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 <span id="projectnumber">2.7.1</span>
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<div class="title">resampling_audio.c</div> </div>
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<p>libswresample API use example.</p>
<div class="fragment"><pre class="fragment"><span class="comment">/*</span>
<span class="comment"> * Copyright (c) 2012 Stefano Sabatini</span>
<span class="comment"> *</span>
<span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a copy</span>
<span class="comment"> * of this software and associated documentation files (the "Software"), to deal</span>
<span class="comment"> * in the Software without restriction, including without limitation the rights</span>
<span class="comment"> * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span>
<span class="comment"> * copies of the Software, and to permit persons to whom the Software is</span>
<span class="comment"> * furnished to do so, subject to the following conditions:</span>
<span class="comment"> *</span>
<span class="comment"> * The above copyright notice and this permission notice shall be included in</span>
<span class="comment"> * all copies or substantial portions of the Software.</span>
<span class="comment"> *</span>
<span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span>
<span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span>
<span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL</span>
<span class="comment"> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span>
<span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span>
<span class="comment"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN</span>
<span class="comment"> * THE SOFTWARE.</span>
<span class="comment"> */</span>
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * @example resampling_audio.c</span>
<span class="comment"> * libswresample API use example.</span>
<span class="comment"> */</span>
<span class="preprocessor">#include <<a class="code" href="opt_8h.html" title="AVOptions.">libavutil/opt.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="channel__layout_8h.html" title="audio channel layout utility functions">libavutil/channel_layout.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="samplefmt_8h.html">libavutil/samplefmt.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="swresample_8h.html" title="libswresample public header">libswresample/swresample.h</a>></span>
<span class="keyword">static</span> <span class="keywordtype">int</span> <a name="a0"></a><a class="code" href="demuxing__decoding_8c.html#a5e068fc5e6dc5c59638ec235f7f6db89">get_format_from_sample_fmt</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> **fmt,
<span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5" title="Audio sample formats.">AVSampleFormat</a> sample_fmt)
{
<span class="keywordtype">int</span> i;
<span class="keyword">struct </span>sample_fmt_entry {
<span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5" title="Audio sample formats.">AVSampleFormat</a> sample_fmt; <span class="keyword">const</span> <span class="keywordtype">char</span> *fmt_be, *fmt_le;
} sample_fmt_entries[] = {
{ <a name="a1"></a><a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5adf0f66f21492f8fd5db6debb8b3f932a" title="unsigned 8 bits">AV_SAMPLE_FMT_U8</a>, <span class="stringliteral">"u8"</span>, <span class="stringliteral">"u8"</span> },
{ <a name="a2"></a><a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5aea6132df57aebc3f76e10665395c46af" title="signed 16 bits">AV_SAMPLE_FMT_S16</a>, <span class="stringliteral">"s16be"</span>, <span class="stringliteral">"s16le"</span> },
{ <a name="a3"></a><a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ab7ae6bb6718c07cd316778783a57a63b" title="signed 32 bits">AV_SAMPLE_FMT_S32</a>, <span class="stringliteral">"s32be"</span>, <span class="stringliteral">"s32le"</span> },
{ <a name="a4"></a><a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5a5251d62cc3c7f18e56bc8e0c48a27903" title="float">AV_SAMPLE_FMT_FLT</a>, <span class="stringliteral">"f32be"</span>, <span class="stringliteral">"f32le"</span> },
{ <a name="a5"></a><a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ae35a2a6a7593723d9fe4bcefb2876606" title="double">AV_SAMPLE_FMT_DBL</a>, <span class="stringliteral">"f64be"</span>, <span class="stringliteral">"f64le"</span> },
};
*fmt = NULL;
<span class="keywordflow">for</span> (i = 0; i < <a name="a6"></a><a class="code" href="common_8h.html#a3508a98d3ee7e2c9a4841fe264cf70f7">FF_ARRAY_ELEMS</a>(sample_fmt_entries); i++) {
