author | rubidium |
Thu, 01 Feb 2007 15:49:12 +0000 | |
changeset 5893 | 7e431a4abebb |
parent 5587 | 167d9a91ef02 |
child 6201 | bee01dc45e39 |
permissions | -rw-r--r-- |
2186 | 1 |
/* $Id$ */ |
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||
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#include "stdafx.h" |
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#include "openttd.h" |
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#include "mixer.h" |
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struct MixerChannel { |
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bool active; |
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|
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// pointer to allocated buffer memory |
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int8 *memory; |
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|
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// current position in memory |
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uint32 pos; |
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uint32 frac_pos; |
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uint32 frac_speed; |
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uint32 samples_left; |
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|
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// Mixing volume |
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uint volume_left; |
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uint volume_right; |
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|
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uint flags; |
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}; |
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static MixerChannel _channels[8]; |
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static uint32 _play_rate; |
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static void mix_int8_to_int16(MixerChannel *sc, int16 *buffer, uint samples) |
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{ |
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int8 *b; |
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uint32 frac_pos; |
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uint32 frac_speed; |
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uint volume_left; |
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uint volume_right; |
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|
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if (samples > sc->samples_left) samples = sc->samples_left; |
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sc->samples_left -= samples; |
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assert(samples > 0); |
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b = sc->memory + sc->pos; |
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frac_pos = sc->frac_pos; |
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frac_speed = sc->frac_speed; |
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volume_left = sc->volume_left; |
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volume_right = sc->volume_right; |
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|
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if (frac_speed == 0x10000) { |
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// Special case when frac_speed is 0x10000 |
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do { |
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buffer[0] += *b * volume_left >> 8; |
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buffer[1] += *b * volume_right >> 8; |
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b++; |
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buffer += 2; |
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} while (--samples > 0); |
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} else { |
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do { |
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buffer[0] += *b * volume_left >> 8; |
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buffer[1] += *b * volume_right >> 8; |
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buffer += 2; |
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frac_pos += frac_speed; |
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b += frac_pos >> 16; |
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frac_pos &= 0xffff; |
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} while (--samples > 0); |
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} |
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sc->frac_pos = frac_pos; |
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sc->pos = b - sc->memory; |
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} |
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static void MxCloseChannel(MixerChannel *mc) |
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{ |
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if (mc->flags & MX_AUTOFREE) free(mc->memory); |
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mc->active = false; |
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mc->memory = NULL; |
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} |
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void MxMixSamples(void *buffer, uint samples) |
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{ |
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MixerChannel *mc; |
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// Clear the buffer |
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memset(buffer, 0, sizeof(int16) * 2 * samples); |
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// Mix each channel |
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for (mc = _channels; mc != endof(_channels); mc++) { |
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if (mc->active) { |
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mix_int8_to_int16(mc, (int16*)buffer, samples); |
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if (mc->samples_left == 0) MxCloseChannel(mc); |
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} |
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} |
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} |
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MixerChannel *MxAllocateChannel(void) |
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{ |
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MixerChannel *mc; |
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for (mc = _channels; mc != endof(_channels); mc++) |
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if (mc->memory == NULL) { |
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mc->active = false; |
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return mc; |
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} |
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return NULL; |
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} |
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void MxSetChannelRawSrc(MixerChannel *mc, int8 *mem, uint size, uint rate, uint flags) |
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{ |
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mc->memory = mem; |
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mc->flags = flags; |
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mc->frac_pos = 0; |
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mc->pos = 0; |
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mc->frac_speed = (rate << 16) / _play_rate; |
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// adjust the magnitude to prevent overflow |
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while (size & 0xFFFF0000) { |
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size >>= 1; |
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rate = (rate >> 1) + 1; |
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} |
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mc->samples_left = size * _play_rate / rate; |
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} |
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void MxSetChannelVolume(MixerChannel *mc, uint left, uint right) |
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{ |
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mc->volume_left = left; |
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mc->volume_right = right; |
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} |
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void MxActivateChannel(MixerChannel* mc) |
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{ |
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mc->active = true; |
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} |
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bool MxInitialize(uint rate) |
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{ |
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_play_rate = rate; |
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return true; |
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} |