/* GStreamer * * unit test for speexresample, based on the audioresample unit test * * Copyright (C) <2005> Thomas Vander Stichele * Copyright (C) <2006> Tim-Philipp Müller * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include #include #include /* For ease of programming we use globals to keep refs for our floating * src and sink pads we create; otherwise we always have to do get_pad, * get_peer, and then remove references in every test function */ static GstPad *mysrcpad, *mysinkpad; #define RESAMPLE_CAPS_FLOAT \ "audio/x-raw-float, " \ "channels = (int) [ 1, MAX ], " \ "rate = (int) [ 1, MAX ], " \ "endianness = (int) BYTE_ORDER, " \ "width = (int) { 32, 64 }" #define RESAMPLE_CAPS_INT \ "audio/x-raw-int, " \ "channels = (int) [ 1, MAX ], " \ "rate = (int) [ 1, MAX ], " \ "endianness = (int) BYTE_ORDER, " \ "width = (int) 16, " \ "depth = (int) 16, " \ "signed = (bool) TRUE" #define RESAMPLE_CAPS_TEMPLATE_STRING \ RESAMPLE_CAPS_FLOAT " ; " \ RESAMPLE_CAPS_INT static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS (RESAMPLE_CAPS_TEMPLATE_STRING) ); static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (RESAMPLE_CAPS_TEMPLATE_STRING) ); static GstElement * setup_speexresample (int channels, int inrate, int outrate, int width, gboolean fp) { GstElement *speexresample; GstCaps *caps; GstStructure *structure; GST_DEBUG ("setup_speexresample"); speexresample = gst_check_setup_element ("audioresample"); if (fp) caps = gst_caps_from_string (RESAMPLE_CAPS_FLOAT); else caps = gst_caps_from_string (RESAMPLE_CAPS_INT); structure = gst_caps_get_structure (caps, 0); gst_structure_set (structure, "channels", G_TYPE_INT, channels, "rate", G_TYPE_INT, inrate, "width", G_TYPE_INT, width, NULL); if (!fp) gst_structure_set (structure, "depth", G_TYPE_INT, width, NULL); fail_unless (gst_caps_is_fixed (caps)); fail_unless (gst_element_set_state (speexresample, GST_STATE_PAUSED) == GST_STATE_CHANGE_SUCCESS, "could not set to paused"); mysrcpad = gst_check_setup_src_pad (speexresample, &srctemplate, caps); gst_pad_set_caps (mysrcpad, caps); gst_caps_unref (caps); if (fp) caps = gst_caps_from_string (RESAMPLE_CAPS_FLOAT); else caps = gst_caps_from_string (RESAMPLE_CAPS_INT); structure = gst_caps_get_structure (caps, 0); gst_structure_set (structure, "channels", G_TYPE_INT, channels, "rate", G_TYPE_INT, outrate, "width", G_TYPE_INT, width, NULL); if (!fp) gst_structure_set (structure, "depth", G_TYPE_INT, width, NULL); fail_unless (gst_caps_is_fixed (caps)); mysinkpad = gst_check_setup_sink_pad (speexresample, &sinktemplate, caps); /* this installs a getcaps func that will always return the caps we set * later */ gst_pad_set_caps (mysinkpad, caps); gst_pad_use_fixed_caps (mysinkpad); gst_pad_set_active (mysinkpad, TRUE); gst_pad_set_active (mysrcpad, TRUE); gst_caps_unref (caps); return speexresample; } static void cleanup_speexresample (GstElement * speexresample) { GST_DEBUG ("cleanup_speexresample"); fail_unless (gst_element_set_state (speexresample, GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS, "could not set to NULL"); gst_pad_set_active (mysrcpad, FALSE); gst_pad_set_active (mysinkpad, FALSE); gst_check_teardown_src_pad (speexresample); gst_check_teardown_sink_pad (speexresample); gst_check_teardown_element (speexresample); } static