From d4056662a4c70bf2817d470694a3506bb35f0b7f Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Fri, 9 Mar 2007 22:50:48 +0000
Subject: Move the pcsound library to the top level, alongside textscreen.

Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 849
---
 src/pcsound/pcsound_sdl.c | 179 ----------------------------------------------
 1 file changed, 179 deletions(-)
 delete mode 100644 src/pcsound/pcsound_sdl.c

(limited to 'src/pcsound/pcsound_sdl.c')

diff --git a/src/pcsound/pcsound_sdl.c b/src/pcsound/pcsound_sdl.c
deleted file mode 100644
index 50820394..00000000
--- a/src/pcsound/pcsound_sdl.c
+++ /dev/null
@@ -1,179 +0,0 @@
-// Emacs style mode select   -*- C++ -*- 
-//-----------------------------------------------------------------------------
-//
-// Copyright(C) 2007 Simon Howard
-//
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License
-// as published by the Free Software Foundation; either version 2
-// of the License, or (at your option) any later version.
-//
-// This program 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 General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program; if not, write to the Free Software
-// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-// 02111-1307, USA.
-//
-// DESCRIPTION:
-//    PC speaker interface.
-//
-//-----------------------------------------------------------------------------
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "SDL.h"
-#include "SDL_mixer.h"
-
-#include "pcsound.h"
-
-#define SQUARE_WAVE_AMP 0x2000
-
-static pcsound_callback_func callback;
-
-// Output sound format
-
-static int mixing_freq;
-static Uint16 mixing_format;
-static int mixing_channels;
-
-// Currently playing sound
-// current_remaining is the number of remaining samples that must be played
-// before we invoke the callback to get the next frequency.
-
-static int current_remaining;
-static int current_freq;
-
-static int phase_offset = 0;
-
-// Mixer function that does the PC speaker emulation
-
-static void PCSound_Mix_Callback(void *udata, Uint8 *stream, int len)
-{
-    Sint16 *leftptr;
-    Sint16 *rightptr;
-    Sint16 this_value;
-    int oldfreq;
-    int i;
-    int nsamples;
-
-    // Number of samples is quadrupled, because of 16-bit and stereo
-
-    nsamples = len / 4;
-
-    leftptr = (Sint16 *) stream;
-    rightptr = ((Sint16 *) stream) + 1;
-    
-    // Fill the output buffer
-
-    for (i=0; i<nsamples; ++i)
-    {
-        // Has this sound expired? If so, invoke the callback to get 
-        // the next frequency.
-
-        while (current_remaining == 0) 
-        {
-            oldfreq = current_freq;
-
-            // Get the next frequency to play
-
-            callback(&current_remaining, &current_freq);
-
-            if (current_freq != 0)
-            {
-                // Adjust phase to match to the new frequency.
-                // This gives us a smooth transition between different tones,
-                // with no impulse changes.
-
-                phase_offset = (phase_offset * oldfreq) / current_freq;
-            }
-
-            current_remaining = (current_remaining * mixing_freq) / 1000;
-        }
-
-        // Set the value for this sample.
-        
-        if (current_freq == 0)
-        {
-            // Silence
-
-            this_value = 0;
-        }
-        else 
-        {
-            int frac;
-
-            // Determine whether we are at a peak or trough in the current
-            // sound.  Multiply by 2 so that frac % 2 will give 0 or 1 
-            // depending on whether we are at a peak or trough.
-
-            frac = (phase_offset * current_freq * 2) / mixing_freq;
-
-            if ((frac % 2) == 0) 
-            {
-                this_value = SQUARE_WAVE_AMP;
-            }
-            else
-            {
-                this_value = -SQUARE_WAVE_AMP;
-            }
-
-            ++phase_offset;
-        }
-
-        --current_remaining;
-
-        // Use the same value for the left and right channels.
-
-        *leftptr += this_value;
-        *rightptr += this_value;
-
-        leftptr += 2;
-        rightptr += 2;
-    }
-}
-
-static int PCSound_SDL_Init(pcsound_callback_func callback_func)
-{
-    // Check that SDL_mixer has been opened already
-    // If not, fail
-
-    if (!Mix_QuerySpec(&mixing_freq, &mixing_format, &mixing_channels))
-    {
-        return 0;
-    }
-
-    // Only supports AUDIO_S16SYS
-
-    if (mixing_format != AUDIO_S16SYS || mixing_channels != 2)
-    {
-        fprintf(stderr, 
-                "PCSound_SDL only supports native signed 16-bit LSB, "
-                "stereo format!\n");
-        return 0;
-    }
-
-    callback = callback_func;
-    current_freq = 0;
-    current_remaining = 0;
-
-    Mix_SetPostMix(PCSound_Mix_Callback, NULL);
-
-    return 1;
-}
-
-static void PCSound_SDL_Shutdown(void)
-{
-}
-
-pcsound_driver_t pcsound_sdl_driver = 
-{
-    "SDL",
-    PCSound_SDL_Init,
-    PCSound_SDL_Shutdown,
-};
-
-- 
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