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<td class='lines'><pre><code><span class="hl com">/* SPDX-License-Identifier: LGPL-2.1-or-later */</span>
<span class="hl com">/*</span>
<span class="hl com"> * Copyright (C) 2020, Google Inc.</span>
<span class="hl com"> *</span>
<span class="hl com"> * encoder_libjpeg.cpp - JPEG encoding using libjpeg native API</span>
<span class="hl com"> */</span>

<span class="hl ppc">#include</span> <span class="hl pps">&quot;encoder_libjpeg.h&quot;</span><span class="hl ppc"></span>

<span class="hl ppc">#include &lt;fcntl.h&gt;</span>
<span class="hl ppc">#include &lt;iomanip&gt;</span>
<span class="hl ppc">#include &lt;iostream&gt;</span>
<span class="hl ppc">#include &lt;sstream&gt;</span>
<span class="hl ppc">#include &lt;string.h&gt;</span>
<span class="hl ppc">#include &lt;sys/mman.h&gt;</span>
<span class="hl ppc">#include &lt;unistd.h&gt;</span>
<span class="hl ppc">#include &lt;vector&gt;</span>

<span class="hl ppc">#include &lt;libcamera/camera.h&gt;</span>
<span class="hl ppc">#include &lt;libcamera/formats.h&gt;</span>
<span class="hl ppc">#include &lt;libcamera/pixel_format.h&gt;</span>

<span class="hl ppc">#include</span> <span class="hl pps">&quot;libcamera/internal/formats.h&quot;</span><span class="hl ppc"></span>
<span class="hl ppc">#include</span> <span class="hl pps">&quot;libcamera/internal/log.h&quot;</span><span class="hl ppc"></span>

<span class="hl kwa">using namespace</span> libcamera<span class="hl opt">;</span>

<span class="hl kwd">LOG_DECLARE_CATEGORY</span><span class="hl opt">(</span>JPEG<span class="hl opt">)</span>

<span class="hl kwa">namespace</span> <span class="hl opt">{</span>

<span class="hl kwb">struct</span> JPEGPixelFormatInfo <span class="hl opt">{</span>
	J_COLOR_SPACE colorSpace<span class="hl opt">;</span>
	<span class="hl kwb">const</span> PixelFormatInfo <span class="hl opt">&amp;</span>pixelFormatInfo<span class="hl opt">;</span>
	<span class="hl kwb">bool</span> nvSwap<span class="hl opt">;</span>
<span class="hl opt">};</span>

<span class="hl kwb">const</span> <span class="hl kwc">std</span><span class="hl opt">::</span>map<span class="hl opt">&lt;</span>PixelFormat<span class="hl opt">,</span> JPEGPixelFormatInfo<span class="hl opt">&gt;</span> pixelInfo<span class="hl opt">{</span>
	<span class="hl opt">{</span> <span class="hl kwc">formats</span><span class="hl opt">::</span>R8<span class="hl opt">, {</span> JCS_GRAYSCALE<span class="hl opt">,</span> <span class="hl kwc">PixelFormatInfo</span><span class="hl opt">::</span><span class="hl kwd">info</span><span class="hl opt">(</span><span class="hl kwc">formats</span><span class="hl opt">::</span>R8<span class="hl opt">),</span> <span class="hl kwa">false</span> <span class="hl opt">} },</span>

	<span class="hl opt">{</span> <span class="hl kwc">formats</span><span class="hl opt">::</span>RGB888<span class="hl opt">, {</span> JCS_EXT_BGR<span class="hl opt">,</span> <span class="hl kwc">PixelFormatInfo</span><span class="hl opt">::</span><span class="hl kwd">info</span><span class="hl opt">(</span><span class="hl kwc">formats</span><span class="hl opt">::</span>RGB888<span class="hl opt">),</span> <span class="hl kwa">false</span> <span class="hl opt">} },</span>
	<span class="hl opt">{</span> <span class="hl kwc">formats</span><span class="hl opt">::</span>BGR888<span class="hl opt">, {</span> JCS_EXT_RGB<span class="hl opt">,</span> <span class="hl kwc">PixelFormatInfo</span><span class="hl opt">::</span><span class="hl kwd">info</span><span class="hl opt">(</span><span class="hl kwc">formats</span><span class="hl opt">::</span>BGR888<span class="hl opt">),</span> <span class="hl kwa">false</span> <span class="hl opt">} },</span>