<span class="keyword">struct </span>sample_fmt_entry *entry = &sample_fmt_entries[i];
<span class="keywordflow">if</span> (sample_fmt == entry->sample_fmt) {
*fmt = <a name="a7"></a><a class="code" href="common_8h.html#a309bdca20f6a78431379fc69442d98ea">AV_NE</a>(entry->fmt_be, entry->fmt_le);
<span class="keywordflow">return</span> 0;
}
}
fprintf(stderr,
<span class="stringliteral">"Sample format %s not supported as output format\n"</span>,
<a name="a8"></a><a class="code" href="group__lavu__sampfmts.html#ga31b9d149b2de9821a65f4f5612970838" title="Return the name of sample_fmt, or NULL if sample_fmt is not recognized.">av_get_sample_fmt_name</a>(sample_fmt));
<span class="keywordflow">return</span> <a name="a9"></a><a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(EINVAL);
}
<span class="comment"></span>
<span class="comment">/**</span>
<span class="comment"> * Fill dst buffer with nb_samples, generated starting from t.</span>
<span class="comment"> */</span>
<span class="keyword">static</span> <span class="keywordtype">void</span> <a name="a10"></a><a class="code" href="resampling__audio_8c.html#af40a34d598e4ae80bc0539e9f5761c5f" title="Fill dst buffer with nb_samples, generated starting from t.">fill_samples</a>(<span class="keywordtype">double</span> *dst, <span class="keywordtype">int</span> nb_samples, <span class="keywordtype">int</span> nb_channels, <span class="keywordtype">int</span> sample_rate, <span class="keywordtype">double</span> *t)
{
<span class="keywordtype">int</span> i, j;
<span class="keywordtype">double</span> tincr = 1.0 / sample_rate, *dstp = dst;
<span class="keyword">const</span> <span class="keywordtype">double</span> c = 2 * M_PI * 440.0;
<span class="comment">/* generate sin tone with 440Hz frequency and duplicated channels */</span>
<span class="keywordflow">for</span> (i = 0; i < nb_samples; i++) {
*dstp = sin(c * *t);
<span class="keywordflow">for</span> (j = 1; j < nb_channels; j++)
dstp[j] = dstp[0];
dstp += nb_channels;
*t += tincr;
}
}
<span class="keywordtype">int</span> <a name="a11"></a><a class="code" href="avio__list__dir_8c.html#a0ddf1224851353fc92bfbff6f499fa97">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)
{
int64_t src_ch_layout = <a name="a12"></a><a class="code" href="group__channel__mask__c.html#gabc6d6651bba254cd0fa2c42a57228e65">AV_CH_LAYOUT_STEREO</a>, dst_ch_layout = <a name="a13"></a><a class="code" href="group__channel__mask__c.html#ga625aec7f2285dc35e3ed801e91889564">AV_CH_LAYOUT_SURROUND</a>;
<span class="keywordtype">int</span> src_rate = 48000, dst_rate = 44100;
uint8_t **src_data = NULL, **dst_data = NULL;
<span class="keywordtype">int</span> src_nb_channels = 0, dst_nb_channels = 0;
<span class="keywordtype">int</span> src_linesize, dst_linesize;
<span class="keywordtype">int</span> src_nb_samples = 1024, dst_nb_samples, max_dst_nb_samples;
<span class="keyword">enum</span> <a class="code" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5" title="Audio sample formats.">AVSampleFormat</a> src_sample_fmt = <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5ae35a2a6a7593723d9fe4bcefb2876606" title="double">AV_SAMPLE_FMT_DBL</a>, dst_sample_fmt = <a class="code" href="group__lavu__sampfmts.html#ggaf9a51ca15301871723577c730b5865c5aea6132df57aebc3f76e10665395c46af" title="signed 16 bits">AV_SAMPLE_FMT_S16</a>;
<span class="keyword">const</span> <span class="keywordtype">char</span> *dst_filename = NULL;
FILE *dst_file;
<span class="keywordtype">int</span> dst_bufsize;
<span class="keyword">const</span> <span class="keywordtype">char</span> *fmt;
<span class="keyword">struct </span><a class="code" href="group__lswr.html#ga4aa775b7fba31d2c8dc14c7b7e282863" title="The libswresample context.">SwrContext</a> *swr_ctx;
<span class="keywordtype">double</span> t;
<span class="keywordtype">int</span> ret;
<span class="keywordflow">if</span> (argc != 2) {
fprintf(stderr, <span class="stringliteral">"Usage: %s output_file\n"</span>
<span class="stringliteral">"API example program to show how to resample an audio stream with libswresample.\n"</span>
<span class="stringliteral">"This program generates a series of audio frames, resamples them to a specified "</span>
<span class="stringliteral">"output format and rate and saves them to an output file named output_file.\n"</span>,
argv[0]);
exit(1);
}
dst_filename = argv[1];
dst_file = fopen(dst_filename, <span class="stringliteral">"wb"</span>);
