{"id":553779,"date":"2022-02-02T06:26:21","date_gmt":"2022-02-01T22:26:21","guid":{"rendered":"http:\/\/4563.org\/?p=553779"},"modified":"2022-02-02T06:26:21","modified_gmt":"2022-02-01T22:26:21","slug":"ffmpeg-%e8%b0%83%e7%94%a8-mediacodec-%e7%a1%ac%e8%a7%a3%e7%a0%81%e5%88%b0-surface-%e4%b8%8a-6","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=553779","title":{"rendered":"FFmpeg \u8c03\u7528 MediaCodec \u786c\u89e3\u7801\u5230 Surface \u4e0a"},"content":{"rendered":"
\n
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FFmpeg \u8c03\u7528 MediaCodec \u786c\u89e3\u7801\u5230 Surface \u4e0a <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : glumess <\/span> <\/i> 31<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u539f\u6587\u94fe\u63a5\uff1a https:\/\/glumes.com\/post\/ffmpeg\/ffmpeg-call-mediacodec-deocde-to-surface\/<\/p>\n

\u8fd9\u662f\u5173\u4e8e FFmpeg \u548c MediaCodec \u7231\u6068\u60c5\u4ec7\u7cfb\u5217\u7684\u7b2c\u4e09\u7bc7\u6587\u7ae0\u4e86\u3002<\/p>\n

\u4e4b\u524d\u5199\u4e86 FFmpeg \u8c03\u7528 MediaCodec \u8fdb\u884c\u786c\u89e3\u7801\u7684\u5185\u5bb9\u3002<\/p>\n

    \n
  • FFmpeg \u8c03\u7528 Android MediaCodec \u8fdb\u884c\u786c\u89e3\u7801<\/li>\n<\/ul>\n

    \u53e6\u5916\u4e5f\u7ed9\u51fa\u4e86 FFmpeg \u7684\u7f16\u8bd1\u811a\u672c\uff0c\u8f7b\u677e\u641e\u5b9a\u7f16\u8bd1\u95ee\u9898\u3002<\/p>\n

      \n
    • \u8001\u751f\u5e38\u8c08-FFmpeg \u7684\u7f16\u8bd1\u95ee\u9898\u8f7b\u677e\u641e\u5b9a<\/li>\n<\/ul>\n

      \u4f17\u6240\u5468\u77e5\uff0cMediaCodec \u7684\u89e3\u7801\u80fd\u529b\u4e0d\u4ec5\u53ef\u4ee5\u89e3\u7801\u51fa YUV \u6570\u636e\uff0c\u8fd8\u80fd\u76f4\u63a5\u89e3\u7801\u5230 Surface \u4e0a\u3002<\/p>\n

      \u5728\u77ed\u89c6\u9891\u9886\u57df\u4e2d\uff0cMediaCodec \u89e3\u7801\u5230 Surface \u4e0a\u7684\u80fd\u529b\u53cd\u800c\u66f4\u52a0\u5e38\u7528\uff0c\u8fd9\u6837\u5c31\u80fd\u5c06\u753b\u9762\u8f6c\u5230 OES \u7eb9\u7406\u4e0a\uff0c\u4ece\u800c\u8fdb\u884c\u540e\u7eed\u5404\u79cd\u6e32\u67d3\u64cd\u4f5c\u3002<\/p>\n

      \u4e4b\u524d\u4ecb\u7ecd\u7684 FFmpeg \u8c03\u7528 MediaCodec \u8fdb\u884c\u786c\u89e3\u7801\u53ea\u662f\u89e3\u7801\u51fa\u4e86 Buffer \u6570\u636e\uff0c\u6ca1\u6709\u628a\u89e3\u7801\u5230 Surface \u4e0a\u7684\u80fd\u529b\u7528\u8d77\u6765\u3002<\/p>\n

      \u518d\u770b\u4e86\u66f4\u591a\u8d44\u6599\u4e4b\u540e\uff0c\u53d1\u73b0 FFmpeg \u8c03\u7528 MediaCodec \u5df2\u7ecf\u53ef\u4ee5\u89e3\u7801\u5230 Surface \u4e0a\u3002<\/p>\n

