u8bd5\u4f7f\u7528\u89e3\u7801\u5668\u4e4b\u524d\uff0c\u5148\u5bf9\u9ed8\u8ba4\u9009\u62e9\u5668\u8fd4\u56de\u7684\u89e3\u7801\u5668\u5217\u8868\u8fdb\u884c\u8fc7\u6ee4\u6216\u91cd\u6392\u5e8f <sup>30<\/sup>\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u4e24\u9636\u6bb5\u7684\u9009\u62e9\u8fc7\u7a0b\u2014\u2014<code>TrackSelector<\/code> \u51b3\u5b9a<em>\u64ad\u653e\u4ec0\u4e48<\/em>\uff0c<code>MediaCodecSelector<\/code> \u51b3\u5b9a<em>\u7528\u4ec0\u4e48\u6765\u64ad\u653e<\/em>\u2014\u2014\u4f53\u73b0\u4e86\u6e05\u6670\u7684\u5173\u6ce8\u70b9\u5206\u79bb\u3002\u9009\u62e9\u9ad8\u6bd4\u7279\u7387\u97f3\u8f68\u7684\u903b\u8f91\u4e0e\u5bfb\u627e\u786c\u4ef6\u52a0\u901f\u89e3\u7801\u5668\u7684\u903b\u8f91\u5b8c\u5168\u72ec\u7acb\uff0c\u8fd9\u4f7f\u5f97\u6574\u4e2a\u7cfb\u7edf\u66f4\u5bb9\u6613\u7406\u89e3\u3001\u7ef4\u62a4\u548c\u5b9a\u5236\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E5%9B%9B%E8%8A%82_%E9%9F%B3%E9%A2%91%E8%A7%A3%E7%A0%81%EF%BC%9A%E4%BB%8E%E5%8E%8B%E7%BC%A9%E6%95%B0%E6%8D%AE%E5%88%B0%E5%8E%9F%E5%A7%8B_PCM\"><\/span>\u7b2c\u56db\u8282 \u97f3\u9891\u89e3\u7801\uff1a\u4ece\u538b\u7f29\u6570\u636e\u5230\u539f\u59cb PCM<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9009\u5b9a\u89e3\u7801\u5668\u540e\uff0c\u5c31\u8fdb\u5165\u4e86\u5b9e\u9645\u7684\u89e3\u7801\u9636\u6bb5\u3002<code>MediaCodecAudioRenderer<\/code> \u5728\u8fd9\u91cc\u626e\u6f14\u4e86\u6838\u5fc3\u89d2\u8272\uff0c\u5b83\u8d1f\u8d23\u5c06\u4ece <code>MediaSource<\/code> \u8bfb\u53d6\u7684\u538b\u7f29\u97f3\u9891\u6570\u636e\u8f6c\u5316\u4e3a\u53ef\u4f9b\u64ad\u653e\u7684\u539f\u59cb PCM \u6570\u636e\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"MediaCodecAudioRenderer_%E7%9A%84%E6%A0%B8%E5%BF%83%E8%81%8C%E8%B4%A3\"><\/span><code>MediaCodecAudioRenderer<\/code> \u7684\u6838\u5fc3\u804c\u8d23<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>MediaCodecAudioRenderer<\/code> \u662f\u97f3\u9891\u89e3\u7801\u9636\u6bb5\u7684\u4e3b\u529b\u519b <sup>16<\/sup>\u3002\u5b83\u7ee7\u627f\u81ea\u901a\u7528\u7684<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>MediaCodecRenderer<\/code> <sup>14<\/sup>\uff0c\u540e\u8005\u5c01\u88c5\u4e86\u4e0e Android \u5e95\u5c42<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>MediaCodec<\/code> API \u4ea4\u4e92\u7684\u901a\u7528\u903b\u8f91\u3002<code>MediaCodecAudioRenderer<\/code> \u7684\u7279\u5b9a\u804c\u8d23\u5c31\u662f\u5904\u7406\u97f3\u9891\u6570\u636e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b83\u5b9e\u9645\u4e0a\u626e\u6f14\u4e86\u4e00\u4e2a\u7cbe\u5bc6\u7684\u72b6\u6001\u673a\u89d2\u8272\uff0c\u5c06\u4e0a\u5c42\u64ad\u653e\u5668\u53d1\u51fa\u7684\u7b80\u5355\u6307\u4ee4\uff08\u5982 <code>play<\/code>, <code>pause<\/code>, <code>seekTo<\/code>\uff09\u8f6c\u6362\u4e3a\u4e0e\u5e95\u5c42 <code>MediaCodec<\/code> API \u8fdb\u884c\u4ea4\u4e92\u6240\u9700\u7684\u4e00\u7cfb\u5217\u590d\u6742\u3001\u5f02\u6b65\u4e14\u6709\u72b6\u6001\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%A7%A3%E7%A0%81%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F\"><\/span>\u89e3\u7801\u751f\u547d\u5468\u671f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>\u521d\u59cb\u5316<\/strong>\uff1a<code>Renderer<\/code> \u4f7f\u7528 <code>MediaCodecSelector<\/code> \u83b7\u53d6\u63cf\u8ff0\u89e3\u7801\u5668\u7684 <code>MediaCodecInfo<\/code>\uff0c\u7136\u540e\u521b\u5efa\u5e76\u914d\u7f6e\u4e00\u4e2a <code>MediaCodec<\/code> \u5b9e\u4f8b <sup>14<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u6570\u636e\u4ea4\u6362\u5faa\u73af<\/strong>\uff1a<code>Renderer<\/code> \u8fdb\u5165\u4e00\u4e2a\u6301\u7eed\u7684\u5faa\u73af\u3002\u5b83\u4ece <code>MediaCodec<\/code> \u4e2d\u53d6\u51fa\u4e00\u4e2a\u53ef\u7528\u7684\u8f93\u5165\u7f13\u51b2\u533a\uff08input buffer\uff09\uff0c\u7528\u4ece <code>MediaSource<\/code> \u8bfb\u53d6\u7684\u538b\u7f29\u97f3\u9891\u6570\u636e\u586b\u5145\u5b83\uff0c\u7136\u540e\u5c06\u8fd9\u4e2a\u586b\u5145\u597d\u7684\u7f13\u51b2\u533a\u4ea4\u8fd8\u7ed9 <code>MediaCodec<\/code> \u8fdb\u884c\u89e3\u7801\u3002<\/li>\n\n\n\n<li><strong>\u83b7\u53d6\u89e3\u7801\u8f93\u51fa<\/strong>\uff1a\u540c\u65f6\uff0c<code>Renderer<\/code> \u4f1a\u4ece <code>MediaCodec<\/code> \u4e2d\u53d6\u51fa\u4e00\u4e2a\u8f93\u51fa\u7f13\u51b2\u533a\uff08output buffer\uff09\u3002\u5982\u679c\u89e3\u7801\u6210\u529f\uff0c\u8fd9\u4e2a\u7f13\u51b2\u533a\u5c06\u5305\u542b\u539f\u59cb\u7684\u3001\u672a\u538b\u7f29\u7684 PCM \u97f3\u9891\u6570\u636e <sup>31<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u6570\u636e\u4f20\u9012<\/strong>\uff1a<code>Renderer<\/code> \u5c06\u5305\u542b PCM \u6570\u636e\u7684\u8f93\u51fa\u7f13\u51b2\u533a\u4f20\u9012\u7ed9\u4e0b\u4e00\u9636\u6bb5\u7684 <code>AudioSink<\/code> \u8fdb\u884c\u6e32\u67d3 <sup>17<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u72b6\u6001\u7ba1\u7406<\/strong>\uff1a<code>Renderer<\/code> \u8d1f\u8d23 <code>MediaCodec<\/code> \u7684\u6574\u4e2a\u751f\u547d\u5468\u671f\u3002\u4f8b\u5982\uff0c\u5f53\u7528\u6237\u6267\u884c <code>seekTo<\/code> \u64cd\u4f5c\u65f6\uff0c<code>Renderer<\/code> \u77e5\u9053\u5fc5\u987b\u8c03\u7528 <code>flushCodec()<\/code> \u6765\u6e05\u7a7a\u89e3\u7801\u5668\u5185\u90e8\u7684\u6240\u6709\u7f13\u51b2\u6570\u636e\uff0c\u7136\u540e\u4ece\u65b0\u7684\u65f6\u95f4\u70b9\u5f00\u59cb\u4f9b\u7ed9\u6570\u636e <sup>14<\/sup>\u3002\u5f53\u4e0d\u518d\u9700\u8981\u65f6\uff0c\u5b83\u4f1a\u8d1f\u8d23\u91ca\u653e <code>MediaCodec<\/code> \u8d44\u6e90\u3002\u8fd9\u79cd\u5c01\u88c5\u6781\u5927\u5730\u7b80\u5316\u4e86\u5f00\u53d1\uff0c\u8ba9\u5e94\u7528\u5f00\u53d1\u8005\u4e0d\u5fc5\u76f4\u63a5\u9762\u5bf9 <code>MediaCodec<\/code> API \u7684\u590d\u6742\u6027 <sup>4<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u9519\u8bef\u5904\u7406<\/strong>\uff1a\u5728\u89e3\u7801\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u53d1\u751f\u7684\u4efb\u4f55\u9519\u8bef\uff08\u4f8b\u5982\u89e3\u7801\u5668\u5d29\u6e83\u6216\u4e0d\u652f\u6301\u7684\u6570\u636e\u683c\u5f0f\uff09\u90fd\u4f1a\u88ab <code>Renderer<\/code> \u6355\u83b7\uff0c\u5e76\u4f5c\u4e3a <code>ExoPlaybackException<\/code> \u5411\u4e0a\u5c42\u62a5\u544a\uff0c\u901a\u5e38\u4f1a\u9644\u5e26 <code>MediaCodecAudioRenderer error<\/code> \u7684\u5177\u4f53\u4fe1\u606f <sup>25<\/sup>\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><code>MediaCodecAudioRenderer<\/code> \u7684\u5b58\u5728\uff0c\u662f ExoPlayer \u76f8\u6bd4\u76f4\u63a5\u4f7f\u7528 <code>MediaCodec<\/code> API \u6784\u5efa\u64ad\u653e\u5668\u7684\u4e3b\u8981\u4ef7\u503c\u4e4b\u4e00\u3002\u5b83\u5c06\u9ad8\u5c42\u3001\u9762\u5411\u7528\u6237\u7684\u64ad\u653e\u5668\u72b6\u6001\u4e0e\u5e95\u5c42\u3001\u9762\u5411\u786c\u4ef6\u7684\u7f16\u89e3\u7801\u5668\u72b6\u6001\u4e4b\u95f4\u5efa\u7acb\u4e86\u4e00\u5ea7\u575a\u56fa\u7684\u6865\u6881\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E4%BA%94%E8%8A%82_%E9%9F%B3%E9%A2%91%E6%B8%B2%E6%9F%93%E4%B8%8E%E5%A4%84%E7%90%86%EF%BC%9A%E9%80%9A%E5%BE%80%E6%89%AC%E5%A3%B0%E5%99%A8%E7%9A%84%E6%9C%80%E5%90%8E%E6%97%85%E7%A8%8B\"><\/span>\u7b2c\u4e94\u8282 \u97f3\u9891\u6e32\u67d3\u4e0e\u5904\u7406\uff1a\u901a\u5f80\u626c\u58f0\u5668\u7684\u6700\u540e\u65c5\u7a0b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u97f3\u9891\u6570\u636e\u88ab\u89e3\u7801\u6210\u539f\u59cb\u7684 PCM \u683c\u5f0f\u540e\uff0c\u5c31\u8fdb\u5165\u4e86\u64ad\u653e\u7ba1\u9053\u7684\u6700\u540e\u9636\u6bb5\uff1a\u6e32\u67d3\u4e0e\u5904\u7406\u3002\u8fd9\u662f ExoPlayer \u4e2d\u53ef\u5b9a\u5236\u6027\u6700\u5f3a\u7684\u90e8\u5206\u4e4b\u4e00\uff0c\u5141\u8bb8\u5f00\u53d1\u8005\u5b9e\u73b0\u5404\u79cd\u9ad8\u7ea7\u97f3\u9891\u529f\u80fd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"AudioSink_%E6%8E%A5%E5%8F%A3%EF%BC%9A%E9%9F%B3%E9%A2%91%E6%95%B0%E6%8D%AE%E7%9A%84%E7%BB%88%E7%82%B9\"><\/span><code>AudioSink<\/code> \u63a5\u53e3\uff1a\u97f3\u9891\u6570\u636e\u7684\u7ec8\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>AudioSink<\/code> \u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e2a\u6d88\u8d39 PCM \u97f3\u9891\u6570\u636e\u7684\u7ec4\u4ef6\u7684\u89c4\u8303 <sup>20<\/sup>\u3002\u5b83\u662f\u97f3\u9891\u6570\u636e\u5728 ExoPlayer \u5185\u90e8\u6d41\u52a8\u7684\u7ec8\u70b9\u7ad9\uff0c\u8d1f\u8d23\u5c06\u6570\u636e\u4f20\u9012\u7ed9 Android \u7cfb\u7edf\u8fdb\u884c\u6700\u7ec8\u64ad\u653e\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%A0%B8%E5%BF%83%E7%B1%BB%EF%BC%9ADefaultAudioSink\"><\/span>\u6838\u5fc3\u7c7b\uff1a<code>DefaultAudioSink<\/code><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>DefaultAudioSink<\/code> \u662f <code>AudioSink<\/code> \u63a5\u53e3\u7684\u9ed8\u8ba4\u5b9e\u73b0\uff0c\u4e5f\u662f\u7edd\u5927\u591a\u6570\u5e94\u7528\u4f1a\u4f7f\u7528\u7684\u5b9e\u73b0\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4e3b\u8981\u89d2\u8272<\/strong>\uff1a\u5b83\u7684\u6838\u5fc3\u804c\u8d23\u662f\u5c01\u88c5\u548c\u7ba1\u7406\u4e00\u4e2a