2 * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
3 * Copyright (C) 2005 Thomas Vander Stichele <thomas at apestaart dot org>
4 * Copyright (C) 2011 Wim Taymans <wim.taymans at gmail dot com>
6 * gstaudioconvert.c: Convert audio to different audio formats automatically
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:element-audioconvert
27 * Audioconvert converts raw audio buffers between various possible formats.
28 * It supports integer to float conversion, width/depth conversion,
29 * signedness and endianness conversion and channel transformations.
32 * <title>Example launch line</title>
34 * gst-launch -v -m audiotestsrc ! audioconvert ! audio/x-raw,format=S8,channels=2 ! level ! fakesink silent=TRUE
35 * ]| This pipeline converts audio to 8-bit. The level element shows that
36 * the output levels still match the one for a sine wave.
38 * gst-launch -v -m audiotestsrc ! audioconvert ! vorbisenc ! fakesink silent=TRUE
39 * ]| The vorbis encoder takes float audio data instead of the integer data
40 * generated by audiotestsrc.
43 * Last reviewed on 2006-03-02 (0.10.4)
48 * - audioconvert converts buffers in a set of supported caps. If it supports
49 * a caps, it supports conversion from these caps to any other caps it
50 * supports. (example: if it does A=>B and A=>C, it also does B=>C)
51 * - audioconvert does not save state between buffers. Every incoming buffer is
52 * converted and the converted buffer is pushed out.
54 * audioconvert is not supposed to be a one-element-does-anything solution for
64 #include "gstaudioconvert.h"
65 #include "gstchannelmix.h"
66 #include "gstaudioquantize.h"
69 GST_DEBUG_CATEGORY (audio_convert_debug);
70 GST_DEBUG_CATEGORY_STATIC (GST_CAT_PERFORMANCE);
72 /*** DEFINITIONS **************************************************************/
75 static void gst_audio_convert_dispose (GObject * obj);
77 /* gstreamer functions */
78 static gboolean gst_audio_convert_get_unit_size (GstBaseTransform * base,
79 GstCaps * caps, gsize * size);
80 static GstCaps *gst_audio_convert_transform_caps (GstBaseTransform * base,
81 GstPadDirection direction, GstCaps * caps, GstCaps * filter);
82 static GstCaps *gst_audio_convert_fixate_caps (GstBaseTransform * base,
83 GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
84 static gboolean gst_audio_convert_set_caps (GstBaseTransform * base,
85 GstCaps * incaps, GstCaps * outcaps);
86 static GstFlowReturn gst_audio_convert_transform (GstBaseTransform * base,
87 GstBuffer * inbuf, GstBuffer * outbuf);
88 static GstFlowReturn gst_audio_convert_transform_ip (GstBaseTransform * base,
90 static void gst_audio_convert_set_property (GObject * object, guint prop_id,
91 const GValue * value, GParamSpec * pspec);
92 static void gst_audio_convert_get_property (GObject * object, guint prop_id,
93 GValue * value, GParamSpec * pspec);
95 /* AudioConvert signals and args */
110 GST_DEBUG_CATEGORY_INIT (audio_convert_debug, "audioconvert", 0, "audio conversion element"); \
111 GST_DEBUG_CATEGORY_GET (GST_CAT_PERFORMANCE, "GST_PERFORMANCE");
112 #define gst_audio_convert_parent_class parent_class
113 G_DEFINE_TYPE_WITH_CODE (GstAudioConvert, gst_audio_convert,
114 GST_TYPE_BASE_TRANSFORM, DEBUG_INIT);
116 /*** GSTREAMER PROTOTYPES *****************************************************/
118 #define STATIC_CAPS \
119 GST_STATIC_CAPS (GST_AUDIO_CAPS_MAKE (GST_AUDIO_FORMATS_ALL) \
120 ", layout = (string) interleaved")
122 static GstStaticPadTemplate gst_audio_convert_src_template =
123 GST_STATIC_PAD_TEMPLATE ("src",
128 static GstStaticPadTemplate gst_audio_convert_sink_template =
129 GST_STATIC_PAD_TEMPLATE ("sink",
134 #define GST_TYPE_AUDIO_CONVERT_DITHERING (gst_audio_convert_dithering_get_type ())
136 gst_audio_convert_dithering_get_type (void)
138 static GType gtype = 0;
141 static const GEnumValue values[] = {
142 {DITHER_NONE, "No dithering",
144 {DITHER_RPDF, "Rectangular dithering", "rpdf"},
145 {DITHER_TPDF, "Triangular dithering (default)", "tpdf"},
146 {DITHER_TPDF_HF, "High frequency triangular dithering", "tpdf-hf"},
150 gtype = g_enum_register_static ("GstAudioConvertDithering", values);
155 #define GST_TYPE_AUDIO_CONVERT_NOISE_SHAPING (gst_audio_convert_ns_get_type ())
157 gst_audio_convert_ns_get_type (void)
159 static GType gtype = 0;
162 static const GEnumValue values[] = {