      \u5177\u4f53\u53c2\u8003\u7684\u662f\u8fd9\u7bc7\u90ae\u4ef6\u5185\u5bb9\uff1a<\/p>\n

      http:\/\/mplayerhq.hu\/pipermail\/ffmpeg-devel\/2016-March\/191700.html<\/p>\n

      \u5728\u8fd9\u91cc\u9762\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u8fd9\u79cd\u80fd\u529b\uff0c\u6311\u91cd\u70b9\u622a\u56fe\u4e00\u4e0b\uff1a<\/p>\n

      \"FFmpeg<\/p>\n

      \u56fe\u7247\u5185\u5bb9\u4ecb\u7ecd\u7684\u5f88\u8be6\u7ec6\uff0c\u6309\u7167\u6b65\u9aa4\u5b9e\u8df5\u5c31\u597d\u4e86\u3002<\/p>\n

      \u4ee3\u7801\u5b9e\u8df5<\/h3>\n
      \n

      \u5982\u679c\u719f\u6089\u4e86 FFmpeg \u8c03\u7528 MediaCodec \u89e3\u7801 Buffer \u6570\u636e\u7684\u6d41\u7a0b\uff0c\u90a3\u4e48\u89e3\u7801\u5230 Surface \u53ea\u662f\u5728\u6d41\u7a0b\u4e0a\u7a0d\u5fae\u6539\u52a8\u4e00\u70b9\u5c31\u884c\u3002<\/p>\n<\/blockquote>\n

      \u9996\u5148\u8981\u51c6\u5907\u597d Surface \u5bf9\u8c61\uff0c\u5728 Java \u4e0a\u5c42\u6784\u5efa\u597d Surface \u5bf9\u8c61\u901a\u8fc7 NDK \u4f20\u5230 Native \u5c42\uff0c\u4f20\u4e0b\u6765\u7684\u662f\u4e00\u4e2a jobject \u5bf9\u8c61\u3002<\/p>\n

      \u5982\u679c\u4e0d\u719f\u6089 NDK \u7684\u8bdd\uff0c\u53ef\u4ee5\u770b\u770b\u6211\u5728\u6155\u8bfe\u7f51\u4e0a\u7684\u5f55\u5236\u7684\u514d\u8d39\u8bfe\u7a0b\uff1a<\/p>\n

      Android NDK \u514d\u8d39\u89c6\u9891\u5728\u7ebf\u5b66\u4e60\uff01\uff01\uff01<\/p>\n

      \u5176\u6b21\u662f\u4e24\u4e2a\u65b0\u7684\u51fd\u6570\u65b9\u6cd5\uff1a<\/p>\n

      \"FFmpeg<\/p>\n

      av_mediacodec_alloc_context \u548c av_mediacodec_default_init \u65b9\u6cd5\u5c31\u662f\u8ba9 Surface \u548c AVMediaCodecContext \u3001AVCodecContext \u4e09\u8005\u4e4b\u95f4\u4ea7\u751f\u5173\u8054\u3002<\/p>\n

      \u5177\u4f53\u5c31\u662f AVCodecContext \u6301\u6709 AVMediaCodecContext \uff0cAVMediaCodecContext \u6301\u6709 Surface \u3002<\/p>\n

      \u81f3\u4e8e\u4e3a\u4ec0\u4e48\u8981\u5173\u8054\uff0c\u56e0\u4e3a\u5728 FFmpeg \u6e90\u7801\u91cc\u8981\u6839\u636e Surface \u662f\u5426\u4e3a nullptr \u5bf9 MediaCodec \u7684\u521d\u59cb\u5316\u548c\u89e3\u7801\u540e\u7684\u6570\u636e\u505a\u4e0d\u540c\u5904\u7406\u3002<\/p>\n

      \u611f\u5174\u8da3\u7684\u53ef\u4ee5\u9605\u8bfb\u8fd9\u5757\u7684\u6e90\u7801\uff0c\u5185\u5bb9\u4e0d\u591a\u901a\u4fd7\u6613\u61c2\u3002<\/p>\n

      \u7b49\u5230\u89e3\u7801\u4e4b\u540e\uff0cFFmpeg \u540c\u6837\u4f1a\u8fd4\u56de\u4e00\u4e2a AVFrame \u6570\u636e\uff0c\u53ea\u4e0d\u8fc7\u5b83\u7684 data \u5b57\u6bb5\u4e0d\u518d\u662f Buffer \u5185\u5bb9\u4e86\u3002<\/p>\n