Android \u5e95\u5c42\u7684 <code>AudioTrack<\/code> \u5b9e\u4f8b <sup>4<\/sup>\u3002<code>AudioTrack<\/code> \u662f Android \u7cfb\u7edf\u63d0\u4f9b\u7684\u6807\u51c6 API\uff0c\u7528\u4e8e\u64ad\u653e\u539f\u59cb\u97f3\u9891\u6d41\u3002<code>DefaultAudioSink<\/code> \u5c06\u89e3\u7801\u540e\u7684 PCM \u6570\u636e\u5757\u5199\u5165\u8fd9\u4e2a <code>AudioTrack<\/code>\uff0c\u7531\u540e\u8005\u63d0\u4ea4\u7ed9\u97f3\u9891\u786c\u4ef6\u3002<\/li>\n\n\n\n<li><strong>\u914d\u7f6e\u4e0e\u521d\u59cb\u5316<\/strong>\uff1a<code>DefaultAudioSink<\/code> \u5177\u6709\u9ad8\u5ea6\u7684\u53ef\u914d\u7f6e\u6027\uff0c\u4e3b\u8981\u901a\u8fc7\u5176 <code>Builder<\/code> \u7c7b\u8fdb\u884c <sup>33<\/sup>\u3002\u5728\u914d\u7f6e\u9636\u6bb5\uff0c\u5b83\u4f1a\u6839\u636e\u97f3\u9891\u6d41\u7684\u683c\u5f0f\uff08\u91c7\u6837\u7387\u3001\u58f0\u9053\u6570\u3001\u7f16\u7801\u683c\u5f0f\uff09\u521b\u5efa\u4e00\u4e2a <code>AudioTrack<\/code>\u3002\u8fd9\u4e2a\u521d\u59cb\u5316\u8fc7\u7a0b\u53ef\u80fd\u4f1a\u5931\u8d25\uff0c\u5c24\u5176\u662f\u5728\u8bbe\u5907\u8d44\u6e90\u53d7\u9650\u6216\u4e0d\u652f\u6301\u7279\u5b9a\u97f3\u9891\u914d\u7f6e\u7684\u60c5\u51b5\u4e0b\uff0c\u6b64\u65f6\u4f1a\u629b\u51fa <code>AudioSink$InitializationException<\/code> <sup>27<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u9ad8\u7ea7\u529f\u80fd<\/strong>\uff1a\u9664\u4e86\u57fa\u672c\u7684\u64ad\u653e\uff0c<code>DefaultAudioSink<\/code> \u8fd8\u5904\u7406\u4e86\u8bb8\u591a\u590d\u6742\u529f\u80fd\uff0c\u4f8b\u5982\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>\u97f3\u9891\u76f4\u901a\uff08Passthrough\uff09<\/strong>\uff1a\u5f53\u8fde\u63a5\u4e86\u652f\u6301\u675c\u6bd4\u97f3\u6548\u7b49\u7684\u5916\u90e8\u89e3\u7801\u8bbe\u5907\u65f6\uff0c\u53ef\u4ee5\u5c06\u7f16\u7801\u540e\u7684\u97f3\u9891\u6d41\uff08\u5982 AC3\uff09\u4e0d\u7ecf\u89e3\u7801\u76f4\u63a5\u900f\u4f20\u51fa\u53bb <sup>35<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u97f3\u9891\u5378\u8f7d\uff08Offload\uff09<\/strong>\uff1a\u5c06\u97f3\u9891\u89e3\u7801\u4efb\u52a1\u5b8c\u5168\u4ea4\u7ed9\u4e13\u7528\u7684\u6570\u5b57\u4fe1\u53f7\u5904\u7406\u5668\uff08DSP\uff09\u6765\u5b8c\u6210\uff0c\u4ece\u800c\u6781\u5927\u5730\u964d\u4f4e CPU \u5360\u7528\u548c\u529f\u8017\uff0c\u7279\u522b\u9002\u7528\u4e8e\u957f\u65f6\u95f4\u7684\u540e\u53f0\u97f3\u4e50\u64ad\u653e <sup>36<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u64ad\u653e\u901f\u5ea6\u8c03\u6574<\/strong>\uff1a\u7ba1\u7406\u97f3\u9891\u7684\u53d8\u901f\u64ad\u653e\uff0c\u53ef\u4ee5\u5229\u7528\u5e73\u53f0\u80fd\u529b\u6216\u5185\u7f6e\u7684 <code>SonicAudioProcessor<\/code> <sup>33<\/sup>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%A0%B8%E5%BF%83%E7%B1%BB%EF%BC%9AAudioProcessor\"><\/span>\u6838\u5fc3\u7c7b\uff1a<code>AudioProcessor<\/code><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>AudioProcessor<\/code> \u63a5\u53e3\u662f