163 {NOISE_SHAPING_NONE, "No noise shaping (default)",
165 {NOISE_SHAPING_ERROR_FEEDBACK, "Error feedback", "error-feedback"},
166 {NOISE_SHAPING_SIMPLE, "Simple 2-pole noise shaping", "simple"},
167 {NOISE_SHAPING_MEDIUM, "Medium 5-pole noise shaping", "medium"},
168 {NOISE_SHAPING_HIGH, "High 8-pole noise shaping", "high"},
172 gtype = g_enum_register_static ("GstAudioConvertNoiseShaping", values);
178 /*** TYPE FUNCTIONS ***********************************************************/
180 gst_audio_convert_class_init (GstAudioConvertClass * klass)
182 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
183 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
184 GstBaseTransformClass *basetransform_class = GST_BASE_TRANSFORM_CLASS (klass);
186 gobject_class->dispose = gst_audio_convert_dispose;
187 gobject_class->set_property = gst_audio_convert_set_property;
188 gobject_class->get_property = gst_audio_convert_get_property;
190 g_object_class_install_property (gobject_class, ARG_DITHERING,
191 g_param_spec_enum ("dithering", "Dithering",
192 "Selects between different dithering methods.",
193 GST_TYPE_AUDIO_CONVERT_DITHERING, DITHER_TPDF,
194 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
196 g_object_class_install_property (gobject_class, ARG_NOISE_SHAPING,
197 g_param_spec_enum ("noise-shaping", "Noise shaping",
198 "Selects between different noise shaping methods.",
199 GST_TYPE_AUDIO_CONVERT_NOISE_SHAPING, NOISE_SHAPING_NONE,
200 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
202 gst_element_class_add_pad_template (element_class,
203 gst_static_pad_template_get (&gst_audio_convert_src_template));
204 gst_element_class_add_pad_template (element_class,
205 gst_static_pad_template_get (&gst_audio_convert_sink_template));
206 gst_element_class_set_details_simple (element_class,
207 "Audio converter", "Filter/Converter/Audio",
208 "Convert audio to different formats", "Benjamin Otte <otte@gnome.org>");
210 basetransform_class->get_unit_size =
211 GST_DEBUG_FUNCPTR (gst_audio_convert_get_unit_size);
212 basetransform_class->transform_caps =
213 GST_DEBUG_FUNCPTR (gst_audio_convert_transform_caps);
214 basetransform_class->fixate_caps =
215 GST_DEBUG_FUNCPTR (gst_audio_convert_fixate_caps);
216 basetransform_class->set_caps =
217 GST_DEBUG_FUNCPTR (gst_audio_convert_set_caps);
218 basetransform_class->transform_ip =
219 GST_DEBUG_FUNCPTR (gst_audio_convert_transform_ip);
220 basetransform_class->transform =
221 GST_DEBUG_FUNCPTR (gst_audio_convert_transform);
223 basetransform_class->passthrough_on_same_caps = TRUE;
227 gst_audio_convert_init (GstAudioConvert * this)
229 this->dither = DITHER_TPDF;
230 this->ns = NOISE_SHAPING_NONE;
231 memset (&this->ctx, 0, sizeof (AudioConvertCtx));
233 gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (this), TRUE);
237 gst_audio_convert_dispose (GObject * obj)
239 GstAudioConvert *this = GST_AUDIO_CONVERT (obj);
241 audio_convert_clean_context (&this->ctx);
243 G_OBJECT_CLASS (parent_class)->dispose (obj);
246 /*** GSTREAMER FUNCTIONS ******************************************************/
248 /* BaseTransform vmethods */
250 gst_audio_convert_get_unit_size (GstBaseTransform * base, GstCaps * caps,
257 if (!gst_audio_info_from_caps (&info, caps))
261 GST_INFO_OBJECT (base, "unit_size = %" G_GSIZE_FORMAT, *size);
267 GST_INFO_OBJECT (base, "failed to parse caps to get unit_size");
272 /* copies the given caps */
274 gst_audio_convert_caps_remove_format_info (GstCaps * caps)
279 guint64 channel_mask;
281 res = gst_caps_new_empty ();
283 n = gst_caps_get_size (caps);
284 for (i = 0; i < n; i++) {
285 st = gst_caps_get_structure (caps, i);
287 /* If this is already expressed by the existing caps
288 * skip this structure */
289 if (i > 0 && gst_caps_is_subset_structure (res, st))
292 st = gst_structure_copy (st);
293 gst_structure_remove_field (st, "format");
295 /* Only remove the channels and channel-mask for non-NONE layouts */
296 if (gst_structure_get (st, "channel-mask", GST_TYPE_BITMASK, &channel_mask,
298 if (channel_mask != 0)
299 gst_structure_remove_fields (st, "channel-mask", "channels", NULL);
301 gst_structure_remove_fields (st, "channel-mask", "channels", NULL);
304 gst_caps_append_structure (res, st);
310 /* The caps can be transformed into any other caps with format info removed.