      AVFrame \u7684\u683c\u5f0f\u4e0d\u518d\u662f NV12 \uff08\u89e3\u7801 Buffer \u6570\u636e\u7684\u8bdd\u5c31\u662f NV12 \uff09\uff0c\u800c\u662f\u81ea\u5b9a\u4e49\u7684 AV_PIX_FMT_MEDIACODEC \uff0c\u4ee3\u8868\u8d70\u7684 Surface \u6a21\u5f0f\u3002<\/p>\n

      if (s->surface) {    \/\/ surface \u4e0d\u4e3a null \u7684\u60c5\u51b5\u4e0b\uff1a    \/\/ \u901a\u8fc7 mediacodec_wrap_hw_buffer \u5bf9\u6570\u636e\u8fdb\u884c\u5904\u7406 \u00a0 if ((ret = mediacodec_wrap_hw_buffer(avctx, s, index, &info, frame)) < 0) { \u00a0   av_log(avctx, AV_LOG_ERROR, \"Failed to wrap MediaCodec buffern\"); \u00a0 \u00a0 \u00a0 \u00a0return ret; \u00a0 } } <\/code><\/pre>\n
      Surface \u6a21\u5f0f\u4e0b\u5bf9\u6570\u636e\u7684\u5904\u7406\u662f mediacodec_wrap_hw_buffer \u51fd\u6570\uff0cBuffer \u6a21\u5f0f\u5c31\u662f mediacodec_wrap_sw_buffer \u51fd\u6570\u4e86\u3002<\/p>\n
      \u540c\u65f6\uff0c\u771f\u6b63\u89e3\u7801\u540e\u7684\u6570\u636e\u5b58\u50a8\u5728 AVFrame->data[3] \u5b57\u6bb5\u4e0a\uff0c\u8fd9\u4e2a\u5b57\u6bb5\u662f\u4e2a\u8001\u5458\u5de5\u4e86\u3002<\/p>\n
      \u4e00\u822c\u89e3\u7801\u975e Buffer \u6570\u636e\u7684\u60c5\u51b5\uff0c\u90fd\u4f1a\u5c06\u7279\u6b8a\u7684\u5185\u5bb9\u4fdd\u5b58\u5230 data[3] \u4e0a\uff0c\u6bd4\u5982 Window \u4e0a\u7684\u786c\u89e3\uff0c\u90e8\u5206\u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n
      static int mediacodec_wrap_hw_buffer(AVCodecContext *avctx, \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 MediaCodecDecContext *s, \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ssize_t index, \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 FFAMediaCodecBufferInfo *info, \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 AVFrame *frame) \/\/ \u7701\u7565\u90e8\u5206\u6e90\u7801 \/\/ \u521b\u5efa   AVMediaCodecBuffer \u5bf9\u8c61 buffer = av_mallocz(sizeof(AVMediaCodecBuffer)); frame->buf[0] = av_buffer_create(NULL, \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a00, \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0mediacodec_buffer_release, \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0buffer, \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0AV_BUFFER_FLAG_READONLY); \/\/ buffer \u76f8\u5173\u5c5e\u6027\u8d4b\u503c buffer->ctx = s; buffer->serial = atomic_load(&s->serial); if (s->delay_flush) \u00a0 \u00a0 ff_mediacodec_dec_ref(s); \/\/ index \u7d22\u5f15\uff0c\u4ee3\u8868 mediacodec \u4e2d buffer \u7684\u7d22\u5f15 buffer->index = index; buffer->pts = info->presentationTimeUs; \/\/ \u5c06 buffer \u8d4b\u503c\u7ed9 data[3] \u5b57\u6bb5 frame->data[3] = (uint8_t *)buffer; <\/code><\/pre>\n
      \u6709\u4e86 AVFrame \u6570\u636e\u4e4b\u540e\uff0cSurface \u4e0a\u8fd8\u662f\u6ca1\u6709\u753b\u9762\u3002<\/p>\n
      \u56de\u60f3\u4e00\u4e0b\uff0c\u5728 MediaCodec \u4e0a\u60f3\u8981\u6570\u636e\u6e32\u67d3\u5230 Surface \u8fd8\u5f97\u8c03\u7528\u4e00\u4e2a releaseOutputBuffer \u65b9\u6cd5\uff0c\u5176\u4e2d\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8981\u4f20 true \u624d\u53ef\u4ee5\u3002<\/p>\n
