1 /* GStreamer pitch controller element 2 * Copyright (C) 2006 Wouter Paesen <wouter@blue-gate.be> 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with this library; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 * 18 */ 19 20 #ifndef __GST_PITCH_H__ 21 #define __GST_PITCH_H__ 22 23 #include <gst/gst.h> 24 #include <gst/audio/audio.h> 25 26 G_BEGIN_DECLS 27 28 #define GST_TYPE_PITCH \ 29 (gst_pitch_get_type()) 30 #define GST_PITCH(obj) \ 31 (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PITCH,GstPitch)) 32 #define GST_PITCH_CLASS(klass) \ 33 (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PITCH,GstPitchClass)) 34 #define GST_IS_PITCH(obj) \ 35 (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PITCH)) 36 #define GST_IS_PITCH_CLASS(klass) \ 37 (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PITCH)) 38 39 typedef struct _GstPitch GstPitch; 40 typedef struct _GstPitchClass GstPitchClass; 41 typedef struct _GstPitchPrivate GstPitchPrivate; 42 43 44 struct _GstPitch 45 { 46 GstElement element; 47 48 GstPad *srcpad; 49 GstPad *sinkpad; 50 51 /* parameter values */ 52 gfloat tempo; /* time stretch 53 * change the duration, without affecting the pitch 54 * > 1 makes the stream shorter 55 */ 56 57 gfloat rate; /* change playback rate 58 * resample 59 * > 1 makes the stream shorter 60 */ 61 62 gfloat out_seg_rate; /* change output segment rate 63 * Affects playback when input 64 * segments have rate != out_rate 65 */ 66 67 gfloat pitch; /* change pitch 68 * change the pitch without affecting the 69 * duration, stream length doesn't change 70 */ 71 72 gfloat seg_arate; /* Rate to apply from input segment */ 73 74 /* values extracted from caps */ 75 GstAudioInfo info; 76 77 /* stream tracking */ 78 GstClockTime next_buffer_time; 79 gint64 next_buffer_offset; 80 81 GstClockTimeDiff min_latency, max_latency; 82 83 GstPitchPrivate *priv; 84 }; 85 86 struct _GstPitchClass 87 { 88 GstElementClass parent_class; 89 }; 90 91 GType gst_pitch_get_type (void); 92 GST_ELEMENT_REGISTER_DECLARE (pitch); 93 94 G_END_DECLS 95 96 #endif /* __GST_PITCH_H__ */ 97