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<h1>Forcing A Keyframe</h1>
<p>This is an example demonstrating how to control placement of keyframes
on a frame-by-frame basis.</p>
<h2>Configuration</h2>
<p>Keyframes can be forced by setting the VPX_EFLAG_FORCE_KF bit of the
flags passed to <code>vpx_codec_control()</code>. In this example, we force a
keyframe every 8 frames.</p>
<pre class="c"><span style="color: #b1b100;">if</span><span style="color: #009900;">(</span><span style="color: #339933;">!</span><span style="color: #009900;">(</span>frame_cnt <span style="color: #339933;">&</span> <span style="color: #0000dd;">7</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span>
flags <span style="color: #339933;">|=</span> VPX_EFLAG_FORCE_KF<span style="color: #339933;">;</span>
<span style="color: #b1b100;">else</span>
flags <span style="color: #339933;">&=</span> ~VPX_EFLAG_FORCE_KF<span style="color: #339933;">;</span></pre>
<h2>Observing The Effects</h2>
<p>The output of the encoder examples shows a ‘K’ rather than a dot ‘.’
when the encoder generates a keyframe. Note that every 8 frames a ‘K’
is output.</p>
<h1>Putting It All Together</h1>
<pre class="c"><span style="color: #808080; font-style: italic;">/*
Copyright (c) 2010 The WebM project authors. All Rights Reserved.
Use of this source code is governed by a BSD-style license
that can be found in the LICENSE file in the root of the source
tree. An additional intellectual property rights grant can be found
in the file PATENTS. All contributing project authors may
be found in the AUTHORS file in the root of the source tree.
*/</span>
<span style="color: #808080; font-style: italic;">/*
This is an example demonstrating how to control placement of keyframes
on a frame-by-frame basis.
*/</span>
<span style="color: #339933;">#include <stdio.h></span>
<span style="color: #339933;">#include <stdlib.h></span>
<span style="color: #339933;">#include <stdarg.h></span>
<span style="color: #339933;">#include <string.h></span>
<span style="color: #339933;">#define VPX_CODEC_DISABLE_COMPAT 1</span>
<span style="color: #339933;">#include "vpx/vpx_encoder.h"</span>
<span style="color: #339933;">#include "vpx/vp8cx.h"</span>
<span style="color: #339933;">#define interface (vpx_codec_vp8_cx())</span>
<span style="color: #339933;">#define fourcc 0x30385056</span>
<span style="color: #339933;">#define IVF_FILE_HDR_SZ (32)</span>
<span style="color: #339933;">#define IVF_FRAME_HDR_SZ (12)</span>
<span style="color: #993333;">static</span> <span style="color: #993333;">void</span> mem_put_le16<span style="color: #009900;">(</span><span style="color: #993333;">char</span> <span style="color: #339933;">*</span>mem<span style="color: #339933;">,</span> <span style="color: #993333;">unsigned</span> <span style="color: #993333;">int</span> val<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
mem<span style="color: #009900;">[</span><span style="color: #0000dd;">0</span><span style="color: #009900;">]</span> <span style="color: #339933;">=</span> val<span style="color: #339933;">;</span>
mem<span style="color: #009900;">[</span><span style="color: #0000dd;">1</span><span style="color: #009900;">]</span> <span style="color: #339933;">=</span> val<span style="color: #339933;">>></span><span style="color: #0000dd;">8</span><span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
<span style="color: #993333;">static</span> <span style="color: #993333;">void</span> mem_put_le32<span style="color: #009900;">(</span><span style="color: #993333;">char</span> <span style="color: #339933;">*</span>mem<span style="color: #339933;">,</span> <span style="color: #993333;">unsigned</span> <span style="color: #993333;">int</span> val<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
mem<span style="color: #009900;">[</span><span style="color: #0000dd;">0</span><span style="color: #009900;">]</span> <span style="color: #339933;">=</span> val<span style="color: #339933;">;</span>
mem<span style="color: #009900;">[</span><span style="color: #0000dd;">1</span><span style="color: #009900;">]</span> <span style="color: #339933;">=</span> val<span style="color: #339933;">>></span><span style="color: #0000dd;">8</span><span style="color: #339933;">;</span>
mem<span style="color: #009900;">[</span><span style="color: #0000dd;">2</span><span style="color: #009900;">]</span> <span style="color: #339933;">=</span> val<span style="color: #339933;">>></span><span style="color: #0000dd;">16</span><span style="color: #339933;">;</span>
mem<span style="color: #009900;">[</span><span style="color: #0000dd;">3</span><span style="color: #009900;">]</span> <span style="color: #339933;">=</span> val<span style="color: #339933;">>></span><span style="color: #0000dd;">24</span><span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