311 * However, we should prefer passthrough, so if passthrough is possible,
312 * put it first in the list. */
314 gst_audio_convert_transform_caps (GstBaseTransform * btrans,
315 GstPadDirection direction, GstCaps * caps, GstCaps * filter)
320 /* Get all possible caps that we can transform to */
321 tmp = gst_audio_convert_caps_remove_format_info (caps);
324 tmp2 = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
325 gst_caps_unref (tmp);
331 GST_DEBUG_OBJECT (btrans, "transformed %" GST_PTR_FORMAT " into %"
332 GST_PTR_FORMAT, caps, result);
337 static const GstAudioChannelPosition default_positions[8][8] = {
340 GST_AUDIO_CHANNEL_POSITION_MONO,
344 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
345 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
347 /* 3 channels (2.1) */
349 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
350 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
351 GST_AUDIO_CHANNEL_POSITION_LFE1,
353 /* 4 channels (4.0) */
355 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
356 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
357 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
358 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
362 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
363 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
364 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
365 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
366 GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
368 /* 6 channels (5.1) */
370 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
371 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
372 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
373 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
374 GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
375 GST_AUDIO_CHANNEL_POSITION_LFE1,
377 /* 7 channels (6.1) */
379 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
380 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
381 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
382 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
383 GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
384 GST_AUDIO_CHANNEL_POSITION_LFE1,
385 GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,
387 /* 8 channels (7.1) */
389 GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
390 GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
391 GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
392 GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
393 GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
394 GST_AUDIO_CHANNEL_POSITION_LFE1,
395 GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
396 GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
401 n_bits_set (guint64 x)
407 for (i = 0; i < 64; i++) {
417 find_suitable_mask (guint64 mask, gint n_chans)
419 guint64 intersection;
424 g_assert (n_bits_set (mask) >= n_chans);
428 intersection = intersection & ((~G_GUINT64_CONSTANT (0)) >> i);
430 } while (n_bits_set (intersection) > n_chans && i < 64);
438 gst_audio_convert_fixate_channels (GstBaseTransform * base, GstStructure * ins,
441 gint in_chans, out_chans;
442 guint64 in_mask = 0, out_mask = 0;
443 gboolean has_in_mask = FALSE, has_out_mask = FALSE;
445 if (!gst_structure_get_int (ins, "channels", &in_chans))
446 return; /* this shouldn't really happen, should it? */
448 if (!gst_structure_has_field (outs, "channels")) {
449 /* we could try to get the implied number of channels from the layout,
450 * but that seems overdoing it for a somewhat exotic corner case */
451 gst_structure_remove_field (outs, "channel-mask");
455 /* ok, let's fixate the channels if they are not fixated yet */
456 gst_structure_fixate_field_nearest_int (outs, "channels", in_chans);
458 if (!gst_structure_get_int (outs, "channels", &out_chans)) {
459 /* shouldn't really happen ... */
460 gst_structure_remove_field (outs, "channel-mask");