void fail_unless_perfect_stream (void) { guint64 timestamp = 0L, duration = 0L; guint64 offset = 0L, offset_end = 0L; GList *l; GstBuffer *buffer; for (l = buffers; l; l = l->next) { buffer = GST_BUFFER (l->data); ASSERT_BUFFER_REFCOUNT (buffer, "buffer", 1); GST_DEBUG ("buffer timestamp %" G_GUINT64_FORMAT ", duration %" G_GUINT64_FORMAT " offset %" G_GUINT64_FORMAT " offset_end %" G_GUINT64_FORMAT, GST_BUFFER_TIMESTAMP (buffer), GST_BUFFER_DURATION (buffer), GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET_END (buffer)); fail_unless_equals_uint64 (timestamp, GST_BUFFER_TIMESTAMP (buffer)); fail_unless_equals_uint64 (offset, GST_BUFFER_OFFSET (buffer)); duration = GST_BUFFER_DURATION (buffer); offset_end = GST_BUFFER_OFFSET_END (buffer); timestamp += duration; offset = offset_end; gst_buffer_unref (buffer); } g_list_free (buffers); buffers = NULL; } /* this tests that the output is a perfect stream if the input is */ static void test_perfect_stream_instance (int inrate, int outrate, int samples, int numbuffers) { GstElement *speexresample; GstBuffer *inbuffer, *outbuffer; GstCaps *caps; guint64 offset = 0; int i, j; gint16 *p; speexresample = setup_speexresample (2, inrate, outrate, 16, FALSE); caps = gst_pad_get_negotiated_caps (mysrcpad); fail_unless (gst_caps_is_fixed (caps)); fail_unless (gst_element_set_state (speexresample, GST_STATE_PLAYING) == GST_STATE_CHANGE_SUCCESS, "could not set to playing"); for (j = 1; j <= numbuffers; ++j) { inbuffer = gst_buffer_new_and_alloc (samples * 4); GST_BUFFER_DURATION (inbuffer) = GST_FRAMES_TO_CLOCK_TIME (samples, inrate); GST_BUFFER_TIMESTAMP (inbuffer) = GST_BUFFER_DURATION (inbuffer) * (j - 1); GST_BUFFER_OFFSET (inbuffer) = offset; offset += samples; GST_BUFFER_OFFSET_END (inbuffer) = offset; gst_buffer_set_caps (inbuffer, caps); p = (gint16 *) GST_BUFFER_DATA (inbuffer); /* create a 16 bit signed ramp */ for (i = 0; i < samples; ++i) { *p = -32767 + i * (65535 / samples); ++p; *p = -32767 + i * (65535 / samples); ++p; } /* pushing gives away my reference ... */ fail_unless (gst_pad_push (mysrcpad, inbuffer) == GST_FLOW_OK); /* ... but it ends up being collected on the global buffer list */ fail_unless_equals_int (g_list_length (buffers), j); } /* FIXME: we should make speexresample handle eos by flushing out the last * samples, which will give us one more, small, buffer */ fail_if ((outbuffer = (GstBuffer *) buffers->data) == NULL); ASSERT_BUFFER_REFCOUNT (outbuffer, "outbuffer", 1); fail_unless_perfect_stream (); /* cleanup */ gst_caps_unref (caps); cleanup_speexresample (speexresample); } /* make sure that outgoing buffers are contiguous in timestamp/duration and * offset/offsetend */ GST_START_TEST (test_perfect_stream) { /* integral scalings */ test_perfect_stream_instance (48000, 24000, 500, 20); test_perfect_stream_instance (48000, 12000, 500, 20); test_perfect_stream_instance (12000, 24000, 500, 20); test_perfect_stream_instance (12000, 48000, 500, 20); /* non-integral scalings */ test_perfect_stream_instance (44100, 8000, 500, 20); test_perfect_stream_instance (8000, 44100, 500, 20); /* wacky scalings */ test_perfect_stream_instance (12345, 54321, 500, 20); test_perfect_stream_instance (101, 99, 500, 20); } GST_END_TEST; /* this tests that the output is a