<span style="color: #993333;">static</span> <span style="color: #993333;">void</span> die<span style="color: #009900;">(</span><span style="color: #993333;">const</span> <span style="color: #993333;">char</span> <span style="color: #339933;">*</span>fmt<span style="color: #339933;">,</span> ...<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
va_list ap<span style="color: #339933;">;</span>
va_start<span style="color: #009900;">(</span>ap<span style="color: #339933;">,</span> fmt<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
vprintf<span style="color: #009900;">(</span>fmt<span style="color: #339933;">,</span> ap<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>fmt<span style="color: #009900;">[</span>strlen<span style="color: #009900;">(</span>fmt<span style="color: #009900;">)</span><span style="color: #339933;">-</span><span style="color: #0000dd;">1</span><span style="color: #009900;">]</span> <span style="color: #339933;">!=</span> <span style="color: #ff0000;">'<span style="color: #000099; font-weight: bold;">\n</span>'</span><span style="color: #009900;">)</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/printf.html"><span style="color: #000066;">printf</span></a><span style="color: #009900;">(</span><span style="color: #ff0000;">"<span style="color: #000099; font-weight: bold;">\n</span>"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
exit<span style="color: #009900;">(</span>EXIT_FAILURE<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
<span style="color: #993333;">static</span> <span style="color: #993333;">void</span> die_codec<span style="color: #009900;">(</span>vpx_codec_ctx_t <span style="color: #339933;">*</span>ctx<span style="color: #339933;">,</span> <span style="color: #993333;">const</span> <span style="color: #993333;">char</span> <span style="color: #339933;">*</span>s<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
<span style="color: #993333;">const</span> <span style="color: #993333;">char</span> <span style="color: #339933;">*</span>detail <span style="color: #339933;">=</span> vpx_codec_error_detail<span style="color: #009900;">(</span>ctx<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/printf.html"><span style="color: #000066;">printf</span></a><span style="color: #009900;">(</span><span style="color: #ff0000;">"%s: %s<span style="color: #000099; font-weight: bold;">\n</span>"</span><span style="color: #339933;">,</span> s<span style="color: #339933;">,</span> vpx_codec_error<span style="color: #009900;">(</span>ctx<span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>detail<span style="color: #009900;">)</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/printf.html"><span style="color: #000066;">printf</span></a><span style="color: #009900;">(</span><span style="color: #ff0000;">" %s<span style="color: #000099; font-weight: bold;">\n</span>"</span><span style="color: #339933;">,</span>detail<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
exit<span style="color: #009900;">(</span>EXIT_FAILURE<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
<span style="color: #993333;">static</span> <span style="color: #993333;">int</span> read_frame<span style="color: #009900;">(</span>FILE <span style="color: #339933;">*</span>f<span style="color: #339933;">,</span> vpx_image_t <span style="color: #339933;">*</span>img<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
size_t nbytes<span style="color: #339933;">,</span> to_read<span style="color: #339933;">;</span>
<span style="color: #993333;">int</span> res <span style="color: #339933;">=</span> <span style="color: #0000dd;">1</span><span style="color: #339933;">;</span>
to_read <span style="color: #339933;">=</span> img<span style="color: #339933;">-></span>w<span style="color: #339933;">*</span>img<span style="color: #339933;">-></span>h<span style="color: #339933;">*</span><span style="color: #0000dd;">3</span><span style="color: #339933;">/</span><span style="color: #0000dd;">2</span><span style="color: #339933;">;</span>
nbytes <span style="color: #339933;">=</span> fread<span style="color: #009900;">(</span>img<span style="color: #339933;">-></span>planes<span style="color: #009900;">[</span><span style="color: #0000dd;">0</span><span style="color: #009900;">]</span><span style="color: #339933;">,</span> <span style="color: #0000dd;">1</span><span style="color: #339933;">,</span> to_read<span style="color: #339933;">,</span> f<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>nbytes <span style="color: #339933;">!=</span> to_read<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
