(svn r2685) -Codechange: Split the music/sound/video drivers into separate files and move them into subfolders.

This results in shorter and hopefully easier to maintain files.
Note: I had to change paths in #include statements of some unrelated files, because I added the ottd base directory to the include path (-I.)

sound/null.c

@@ -0,0 +1,11 @@
+#include "stdafx.h"
+#include "openttd.h"
+#include "sound/null.h"
+
+static const char *NullSoundStart(const char * const *parm) { return NULL; }
+static void NullSoundStop(void) {}
+
+const HalSoundDriver _null_sound_driver = {
+	NullSoundStart,
+	NullSoundStop,
+};

sound/null.h

@@ -0,0 +1,8 @@
+#ifndef SOUND_NULL_H
+#define SOUND_NULL_H
+
+#include "hal.h"
+
+extern const HalSoundDriver _null_sound_driver;
+
+#endif

sound/sdl.c

@@ -0,0 +1,40 @@
+#include "stdafx.h"
+#include "openttd.h"
+#include "driver.h"
+#include "mixer.h"
+#include "sdl.h"
+#include "sound/sdl.h"
+#include <SDL.h>
+
+static void CDECL fill_sound_buffer(void *userdata, Uint8 *stream, int len)
+{
+	MxMixSamples(_mixer, stream, len / 4);
+}
+
+static const char *SdlSoundStart(const char * const *parm)
+{
+	SDL_AudioSpec spec;
+
+	const char *s = SdlOpen(SDL_INIT_AUDIO);
+	if (s != NULL) return s;
+
+	spec.freq = GetDriverParamInt(parm, "hz", 11025);
+	spec.format = AUDIO_S16SYS;
+	spec.channels = 2;
+	spec.samples = 512;
+	spec.callback = fill_sound_buffer;
+	SDL_CALL SDL_OpenAudio(&spec, &spec);
+	SDL_CALL SDL_PauseAudio(0);
+	return NULL;
+}
+
+static void SdlSoundStop(void)
+{
+	SDL_CALL SDL_CloseAudio();
+	SdlClose(SDL_INIT_AUDIO);
+}
+
+const HalSoundDriver _sdl_sound_driver = {
+	SdlSoundStart,
+	SdlSoundStop,
+};

sound/sdl.h

@@ -0,0 +1,8 @@
+#ifndef SOUND_SDL_H
+#define SOUND_SDL_H
+
+#include "hal.h"
+
+extern const HalSoundDriver _sdl_sound_driver;
+
+#endif

sound/win32.c

@@ -0,0 +1,84 @@
+#include "stdafx.h"
+#include "openttd.h"
+#include "driver.h"
+#include "functions.h"
+#include "mixer.h"
+#include "sound/win32.h"
+#include <windows.h>
+
+static HWAVEOUT _waveout;
+static WAVEHDR _wave_hdr[2];
+static int _bufsize;
+
+static void PrepareHeader(WAVEHDR *hdr)
+{
+	hdr->dwBufferLength = _bufsize * 4;
+	hdr->dwFlags = 0;
+	hdr->lpData = malloc(_bufsize * 4);
+	if (hdr->lpData == NULL ||
+			waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)
+		error("waveOutPrepareHeader failed");
+}
+
+static void FillHeaders(void)
+{
+	WAVEHDR *hdr;
+
+	for (hdr = _wave_hdr; hdr != endof(_wave_hdr); hdr++) {
+		if (!(hdr->dwFlags & WHDR_INQUEUE)) {
+			MxMixSamples(_mixer, hdr->lpData, hdr->dwBufferLength / 4);
+			if (waveOutWrite(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR)
+				error("waveOutWrite failed");
+		}
+	}
+}
+
+static void CALLBACK waveOutProc(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance,
+	DWORD dwParam1, DWORD dwParam2)
+{
+	switch (uMsg) {
+		case WOM_DONE:
+			if (_waveout) FillHeaders();
+			break;
+
+		default:
+			break;
+	}
+}
+
+static const char *Win32SoundStart(const char* const* parm)
+{
+	WAVEFORMATEX wfex;
+	int hz;
+
+	_bufsize = GetDriverParamInt(parm, "bufsize", 1024);
+	hz = GetDriverParamInt(parm, "hz", 11025);
+	wfex.wFormatTag = WAVE_FORMAT_PCM;
+	wfex.nChannels = 2;
+	wfex.nSamplesPerSec = hz;
+	wfex.nAvgBytesPerSec = hz * 2 * 2;
+	wfex.nBlockAlign = 4;
+	wfex.wBitsPerSample = 16;
+	if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD)&waveOutProc, 0, CALLBACK_FUNCTION) != MMSYSERR_NOERROR)
+		return "waveOutOpen failed";
+	PrepareHeader(&_wave_hdr[0]);
+	PrepareHeader(&_wave_hdr[1]);
+	FillHeaders();
+	return NULL;
+}
+
+static void Win32SoundStop(void)
+{
+	HWAVEOUT waveout = _waveout;
+
+	_waveout = NULL;
+	waveOutReset(waveout);
+	waveOutUnprepareHeader(waveout, &_wave_hdr[0], sizeof(WAVEHDR));
+	waveOutUnprepareHeader(waveout, &_wave_hdr[1], sizeof(WAVEHDR));
+	waveOutClose(waveout);
+}
+
+const HalSoundDriver _win32_sound_driver = {
+	Win32SoundStart,
+	Win32SoundStop,
+};

sound/win32.h

@@ -0,0 +1,8 @@
+#ifndef SOUND_WIN32_H
+#define SOUND_WIN32_H
+
+#include "hal.h"
+
+extern const HalSoundDriver _win32_sound_driver;
+
+#endif