<span class="keywordflow">if</span> (!dst_file) {
fprintf(stderr, <span class="stringliteral">"Could not open destination file %s\n"</span>, dst_filename);
exit(1);
}
<span class="comment">/* create resampler context */</span>
swr_ctx = <a name="a14"></a><a class="code" href="group__lswr.html#gaf58c4ff10f73d74bdab8e5aa7193147c" title="Allocate SwrContext.">swr_alloc</a>();
<span class="keywordflow">if</span> (!swr_ctx) {
fprintf(stderr, <span class="stringliteral">"Could not allocate resampler context\n"</span>);
ret = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(ENOMEM);
<span class="keywordflow">goto</span> end;
}
<span class="comment">/* set options */</span>
<a name="a15"></a><a class="code" href="group__opt__set__funcs.html#ga3adf7185c21cc080890a5ec02c2e56b2">av_opt_set_int</a>(swr_ctx, <span class="stringliteral">"in_channel_layout"</span>, src_ch_layout, 0);
<a class="code" href="group__opt__set__funcs.html#ga3adf7185c21cc080890a5ec02c2e56b2">av_opt_set_int</a>(swr_ctx, <span class="stringliteral">"in_sample_rate"</span>, src_rate, 0);
<a name="a16"></a><a class="code" href="group__opt__set__funcs.html#gad446f7a7b92442e464d43e400e661040">av_opt_set_sample_fmt</a>(swr_ctx, <span class="stringliteral">"in_sample_fmt"</span>, src_sample_fmt, 0);
<a class="code" href="group__opt__set__funcs.html#ga3adf7185c21cc080890a5ec02c2e56b2">av_opt_set_int</a>(swr_ctx, <span class="stringliteral">"out_channel_layout"</span>, dst_ch_layout, 0);
<a class="code" href="group__opt__set__funcs.html#ga3adf7185c21cc080890a5ec02c2e56b2">av_opt_set_int</a>(swr_ctx, <span class="stringliteral">"out_sample_rate"</span>, dst_rate, 0);
<a class="code" href="group__opt__set__funcs.html#gad446f7a7b92442e464d43e400e661040">av_opt_set_sample_fmt</a>(swr_ctx, <span class="stringliteral">"out_sample_fmt"</span>, dst_sample_fmt, 0);
<span class="comment">/* initialize the resampling context */</span>
<span class="keywordflow">if</span> ((ret = <a name="a17"></a><a class="code" href="group__lswr.html#gae173e8ed91717700471a1dcd06f00f67" title="Initialize context after user parameters have been set.">swr_init</a>(swr_ctx)) < 0) {
fprintf(stderr, <span class="stringliteral">"Failed to initialize the resampling context\n"</span>);
<span class="keywordflow">goto</span> end;
}
<span class="comment">/* allocate source and destination samples buffers */</span>
src_nb_channels = <a name="a18"></a><a class="code" href="group__channel__mask__c.html#gac95619abeb32e4a3daa18e3ff3419380" title="Return the number of channels in the channel layout.">av_get_channel_layout_nb_channels</a>(src_ch_layout);
ret = <a name="a19"></a><a class="code" href="group__lavu__sampmanip.html#gae8b9f22f2f659d023f111390d9545273" title="Allocate a data pointers array, samples buffer for nb_samples samples, and fill data pointers and lin...">av_samples_alloc_array_and_samples</a>(&src_data, &src_linesize, src_nb_channels,
src_nb_samples, src_sample_fmt, 0);
<span class="keywordflow">if</span> (ret < 0) {
fprintf(stderr, <span class="stringliteral">"Could not allocate source samples\n"</span>);
<span class="keywordflow">goto</span> end;
}
<span class="comment">/* compute the number of converted samples: buffering is avoided</span>
<span class="comment"> * ensuring that the output buffer will contain at least all the</span>
<span class="comment"> * converted input samples */</span>
max_dst_nb_samples = dst_nb_samples =
<a name="a20"></a><a class="code" href="group__lavu__math.html#gad686ab94939ed4c65218309e94bdca72" title="Rescale a 64-bit integer with specified rounding.">av_rescale_rnd</a>(src_nb_samples, dst_rate, src_rate, <a name="a21"></a><a class="code" href="group__lavu__math.html#gga921d656eaf2c4d6800a734a13af021d0aa1d28e08e2f8b49b256e056f93038c1a" title="Round toward +infinity.">AV_ROUND_UP</a>);
<span class="comment">/* buffer is going to be directly written to a rawaudio file, no alignment */</span>
dst_nb_channels = <a class="code" href="group__channel__mask__c.html#gac95619abeb32e4a3daa18e3ff3419380" title="Return the number of channels in the channel layout.">av_get_channel_layout_nb_channels</a>(dst_ch_layout);
ret = <a class="code" href="group__lavu__sampmanip.html#gae8b9f22f2f659d023f111390d9545273" title="Allocate a data pointers array, samples buffer for nb_samples samples, and fill data pointers and lin...">av_samples_alloc_array_and_samples</a>(&dst_data, &dst_linesize, dst_nb_channels,
dst_nb_samples, dst_sample_fmt, 0);
<span class="keywordflow">if</span> (ret < 0) {