res <span style="color: #339933;">=</span> <span style="color: #0000dd;">0</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>nbytes <span style="color: #339933;">></span> <span style="color: #0000dd;">0</span><span style="color: #009900;">)</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/printf.html"><span style="color: #000066;">printf</span></a><span style="color: #009900;">(</span><span style="color: #ff0000;">"Warning: Read partial frame. Check your width & height!<span style="color: #000099; font-weight: bold;">\n</span>"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
<span style="color: #b1b100;">return</span> res<span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
<span style="color: #993333;">static</span> <span style="color: #993333;">void</span> write_ivf_file_header<span style="color: #009900;">(</span>FILE <span style="color: #339933;">*</span>outfile<span style="color: #339933;">,</span>
<span style="color: #993333;">const</span> vpx_codec_enc_cfg_t <span style="color: #339933;">*</span>cfg<span style="color: #339933;">,</span>
<span style="color: #993333;">int</span> frame_cnt<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
<span style="color: #993333;">char</span> header<span style="color: #009900;">[</span><span style="color: #0000dd;">32</span><span style="color: #009900;">]</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>cfg<span style="color: #339933;">-></span>g_pass <span style="color: #339933;">!=</span> VPX_RC_ONE_PASS <span style="color: #339933;">&&</span> cfg<span style="color: #339933;">-></span>g_pass <span style="color: #339933;">!=</span> VPX_RC_LAST_PASS<span style="color: #009900;">)</span>
<span style="color: #b1b100;">return</span><span style="color: #339933;">;</span>
header<span style="color: #009900;">[</span><span style="color: #0000dd;">0</span><span style="color: #009900;">]</span> <span style="color: #339933;">=</span> <span style="color: #ff0000;">'D'</span><span style="color: #339933;">;</span>
header<span style="color: #009900;">[</span><span style="color: #0000dd;">1</span><span style="color: #009900;">]</span> <span style="color: #339933;">=</span> <span style="color: #ff0000;">'K'</span><span style="color: #339933;">;</span>
header<span style="color: #009900;">[</span><span style="color: #0000dd;">2</span><span style="color: #009900;">]</span> <span style="color: #339933;">=</span> <span style="color: #ff0000;">'I'</span><span style="color: #339933;">;</span>
header<span style="color: #009900;">[</span><span style="color: #0000dd;">3</span><span style="color: #009900;">]</span> <span style="color: #339933;">=</span> <span style="color: #ff0000;">'F'</span><span style="color: #339933;">;</span>
mem_put_le16<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">4</span><span style="color: #339933;">,</span> <span style="color: #0000dd;">0</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #808080; font-style: italic;">/* version */</span>
mem_put_le16<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">6</span><span style="color: #339933;">,</span> <span style="color: #0000dd;">32</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #808080; font-style: italic;">/* headersize */</span>
mem_put_le32<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">8</span><span style="color: #339933;">,</span> fourcc<span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #808080; font-style: italic;">/* headersize */</span>
mem_put_le16<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">12</span><span style="color: #339933;">,</span> cfg<span style="color: #339933;">-></span>g_w<span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #808080; font-style: italic;">/* width */</span>
mem_put_le16<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">14</span><span style="color: #339933;">,</span> cfg<span style="color: #339933;">-></span>g_h<span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #808080; font-style: italic;">/* height */</span>
mem_put_le32<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">16</span><span style="color: #339933;">,</span> cfg<span style="color: #339933;">-></span>g_timebase.<span style="color: #202020;">den</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #808080; font-style: italic;">/* rate */</span>
mem_put_le32<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">20</span><span style="color: #339933;">,</span> cfg<span style="color: #339933;">-></span>g_timebase.<span style="color: #202020;">num</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #808080; font-style: italic;">/* scale */</span>
mem_put_le32<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">24</span><span style="color: #339933;">,</span> frame_cnt<span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #808080; font-style: italic;">/* length */</span>
