1 /* 2 * GStreamer 3 * Copyright (C) 2008 Rov Juvano <rovjuvano@users.sourceforge.net> 4 * 5 * This library is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Library General Public 7 * License as published by the Free Software Foundation; either 8 * version 2 of the License, or (at your option) any later version. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Library General Public License for more details. 14 * 15 * You should have received a copy of the GNU Library General Public 16 * License along with this library; if not, write to the 17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 18 * Boston, MA 02111-1307, USA. 19 */ 20 21 #ifndef __GST_SCALETEMPO_H__ 22 #define __GST_SCALETEMPO_H__ 23 24 #include <gst/gst.h> 25 #include <gst/base/gstbasetransform.h> 26 27 G_BEGIN_DECLS 28 29 #define GST_TYPE_SCALETEMPO (gst_scaletempo_get_type()) 30 #define GST_SCALETEMPO(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_SCALETEMPO, GstScaletempo)) 31 #define GST_SCALETEMPO_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_SCALETEMPO, GstScaletempoClass)) 32 #define GST_IS_SCALETEMPO(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_SCALETEMPO)) 33 #define GST_IS_SCALETEMPO_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_SCALETEMPO)) 34 35 typedef struct _GstScaletempo GstScaletempo; 36 typedef struct _GstScaletempoClass GstScaletempoClass; 37 typedef struct _GstScaletempoPrivate GstScaletempoPrivate; 38 39 struct _GstScaletempo 40 { 41 GstBaseTransform element; 42 43 gdouble scale; 44 gboolean reverse; 45 46 /* parameters */ 47 guint ms_stride; 48 gdouble percent_overlap; 49 guint ms_search; 50 51 /* caps */ 52 GstAudioFormat format; 53 guint samples_per_frame; /* AKA number of channels */ 54 guint bytes_per_sample; 55 guint bytes_per_frame; 56 guint sample_rate; 57 58 /* stride */ 59 gdouble frames_stride_scaled; 60 gdouble frames_stride_error; 61 guint bytes_stride; 62 gdouble bytes_stride_scaled; 63 guint bytes_queue_max; 64 guint bytes_queued; 65 guint bytes_to_slide; 66 gint8 *buf_queue; 67 68 /* overlap */ 69 guint samples_overlap; 70 guint samples_standing; 71 guint bytes_overlap; 72 guint bytes_standing; 73 gpointer buf_overlap; 74 gpointer table_blend; 75 void (*output_overlap) (GstScaletempo * scaletempo, gpointer out_buf, guint bytes_off); 76 77 /* best overlap */ 78 guint frames_search; 79 gpointer buf_pre_corr; 80 gpointer table_window; 81 guint (*best_overlap_offset) (GstScaletempo * scaletempo); 82 83 /* gstreamer */ 84 GstSegment in_segment, out_segment; 85 GstClockTime latency; 86 87 /* threads */ 88 gboolean reinit_buffers; 89 }; 90 91 struct _GstScaletempoClass 92 { 93 GstBaseTransformClass parent_class; 94 }; 95 96 GType gst_scaletempo_get_type (void); 97 98 GST_ELEMENT_REGISTER_DECLARE (scaletempo); 99 100 G_END_DECLS 101 #endif /* __GST_SCALETEMPO_H__ */ 102