464 /* get the channel layout of the output if any */
465 has_out_mask = gst_structure_has_field (outs, "channel-mask");
467 gst_structure_get (outs, "channel-mask", GST_TYPE_BITMASK, &out_mask, NULL);
469 /* channels == 1 => MONO */
470 if (out_chans == 2) {
472 GST_AUDIO_CHANNEL_POSITION_MASK (FRONT_LEFT) |
473 GST_AUDIO_CHANNEL_POSITION_MASK (FRONT_RIGHT);
475 gst_structure_set (outs, "channel-mask", GST_TYPE_BITMASK, out_mask,
480 /* get the channel layout of the input if any */
481 has_in_mask = gst_structure_has_field (ins, "channel-mask");
483 gst_structure_get (ins, "channel-mask", GST_TYPE_BITMASK, &in_mask, NULL);
485 /* channels == 1 => MONO */
488 GST_AUDIO_CHANNEL_POSITION_MASK (FRONT_LEFT) |
489 GST_AUDIO_CHANNEL_POSITION_MASK (FRONT_RIGHT);
491 } else if (in_chans > 2)
492 g_warning ("%s: Upstream caps contain no channel mask",
493 GST_ELEMENT_NAME (base));
496 if (!has_out_mask && out_chans == 1 && (in_chans != out_chans
498 return; /* nothing to do, default layout will be assumed */
500 if (in_chans == out_chans && (has_in_mask || in_chans == 1)) {
501 /* same number of channels and no output layout: just use input layout */
503 /* in_chans == 1 handled above already */
504 gst_structure_set (outs, "channel-mask", GST_TYPE_BITMASK, in_mask, NULL);
508 /* If both masks are the same we're done, this includes the NONE layout case */
509 if (in_mask == out_mask)
512 /* if output layout is fixed already and looks sane, we're done */
513 if (n_bits_set (out_mask) == out_chans)
516 if (n_bits_set (out_mask) < in_chans) {
517 /* Not much we can do here, this shouldn't just happen */
518 g_warning ("%s: Invalid downstream channel-mask with too few bits set",
519 GST_ELEMENT_NAME (base));
521 guint64 intersection;
523 /* if the output layout is not fixed, check if the output layout contains
524 * the input layout */
525 intersection = in_mask & out_mask;
526 if (n_bits_set (intersection) >= in_chans) {
527 gst_structure_set (outs, "channel-mask", GST_TYPE_BITMASK, in_mask,
532 /* output layout is not fixed and does not contain the input layout, so
533 * just pick the first possibility */
534 intersection = find_suitable_mask (out_mask, out_chans);
536 gst_structure_set (outs, "channel-mask", GST_TYPE_BITMASK, intersection,
542 /* ... else fall back to default layout (NB: out_layout is NULL here) */
543 GST_WARNING_OBJECT (base, "unexpected output channel layout");
545 guint64 intersection;
547 /* number of input channels != number of output channels:
548 * if this value contains a list of channel layouts (or even worse: a list
549 * with another list), just pick the first value and repeat until we find a
550 * channel position array or something else that's not a list; we assume
551 * the input if half-way sane and don't try to fall back on other list items
552 * if the first one is something unexpected or non-channel-pos-array-y */
553 if (n_bits_set (out_mask) >= out_chans) {
554 intersection = find_suitable_mask (out_mask, out_chans);
555 gst_structure_set (outs, "channel-mask", GST_TYPE_BITMASK, intersection,
560 /* what now?! Just ignore what we're given and use default positions */
561 GST_WARNING_OBJECT (base, "invalid or unexpected channel-positions");
564 /* missing or invalid output layout and we can't use the input layout for
565 * one reason or another, so just pick a default layout (we could be smarter
566 * and try to add/remove channels from the input layout, or pick a default
567 * layout based on LFE-presence in input layout, but let's save that for
569 if (out_chans > 0 && out_chans <= G_N_ELEMENTS (default_positions[0])) {
572 GST_DEBUG_OBJECT (base, "using default channel layout as fallback");
575 for (i = 0; i < out_chans; i++)
576 out_mask |= G_GUINT64_CONSTANT (1) << default_positions[out_chans - 1][i];
578 gst_structure_set (outs, "channel-mask", GST_TYPE_BITMASK, out_mask, NULL);
580 GST_ERROR_OBJECT (base, "Have no default layout for %d channels",