mem_put_le32<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">28</span><span style="color: #339933;">,</span> <span style="color: #0000dd;">0</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span> <span style="color: #808080; font-style: italic;">/* unused */</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>fwrite<span style="color: #009900;">(</span>header<span style="color: #339933;">,</span> <span style="color: #0000dd;">1</span><span style="color: #339933;">,</span> <span style="color: #0000dd;">32</span><span style="color: #339933;">,</span> outfile<span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
<span style="color: #993333;">static</span> <span style="color: #993333;">void</span> write_ivf_frame_header<span style="color: #009900;">(</span>FILE <span style="color: #339933;">*</span>outfile<span style="color: #339933;">,</span>
<span style="color: #993333;">const</span> vpx_codec_cx_pkt_t <span style="color: #339933;">*</span>pkt<span style="color: #009900;">)</span>
<span style="color: #009900;">{</span>
<span style="color: #993333;">char</span> header<span style="color: #009900;">[</span><span style="color: #0000dd;">12</span><span style="color: #009900;">]</span><span style="color: #339933;">;</span>
vpx_codec_pts_t pts<span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>pkt<span style="color: #339933;">-></span>kind <span style="color: #339933;">!=</span> VPX_CODEC_CX_FRAME_PKT<span style="color: #009900;">)</span>
<span style="color: #b1b100;">return</span><span style="color: #339933;">;</span>
pts <span style="color: #339933;">=</span> pkt<span style="color: #339933;">-></span>data.<span style="color: #202020;">frame</span>.<span style="color: #202020;">pts</span><span style="color: #339933;">;</span>
mem_put_le32<span style="color: #009900;">(</span>header<span style="color: #339933;">,</span> pkt<span style="color: #339933;">-></span>data.<span style="color: #202020;">frame</span>.<span style="color: #202020;">sz</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
mem_put_le32<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">4</span><span style="color: #339933;">,</span> pts<span style="color: #339933;">&</span><span style="color: #208080;">0xFFFFFFFF</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
mem_put_le32<span style="color: #009900;">(</span>header<span style="color: #339933;">+</span><span style="color: #0000dd;">8</span><span style="color: #339933;">,</span> pts <span style="color: #339933;">>></span> <span style="color: #0000dd;">32</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>fwrite<span style="color: #009900;">(</span>header<span style="color: #339933;">,</span> <span style="color: #0000dd;">1</span><span style="color: #339933;">,</span> <span style="color: #0000dd;">12</span><span style="color: #339933;">,</span> outfile<span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
<span style="color: #993333;">int</span> main<span style="color: #009900;">(</span><span style="color: #993333;">int</span> argc<span style="color: #339933;">,</span> <span style="color: #993333;">char</span> <span style="color: #339933;">**</span>argv<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
FILE <span style="color: #339933;">*</span>infile<span style="color: #339933;">,</span> <span style="color: #339933;">*</span>outfile<span style="color: #339933;">;</span>
vpx_codec_ctx_t codec<span style="color: #339933;">;</span>
vpx_codec_enc_cfg_t cfg<span style="color: #339933;">;</span>
<span style="color: #993333;">int</span> frame_cnt <span style="color: #339933;">=</span> <span style="color: #0000dd;">0</span><span style="color: #339933;">;</span>
vpx_image_t raw<span style="color: #339933;">;</span>
vpx_codec_err_t res<span style="color: #339933;">;</span>
<span style="color: #993333;">long</span> width<span style="color: #339933;">;</span>
<span style="color: #993333;">long</span> height<span style="color: #339933;">;</span>
<span style="color: #993333;">int</span> frame_avail<span style="color: #339933;">;</span>
<span style="color: #993333;">int</span> got_data<span style="color: #339933;">;</span>
<span style="color: #993333;">int</span> flags <span style="color: #339933;">=</span> <span style="color: #0000dd;">0</span><span style="color: #339933;">;</span>
<span style="color: #808080; font-style: italic;">/* Open files */</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>argc<span style="color: #339933;">!=</span><span style="color: #0000dd;">5</span><span style="color: #009900;">)</span>
die<span style="color: #009900;">(</span><span style="color: #ff0000;">"Usage: %s <width> <height> <infile> <outfile><span style="color: #000099; font-weight: bold;">\n</span>"</span><span style="color: #339933;">,</span> argv<span style="color: #009900;">[</span><span style="color: #0000dd;">0</span><span style="color: #009900;">]</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
