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a521252845
Use a structure to hold info about the mapping. The application then keeps track of this state and we can use it to unmap the memory again later.
134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/times.h>
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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struct TestParams
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{
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gint tot_size;
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gint read_size;
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gint write_size;
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};
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/* This test pushes 'n' buffers of 'write size' into an adapter, then reads
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* them out in 'read size' sized pieces, using take and then take_buffer,
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* and prints the timings */
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static struct TestParams param_sets[] = {
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/* These values put ~256MB in 1MB chunks in an adapter, then reads them out
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* in 250kb blocks */
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{256000000, 250000, 1000000},
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/* These values put ~256MB in 1000 byte chunks in an adapter, then reads them
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* out in 200 byte blocks */
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{25600000, 200, 1000},
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/* These values put ~256MB in 200 chunks in an adapter, then reads them out
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* in 1000 byte blocks */
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{25600000, 1000, 200}
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};
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static const gint n_tests = sizeof (param_sets) / sizeof (struct TestParams);
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static gint ticks_per_sec;
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static void
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run_test_take (struct TestParams *params)
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{
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/* Create an adapter and feed it data of fixed size, then retrieve it in
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* a different size */
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GstAdapter *adapter = gst_adapter_new ();
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guint8 *data;
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GstBuffer *buf;
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int i;
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gint ntimes = params->tot_size / params->write_size;
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for (i = 0; i < ntimes; i++) {
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buf = gst_buffer_new_and_alloc (params->write_size);
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gst_buffer_memset (buf, 0, 0, params->write_size);
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gst_adapter_push (adapter, buf);
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}
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do {
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data = gst_adapter_take (adapter, params->read_size);
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if (data == NULL)
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break;
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g_free (data);
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} while (TRUE);
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g_object_unref (adapter);
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}
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static void
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run_test_take_buffer (struct TestParams *params)
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{
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/* Create an adapter and feed it data of fixed size, then retrieve it in
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* a different size
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*/
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GstAdapter *adapter = gst_adapter_new ();
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GstBuffer *buf;
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int i;
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gint ntimes = params->tot_size / params->write_size;
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for (i = 0; i < ntimes; i++) {
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buf = gst_buffer_new_and_alloc (params->write_size);
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gst_buffer_memset (buf, 0, 0, params->write_size);
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gst_adapter_push (adapter, buf);
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}
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do {
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buf = gst_adapter_take_buffer (adapter, params->read_size);
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if (buf == NULL)
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break;
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gst_buffer_unref (buf);
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} while (TRUE);
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g_object_unref (adapter);
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}
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static void
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run_tests (struct TestParams *params)
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{
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struct tms time_data;
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gdouble start;
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gdouble dur;
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g_print ("Running on %d bytes, writing %d bytes/buf, reading %d bytes/buf\n",
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params->tot_size, params->write_size, params->read_size);
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start = 0.0;
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run_test_take (params);
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times (&time_data);
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dur = (gdouble) (time_data.tms_utime + time_data.tms_stime) / ticks_per_sec;
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g_print ("Time for take test: %g secs\n", dur - start);
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start = dur;
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run_test_take_buffer (params);
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times (&time_data);
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dur = (gdouble) (time_data.tms_utime + time_data.tms_stime) / ticks_per_sec;
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g_print ("Time for TakeBuffer test: %g secs\n", dur - start);
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g_print ("\n");
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}
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int
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main (int argc, char **argv)
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{
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gint i;
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ticks_per_sec = sysconf (_SC_CLK_TCK);
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gst_init (&argc, &argv);
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for (i = 0; i < n_tests; i++)
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run_tests (param_sets + i);
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return 0;
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}
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