correct discontinuous stream * if the input is; ie input drops in time come out the same way */ static void test_discont_stream_instance (int inrate, int outrate, int samples, int numbuffers) { GstElement *speexresample; GstBuffer *inbuffer, *outbuffer; GstCaps *caps; GstClockTime ints; int i, j; gint16 *p; GST_DEBUG ("inrate:%d outrate:%d samples:%d numbuffers:%d", inrate, outrate, samples, numbuffers); speexresample = setup_speexresample (2, inrate, outrate, 16, FALSE); caps = gst_pad_get_negotiated_caps (mysrcpad); fail_unless (gst_caps_is_fixed (caps)); fail_unless (gst_element_set_state (speexresample, GST_STATE_PLAYING) == GST_STATE_CHANGE_SUCCESS, "could not set to playing"); for (j = 1; j <= numbuffers; ++j) { inbuffer = gst_buffer_new_and_alloc (samples * 4); GST_BUFFER_DURATION (inbuffer) = samples * GST_SECOND / inrate; /* "drop" half the buffers */ ints = GST_BUFFER_DURATION (inbuffer) * 2 * (j - 1); GST_BUFFER_TIMESTAMP (inbuffer) = ints; GST_BUFFER_OFFSET (inbuffer) = (j - 1) * 2 * samples; GST_BUFFER_OFFSET_END (inbuffer) = j * 2 * samples + samples; gst_buffer_set_caps (inbuffer, caps); p = (gint16 *) GST_BUFFER_DATA (inbuffer); /* create a 16 bit signed ramp */ for (i = 0; i < samples; ++i) { *p = -32767 + i * (65535 / samples); ++p; *p = -32767 + i * (65535 / samples); ++p; } GST_DEBUG ("Sending Buffer time:%" G_GUINT64_FORMAT " duration:%" G_GINT64_FORMAT " discont:%d offset:%" G_GUINT64_FORMAT " offset_end:%" G_GUINT64_FORMAT, GST_BUFFER_TIMESTAMP (inbuffer), GST_BUFFER_DURATION (inbuffer), GST_BUFFER_IS_DISCONT (inbuffer), GST_BUFFER_OFFSET (inbuffer), GST_BUFFER_OFFSET_END (inbuffer)); /* pushing gives away my reference ... */ fail_unless (gst_pad_push (mysrcpad, inbuffer) == GST_FLOW_OK); /* check if the timestamp of the pushed buffer matches the incoming one */ outbuffer = g_list_nth_data (buffers, g_list_length (buffers) - 1); fail_if (outbuffer == NULL); fail_unless_equals_uint64 (ints, GST_BUFFER_TIMESTAMP (outbuffer)); GST_DEBUG ("Got Buffer time:%" G_GUINT64_FORMAT " duration:%" G_GINT64_FORMAT " discont:%d offset:%" G_GUINT64_FORMAT " offset_end:%" G_GUINT64_FORMAT, GST_BUFFER_TIMESTAMP (outbuffer), GST_BUFFER_DURATION (outbuffer), GST_BUFFER_IS_DISCONT (outbuffer), GST_BUFFER_OFFSET (outbuffer), GST_BUFFER_OFFSET_END (outbuffer)); if (j > 1) { fail_unless (GST_BUFFER_IS_DISCONT (outbuffer), "expected discont for buffer #%d", j); } } /* cleanup */ gst_caps_unref (caps); cleanup_speexresample (speexresample); } GST_START_TEST (test_discont_stream) { /* integral scalings */ test_discont_stream_instance (48000, 24000, 500, 20); test_discont_stream_instance (48000, 12000, 500, 20); test_discont_stream_instance (12000, 24000, 500, 20); test_discont_stream_instance (12000, 48000, 500, 20); /* non-integral scalings */ test_discont_stream_instance (44100, 8000, 500, 20); test_discont_stream_instance (8000, 44100, 500, 20); /* wacky scalings */ test_discont_stream_instance (12345, 54321, 500, 20); test_discont_stream_instance (101, 99, 500, 20); } GST_END_TEST; GST_START_TEST (test_reuse) { GstElement *speexresample; GstEvent *newseg; GstBuffer *inbuffer; GstCaps *caps; speexresample = setup_speexresample (1, 9343, 48000, 16, FALSE); caps = gst_pad_get_negotiated_caps (mysrcpad); fail_unless (gst_caps_is_fixed (caps)); fail_unless (gst_element_set_state (speexresample, GST_STATE_PLAYING) == GST_STATE_CHANGE_SUCCESS, "could not set to playing"); newseg = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0); fail_unless (gst_pad_push_event (mysrcpad, newseg) != FALSE); inbuffer = gst_buffer_new_and_alloc (9343 * 4); memset (GST_BUFFER_DATA (inbuffer), 0, GST_BUFFER_SIZE (inbuffer)); GST_BUFFER_DURATION (inbuffer) = GST_SECOND; GST_BUFFER_TIMESTAMP (inbuffer) = 0; GST_BUFFER_OFFSET (inbuffer) = 0; gst_buffer_set_caps (inbuffer, caps); /* pushing gives away my reference ... */ fail_unless (gst_pad_push (mysrcpad, inbuffer) == GST_FLOW_OK); /* ... but it ends up being collected on the global buffer list */ fail_unless_equals_int (g_list_length (buffers), 1); /* now reset and try again ... */ fail_unless (gst_element_set_state (speexresample, GST_STATE_NULL) == GST_STATE_CHANGE_SUCCESS, "could not set to NULL"); fail_unless (gst_element_set_state (speexresample, GST_STATE_PLAYING) == GST_STATE_CHANGE_SUCCESS, "could not set to playing"); newseg = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0); fail_unless (gst_pad_push_event (mysrcpad, newseg) != FALSE); inbuffer = gst_buffer_new_and_alloc (9343 * 4); memset (GST_BUFFER_DATA (inbuffer), 0, GST_BUFFER_SIZE (inbuffer)); GST_BUFFER_DURATION (inbuffer) = GST_SECOND; GST_BUFFER_TIMESTAMP (inbuffer) = 0; GST_BUFFER_OFFSET (inbuffer) = 0; gst_buffer_set_caps (inbuffer, caps); fail_unless (gst_pad_push (mysrcpad, inbuffer) == GST_FLOW_OK); /* ... it also ends up being collected on the global buffer list. If we * now have more than 2 buffers, then speexresample probably didn't clean * up its internal buffer properly and tried to push the remaining samples * when it got the second NEWSEGMENT event */ fail_unless_equals_int (g_list_length (buffers), 2); cleanup_speexresample (speexresample); gst_caps_unref (caps); } GST_END_TEST; GST_START_TEST (test_shutdown) { GstElement *pipeline, *src, *cf1, *ar, *cf2, *sink; GstCaps *caps; guint i; /* create pipeline, force speexresample to actually resample */ pipeline = gst_pipeline_new (NULL); src = gst_check_setup_element ("audiotestsrc"); cf1 = gst_check_setup_element ("capsfilter"); ar = gst_check_setup_element ("audioresample"); cf2 = gst_check_setup_element ("capsfilter"); g_object_set (cf2, "name", "capsfilter2", NULL); sink = gst_check_setup_element ("fakesink"); caps = gst_caps_new_simple ("audio/x-raw-int", "rate", G_TYPE_INT, 11025, NULL); g_object_set (cf1, "caps", caps, NULL); gst_caps_unref (caps); caps = gst_caps_new_simple ("audio/x-raw-int", "rate", G_TYPE_INT, 48000, NULL); g_object_set (cf2, "caps", caps, NULL); gst_caps_unref (caps); /* don't want to sync against the clock, the more throughput the better */ g_object_set (src, "is-live", FALSE, NULL); g_object_set (sink, "sync", FALSE, NULL); gst_bin_add_many (GST_BIN (pipeline), src, cf1, ar, cf2, sink, NULL); fail_if (!gst_element_link_many (src, cf1, ar, cf2, sink, NULL)); /* now, wait until pipeline is running and then shut it down again; repeat */ for (i = 0; i < 20; ++i) { gst_element_set_state (pipeline, GST_STATE_PAUSED); gst_element_get_state (pipeline, NULL, NULL, -1); gst_element_set_state (pipeline, GST_STATE_PLAYING); g_usleep (100); gst_element_set_state (pipeline, GST_STATE_NULL); } gst_object_unref (pipeline); } GST_END_TEST; static GstFlowReturn live_switch_alloc_only_48000 (GstPad * pad, guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf) { GstStructure *structure; gint rate; gint channels; GstCaps *desired; structure = gst_caps_get_structure (caps, 0); fail_unless (gst_structure_get_int (structure, "rate", &rate)); fail_unless (gst_structure_get_int (structure, "channels", &channels)); if (rate < 48000) return GST_FLOW_NOT_NEGOTIATED; desired = gst_caps_copy (caps); gst_caps_set_simple (desired, "rate", G_TYPE_INT, 48000, NULL); *buf = gst_buffer_new_and_alloc (channels * 48000); gst_buffer_set_caps (*buf, desired); gst_caps_unref (desired); return GST_FLOW_OK; } static GstCaps * live_switch_get_sink_caps (GstPad * pad) { GstCaps *result; result = gst_caps_copy (GST_PAD_CAPS (pad)); gst_caps_set_simple (result, "rate", GST_TYPE_INT_RANGE, 48000, G_MAXINT, NULL); return result; } static void live_switch_push (int rate, GstCaps * caps) { GstBuffer *inbuffer; GstCaps *desired; GList *l; desired = gst_caps_copy (caps); gst_caps_set_simple (desired, "rate", G_TYPE_INT, rate, NULL); gst_pad_set_caps (mysrcpad, desired); fail_unless (gst_pad_alloc_buffer_and_set_caps (mysrcpad, GST_BUFFER_OFFSET_NONE, rate * 4, desired, &inbuffer) == GST_FLOW_OK); /* When the basetransform hits the non-configured case it always * returns a buffer with exactly the same caps as we requested so the actual * renegotiation (if needed) will be done in the _chain*/ fail_unless (inbuffer != NULL); GST_DEBUG ("desired: %" GST_PTR_FORMAT ".... got: %" GST_PTR_FORMAT, desired, GST_BUFFER_CAPS (inbuffer)); fail_unless (gst_caps_is_equal (desired, GST_BUFFER_CAPS (inbuffer))); memset (GST_BUFFER_DATA (inbuffer), 0, GST_BUFFER_SIZE (inbuffer)); GST_BUFFER_DURATION (inbuffer) = GST_SECOND; GST_BUFFER_TIMESTAMP (inbuffer) = 0; GST_BUFFER_OFFSET (inbuffer) = 0; /* pushing gives away my reference ... */ fail_unless (gst_pad_push (mysrcpad, inbuffer) == GST_FLOW_OK); /* ... but it ends up being collected on the global buffer list */ fail_unless_equals_int (g_list_length (buffers), 1); for (l = buffers; l; l = l->next) { GstBuffer *buffer = GST_BUFFER (l->data); gst_buffer_unref (buffer); } g_list_free (buffers); buffers = NULL; gst_caps_unref (desired); } GST_START_TEST (test_live_switch) { GstElement *speexresample; GstEvent *newseg; GstCaps *caps; speexresample = setup_speexresample (4, 48000, 48000, 16, FALSE); /* Let the sinkpad act like something that can only handle things of * rate 48000- and can only allocate buffers for that rate, but if someone * tries to get a buffer with a rate higher then 48000 tries to renegotiate * */ gst_pad_set_bufferalloc_function (mysinkpad, live_switch_alloc_only_48000); gst_pad_set_getcaps_function (mysinkpad, live_switch_get_sink_caps); gst_pad_use_fixed_caps (mysrcpad); caps = gst_pad_get_negotiated_caps (mysrcpad); fail_unless (gst_caps_is_fixed (caps)); fail_unless (gst_element_set_state (speexresample, GST_STATE_PLAYING) == GST_STATE_CHANGE_SUCCESS, "could not set to playing"); newseg = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0); fail_unless (gst_pad_push_event (mysrcpad, newseg) != FALSE); /* downstream can provide the requested rate, a buffer alloc will be passed * on */ live_switch_push (48000, caps); /* Downstream can never accept this rate, buffer alloc isn't passed on */ live_switch_push (40000, caps); /* Downstream can provide the requested rate but will re-negotiate */ live_switch_push (50000, caps); cleanup_speexresample (speexresample); gst_caps_unref (caps); } GST_END_TEST; #ifndef GST_DISABLE_PARSE static GMainLoop *loop; static gint messages = 0; static void element_message_cb (GstBus * bus, GstMessage * message, gpointer user_data) { gchar *s; s = gst_structure_to_string (gst_message_get_structure (message)); GST_DEBUG ("Received message: %s", s); g_free (s); messages++; } static void eos_message_cb (GstBus * bus, GstMessage * message, gpointer user_data) { GST_DEBUG ("Received eos"); g_main_loop_quit (loop); } static void test_pipeline (gint width, gboolean fp, gint inrate, gint outrate, gint quality) { GstElement *pipeline; GstBus *bus; GError *error = NULL; gchar *pipe_str; pipe_str = g_strdup_printf ("audiotestsrc num-buffers=10 ! audioconvert ! audio/x-raw-%s,rate=%d,width=%d,channels=2 ! audioresample quality=%d ! audio/x-raw-%s,rate=%d,width=%d ! identity check-imperfect-timestamp=TRUE ! fakesink", (fp) ? "float" : "int", inrate, width, quality, (fp) ? "float" : "int", outrate, width); pipeline = gst_parse_launch (pipe_str, &error); fail_unless (pipeline != NULL, "Error parsing pipeline: %s", error ? error->message : "(invalid error)"); g_free (pipe_str); bus = gst_element_get_bus (pipeline); fail_if (bus == NULL); gst_bus_add_signal_watch (bus); g_signal_connect (bus, "message::element", (GCallback) element_message_cb, NULL); g_signal_connect (bus, "message::eos", (GCallback) eos_message_cb, NULL); gst_element_set_state (pipeline, GST_STATE_PLAYING); /* run until we receive EOS */ loop = g_main_loop_new (NULL, FALSE); g_main_loop_run (loop); g_main_loop_unref (loop); loop = NULL; gst_element_set_state (pipeline, GST_STATE_NULL); fail_if (messages > 0, "Received imperfect timestamp messages"); gst_object_unref (pipeline); } GST_START_TEST (test_pipelines) { gint quality; /* Test qualities 0, 5 and 10 */ for (quality = 0; quality < 11; quality += 5) { test_pipeline (8, FALSE, 44100, 48000, quality); test_pipeline (8, FALSE, 48000, 44100, quality); test_pipeline (16, FALSE, 44100, 48000, quality); test_pipeline (16, FALSE, 48000, 44100, quality); test_pipeline (24, FALSE, 44100, 48000, quality); test_pipeline (24, FALSE, 48000, 44100, quality); test_pipeline (32, FALSE, 44100, 48000, quality); test_pipeline (32, FALSE, 48000, 44100, quality); test_pipeline (32, TRUE, 44100, 48000, quality); test_pipeline (32, TRUE, 48000, 44100, quality); test_pipeline (64, TRUE, 44100, 48000, quality); test_pipeline (64, TRUE, 48000, 44100, quality); } } GST_END_TEST; #endif static Suite * speexresample_suite (void) { Suite *s = suite_create ("speexresample"); TCase *tc_chain = tcase_create ("general"); suite_add_tcase (s, tc_chain); tcase_add_test (tc_chain, test_perfect_stream); tcase_add_test (tc_chain, test_discont_stream); tcase_add_test (tc_chain, test_reuse); tcase_add_test (tc_chain, test_shutdown); tcase_add_test (tc_chain, test_live_switch); #ifndef GST_DISABLE_PARSE tcase_set_timeout (tc_chain, 360); tcase_add_test (tc_chain, test_pipelines); #endif return s; } GST_CHECK_MAIN (speexresample);