width <span style="color: #339933;">=</span> strtol<span style="color: #009900;">(</span>argv<span style="color: #009900;">[</span><span style="color: #0000dd;">1</span><span style="color: #009900;">]</span><span style="color: #339933;">,</span> NULL<span style="color: #339933;">,</span> <span style="color: #0000dd;">0</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
height <span style="color: #339933;">=</span> strtol<span style="color: #009900;">(</span>argv<span style="color: #009900;">[</span><span style="color: #0000dd;">2</span><span style="color: #009900;">]</span><span style="color: #339933;">,</span> NULL<span style="color: #339933;">,</span> <span style="color: #0000dd;">0</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>width <span style="color: #339933;"><</span> <span style="color: #0000dd;">16</span> <span style="color: #339933;">||</span> width<span style="color: #339933;">%</span><span style="color:#800080;">2</span> <span style="color: #339933;">||</span> height <span style="color: #339933;"><</span><span style="color: #0000dd;">16</span> <span style="color: #339933;">||</span> height<span style="color: #339933;">%</span><span style="color:#800080;">2</span><span style="color: #009900;">)</span>
die<span style="color: #009900;">(</span><span style="color: #ff0000;">"Invalid resolution: %ldx%ld"</span><span style="color: #339933;">,</span> width<span style="color: #339933;">,</span> height<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span><span style="color: #339933;">!</span>vpx_img_alloc<span style="color: #009900;">(</span><span style="color: #339933;">&</span>raw<span style="color: #339933;">,</span> VPX_IMG_FMT_I420<span style="color: #339933;">,</span> width<span style="color: #339933;">,</span> height<span style="color: #339933;">,</span> <span style="color: #0000dd;">1</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span>
die<span style="color: #009900;">(</span><span style="color: #ff0000;">"Faile to allocate image"</span><span style="color: #339933;">,</span> width<span style="color: #339933;">,</span> height<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span><span style="color: #339933;">!</span><span style="color: #009900;">(</span>outfile <span style="color: #339933;">=</span> fopen<span style="color: #009900;">(</span>argv<span style="color: #009900;">[</span><span style="color: #0000dd;">4</span><span style="color: #009900;">]</span><span style="color: #339933;">,</span> <span style="color: #ff0000;">"wb"</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span>
die<span style="color: #009900;">(</span><span style="color: #ff0000;">"Failed to open %s for writing"</span><span style="color: #339933;">,</span> argv<span style="color: #009900;">[</span><span style="color: #0000dd;">4</span><span style="color: #009900;">]</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/printf.html"><span style="color: #000066;">printf</span></a><span style="color: #009900;">(</span><span style="color: #ff0000;">"Using %s<span style="color: #000099; font-weight: bold;">\n</span>"</span><span style="color: #339933;">,</span>vpx_codec_iface_name<span style="color: #009900;">(</span>interface<span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #808080; font-style: italic;">/* Populate encoder configuration */</span>
res <span style="color: #339933;">=</span> vpx_codec_enc_config_default<span style="color: #009900;">(</span>interface<span style="color: #339933;">,</span> <span style="color: #339933;">&</span>cfg<span style="color: #339933;">,</span> <span style="color: #0000dd;">0</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>res<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/printf.html"><span style="color: #000066;">printf</span></a><span style="color: #009900;">(</span><span style="color: #ff0000;">"Failed to get config: %s<span style="color: #000099; font-weight: bold;">\n</span>"</span><span style="color: #339933;">,</span> vpx_codec_err_to_string<span style="color: #009900;">(</span>res<span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">return</span> EXIT_FAILURE<span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
<span style="color: #808080; font-style: italic;">/* Update the default configuration with our settings */</span>
cfg.<span style="color: #202020;">rc_target_bitrate</span> <span style="color: #339933;">=</span> width <span style="color: #339933;">*</span> height <span style="color: #339933;">*</span> cfg.<span style="color: #202020;">rc_target_bitrate</span>
<span style="color: #339933;">/</span> cfg.<span style="color: #202020;">g_w</span> <span style="color: #339933;">/</span> cfg.<span style="color: #202020;">g_h</span><span style="color: #339933;">;</span>
cfg.<span style="color: #202020;">g_w</span> <span style="color: #339933;">=</span> width<span style="color: #339933;">;</span>