	<span class="hl opt">{</span> <span class="hl kwc">formats</span><span class="hl opt">::</span>NV12<span class="hl opt">, {</span> JCS_YCbCr<span class="hl opt">,</span> <span class="hl kwc">PixelFormatInfo</span><span class="hl opt">::</span><span class="hl kwd">info</span><span class="hl opt">(</span><span class="hl kwc">formats</span><span class="hl opt">::</span>NV12<span class="hl opt">),</span> <span class="hl kwa">false</span> <span class="hl opt">} },</span>
	<span class="hl opt">{</span> <span class="hl kwc">formats</span><span class="hl opt">::</span>NV21<span class="hl opt">, {</span> JCS_YCbCr<span class="hl opt">,</span> <span class="hl kwc">PixelFormatInfo</span><span class="hl opt">::</span><span class="hl kwd">info</span><span class="hl opt">(</span><span class="hl kwc">formats</span><span class="hl opt">::</span>NV21<span class="hl opt">),</span> <span class="hl kwa">true</span> <span class="hl opt">} },</span>
	<span class="hl opt">{</span> <span class="hl kwc">formats</span><span class="hl opt">::</span>NV16<span class="hl opt">, {</span> JCS_YCbCr<span class="hl opt">,</span> <span class="hl kwc">PixelFormatInfo</span><span class="hl opt">::</span><span class="hl kwd">info</span><span class="hl opt">(</span><span class="hl kwc">formats</span><span class="hl opt">::</span>NV16<span class="hl opt">),</span> <span class="hl kwa">false</span> <span class="hl opt">} },</span>
	<span class="hl opt">{</span> <span class="hl kwc">formats</span><span class="hl opt">::</span>NV61<span class="hl opt">, {</span> JCS_YCbCr<span class="hl opt">,</span> <span class="hl kwc">PixelFormatInfo</span><span class="hl opt">::</span><span class="hl kwd">info</span><span class="hl opt">(</span><span class="hl kwc">formats</span><span class="hl opt">::</span>NV61<span class="hl opt">),</span> <span class="hl kwa">true</span> <span class="hl opt">} },</span>
	<span class="hl opt">{</span> <span class="hl kwc">formats</span><span class="hl opt">::</span>NV24<span class="hl opt">, {</span> JCS_YCbCr<span class="hl opt">,</span> <span class="hl kwc">PixelFormatInfo</span><span class="hl opt">::</span><span class="hl kwd">info</span><span class="hl opt">(</span><span class="hl kwc">formats</span><span class="hl opt">::</span>NV24<span class="hl opt">),</span> <span class="hl kwa">false</span> <span class="hl opt">} },</span>
	<span class="hl opt">{</span> <span class="hl kwc">formats</span><span class="hl opt">::</span>NV42<span class="hl opt">, {</span> JCS_YCbCr<span class="hl opt">,</span> <span class="hl kwc">PixelFormatInfo</span><span class="hl opt">::</span><span class="hl kwd">info</span><span class="hl opt">(</span><span class="hl kwc">formats</span><span class="hl opt">::</span>NV42<span class="hl opt">),</span> <span class="hl kwa">true</span> <span class="hl opt">} },</span>
<span class="hl opt">};</span>

<span class="hl kwb">const struct</span> JPEGPixelFormatInfo <span class="hl opt">&amp;</span><span class="hl kwd">findPixelInfo</span><span class="hl opt">(</span><span class="hl kwb">const</span> PixelFormat <span class="hl opt">&amp;</span>format<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwb">static const struct</span> JPEGPixelFormatInfo invalidPixelFormat <span class="hl opt">{</span>
		JCS_UNKNOWN<span class="hl opt">,</span> <span class="hl kwd">PixelFormatInfo</span><span class="hl opt">(),</span> <span class="hl kwa">false</span>
	<span class="hl opt">};</span>