585 /* try to keep as many of the structure members the same by fixating the
586 * possible ranges; this way we convert the least amount of things as possible
589 gst_audio_convert_fixate_caps (GstBaseTransform * base,
590 GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
592 GstStructure *ins, *outs;
595 GST_DEBUG_OBJECT (base, "trying to fixate othercaps %" GST_PTR_FORMAT
596 " based on caps %" GST_PTR_FORMAT, othercaps, caps);
598 result = gst_caps_intersect (othercaps, caps);
599 if (gst_caps_is_empty (result)) {
601 gst_caps_unref (result);
604 gst_caps_unref (othercaps);
607 /* fixate remaining fields */
608 result = gst_caps_make_writable (result);
610 ins = gst_caps_get_structure (caps, 0);
611 outs = gst_caps_get_structure (result, 0);
613 gst_audio_convert_fixate_channels (base, ins, outs);
614 result = gst_caps_fixate (result);
616 GST_DEBUG_OBJECT (base, "fixated othercaps to %" GST_PTR_FORMAT, result);
622 gst_audio_convert_set_caps (GstBaseTransform * base, GstCaps * incaps,
625 GstAudioConvert *this = GST_AUDIO_CONVERT (base);
626 GstAudioInfo in_info;
627 GstAudioInfo out_info;
629 GST_DEBUG_OBJECT (base, "incaps %" GST_PTR_FORMAT ", outcaps %"
630 GST_PTR_FORMAT, incaps, outcaps);
632 if (!gst_audio_info_from_caps (&in_info, incaps))
634 if (!gst_audio_info_from_caps (&out_info, outcaps))
637 if (!audio_convert_prepare_context (&this->ctx, &in_info, &out_info,
638 this->dither, this->ns))
646 GST_ERROR_OBJECT (base, "invalid input caps");
651 GST_ERROR_OBJECT (base, "invalid output caps");
656 GST_ERROR_OBJECT (base, "could not find converter");
662 gst_audio_convert_transform_ip (GstBaseTransform * base, GstBuffer * buf)
664 /* nothing to do here */
669 gst_audio_convert_transform (GstBaseTransform * base, GstBuffer * inbuf,
673 GstAudioConvert *this = GST_AUDIO_CONVERT (base);
674 GstMapInfo srcmap, dstmap;
675 gint insize, outsize;
679 /* get amount of samples to convert. */
680 samples = gst_buffer_get_size (inbuf) / this->ctx.in.bpf;
682 /* get in/output sizes, to see if the buffers we got are of correct
684 if (!audio_convert_get_sizes (&this->ctx, samples, &insize, &outsize))
687 if (insize == 0 || outsize == 0)
690 /* get src and dst data */
691 gst_buffer_map (inbuf, &srcmap, GST_MAP_READ);
692 gst_buffer_map (outbuf, &dstmap, GST_MAP_WRITE);
694 /* check in and outsize */
695 if (srcmap.size < insize)
697 if (dstmap.size < outsize)
700 /* and convert the samples */
701 if (!GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_GAP)) {
702 if (!audio_convert_convert (&this->ctx, srcmap.data, dstmap.data,
703 samples, gst_buffer_is_writable (inbuf)))
706 /* Create silence buffer */
707 gst_audio_format_fill_silence (this->ctx.out.finfo, dstmap.data, outsize);
712 gst_buffer_unmap (outbuf, &dstmap);
713 gst_buffer_unmap (inbuf, &srcmap);
720 GST_ELEMENT_ERROR (this, STREAM, FORMAT,
721 (NULL), ("cannot get input/output sizes for %d samples", samples));
722 return GST_FLOW_ERROR;
726 GST_ELEMENT_ERROR (this, STREAM, FORMAT,
728 ("input/output buffers are of wrong size in: %" G_GSIZE_FORMAT " < %d"
729 " or out: %" G_GSIZE_FORMAT " < %d",
730 srcmap.size, insize, dstmap.size, outsize));
731 ret = GST_FLOW_ERROR;
736 GST_ELEMENT_ERROR (this, STREAM, FORMAT,
737 (NULL), ("error while converting"));
738 ret = GST_FLOW_ERROR;
744 gst_audio_convert_set_property (GObject * object, guint prop_id,
745 const GValue * value, GParamSpec * pspec)
747 GstAudioConvert *this = GST_AUDIO_CONVERT (object);
751 this->dither = g_value_get_enum (value);
753 case ARG_NOISE_SHAPING:
754 this->ns = g_value_get_enum (value);
757 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
763 gst_audio_convert_get_property (GObject * object, guint prop_id,
764 GValue * value, GParamSpec * pspec)
766 GstAudioConvert *this = GST_AUDIO_CONVERT (object);
770 g_value_set_enum (value, this->dither);
772 case ARG_NOISE_SHAPING:
773 g_value_set_enum (value, this->ns);
776 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);