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<ul class="current">
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<li class="toctree-l1"><a class="reference internal" href="usbd_cdc_acm.html">usbd_cdc_acm</a></li>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">usbd_video</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/ohci.html">OHCI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/musb.html">MUSB</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/fotg210.html">FOTG210</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/cdns3.html">CDNS3</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../usbip/dwc3.html">DWC3</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../tools/index.html">chryusb_configurator</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../tools/index.html#usb-protocol-suite">力科 USB Protocol Suite</a></li>
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<section id="usbd-video">
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<h1>usbd_video<a class="headerlink" href="#usbd-video" title="Link to this heading"></a></h1>
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<p>本节主要演示 USB UAC 功能，支持 YUYV, MJPEG, H264 格式。为了方便演示，都采用的静态图。</p>
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<p>demo 包含 <strong>video_static_yuyv_template</strong>, <strong>video_static_mjpeg_template</strong>, <strong>video_static_h264_template</strong>, 仅描述符和图片数据不同。</p>
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<ul class="simple">
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<li><p>在高速模式下，默认最大是1024字节，但是如果芯片支持 additional transcations，可以配置为最高 2048字节或者3072字节，这样可以提高传输效率。</p></li>
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</ul>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="cp">#ifdef CONFIG_USB_HS</span>
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<span class="cp">#define MAX_PAYLOAD_SIZE 1024 </span><span class="c1">// for high speed with one transcations every one micro frame</span>
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<span class="cp">#define VIDEO_PACKET_SIZE (unsigned int)(((MAX_PAYLOAD_SIZE / 1)) | (0x00 << 11))</span>
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<span class="c1">// #define MAX_PAYLOAD_SIZE 2048 // for high speed with two transcations every one micro frame</span>
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<span class="c1">// #define VIDEO_PACKET_SIZE (unsigned int)(((MAX_PAYLOAD_SIZE / 2)) | (0x01 << 11))</span>
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<span class="c1">// #define MAX_PAYLOAD_SIZE 3072 // for high speed with three transcations every one micro frame</span>
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<span class="c1">// #define VIDEO_PACKET_SIZE (unsigned int)(((MAX_PAYLOAD_SIZE / 3)) | (0x02 << 11))</span>
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<span class="cp">#else</span>
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<span class="cp">#define MAX_PAYLOAD_SIZE 1020</span>
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<span class="cp">#define VIDEO_PACKET_SIZE (unsigned int)(((MAX_PAYLOAD_SIZE / 1)) | (0x00 << 11))</span>
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<span class="cp">#endif</span>
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</pre></div>
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</div>
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<ul class="simple">
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<li><p>通常只需要修改 WIDTH 和 HEIGHT</p></li>
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</ul>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="cp">#define WIDTH (unsigned int)(640)</span>
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<span class="cp">#define HEIGHT (unsigned int)(480)</span>
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<span class="cp">#define CAM_FPS (30)</span>
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<span class="cp">#define INTERVAL (unsigned long)(10000000 / CAM_FPS)</span>
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<span class="cp">#define MIN_BIT_RATE (unsigned long)(WIDTH * HEIGHT * 16 * CAM_FPS) </span><span class="c1">//16 bit</span>
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<span class="cp">#define MAX_BIT_RATE (unsigned long)(WIDTH * HEIGHT * 16 * CAM_FPS)</span>
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<span class="cp">#define MAX_FRAME_SIZE (unsigned long)(WIDTH * HEIGHT * 2)</span>
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</pre></div>
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</div>
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<ul class="simple">
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<li><p>USB 端点配置，默认 interval 为 1，也就是全速模式下 1ms，高速模式下 125us。同步类型使用异步模式。</p></li>
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</ul>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="cm">/* 1.2.2.2 Standard VideoStream Isochronous Video Data Endpoint Descriptor */</span>
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<span class="n">USB_ENDPOINT_DESCRIPTOR_INIT</span><span class="p">(</span><span class="n">VIDEO_IN_EP</span><span class="p">,</span><span class="w"> </span><span class="mh">0x05</span><span class="p">,</span><span class="w"> </span><span class="n">VIDEO_PACKET_SIZE</span><span class="p">,</span><span class="w"> </span><span class="mh">0x01</span><span class="p">),</span>
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</pre></div>
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</div>
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<ul class="simple">
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<li><p>使用 <cite>usbd_video_stream_start_write</cite> 传输数据, 最后 <strong>do_copy</strong> 选项表示是否将数据 copy 到 packet_buffer,</p></li>
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</ul>
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<p>如果不选择 copy， 则会直接在原图像数据中填充头部信息，并直接发送，达到 zero copy 功能。</p>
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<ul class="simple">
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<li><p>因为提供的是静态数据，不能被修改，因此需要重新给一个 frame_buffer 用于图像传输，在实际对接 camera 场景中是动态数据，直接使用 camera 的数据缓冲区即可。</p></li>
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</ul>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="kt">void</span><span class="w"> </span><span class="nf">usbd_video_iso_callback</span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">busid</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">ep</span><span class="p">,</span><span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">nbytes</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">usbd_video_stream_split_transfer</span><span class="p">(</span><span class="n">busid</span><span class="p">,</span><span class="w"> </span><span class="n">ep</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="cm">/* one frame has done */</span>
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<span class="w"> </span><span class="n">iso_tx_busy</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">false</span><span class="p">;</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="p">}</span>
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<span class="n">USB_NOCACHE_RAM_SECTION</span><span class="w"> </span><span class="n">USB_MEM_ALIGNX</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">packet_buffer</span><span class="p">[</span><span class="n">MAX_PAYLOAD_SIZE</span><span class="p">];</span>
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<span class="n">USB_NOCACHE_RAM_SECTION</span><span class="w"> </span><span class="n">USB_MEM_ALIGNX</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">frame_buffer</span><span class="p">[</span><span class="mi">32</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">1024</span><span class="p">];</span>
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<span class="kt">void</span><span class="w"> </span><span class="nf">video_test</span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">busid</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="w"> </span><span class="n">memset</span><span class="p">(</span><span class="n">packet_buffer</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">packet_buffer</span><span class="p">));</span>
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<span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">tx_flag</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="n">iso_tx_busy</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">true</span><span class="p">;</span>
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<span class="w"> </span><span class="n">memcpy</span><span class="p">(</span><span class="n">frame_buffer</span><span class="p">,</span><span class="w"> </span><span class="n">cherryusb_mjpeg</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">cherryusb_mjpeg</span><span class="p">));</span><span class="w"> </span><span class="c1">// cherryusb_mjpeg is a static MJPEG frame buffer, so we need copy it to frame_buffer</span>
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<span class="w"> </span><span class="n">usbd_video_stream_start_write</span><span class="p">(</span><span class="n">busid</span><span class="p">,</span><span class="w"> </span><span class="n">VIDEO_IN_EP</span><span class="p">,</span><span class="w"> </span><span class="n">packet_buffer</span><span class="p">,</span><span class="w"> </span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="n">frame_buffer</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">cherryusb_mjpeg</span><span class="p">),</span><span class="w"> </span><span class="nb">false</span><span class="p">);</span>
|
||
<span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="n">iso_tx_busy</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">tx_flag</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
|
||
<span class="w"> </span><span class="k">break</span><span class="p">;</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="w"> </span><span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
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