	<span class="hl kwb">const</span> <span class="hl kwc">auto</span> iter <span class="hl opt">=</span> pixelInfo<span class="hl opt">.</span><span class="hl kwd">find</span><span class="hl opt">(</span>format<span class="hl opt">);</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>iter <span class="hl opt">==</span> pixelInfo<span class="hl opt">.</span><span class="hl kwd">end</span><span class="hl opt">()) {</span>
		<span class="hl kwd">LOG</span><span class="hl opt">(</span>JPEG<span class="hl opt">,</span> Error<span class="hl opt">) &lt;&lt;</span> <span class="hl str">&quot;Unsupported pixel format for JPEG encoder: &quot;</span>
				 <span class="hl opt">&lt;&lt;</span> format<span class="hl opt">.</span><span class="hl kwd">toString</span><span class="hl opt">();</span>
		<span class="hl kwa">return</span> invalidPixelFormat<span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl kwa">return</span> iter<span class="hl opt">-&gt;</span>second<span class="hl opt">;</span>
<span class="hl opt">}</span>

<span class="hl opt">}</span> <span class="hl com">/* namespace */</span>

<span class="hl kwc">EncoderLibJpeg</span><span class="hl opt">::</span><span class="hl kwd">EncoderLibJpeg</span><span class="hl opt">()</span>
	<span class="hl opt">:</span> <span class="hl kwd">quality_</span><span class="hl opt">(</span><span class="hl num">95</span><span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl com">/* \todo Expand error handling coverage with a custom handler. */</span>
	compress_<span class="hl opt">.</span>err <span class="hl opt">=</span> <span class="hl kwd">jpeg_std_error</span><span class="hl opt">(&amp;</span>jerr_<span class="hl opt">);</span>

	<span class="hl kwd">jpeg_create_compress</span><span class="hl opt">(&amp;</span>compress_<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwc">EncoderLibJpeg</span><span class="hl opt">::~</span><span class="hl kwd">EncoderLibJpeg</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwd">jpeg_destroy_compress</span><span class="hl opt">(&amp;</span>compress_<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">int</span> <span class="hl kwc">EncoderLibJpeg</span><span class="hl opt">::</span><span class="hl kwd">configure</span><span class="hl opt">(</span><span class="hl kwb">const</span> StreamConfiguration <span class="hl opt">&amp;</span>cfg<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwb">const struct</span> JPEGPixelFormatInfo info <span class="hl opt">=</span> <span class="hl kwd">findPixelInfo</span><span class="hl opt">(</span>cfg<span class="hl opt">.</span>pixelFormat<span class="hl opt">);</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>info<span class="hl opt">.</span>colorSpace <span class="hl opt">==</span> JCS_UNKNOWN<span class="hl opt">)</span>
		<span class="hl kwa">return</span> <span class="hl opt">-</span>ENOTSUP<span class="hl opt">;</span>

	compress_<span class="hl opt">.</span>image_width <span class="hl opt">=</span> cfg<span class="hl opt">.</span>size<span class="hl opt">.</span>width<span class="hl opt">;</span>
	compress_<span class="hl opt">.</span>image_height <span class="hl opt">=</span> cfg<span class="hl opt">.</span>size<span class="hl opt">.</span>height<span class="hl opt">;</span>
	compress_<span class="hl opt">.</span>in_color_space <span class="hl opt">=</span> info<span class="hl opt">.</span>colorSpace<span class="hl opt">;</span>

	compress_<span class="hl opt">.</span>input_components <span class="hl opt">=</span> info<span class="hl opt">.</span>colorSpace <span class="hl opt">==</span> JCS_GRAYSCALE <span class="hl opt">?</span> <span class="hl num">1</span> <span class="hl opt">:</span> <span class="hl num">3</span><span class="hl opt">;</span>

	<span class="hl kwd">jpeg_set_defaults</span><span class="hl opt">(&amp;</span>compress_<span class="hl opt">);</span>
	<span class="hl kwd">jpeg_set_quality</span><span class="hl opt">(&amp;</span>compress_<span class="hl opt">,</span> quality_<span class="hl opt">,</span> TRUE<span class="hl opt">);</span>

	pixelFormatInfo_ <span class="hl opt">= &amp;</span>info<span class="hl opt">.</span>pixelFormatInfo<span class="hl opt">;</span>

	nv_ <span class="hl opt">=</span> pixelFormatInfo_<span class="hl opt">-&gt;</span><span class="hl kwd">numPlanes</span><span class="hl opt">() ==</span> <span class="hl num">2</span><span class="hl opt">;</span>
	nvSwap_ <span class="hl opt">=</span> info<span class="hl opt">.</span>nvSwap<span class="hl opt">;</span>