cfg.<span style="color: #202020;">g_h</span> <span style="color: #339933;">=</span> height<span style="color: #339933;">;</span>
write_ivf_file_header<span style="color: #009900;">(</span>outfile<span style="color: #339933;">,</span> <span style="color: #339933;">&</span>cfg<span style="color: #339933;">,</span> <span style="color: #0000dd;">0</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #808080; font-style: italic;">/* Open input file for this encoding pass */</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span><span style="color: #339933;">!</span><span style="color: #009900;">(</span>infile <span style="color: #339933;">=</span> fopen<span style="color: #009900;">(</span>argv<span style="color: #009900;">[</span><span style="color: #0000dd;">3</span><span style="color: #009900;">]</span><span style="color: #339933;">,</span> <span style="color: #ff0000;">"rb"</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span>
die<span style="color: #009900;">(</span><span style="color: #ff0000;">"Failed to open %s for reading"</span><span style="color: #339933;">,</span> argv<span style="color: #009900;">[</span><span style="color: #0000dd;">3</span><span style="color: #009900;">]</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #808080; font-style: italic;">/* Initialize codec */</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>vpx_codec_enc_init<span style="color: #009900;">(</span><span style="color: #339933;">&</span>codec<span style="color: #339933;">,</span> interface<span style="color: #339933;">,</span> <span style="color: #339933;">&</span>cfg<span style="color: #339933;">,</span> <span style="color: #0000dd;">0</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span>
die_codec<span style="color: #009900;">(</span><span style="color: #339933;">&</span>codec<span style="color: #339933;">,</span> <span style="color: #ff0000;">"Failed to initialize encoder"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
frame_avail <span style="color: #339933;">=</span> <span style="color: #0000dd;">1</span><span style="color: #339933;">;</span>
got_data <span style="color: #339933;">=</span> <span style="color: #0000dd;">0</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">while</span><span style="color: #009900;">(</span>frame_avail <span style="color: #339933;">||</span> got_data<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
vpx_codec_iter_t iter <span style="color: #339933;">=</span> NULL<span style="color: #339933;">;</span>
<span style="color: #993333;">const</span> vpx_codec_cx_pkt_t <span style="color: #339933;">*</span>pkt<span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span><span style="color: #339933;">!</span><span style="color: #009900;">(</span>frame_cnt <span style="color: #339933;">&</span> <span style="color: #0000dd;">7</span><span style="color: #009900;">)</span><span style="color: #009900;">)</span> <span style="color: #666666; font-style: italic;">//</span>
flags <span style="color: #339933;">|=</span> VPX_EFLAG_FORCE_KF<span style="color: #339933;">;</span> <span style="color: #666666; font-style: italic;">//</span>
<span style="color: #b1b100;">else</span> <span style="color: #666666; font-style: italic;">//</span>
flags <span style="color: #339933;">&=</span> ~VPX_EFLAG_FORCE_KF<span style="color: #339933;">;</span> <span style="color: #666666; font-style: italic;">//</span>
frame_avail <span style="color: #339933;">=</span> read_frame<span style="color: #009900;">(</span>infile<span style="color: #339933;">,</span> <span style="color: #339933;">&</span>raw<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>vpx_codec_encode<span style="color: #009900;">(</span><span style="color: #339933;">&</span>codec<span style="color: #339933;">,</span> frame_avail<span style="color: #339933;">?</span> <span style="color: #339933;">&</span>raw <span style="color: #339933;">:</span> NULL<span style="color: #339933;">,</span> frame_cnt<span style="color: #339933;">,</span>
<span style="color: #0000dd;">1</span><span style="color: #339933;">,</span> flags<span style="color: #339933;">,</span> VPX_DL_REALTIME<span style="color: #009900;">)</span><span style="color: #009900;">)</span>
die_codec<span style="color: #009900;">(</span><span style="color: #339933;">&</span>codec<span style="color: #339933;">,</span> <span style="color: #ff0000;">"Failed to encode frame"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
got_data <span style="color: #339933;">=</span> <span style="color: #0000dd;">0</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">while</span><span style="color: #009900;">(</span> <span style="color: #009900;">(</span>pkt <span style="color: #339933;">=</span> vpx_codec_get_cx_data<span style="color: #009900;">(</span><span style="color: #339933;">&</span>codec<span style="color: #339933;">,</span> <span style="color: #339933;">&</span>iter<span style="color: #009900;">)</span><span style="color: #009900;">)</span> <span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
