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(svn r12009) -Fix [FS#1707]: Avoid loading sample.cat if it 'looks' incorrect, and avoid later null pointer dereferences by moving volume lookup deeper.

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peter1138 2008-01-29 13:27:31 +00:00
parent 02f774793b
commit b20d220333
1 changed files with 29 additions and 22 deletions
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51
src/sound.cpp
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@ -14,6 +14,7 @@
#include "core/alloc_func.hpp"
#include "map_func.h"
#include "vehicle_base.h"
#include "debug.h"
static uint _file_count;
static FileEntry *_files;
@ -25,12 +26,20 @@ MusicFileSettings msf;
static void OpenBankFile(const char *filename)
{
uint count;
uint i;
FioOpenFile(SOUND_SLOT, filename);
uint pos = FioGetPos();
count = FioReadDword() / 8;
uint count = FioReadDword() / 8;
/* Simple check for the correct number of original sounds. */
if (count != 73) {
DEBUG(misc, 6, "Incorrect number of sounds in '%s', ignoring.", filename);
_file_count = 0;
_files = NULL;
return;
}
FileEntry *fe = CallocT<FileEntry>(count);
if (fe == NULL) {
@ -104,13 +113,9 @@ uint GetNumOriginalSounds()
return _file_count;
}
static bool SetBankSource(MixerChannel *mc, uint bank)
static bool SetBankSource(MixerChannel *mc, const FileEntry *fe)
{
const FileEntry *fe;
uint i;
if (bank >= GetNumSounds()) return false;
fe = GetSound(bank);
assert(fe != NULL);
if (fe->file_size == 0) return false;
@ -120,8 +125,9 @@ static bool SetBankSource(MixerChannel *mc, uint bank)
FioSeekToFile(fe->file_slot, fe->file_offset);
FioReadBlock(mem, fe->file_size);
for (i = 0; i != fe->file_size; i++)
for (uint i = 0; i != fe->file_size; i++) {
mem[i] += -128; // Convert unsigned sound data to signed
}
assert(fe->bits_per_sample == 8 && fe->channels == 1 && fe->file_size != 0 && fe->rate != 0);
@ -139,17 +145,22 @@ bool SoundInitialize(const char *filename)
/* Low level sound player */
static void StartSound(uint sound, int panning, uint volume)
{
MixerChannel *mc;
uint left_vol, right_vol;
if (volume == 0) return;
mc = MxAllocateChannel();
const FileEntry *fe = GetSound(sound);
if (fe == NULL) return;
MixerChannel *mc = MxAllocateChannel();
if (mc == NULL) return;
if (!SetBankSource(mc, sound)) return;
if (!SetBankSource(mc, fe)) return;
/* Apply the sound effect's own volume. */
volume = (fe->volume * volume) / 128;
panning = Clamp(panning, -PANNING_LEVELS, PANNING_LEVELS);
left_vol = (volume * PANNING_LEVELS) - (volume * panning);
right_vol = (volume * PANNING_LEVELS) + (volume * panning);
uint left_vol = (volume * PANNING_LEVELS) - (volume * panning);
uint right_vol = (volume * PANNING_LEVELS) + (volume * panning);
MxSetChannelVolume(mc, left_vol * 128 / PANNING_LEVELS, right_vol * 128 / PANNING_LEVELS);
MxActivateChannel(mc);
}
@ -215,7 +226,7 @@ static void SndPlayScreenCoordFx(SoundFx sound, int x, int y)
StartSound(
sound,
left / max(1, vp->virtual_width / ((PANNING_LEVELS << 1) + 1)) - PANNING_LEVELS,
(GetSound(sound)->volume * msf.effect_vol * _vol_factor_by_zoom[vp->zoom - ZOOM_LVL_BEGIN]) >> 15
(msf.effect_vol * _vol_factor_by_zoom[vp->zoom - ZOOM_LVL_BEGIN]) / 256
);
return;
}
@ -242,9 +253,5 @@ void SndPlayVehicleFx(SoundFx sound, const Vehicle *v)
void SndPlayFx(SoundFx sound)
{
StartSound(
sound,
0,
(GetSound(sound)->volume * msf.effect_vol) >> 7
);
StartSound(sound, 0, msf.effect_vol);
}