diff options
Diffstat (limited to 'plugins/gme/Game_Music_Emu-0.5.2/player/Audio_Scope.cpp')
| -rw-r--r-- | plugins/gme/Game_Music_Emu-0.5.2/player/Audio_Scope.cpp | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/player/Audio_Scope.cpp b/plugins/gme/Game_Music_Emu-0.5.2/player/Audio_Scope.cpp deleted file mode 100644 index 74cb2c32..00000000 --- a/plugins/gme/Game_Music_Emu-0.5.2/player/Audio_Scope.cpp +++ /dev/null @@ -1,198 +0,0 @@ -// Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ - -#include "Audio_Scope.h" - -#include <assert.h> -#include <stdlib.h> - -/* Copyright (C) 2005-2006 by Shay Green. Permission is hereby granted, free of -charge, to any person obtaining a copy of this software module and associated -documentation files (the "Software"), to deal in the Software without -restriction, including without limitation the rights to use, copy, modify, -merge, publish, distribute, sublicense, and/or sell copies of the Software, and -to permit persons to whom the Software is furnished to do so, subject to the -following conditions: The above copyright notice and this permission notice -shall be included in all copies or substantial portions of the Software. THE -SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, -INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A -PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR -COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER -IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN -CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ - -int const step_bits = 8; -int const step_unit = 1 << step_bits; -int const erase_color = 1; -int const draw_color = 2; - -Audio_Scope::Audio_Scope() -{ - surface = 0; - buf = 0; -} - -Audio_Scope::~Audio_Scope() -{ - free( buf ); - - if ( surface ) - SDL_FreeSurface( surface ); -} - -const char* Audio_Scope::init( int width, int height ) -{ - assert( height <= 256 ); - assert( !buf ); // can only call init() once - - buf = (byte*) calloc( width * sizeof *buf, 1 ); - if ( !buf ) - return "Out of memory"; - - low_y = 0; - high_y = height; - buf_size = width; - - for ( sample_shift = 6; sample_shift < 14; ) - if ( ((0x7FFFL * 2) >> sample_shift++) < height ) - break; - - v_offset = height / 2 - (0x10000 >> sample_shift); - - screen = SDL_SetVideoMode( width, height, 0, 0 ); - if ( !screen ) - return "Couldn't set video mode"; - - surface = SDL_CreateRGBSurface( SDL_SWSURFACE, width, height, 8, 0, 0, 0, 0 ); - if ( !screen ) - return "Couldn't create surface"; - - static SDL_Color palette [2] = { {0, 0, 0}, {0, 255, 0} }; - SDL_SetColors( surface, palette, 1, 2 ); - - return 0; // success -} - -const char* Audio_Scope::draw( const short* in, long count, double step ) -{ - int low = low_y; - int high = high_y; - - if ( count >= buf_size ) - { - count = buf_size; - low_y = 0x7FFF; - high_y = 0; - } - - if ( SDL_LockSurface( surface ) < 0 ) - return "Couldn't lock surface"; - render( in, count, (long) (step * step_unit) ); - SDL_UnlockSurface( surface ); - - if ( low > low_y ) - low = low_y; - - if ( high < high_y ) - high = high_y; - - SDL_Rect r; - r.x = 0; - r.w = buf_size; - r.y = low + v_offset; - r.h = high - low + 1; - - if ( SDL_BlitSurface( surface, &r, screen, &r ) < 0 ) - return "Blit to screen failed"; - - if ( SDL_Flip( screen ) < 0 ) - return "Couldn't flip screen"; - - return 0; // success -} - -void Audio_Scope::render( short const* in, long count, long step ) -{ - byte* old_pos = buf; - long surface_pitch = surface->pitch; - byte* out = (byte*) surface->pixels + v_offset * surface_pitch; - int old_erase = *old_pos; - int old_draw = 0; - long in_pos = 0; - - int low_y = this->low_y; - int high_y = this->high_y; - int half_step = (step + step_unit / 2) >> (step_bits + 1); - - while ( count-- ) - { - // Line drawing/erasing starts at previous sample and ends one short of - // current sample, except when previous and current are the same. - - // Extra read on the last iteration of line loops will always be at the - // height of the next sample, and thus within the gworld bounds. - - // Erase old line - { - int delta = *old_pos - old_erase; - int offset = old_erase * surface_pitch; - old_erase += delta; - - int next_line = surface_pitch; - if ( delta < 0 ) - { - delta = -delta; - next_line = -surface_pitch; - } - - do - { - out [offset] = erase_color; - offset += next_line; - } - while ( delta-- > 1 ); - } - - // Draw new line and put in old_buf - { - - int in_whole = in_pos >> step_bits; - int sample = (0x7FFF * 2 - in [in_whole] - in [in_whole + half_step]) >> sample_shift; - if ( !in_pos ) - old_draw = sample; - in_pos += step; - - int delta = sample - old_draw; - int offset = old_draw * surface_pitch; - old_draw += delta; - - int next_line = surface_pitch; - if ( delta < 0 ) - { - delta = -delta; - next_line = -surface_pitch; - } - - *old_pos++ = sample; - - // min/max updating can be interleved anywhere - - if ( low_y > sample ) - low_y = sample; - - do - { - out [offset] = draw_color; - offset += next_line; - } - while ( delta-- > 1 ); - - if ( high_y < sample ) - high_y = sample; - } - - out++; - } - - this->low_y = low_y; - this->high_y = high_y; -} |