ExoPlayer \u6700\u5f3a\u5927\u7684\u5b9a\u5236\u5316\u7279\u6027\u4e4b\u4e00\uff0c\u5b83\u5c06 ExoPlayer \u4ece\u4e00\u4e2a\u5355\u7eaf\u7684\u201c\u64ad\u653e\u5668\u201d\u63d0\u5347\u4e3a\u4e86\u4e00\u4e2a\u201c\u5a92\u4f53\u5904\u7406\u5f15\u64ce\u201d\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5b9a\u5236\u5316\u94a9\u5b50<\/strong>\uff1a<code>AudioProcessor<\/code> \u5141\u8bb8\u5f00\u53d1\u8005\u5728\u539f\u59cb PCM \u97f3\u9891\u6570\u636e\u4ece\u89e3\u7801\u5668\uff08<code>MediaCodecAudioRenderer<\/code>\uff09\u6d41\u5411 <code>AudioSink<\/code> \u7684\u8fc7\u7a0b\u4e2d\uff0c\u8fdb\u884c\u5b9e\u65f6\u7684\u68c0\u67e5\u548c\u4fee\u6539 <sup>18<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u5b9e\u73b0\u4e0e\u6ce8\u5165<\/strong>\uff1a\u5f00\u53d1\u8005\u53ef\u4ee5\u521b\u5efa\u81ea\u5df1\u7684\u7c7b\u6765\u5b9e\u73b0 <code>AudioProcessor<\/code> \u63a5\u53e3 <sup>37<\/sup>\u3002\u7136\u540e\uff0c\u901a\u8fc7 <code>DefaultAudioSink.Builder<\/code> \u7684 <code>setAudioProcessors<\/code> \u65b9\u6cd5\uff0c\u5c06\u4e00\u4e2a\u6216\u591a\u4e2a\u5904\u7406\u5668\u5b9e\u4f8b\u6ce8\u5165\u5230\u5904\u7406\u94fe\u4e2d <sup>34<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u6570\u636e\u683c\u5f0f<\/strong>\uff1a\u6807\u51c6\u7684 <code>AudioProcessor<\/code> \u7ba1\u9053\u5904\u7406\u7684\u662f 16\u4f4d\u6574\u6570\uff08PCM 16-bit\uff09\u7684\u97f3\u9891\u6570\u636e\u3002\u5982\u679c\u5f00\u53d1\u8005\u7684\u7b97\u6cd5\u9700\u8981\u5904\u7406\u6d6e\u70b9\u6570\uff0c\u5219\u9700\u8981\u5728\u81ea\u5b9a\u4e49\u5904\u7406\u5668\u5185\u90e8\u8fdb\u884c\u683c\u5f0f\u8f6c\u6362 <sup>18<\/sup>\u3002<\/li>\n\n\n\n<li><strong>\u5e94\u7528\u573a\u666f<\/strong>\uff1a<code>AudioProcessor<\/code> \u7684\u5e94\u7528\u573a\u666f\u6781\u4e3a\u5e7f\u6cdb\uff0c\u5305\u62ec\uff1a\n<ul class=\"wp-block-list\">\n<li>\u6784\u5efa\u81ea\u5b9a\u4e49\u5747\u8861\u5668\uff08Equalizer\uff09<sup>40<\/sup>\u3002<\/li>\n\n\n\n<li>\u5b9e\u73b0\u72ec\u7acb\u7684\u58f0\u9053\u97f3\u91cf\u63a7\u5236 <sup>38<\/sup>\u3002<\/li>\n\n\n\n<li>\u901a\u8fc7\u5bf9 PCM \u6570\u636e\u8fdb\u884c\u5feb\u901f\u5085\u91cc\u53f6\u53d8\u6362\uff08FFT\uff09\u6765\u5b9e\u73b0\u97f3\u9891\u53ef\u89c6\u5316\u6548\u679c <sup>42<\/sup>\u3002<\/li>\n\n\n\n<li>ExoPlayer \u81ea\u8eab\u4e5f\u63d0\u4f9b\u4e86\u591a\u4e2a\u5185\u7f6e\u5904\u7406\u5668\uff0c\u5982\u7528\u4e8e\u53d8\u901f\u53d8\u8c03\u7684 <code>SonicAudioProcessor<\/code> \u548c\u7528\u4e8e\u8df3\u8fc7\u9759\u97f3\u7247\u6bb5\u7684 <code>SilenceSkippingAudioProcessor<\/code> <sup>43<\/sup>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%A0%B8%E5%BF%83%E7%B1%BB%EF%BC%9ADefaultAudioSinkBuilder\"><\/span>\u6838\u5fc3\u7c7b\uff1a<code>DefaultAudioSink.Builder<\/code><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a Builder \u7c7b\u662f\u6784\u5efa\u548c\u914d\u7f6e <code>DefaultAudioSink<\/code> \u5b9e\u4f8b\u7684\u552f\u4e00\u5165\u53e3 <sup>33<\/sup>\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5173\u952e\u65b9\u6cd5<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li><code>setAudioProcessors(AudioProcessor processors)<\/code>\uff1a\u6ce8\u5165\u81ea\u5b9a\u4e49\u7684\u97f3\u9891\u5904\u7406\u5668\u94fe <sup>34<\/sup>\u3002<\/li>\n\n\n\n<li><code>setEnableFloatOutput(boolean enable)<\/code>\uff1a\u914d\u7f6e <code>AudioSink<\/code> \u5c1d\u8bd5\u8f93\u51fa 32\u4f4d\u6d6e\u70b9 PCM \u6570\u636e\uff0c\u524d\u63d0\u662f\u8bbe\u5907\u652f\u6301 <sup>33<\/sup>\u3002<\/li>\n\n\n\n<li><code>setAudioTrackBufferSizeProvider(...)<\/code>\uff1a\u5141\u8bb8\u63d0\u4f9b\u81ea\u5b9a\u4e49\u903b\u8f91\u6765\u8ba1\u7b97\u5e95\u5c42 <code>AudioTrack<\/code> \u7684\u7f13\u51b2\u533a\u5927\u5c0f <sup>33<\/sup>\u3002<\/li>\n\n\n\n<li><code>setAudioOffloadSupportProvider(...)<\/code>\uff1a\u4e3a\u97f3\u9891\u5378\u8f7d\u64ad\u653e\u914d\u7f6e\u652f\u6301\u63d0\u4f9b\u8005 <sup>33<\/sup>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5b9e\u8df5\u4e2d\uff0c<code>AudioTrack init failed<\/code> <sup>32<\/sup> \u6216<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>java.lang.UnsupportedOperationException: Cannot create AudioTrack<\/code> <sup>32<\/sup> \u8fd9\u7c7b\u9519\u8bef\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u8bca\u65ad\u4fe1\u53f7\u3002\u8fd9\u4e2a\u9519\u8bef\u76f4\u63a5\u6765\u81ea Android \u6846\u67b6\u5e95\u5c42\uff0c\u610f\u5473\u7740\u7cfb\u7edf\u65e0\u6cd5\u518d\u521b\u5efa\u65b0\u7684<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>AudioTrack<\/code> \u5b9e\u4f8b\u3002\u8fd9\u901a\u5e38\u4e0d\u662f ExoPlayer \u81ea\u8eab\u7684 bug\uff0c\u800c\u662f\u5e94\u7528\u5c42\u51fa\u73b0\u4e86\u95ee\u9898\uff0c\u6700\u5e38\u89c1\u7684\u539f\u56e0\u5c31\u662f\u8d44\u6e90\u6cc4\u6f0f\u3002\u4f8b\u5982\uff0c\u5e94\u7528\u5728\u64ad\u653e\u5b8c\u4e00\u4e2a\u97f3\u9891\u540e\u6ca1\u6709\u6b63\u786e\u8c03\u7528 <code>player.release()<\/code> <sup>3<\/sup>\u3002\u6bcf\u4e2a\u672a\u91ca\u653e\u7684\u64ad\u653e\u5668\u5b9e\u4f8b\u90fd\u4f1a\u6301\u6709\u4e00\u4e2a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>AudioTrack<\/code> \u8d44\u6e90\u3002\u5f53\u8fd9\u79cd\u672a\u91ca\u653e\u7684\u5b9e\u4f8b\u7d2f\u79ef\u5230\u4e00\u5b9a\u6570\u91cf\u540e\uff0c\u7cfb\u7edf\u53ef\u7528\u7684\u97f3\u9891\u8f68\u9053\u8d44\u6e90\u88ab\u8017\u5c3d\uff0c\u4e0b\u4e00\u6b21\u521b\u5efa <code>AudioTrack<\/code> \u7684\u5c1d\u8bd5\u4fbf\u4f1a\u5931\u8d25\u3002\u56e0\u6b64\uff0c\u8fd9\u4e2a\u5e95\u5c42\u7684\u6e32\u67d3\u9519\u8bef\u662f\u201c\u75c7\u72b6\u201d\uff0c\u800c\u201c\u75c5\u56e0\u201d\u5f80\u5f80\u662f\u4e0a\u5c42\u5e94\u7528\u4ee3\u7801\u4e2d\u7684\u8d44\u6e90\u7ba1\u7406\u4e0d\u5f53\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E5%85%AD%E8%8A%82_%E7%BB%93%E8%AE%BA%EF%BC%9A%E6%9E%B6%E6%9E%84%E6%95%B4%E5%90%88%E4%B8%8E%E5%AE%9E%E8%B7%B5%E5%BB%BA%E8%AE%AE\"><\/span>\u7b2c\u516d\u8282 \u7ed3\u8bba\uff1a\u67b6\u6784\u6574\u5408\u4e0e\u5b9e\u8df5\u5efa\u8bae<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%AE%A1%E9%81%93%E6%80%BB%E7%BB%93\"><\/span>\u7ba1\u9053\u603b\u7ed3<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ExoPlayer \u7684\u97f3\u9891\u64ad\u653e\u7ba1\u9053\u662f\u4e00\u4e2a\u7cbe\u5fc3\u8bbe\u8ba1\u7684\u3001\u9ad8\u5ea6\u6a21\u5757\u5316\u7684\u7cfb\u7edf\u3002\u6570\u636e\u4ece\u4e00\u4e2a\u4ee3\u8868\u5a92\u4f53\u7684 <code>MediaItem<\/code> \u5f00\u59cb\uff0c\u7ecf\u7531 <code>MediaSource<\/code> \u52a0\u8f7d\u548c <code>Extractor<\/code> \u89e3\u5c01\u88c5\uff0c\u5206\u79bb\u51fa\u538b\u7f29\u7684\u97f3\u9891\u6d41\u3002\u968f\u540e\uff0c<code>TrackSelector<\/code> \u548c <code>MediaCodecSelector<\/code> \u534f\u540c\u5de5\u4f5c\uff0c\u4e3a\u8be5\u6d41\u9009\u62e9\u6700\u5408\u9002\u7684\u97f3\u8f68\u548c\u89e3\u7801\u5668\u3002<code>MediaCodecAudioRenderer<\/code> \u4f7f\u7528\u9009\u5b9a\u7684\u89e3\u7801\u5668\u5c06\u6570\u636e\u8f6c\u6362\u4e3a\u539f\u59cb PCM \u6d41\u3002\u8fd9\u4e2a PCM \u6d41\u5728\u6700\u7ec8\u88ab <code>AudioSink<\/code> \u548c\u5e95\u5c42\u7684 <code>AudioTrack<\/code> \u6d88\u8d39\u5e76\u64ad\u653e\u4e4b\u524d\uff0c\u53ef\u4ee5\u7ecf\u8fc7\u4e00\u4e2a\u7075\u6d3b\u7684 <code>AudioProcessor<\/code> \u94fe\u8fdb\u884c\u4efb\u610f\u7684\u5b9e\u65f6\u5904\u7406\u3002\u6574\u4e2a\u8bbe\u8ba1\u7684\u6838\u5fc3\u5728\u4e8e\u5176\u6a21\u5757\u5316 <sup>1<\/sup>\uff0c\u8fd9\u4e0d\u4ec5\u4f7f\u5176\u529f\u80fd\u5f3a\u5927\uff08\u5982\u652f\u6301\u81ea\u5b9a\u4e49<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>AudioProcessor<\/code> <sup>18<\/sup>\uff09\uff0c\u4e5f\u4f7f\u5176\u80fd\u591f\u4f18\u96c5\u5730\u5e94\u5bf9 Android \u751f\u6001\u7684\u788e\u7247\u5316\uff08\u5982\u901a\u8fc7<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>setEnableDecoderFallback<\/code> \u5904\u7406\u6709\u95ee\u9898\u7684\u89e3\u7801\u5668 <sup>26<\/sup>\uff09\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%AE%9E%E7%94%A8%E8%B0%83%E8%AF%95%E7%AD%96%E7%95%A5\"><\/span>\u5b9e\u7528\u8c03\u8bd5\u7b56\u7565<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7406\u89e3\u4e86\u6574\u4e2a\u6570\u636e\u6d41\u4e4b\u540e\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u6839\u636e\u9047\u5230\u7684\u95ee\u9898\u7c7b\u578b\uff0c\u5feb\u901f\u5b9a\u4f4d\u5230\u53ef\u80fd\u7684\u6545\u969c\u73af\u8282\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u5b9a\u6587\u4ef6\u65e0\u6cd5\u5f00\u59cb\u64ad\u653e<\/strong>\uff1a\u95ee\u9898\u5f88\u53ef\u80fd\u51fa\u5728\u7ba1\u9053\u7684\u65e9\u671f\u9636\u6bb5\u3002\n<ul class=\"wp-block-list\">\n<li><strong>\u68c0\u67e5 <code>Extractor<\/code><\/strong>\uff1a\u8be5\u5a92\u4f53\u5bb9\u5668\u683c\u5f0f\u662f\u5426\u88ab\u652f\u6301\uff1f<sup>11<\/sup><\/li>\n\n\n\n<li><strong>\u68c0\u67e5 <code>MediaCodecSelector<\/code><\/strong>\uff1a\u5f53\u524d\u8bbe\u5907\u4e0a\u662f\u5426\u5b58\u5728\u652f\u6301\u8be5\u97f3\u9891\u7f16\u7801\u683c\u5f0f\u7684\u89e3\u7801\u5668\uff1f<sup>25<\/sup> \u67e5\u770b Logcat \u4e2d\u662f\u5426\u6709 <code>MediaCodec<\/code> \u76f8\u5173\u7684\u9519\u8bef\u65e5\u5fd7\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u64ad\u653e\u5f00\u59cb\u4f46\u6ca1\u6709\u58f0\u97f3<\/strong>\uff1a\u95ee\u9898\u51fa\u5728\u7ba1\u9053\u7684\u540e\u671f\u9636\u6bb5\u3002\u89e3\u7801\u5668\u5de5\u4f5c\u6b63\u5e38\uff0c\u4f46 PCM \u6570\u636e\u5728\u9001\u5f80\u786c\u4ef6\u7684\u9014\u4e2d\u4e22\u5931\u4e86\u3002\n<ul class=\"wp-block-list\">\n<li><strong>\u68c0\u67e5 <code>AudioSink<\/code><\/strong>\uff1aLogcat \u4e2d\u662f\u5426\u6709 <code>AudioSink error<\/code> \u6216 <code>AudioTrack init failed<\/code> \u7684\u65e5\u5fd7\uff1f<sup>32<\/sup><\/li>\n\n\n\n<li><strong>\u68c0\u67e5 <code>AudioProcessor<\/code><\/strong>\uff1a\u5982\u679c\u4f7f\u7528\u4e86\u81ea\u5b9a\u4e49\u7684 <code>AudioProcessor<\/code>\uff0c\u5b83\u662f\u5426\u53ef\u80fd\u610f\u5916\u5730\u4e22\u5f03\u4e86\u6240\u6709\u7f13\u51b2\u533a\uff0c\u6216\u8005\u8f93\u51fa\u4e86\u9759\u97f3\uff1f<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u64ad\u653e\u5361\u987f\u6216\u51fa\u73b0\u6742\u97f3<\/strong>\uff1a\u8fd9\u901a\u5e38\u4e0e\u6027\u80fd\u6216\u6570\u636e\u4f9b\u7ed9\u6709\u5173\u3002\n<ul class=\"wp-block-list\">\n<li><strong>\u68c0\u67e5 <code>LoadControl<\/code><\/strong>\uff1a\u662f\u5426\u662f\u7f51\u7edc\u95ee\u9898\u5bfc\u81f4\u7f13\u51b2\u4e0d\u8db3\uff1f<\/li>\n\n\n\n<li><strong>\u68c0\u67e5\u89e3\u7801\u5668\u6027\u80fd<\/strong>\uff1a\u662f\u5426\u56e0\u4e3a\u786c\u4ef6\u89e3\u7801\u5668\u5931\u8d25\uff0c\u56de\u9000\u5230\u4e86\u6027\u80fd\u8f83\u5dee\u7684\u8f6f\u4ef6\u89e3\u7801\u5668\uff1f<\/li>\n\n\n\n<li><strong>\u68c0\u67e5 <code>AudioProcessor<\/code><\/strong>\uff1a\u81ea\u5b9a\u4e49\u7684 <code>AudioProcessor<\/code> 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11\u3002\u5f00\u53d1&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[58,64,65],"class_list":["post-520","post","type-post","status-publish","format-standard","hentry","category-appdev","tag-android","tag-exoplayer","tag-media3"],"_links":{"self":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/520","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=520"}],"version-history":[{"count":1,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/520\/revisions"}],"predecessor-version":[{"id":521,"href":"https:\/\/trantor.ink\/index.php?rest_route=\/wp\/v2\/posts\/520\/revisions\/521"}],"wp:attachment":[{"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=520"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=520"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/trantor.ink\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=520"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}