	<span class="hl kwa">return</span> <span class="hl num">0</span><span class="hl opt">;</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">EncoderLibJpeg</span><span class="hl opt">::</span><span class="hl kwd">compressRGB</span><span class="hl opt">(</span><span class="hl kwb">const</span> <span class="hl kwc">libcamera</span><span class="hl opt">::</span>MappedBuffer <span class="hl opt">*</span>frame<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwb">unsigned char</span> <span class="hl opt">*</span>src <span class="hl opt">=</span> <span class="hl kwa">static_cast</span><span class="hl opt">&lt;</span><span class="hl kwb">unsigned char</span> <span class="hl opt">*&gt;(</span>frame<span class="hl opt">-&gt;</span><span class="hl kwd">maps</span><span class="hl opt">()[</span><span class="hl num">0</span><span class="hl opt">].</span><span class="hl kwd">data</span><span class="hl opt">());</span>
	<span class="hl com">/* \todo Stride information should come from buffer configuration. */</span>
	<span class="hl kwb">unsigned int</span> stride <span class="hl opt">=</span> pixelFormatInfo_<span class="hl opt">-&gt;</span><span class="hl kwd">stride</span><span class="hl opt">(</span>compress_<span class="hl opt">.</span>image_width<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">);</span>

	JSAMPROW row_pointer<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">];</span>

	<span class="hl kwa">while</span> <span class="hl opt">(</span>compress_<span class="hl opt">.</span>next_scanline <span class="hl opt">&lt;</span> compress_<span class="hl opt">.</span>image_height<span class="hl opt">) {</span>
		row_pointer<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">] = &amp;</span>src<span class="hl opt">[</span>compress_<span class="hl opt">.</span>next_scanline <span class="hl opt">*</span> stride<span class="hl opt">];</span>
		<span class="hl kwd">jpeg_write_scanlines</span><span class="hl opt">(&amp;</span>compress_<span class="hl opt">,</span> row_pointer<span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">);</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>

<span class="hl com">/*</span>
<span class="hl com"> * Compress the incoming buffer from a supported NV format.</span>
<span class="hl com"> * This naively unpacks the semi-planar NV12 to a YUV888 format for libjpeg.</span>
<span class="hl com"> */</span>
<span class="hl kwb">void</span> <span class="hl kwc">EncoderLibJpeg</span><span class="hl opt">::</span><span class="hl kwd">compressNV</span><span class="hl opt">(</span><span class="hl kwb">const</span> <span class="hl kwc">libcamera</span><span class="hl opt">::</span>MappedBuffer <span class="hl opt">*</span>frame<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwb">uint8_t</span> tmprowbuf<span class="hl opt">[</span>compress_<span class="hl opt">.</span>image_width <span class="hl opt">*</span> <span class="hl num">3</span><span class="hl opt">];</span>

	<span class="hl com">/*</span>
<span class="hl com">	 * \todo Use the raw api, and only unpack the cb/cr samples to new line</span>
<span class="hl com">	 * buffers. If possible, see if we can set appropriate pixel strides</span>
<span class="hl com">	 * too to save even that copy.</span>
<span class="hl com">	 *</span>
<span class="hl com">	 * Possible hints at:</span>
<span class="hl com">	 * https://sourceforge.net/p/libjpeg/mailman/message/30815123/</span>
<span class="hl com">	 */</span>
	<span class="hl kwb">unsigned int</span> y_stride <span class="hl opt">=</span> pixelFormatInfo_<span class="hl opt">-&gt;</span><span class="hl kwd">stride</span><span class="hl opt">(</span>compress_<span class="hl opt">.</span>image_width<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">);</span>
	<span class="hl kwb">unsigned int</span> c_stride <span class="hl opt">=</span> pixelFormatInfo_<span class="hl opt">-&gt;</span><span class="hl kwd">stride</span><span class="hl opt">(</span>compress_<span class="hl opt">.</span>image_width<span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">);</span>

	<span class="hl kwb">unsigned int</span> horzSubSample <span class="hl opt">=</span> <span class="hl num">2</span> <span class="hl opt">*</span> compress_<span class="hl opt">.</span>image_width <span class="hl opt">/</span> c_stride<span class="hl opt">;</span>
	<span class="hl kwb">unsigned int</span> vertSubSample <span class="hl opt">=</span> pixelFormatInfo_<span class="hl opt">-&gt;</span>planes<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">].</span>verticalSubSampling<span class="hl opt">;</span>