      public void releaseOutputBuffer (int index, boolean render) <\/code><\/pre>\n
      \u540c\u6837\uff0c\u5728 FFmpeg \u4e2d\u4e5f\u6709\u8fd9\u4e48\u4e2a\u65b9\u6cd5\u3002<\/p>\n
      int av_mediacodec_release_buffer(AVMediaCodecBuffer *buffer, int render); <\/code><\/pre>\n
      buffer \u5c31\u662f frame->data[3] \u7684\u5185\u5bb9\uff0crender \u7684\u542b\u4e49\u548c releaseOutputBuffer \u4e2d\u7684\u542b\u4e49\u4e00\u81f4\u3002<\/p>\n
      \u53e6\u5916 releaseOutputBuffer \u65b9\u6cd5\u7b2c\u4e00\u4e2a\u53c2\u6570 index \u5176\u5b9e\u5c31\u5df2\u7ecf\u5728 buffer \u4e2d\u8d4b\u503c\u8fc7\u4e86\u3002<\/p>\n
      \u8fd9\u6837\u4e00\u6765\uff0c\u89e3\u7801\u540e\u5c31\u53ef\u4ee5\u76f4\u63a5\u4e0a\u5c4f\u6e32\u67d3\u5c55\u793a\u5566\u3002<\/p>\n
       AVMediaCodecBuffer *buffer = (AVMediaCodecBuffer *) frame->data[3];  av_mediacodec_release_buffer(buffer, 1); <\/code><\/pre>\n
      \u5b8c\u6574\u4ee3\u7801\u5b9e\u8df5\u53ef\u4ee5\u5728\u516c\u4f17\u53f7 \u97f3\u89c6\u9891\u5f00\u53d1\u8fdb\u9636 \u56de\u590d 1019 \u83b7\u53d6\u3002<\/p>\n
      \u7ecf\u8fc7\u6d4b\u8bd5\u9a8c\u8bc1\u786e\u5b9e\u53ef\u884c\uff0c\u4e0d\u8fc7\u76f4\u63a5\u4e0d\u65ad\u89e3\u7801\u4e0a\u5c4f\u7684\u901f\u5ea6\u662f\u5f88\u5feb\u7684\uff0c\u53ef\u4e0d\u6b62\u89c6\u9891\u64ad\u653e 30ms \u4e00\u5e27\u7684\u901f\u5ea6\u54e6\uff0c\u60f3\u8981\u6765\u505a\u64ad\u653e\u5668\u7684\u8bdd\uff0c\u8fd8\u5f97\u81ea\u5df1\u7ba1\u7406\u63a7\u5236\u4e00\u4e0b\u4e86\u3002<\/p>\n
      \u53e6\u5916\uff0c\u5b8c\u6574\u4ee3\u7801\u6f14\u793a\u4e2d\u76f4\u63a5\u89e3\u7801\u5230\u4e86 SurfaceView \u7684 Surface \u4e0a\u3002<\/p>\n
      \u9664\u6b64\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u89e3\u7801\u5230 SurfaceTexture \u6784\u9020\u7684 Surface \u4e0a\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u7528\u5230 SurfaceTexture \u7684 OnFrameAvailableListener \u56de\u8c03\u65b9\u6cd5\uff0c \u5e76\u4e14\u8fd8\u53ef\u4ee5\u7528 attachToGLContext \u65b9\u6cd5\u5173\u8054\u5230 OpenGL \u73af\u5883\u4e0a\uff0c\u6bcf\u6b21\u89e3\u7801\u65f6\u901a\u8fc7 updateTexImage \u66f4\u65b0\u753b\u9762\uff0c\u5b9e\u73b0\u89e3\u7801\u5230 OES \u7eb9\u7406\u7684\u76ee\u6807\uff0c\u5177\u4f53\u64cd\u4f5c\u8d77\u6765\u4e5f\u662f\u5f88\u5bb9\u6613\u65b9\u4fbf\u3002<\/p>\n<\/p><\/div>\n
       \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (0<\/span>) <\/div>\n
       <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
        \n
      • \n","protected":false},"excerpt":{"rendered":"
        FFmpeg \u8c03\u7528 MediaCo…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/553779"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=553779"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/553779\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=553779"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=553779"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=553779"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}