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<div>We have ARGB buffer to be compressed and then decoded also.</div>
<div>But for encoding the data the input as ARGB wasnt accepted.</div>
<div>The data was converted to YUV and then compressed, and on the receive side decoded and then converted back to ARGB.</div>
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<div><b>The problem is that, While this conversion happens colours change.</b></div>
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<div>Following is the code used to convert from ARGB to YUV and YUV to ARGB respectively.</div>
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<div>void <b>ConvertToYUV</b>(int iWidth, int iHeight, BYTE* pARGBBuff)</div>
<div>{<span class="Apple-tab-span" style="white-space:pre"> </span></div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>#define RNDTO2(X) ( ( (X) & 0xFFFFFFFE )</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>#define RNDTO32(X) ( ( (X) % 32 ) ? ( ( (X) + 32 ) & 0xFFFFFFE0 ) : (X) )</div>
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<div><span class="Apple-tab-span" style="white-space:pre"></span>//int ystride = RNDTO32 ( iWidth );</div>
<div> //int uvstride = RNDTO32 ( iWidth / 2 );</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>int ystride = iWidth;</div>
<div> int uvstride = iWidth / 2;</div>
<div> int ysize = ystride * iHeight;</div>
<div> int vusize = uvstride * ( iHeight / 2 );</div>
<div> int size = ysize + ( 2 * vusize );</div>
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<div><span class="Apple-tab-span" style="white-space:pre"></span>if(m_sws_ctx == NULL)</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>{</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>//SwsFilter</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>m_sws_ctx = sws_getContext(iWidth, </div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>iHeight,</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>AV_PIX_FMT_BGRA, </div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>iWidth, iHeight,</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>AV_PIX_FMT_YUV420P, </div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>SWS_FAST_BILINEAR, 0, 0, 0);</div>
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<div><span class="Apple-tab-span" style="white-space:pre"></span>m_picture_buf = (uint8_t*)malloc(size);</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>}<span class="Apple-tab-span" style="white-space:pre">
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<div><span class="Apple-tab-span" style="white-space:pre"></span></div>
<div> //uint8_t *plane[] = { m_picture_buf, m_picture_buf + ysize, m_picture_buf + ysize + vusize};</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>uint8_t *plane[] = { m_picture_buf, m_picture_buf + ysize + vusize, m_picture_buf + ysize};</div>
<div> int stride[] = { ystride, uvstride, uvstride};</div>
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<div><span class="Apple-tab-span" style="white-space:pre"></span>uint8_t *inData[1] = { pARGBBuff };</div>
<div> int inLinesize[1] = { 4 * iWidth}; </div>
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<div> sws_scale(m_sws_ctx, inData, inLinesize, 0, iHeight, plane, stride);<span class="Apple-tab-span" style="white-space:pre">
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<div><span class="Apple-tab-span" style="white-space:pre"></span></div>
<div>}</div>
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<div>void <b>ConvertToARGB</b>(int iWidth, int iHeight)</div>
<div>{<span class="Apple-tab-span" style="white-space:pre"> </span></div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>#define RNDTO2(X) ( ( (X) & 0xFFFFFFFE )</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>#define RNDTO32(X) ( ( (X) % 32 ) ? ( ( (X) + 32 ) & 0xFFFFFFE0 ) : (X) )</div>
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<div><span class="Apple-tab-span" style="white-space:pre"></span>int iSize = iWidth * iHeight * 4;</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>int ystride = RNDTO32 ( iWidth );</div>
<div> int uvstride = RNDTO32 ( iWidth / 2 );<span class="Apple-tab-span" style="white-space:pre">
</span></div>
<div> int ysize = ystride * iHeight;</div>
<div> int vusize = uvstride * ( iHeight / 2 );</div>
<div> </div>
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<div><span class="Apple-tab-span" style="white-space:pre"></span>if(m_sws_ctx == NULL)</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>{</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>//SwsFilter</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>m_sws_ctx = sws_getContext(iWidth, </div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>iHeight,</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>AV_PIX_FMT_YUV420P, </div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>iWidth, iHeight,</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>AV_PIX_FMT_BGRA, </div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>SWS_FAST_BILINEAR, 0, 0, 0);</div>
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<div><span class="Apple-tab-span" style="white-space:pre"></span>m_picture_buf = (uint8_t*)malloc(iSize);</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>}<span class="Apple-tab-span" style="white-space:pre">
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<div><span class="Apple-tab-span" style="white-space:pre"></span>// src<span class="Apple-tab-span" style="white-space:pre">
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<div><span class="Apple-tab-span" style="white-space:pre"></span>int srcstride[] = {ystride, uvstride, uvstride}; </div>
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<div><span class="Apple-tab-span" style="white-space:pre"></span>// dest</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>uint8_t *destplane[] = {m_picture_buf};</div>
<div> int stride[] = { iWidth * 4};<span class="Apple-tab-span" style="white-space:pre">
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<div><span class="Apple-tab-span" style="white-space:pre"></span></div>
<div> int iHeightReturned = sws_scale(m_sws_ctx, m_picture->data, srcstride, 0, iHeight, destplane, stride);<span class="Apple-tab-span" style="white-space:pre">
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<div> </div>
<div><b> <span style="font-size: 13.3333330154419px;">m_picture is the output of </span><span style="font-size: 10pt;">avcodec_decode_video2.</span></b><span class="Apple-tab-span" style="font-size: 10pt; white-space: pre;">
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<div>}</div>
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<div>What correction needs to be done in the code, so that colours remain intact.</div>
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<div>Thanks and regards</div>
<div>Jasleen</div>
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