	<span class="hl kwb">unsigned int</span> c_inc <span class="hl opt">=</span> horzSubSample <span class="hl opt">==</span> <span class="hl num">1</span> <span class="hl opt">?</span> <span class="hl num">2</span> <span class="hl opt">:</span> <span class="hl num">0</span><span class="hl opt">;</span>
	<span class="hl kwb">unsigned int</span> cb_pos <span class="hl opt">=</span> nvSwap_ <span class="hl opt">?</span> <span class="hl num">1</span> <span class="hl opt">:</span> <span class="hl num">0</span><span class="hl opt">;</span>
	<span class="hl kwb">unsigned int</span> cr_pos <span class="hl opt">=</span> nvSwap_ <span class="hl opt">?</span> <span class="hl num">0</span> <span class="hl opt">:</span> <span class="hl num">1</span><span class="hl opt">;</span>

	<span class="hl kwb">const unsigned char</span> <span class="hl opt">*</span>src <span class="hl opt">=</span> <span class="hl kwa">static_cast</span><span class="hl opt">&lt;</span><span class="hl kwb">unsigned char</span> <span class="hl opt">*&gt;(</span>frame<span class="hl opt">-&gt;</span><span class="hl kwd">maps</span><span class="hl opt">()[</span><span class="hl num">0</span><span class="hl opt">].</span><span class="hl kwd">data</span><span class="hl opt">());</span>
	<span class="hl kwb">const unsigned char</span> <span class="hl opt">*</span>src_c <span class="hl opt">=</span> src <span class="hl opt">+</span> y_stride <span class="hl opt">*</span> compress_<span class="hl opt">.</span>image_height<span class="hl opt">;</span>

	JSAMPROW row_pointer<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">];</span>
	row_pointer<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">] = &amp;</span>tmprowbuf<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">];</span>

	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">unsigned int</span> y <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> y <span class="hl opt">&lt;</span> compress_<span class="hl opt">.</span>image_height<span class="hl opt">;</span> y<span class="hl opt">++) {</span>
		<span class="hl kwb">unsigned char</span> <span class="hl opt">*</span>dst <span class="hl opt">= &amp;</span>tmprowbuf<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">];</span>

		<span class="hl kwb">const unsigned char</span> <span class="hl opt">*</span>src_y <span class="hl opt">=</span> src <span class="hl opt">+</span> y <span class="hl opt">*</span> compress_<span class="hl opt">.</span>image_width<span class="hl opt">;</span>
		<span class="hl kwb">const unsigned char</span> <span class="hl opt">*</span>src_cb <span class="hl opt">=</span> src_c <span class="hl opt">+ (</span>y <span class="hl opt">/</span> vertSubSample<span class="hl opt">) *</span> c_stride <span class="hl opt">+</span> cb_pos<span class="hl opt">;</span>
		<span class="hl kwb">const unsigned char</span> <span class="hl opt">*</span>src_cr <span class="hl opt">=</span> src_c <span class="hl opt">+ (</span>y <span class="hl opt">/</span> vertSubSample<span class="hl opt">) *</span> c_stride <span class="hl opt">+</span> cr_pos<span class="hl opt">;</span>

		<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">unsigned int</span> x <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> x <span class="hl opt">&lt;</span> compress_<span class="hl opt">.</span>image_width<span class="hl opt">;</span> x <span class="hl opt">+=</span> <span class="hl num">2</span><span class="hl opt">) {</span>
			dst<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">] = *</span>src_y<span class="hl opt">;</span>
			dst<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">] = *</span>src_cb<span class="hl opt">;</span>
			dst<span class="hl opt">[</span><span class="hl num">2</span><span class="hl opt">] = *</span>src_cr<span class="hl opt">;</span>
			src_y<span class="hl opt">++;</span>
			src_cb <span class="hl opt">+=</span> c_inc<span class="hl opt">;</span>
			src_cr <span class="hl opt">+=</span> c_inc<span class="hl opt">;</span>
			dst <span class="hl opt">+=</span> <span class="hl num">3</span><span class="hl opt">;</span>

			dst<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">] = *</span>src_y<span class="hl opt">;</span>
			dst<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">] = *</span>src_cb<span class="hl opt">;