diff options
Diffstat (limited to 'gst/audiofx/audiopanorama.c')
| -rw-r--r-- | gst/audiofx/audiopanorama.c | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/gst/audiofx/audiopanorama.c b/gst/audiofx/audiopanorama.c new file mode 100644 index 00000000..760f6ed0 --- /dev/null +++ b/gst/audiofx/audiopanorama.c @@ -0,0 +1,365 @@ +/* + * GStreamer + * Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net> + * + * 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. + */ + +/** + * SECTION:gstaudiopanorama + * @short_description: audio strereo pan effect + * + * <refsect2> + * Echo effect with controllable effect-ratio, delay-time and feedback. + * <title>Example launch line</title> + * <para> + * <programlisting> + * gst-launch audiotestsrc wave=saw ! audiopanorama panorama=-100 ! alsasink + * gst-launch filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audiopanorama panorama=-100 ! alsasink + * </programlisting> + * In the latter example the echo is applied to the input signal of the + * soundcard (like a microphone). + * </para> + * </refsect2> + */ + +/* FIXME: also support 32/64 bit float audio, and maybe 8/24 bit integer */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <gst/gst.h> +#include <gst/base/gstbasetransform.h> +#include <gst/controller/gstcontroller.h> + +#include "audiopanorama.h" + +#define GST_CAT_DEFAULT gst_audio_panorama_debug +GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT); + +static const GstElementDetails element_details = +GST_ELEMENT_DETAILS ("AudioPanorama", + "Filter/Effect/Audio", + "Positions audio streams in the stereo panorama", + "Stefan Kost <ensonic@users.sf.net>"); + +/* Filter signals and args */ +enum +{ + /* FILL ME */ + LAST_SIGNAL +}; + +enum +{ + PROP_0, + PROP_PANORAMA +}; + +static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink", + GST_PAD_SINK, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("audio/x-raw-int, " + "rate = (int) [ 1, MAX ], " + "channels = (int) [ 1, 2 ], " + "endianness = (int) BYTE_ORDER, " + "width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true") + ); + +static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", + GST_PAD_SRC, + GST_PAD_ALWAYS, + GST_STATIC_CAPS ("audio/x-raw-int, " + "rate = (int) [ 1, MAX ], " + "channels = (int) 2, " + "endianness = (int) BYTE_ORDER, " + "width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true") + ); + +#define DEBUG_INIT(bla) \ + GST_DEBUG_CATEGORY_INIT (gst_audio_panorama_debug, "audiopanorama", 0, "audiopanorama plugin"); + +GST_BOILERPLATE_FULL (GstAudioPanorama, gst_audio_panorama, GstBaseTransform, + GST_TYPE_BASE_TRANSFORM, DEBUG_INIT); + +static void gst_audio_panorama_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec); +static void gst_audio_panorama_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec); + +static gboolean gst_audio_panorama_get_unit_size (GstBaseTransform * base, + GstCaps * caps, guint * size); +static GstCaps *gst_audio_panorama_transform_caps (GstBaseTransform * base, + GstPadDirection direction, GstCaps * caps); +static gboolean gst_audio_panorama_set_caps (GstBaseTransform * base, + GstCaps * incaps, GstCaps * outcaps); + +static void gst_audio_panorama_transform_m2s (GstAudioPanorama * filter, + gint16 * idata, gint16 * odata, guint num_samples); +static void gst_audio_panorama_transform_s2s (GstAudioPanorama * filter, + gint16 * idata, gint16 * odata, guint num_samples); + +static GstFlowReturn gst_audio_panorama_transform (GstBaseTransform * base, + GstBuffer * inbuf, GstBuffer * outbuf); + +/* GObject vmethod implementations */ + +static void +gst_audio_panorama_base_init (gpointer klass) +{ + GstElementClass *element_class = GST_ELEMENT_CLASS (klass); + + gst_element_class_add_pad_template (element_class, + gst_static_pad_template_get (&src_template)); + gst_element_class_add_pad_template (element_class, + gst_static_pad_template_get (&sink_template)); + gst_element_class_set_details (element_class, &element_details); +} + +static void +gst_audio_panorama_class_init (GstAudioPanoramaClass * klass) +{ + GObjectClass *gobject_class; + + gobject_class = (GObjectClass *) klass; + gobject_class->set_property = gst_audio_panorama_set_property; + gobject_class->get_property = gst_audio_panorama_get_property; + + g_object_class_install_property (gobject_class, PROP_PANORAMA, + g_param_spec_int ("panorama", "Panorama", + "Position in stereo panorama (-100 left -> 100 right)", -100, 100, 0, + G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE)); + + GST_BASE_TRANSFORM_CLASS (klass)->get_unit_size = + GST_DEBUG_FUNCPTR (gst_audio_panorama_get_unit_size); + GST_BASE_TRANSFORM_CLASS (klass)->transform_caps = + GST_DEBUG_FUNCPTR (gst_audio_panorama_transform_caps); + GST_BASE_TRANSFORM_CLASS (klass)->set_caps = + GST_DEBUG_FUNCPTR (gst_audio_panorama_set_caps); + GST_BASE_TRANSFORM_CLASS (klass)->transform = + GST_DEBUG_FUNCPTR (gst_audio_panorama_transform); +} + +static void +gst_audio_panorama_init (GstAudioPanorama * filter, + GstAudioPanoramaClass * klass) +{ + filter->panorama = 0; +} + +static void +gst_audio_panorama_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec) +{ + GstAudioPanorama *filter = GST_AUDIO_PANORAMA (object); + + switch (prop_id) { + case PROP_PANORAMA: + filter->panorama = g_value_get_int (value); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +gst_audio_panorama_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec) +{ + GstAudioPanorama *filter = GST_AUDIO_PANORAMA (object); + + switch (prop_id) { + case PROP_PANORAMA: + g_value_set_int (value, filter->panorama); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +/* GstBaseTransform vmethod implementations */ + +static gboolean +gst_audio_panorama_get_unit_size (GstBaseTransform * base, GstCaps * caps, + guint * size) +{ + gint width, channels; + GstStructure *structure; + gboolean ret; + + g_assert (size); + + /* this works for both float and int */ + structure = gst_caps_get_structure (caps, 0); + ret = gst_structure_get_int (structure, "width", &width); + ret &= gst_structure_get_int (structure, "channels", &channels); + + *size = width * channels / 8; + + return ret; +} + +static GstCaps * +gst_audio_panorama_transform_caps (GstBaseTransform * base, + GstPadDirection direction, GstCaps * caps) +{ + GstCaps *res; + GstStructure *structure; + + /* transform caps gives one single caps so we can just replace + * the channel property with our range. */ + res = gst_caps_copy (caps); + structure = gst_caps_get_structure (res, 0); + if (direction == GST_PAD_SRC) { + GST_INFO ("allow 1-2 channels"); + gst_structure_set (structure, "channels", GST_TYPE_INT_RANGE, 1, 2, NULL); + } else { + GST_INFO ("allow 2 channels"); + gst_structure_set (structure, "channels", G_TYPE_INT, 2, NULL); + } + + return res; +} + +static gboolean +gst_audio_panorama_set_caps (GstBaseTransform * base, GstCaps * incaps, + GstCaps * outcaps) +{ + GstAudioPanorama *filter = GST_AUDIO_PANORAMA (base); + const GstStructure *structure; + gboolean ret; + gint channels; + + /*GST_INFO ("incaps are %" GST_PTR_FORMAT, incaps); */ + + structure = gst_caps_get_structure (incaps, 0); + ret = gst_structure_get_int (structure, "channels", &channels); + if (!ret) + goto no_channels; + /* FIXME: also check width and gst_structure_get_name()?int/float */ + + GST_DEBUG ("try to process input with %d channels", channels); + + /* set processing function */ + switch (channels) { + case 1: + filter->process = gst_audio_panorama_transform_m2s; + ret = TRUE; + break; + case 2: + filter->process = gst_audio_panorama_transform_s2s; + ret = TRUE; + break; + default: + filter->process = NULL; + ret = FALSE; + GST_WARNING ("can't process input with %d channels", channels); + } + +no_channels: + GST_DEBUG ("no channels in caps"); + return ret; +} + +static void +gst_audio_panorama_transform_m2s (GstAudioPanorama * filter, gint16 * idata, + gint16 * odata, guint num_samples) +{ + guint i; + gdouble val; + glong lval, rval; + gdouble rpan, lpan; + + /* pan: -100 0 100 + * lpan: 1.0 0.5 0.0 + * rpan: 0.0 0.5 1.0 + */ + rpan = (gdouble) (filter->panorama + 100) / 200.0; + lpan = 1.0 - rpan; + + for (i = 0; i < num_samples; i++) { + val = (gdouble) * idata++; + + lval = (glong) (val * lpan); + rval = (glong) (val * rpan); + + *odata++ = (gint16) CLAMP (lval, G_MININT16, G_MAXINT16); + *odata++ = (gint16) CLAMP (rval, G_MININT16, G_MAXINT16); + } +} + +static void +gst_audio_panorama_transform_s2s (GstAudioPanorama * filter, gint16 * idata, + gint16 * odata, guint num_samples) +{ + guint i; + glong lval, rval; + gdouble lival, rival; + gdouble lrpan, llpan, rrpan, rlpan; + + /* pan: -100 0 100 + * llpan: 1.0 1.0 0.0 + * lrpan: 1.0 0.0 0.0 + * rrpan: 0.0 1.0 1.0 + * rlpan: 0.0 0.0 1.0 + */ + if (filter->panorama > 0) { + rlpan = (gdouble) filter->panorama / 100.0; + llpan = 1.0 - rlpan; + lrpan = 0.0; + rrpan = 1.0; + } else { + rrpan = (gdouble) (100 + filter->panorama) / 100.0; + lrpan = 1.0 - rrpan; + rlpan = 0.0; + llpan = 1.0; + } + + for (i = 0; i < num_samples; i++) { + lival = (gdouble) * idata++; + rival = (gdouble) * idata++; + + lval = lival * llpan + rival * lrpan; + rval = lival * rlpan + rival * rrpan; + + *odata++ = (gint16) CLAMP (lval, G_MININT16, G_MAXINT16); + *odata++ = (gint16) CLAMP (rval, G_MININT16, G_MAXINT16); + } +} + +/* this function does the actual processing + */ +static GstFlowReturn +gst_audio_panorama_transform (GstBaseTransform * base, GstBuffer * inbuf, + GstBuffer * outbuf) +{ + GstAudioPanorama *filter = GST_AUDIO_PANORAMA (base); + guint num_samples = GST_BUFFER_SIZE (outbuf) / (2 * sizeof (gint16)); + + if (!gst_buffer_is_writable (outbuf)) + return GST_FLOW_OK; + + if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (outbuf))) + gst_object_sync_values (G_OBJECT (filter), GST_BUFFER_TIMESTAMP (outbuf)); + + filter->process (filter, (gint16 *) GST_BUFFER_DATA (inbuf), + (gint16 *) GST_BUFFER_DATA (outbuf), num_samples); + + return GST_FLOW_OK; +} |