1 //------------------------------------------------------------------------------ 2 // Copyright (c) 2001-2002, OpenBeOS 3 // 4 // Permission is hereby granted, free of charge, to any person obtaining a 5 // copy of this software and associated documentation files (the "Software"), 6 // to deal in the Software without restriction, including without limitation 7 // the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 // and/or sell copies of the Software, and to permit persons to whom the 9 // Software is furnished to do so, subject to the following conditions: 10 // 11 // The above copyright notice and this permission notice shall be included in 12 // all copies or substantial portions of the Software. 13 // 14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 19 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 20 // DEALINGS IN THE SOFTWARE. 21 // 22 // File Name: GameSoundDevice.h 23 // Author: Christopher ML Zumwalt May (zummy@users.sf.net) 24 // Description: Utility functions used by sound system 25 //------------------------------------------------------------------------------ 26 27 // Standard Includes ----------------------------------------------------------- 28 29 // System Includes ------------------------------------------------------------- 30 #include <MediaDefs.h> 31 32 // Project Includes ------------------------------------------------------------ 33 #include <GameSoundDefs.h> 34 35 // Local Includes -------------------------------------------------------------- 36 #include <GSUtility.h> 37 38 // Local Defines --------------------------------------------------------------- 39 40 // Utility functions ----------------------------------------------------------- 41 _gs_ramp* InitRamp(float* value, float set, float frames, bigtime_t duration) 42 { 43 float diff = (set > *value) ? set - *value : *value - set; 44 bigtime_t sec = bigtime_t(duration / 1000000.0); 45 float inc = diff * 200; 46 47 _gs_ramp* ramp = new _gs_ramp; 48 ramp->value = value; 49 50 ramp->frame_total = frames * sec; 51 ramp->frame_inc = int(ramp->frame_total / inc); 52 53 ramp->inc = (set - *value) / inc; 54 55 ramp->frame_count = 0; 56 ramp->frame_inc_count = 0; 57 58 ramp->duration = duration; 59 60 return ramp; 61 } 62 63 bool ChangeRamp(_gs_ramp* ramp) 64 { 65 if (ramp->frame_count > ramp->frame_total) return true; 66 67 if (ramp->frame_inc_count >= ramp->frame_inc) 68 { 69 ramp->frame_inc_count = 0; 70 *ramp->value += ramp->inc; 71 } 72 else ramp->frame_inc_count++; 73 74 ramp->frame_count++; 75 return false; 76 } 77 78 size_t get_sample_size(int32 format) 79 { 80 size_t sample; 81 82 switch(format) 83 { 84 case media_raw_audio_format::B_AUDIO_CHAR: 85 sample = sizeof(char); 86 break; 87 88 case gs_audio_format::B_GS_U8: 89 sample = sizeof(uint8); 90 break; 91 92 case gs_audio_format::B_GS_S16: 93 sample = sizeof(int16); 94 break; 95 96 case gs_audio_format::B_GS_S32: 97 sample = sizeof(int32); 98 break; 99 100 case gs_audio_format::B_GS_F: 101 sample = sizeof(float); 102 break; 103 104 default: sample = 0; 105 } 106 107 return sample; 108 } 109 110 void media_to_gs_format(gs_audio_format* dest, media_raw_audio_format* source) 111 { 112 dest->format = source->format; 113 dest->frame_rate = source->frame_rate; 114 dest->channel_count = source->channel_count; 115 dest->byte_order = source->byte_order; 116 dest->buffer_size = source->buffer_size; 117 } 118