got_data <span style="color: #339933;">=</span> <span style="color: #0000dd;">1</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">switch</span><span style="color: #009900;">(</span>pkt<span style="color: #339933;">-></span>kind<span style="color: #009900;">)</span> <span style="color: #009900;">{</span>
<span style="color: #b1b100;">case</span> VPX_CODEC_CX_FRAME_PKT<span style="color: #339933;">:</span>
write_ivf_frame_header<span style="color: #009900;">(</span>outfile<span style="color: #339933;">,</span> pkt<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>fwrite<span style="color: #009900;">(</span>pkt<span style="color: #339933;">-></span>data.<span style="color: #202020;">frame</span>.<span style="color: #202020;">buf</span><span style="color: #339933;">,</span> <span style="color: #0000dd;">1</span><span style="color: #339933;">,</span> pkt<span style="color: #339933;">-></span>data.<span style="color: #202020;">frame</span>.<span style="color: #202020;">sz</span><span style="color: #339933;">,</span>
outfile<span style="color: #009900;">)</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #000000; font-weight: bold;">break</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">default</span><span style="color: #339933;">:</span>
<span style="color: #000000; font-weight: bold;">break</span><span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/printf.html"><span style="color: #000066;">printf</span></a><span style="color: #009900;">(</span>pkt<span style="color: #339933;">-></span>kind <span style="color: #339933;">==</span> VPX_CODEC_CX_FRAME_PKT
<span style="color: #339933;">&&</span> <span style="color: #009900;">(</span>pkt<span style="color: #339933;">-></span>data.<span style="color: #202020;">frame</span>.<span style="color: #202020;">flags</span> <span style="color: #339933;">&</span> VPX_FRAME_IS_KEY<span style="color: #009900;">)</span><span style="color: #339933;">?</span> <span style="color: #ff0000;">"K"</span><span style="color: #339933;">:</span><span style="color: #ff0000;">"."</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
fflush<span style="color: #009900;">(</span>stdout<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #009900;">}</span>
frame_cnt<span style="color: #339933;">++;</span>
<span style="color: #009900;">}</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/printf.html"><span style="color: #000066;">printf</span></a><span style="color: #009900;">(</span><span style="color: #ff0000;">"<span style="color: #000099; font-weight: bold;">\n</span>"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
fclose<span style="color: #009900;">(</span>infile<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/printf.html"><span style="color: #000066;">printf</span></a><span style="color: #009900;">(</span><span style="color: #ff0000;">"Processed %d frames.<span style="color: #000099; font-weight: bold;">\n</span>"</span><span style="color: #339933;">,</span>frame_cnt<span style="color: #339933;">-</span><span style="color: #0000dd;">1</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span>vpx_codec_destroy<span style="color: #009900;">(</span><span style="color: #339933;">&</span>codec<span style="color: #009900;">)</span><span style="color: #009900;">)</span>
die_codec<span style="color: #009900;">(</span><span style="color: #339933;">&</span>codec<span style="color: #339933;">,</span> <span style="color: #ff0000;">"Failed to destroy codec"</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #808080; font-style: italic;">/* Try to rewrite the file header with the actual frame count */</span>
<span style="color: #b1b100;">if</span><span style="color: #009900;">(</span><span style="color: #339933;">!</span>fseek<span style="color: #009900;">(</span>outfile<span style="color: #339933;">,</span> <span style="color: #0000dd;">0</span><span style="color: #339933;">,</span> SEEK_SET<span style="color: #009900;">)</span><span style="color: #009900;">)</span>
write_ivf_file_header<span style="color: #009900;">(</span>outfile<span style="color: #339933;">,</span> <span style="color: #339933;">&</span>cfg<span style="color: #339933;">,</span> frame_cnt<span style="color: #339933;">-</span><span style="color: #0000dd;">1</span><span style="color: #009900;">)</span><span style="color: #339933;">;</span>
fclose<span style="color: #009900;">(</span>outfile<span style="color: #009900;">)</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">return</span> EXIT_SUCCESS<span style="color: #339933;">;</span>
<span style="color: #009900;">}</span></pre>
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