fprintf(stderr, <span class="stringliteral">"Could not allocate destination samples\n"</span>);
<span class="keywordflow">goto</span> end;
}
t = 0;
<span class="keywordflow">do</span> {
<span class="comment">/* generate synthetic audio */</span>
<a class="code" href="resampling__audio_8c.html#af40a34d598e4ae80bc0539e9f5761c5f" title="Fill dst buffer with nb_samples, generated starting from t.">fill_samples</a>((<span class="keywordtype">double</span> *)src_data[0], src_nb_samples, src_nb_channels, src_rate, &t);
<span class="comment">/* compute destination number of samples */</span>
dst_nb_samples = <a class="code" href="group__lavu__math.html#gad686ab94939ed4c65218309e94bdca72" title="Rescale a 64-bit integer with specified rounding.">av_rescale_rnd</a>(<a name="a22"></a><a class="code" href="group__lswr.html#ga5121a5a7890a2d23b72dc871dd0ebb06" title="Gets the delay the next input sample will experience relative to the next output sample.">swr_get_delay</a>(swr_ctx, src_rate) +
src_nb_samples, dst_rate, src_rate, <a class="code" href="group__lavu__math.html#gga921d656eaf2c4d6800a734a13af021d0aa1d28e08e2f8b49b256e056f93038c1a" title="Round toward +infinity.">AV_ROUND_UP</a>);
<span class="keywordflow">if</span> (dst_nb_samples > max_dst_nb_samples) {
<a name="a23"></a><a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba" title="Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...">av_freep</a>(&dst_data[0]);
ret = <a name="a24"></a><a class="code" href="group__lavu__sampmanip.html#ga4db4c77f928d32c7d8854732f50b8c04" title="Allocate a samples buffer for nb_samples samples, and fill data pointers and linesize accordingly...">av_samples_alloc</a>(dst_data, &dst_linesize, dst_nb_channels,
dst_nb_samples, dst_sample_fmt, 1);
<span class="keywordflow">if</span> (ret < 0)
<span class="keywordflow">break</span>;
max_dst_nb_samples = dst_nb_samples;
}
<span class="comment">/* convert to destination format */</span>
ret = <a name="a25"></a><a class="code" href="group__lswr.html#gaa5bb6cab830146efa8c760fa66ee582a" title="Convert audio.">swr_convert</a>(swr_ctx, dst_data, dst_nb_samples, (<span class="keyword">const</span> uint8_t **)src_data, src_nb_samples);
<span class="keywordflow">if</span> (ret < 0) {
fprintf(stderr, <span class="stringliteral">"Error while converting\n"</span>);
<span class="keywordflow">goto</span> end;
}
dst_bufsize = <a name="a26"></a><a class="code" href="group__lavu__sampfmts.html#gaa7368bc4e3a366b688e81938ed55eb06" title="Get the required buffer size for the given audio parameters.">av_samples_get_buffer_size</a>(&dst_linesize, dst_nb_channels,
ret, dst_sample_fmt, 1);
<span class="keywordflow">if</span> (dst_bufsize < 0) {
fprintf(stderr, <span class="stringliteral">"Could not get sample buffer size\n"</span>);
<span class="keywordflow">goto</span> end;
}
printf(<span class="stringliteral">"t:%f in:%d out:%d\n"</span>, t, src_nb_samples, ret);
fwrite(dst_data[0], 1, dst_bufsize, dst_file);
} <span class="keywordflow">while</span> (t < 10);
<span class="keywordflow">if</span> ((ret = <a class="code" href="demuxing__decoding_8c.html#a5e068fc5e6dc5c59638ec235f7f6db89">get_format_from_sample_fmt</a>(&fmt, dst_sample_fmt)) < 0)
<span class="keywordflow">goto</span> end;
fprintf(stderr, <span class="stringliteral">"Resampling succeeded. Play the output file with the command:\n"</span>
<span class="stringliteral">"ffplay -f %s -channel_layout %"</span>PRId64<span class="stringliteral">" -channels %d -ar %d %s\n"</span>,
fmt, dst_ch_layout, dst_nb_channels, dst_rate, dst_filename);
end:
fclose(dst_file);
<span class="keywordflow">if</span> (src_data)
<a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba" title="Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...">av_freep</a>(&src_data[0]);
<a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba" title="Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...">av_freep</a>(&src_data);
<span class="keywordflow">if</span> (dst_data)
<a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba" title="Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...">av_freep</a>(&dst_data[0]);
<a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba" title="Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...">av_freep</a>(&dst_data);
<a name="a27"></a><a class="code" href="group__lswr.html#ga818f7d78b1ad7d8d5b70de374b668c34" title="Free the given SwrContext and set the pointer to NULL.">swr_free</a>(&swr_ctx);
<span class="keywordflow">return</span> ret < 0;
}
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