290 lines
6.8 KiB
C++
290 lines
6.8 KiB
C++
/*
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* This file is part of the DXX-Rebirth project <https://www.dxx-rebirth.com/>.
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* It is copyright by its individual contributors, as recorded in the
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* project's Git history. See COPYING.txt at the top level for license
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* terms and a link to the Git history.
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*/
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/*
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* This is an alternate backend for the sound effect system.
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* It uses SDL_mixer to provide a more reliable playback,
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* and allow processing of multiple audio formats.
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*
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* This file is based on the original D1X arch/sdl/digi.c
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*
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* -- MD2211 (2006-10-12)
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*/
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#include <bitset>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <SDL.h>
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#include <SDL_audio.h>
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#include <SDL_mixer.h>
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#include "pstypes.h"
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#include "dxxerror.h"
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#include "sounds.h"
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#include "digi.h"
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#include "digi_mixer.h"
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#include "digi_mixer_music.h"
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#include "console.h"
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#include "config.h"
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#include "args.h"
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#include "maths.h"
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#include "piggy.h"
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#include "u_mem.h"
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#include <memory>
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#define MIX_DIGI_DEBUG 0
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#define MIX_OUTPUT_FORMAT AUDIO_S16
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#define MIX_OUTPUT_CHANNELS 2
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#if !((defined(__APPLE__) && defined(__MACH__)) || defined(macintosh))
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#define SOUND_BUFFER_SIZE 2048
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#else
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#define SOUND_BUFFER_SIZE 1024
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#endif
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namespace dcx {
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namespace {
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/* channel management */
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static unsigned digi_mixer_find_channel(const std::bitset<64> &channels, const unsigned max_channels)
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{
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unsigned i = 0;
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for (; i < max_channels; ++i)
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if (!channels[i])
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break;
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return i;
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}
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struct RAIIMix_Chunk : public Mix_Chunk
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{
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RAIIMix_Chunk() = default;
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~RAIIMix_Chunk()
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{
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delete [] abuf;
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}
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RAIIMix_Chunk(const RAIIMix_Chunk &) = delete;
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RAIIMix_Chunk &operator=(const RAIIMix_Chunk &) = delete;
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};
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static int fix2byte(const fix f)
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{
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return (f / 256) % 256;
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}
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uint8_t digi_initialised;
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std::bitset<64> channels;
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unsigned digi_mixer_max_channels = channels.size();
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void digi_mixer_free_channel(const int channel_num)
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{
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channels.reset(channel_num);
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}
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}
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}
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namespace dsx {
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static std::array<RAIIMix_Chunk, MAX_SOUNDS> SoundChunks;
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/* Initialise audio */
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int digi_mixer_init()
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{
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#if defined(DXX_BUILD_DESCENT_II)
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const unsigned
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#endif
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digi_sample_rate = SAMPLE_RATE_44K;
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#if MIX_DIGI_DEBUG
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con_printf(CON_DEBUG, "digi_init %u (SDL_Mixer)", MAX_SOUNDS.value);
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#endif
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if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) Error("SDL audio initialisation failed: %s.", SDL_GetError());
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if (Mix_OpenAudio(digi_sample_rate, MIX_OUTPUT_FORMAT, MIX_OUTPUT_CHANNELS, SOUND_BUFFER_SIZE))
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{
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//edited on 10/05/98 by Matt Mueller - should keep running, just with no sound.
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con_printf(CON_URGENT,"\nError: Couldn't open audio: %s", SDL_GetError());
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CGameArg.SndNoSound = 1;
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return 1;
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}
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digi_mixer_max_channels = Mix_AllocateChannels(digi_mixer_max_channels);
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channels.reset();
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Mix_Pause(0);
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Mix_ChannelFinished(digi_mixer_free_channel);
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digi_initialised = 1;
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digi_mixer_set_digi_volume( (GameCfg.DigiVolume*32768)/8 );
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return 0;
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}
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}
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namespace dcx {
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/* Shut down audio */
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void digi_mixer_close() {
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#if MIX_DIGI_DEBUG
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con_printf(CON_DEBUG, "digi_close (SDL_Mixer)");
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#endif
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if (!digi_initialised) return;
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digi_initialised = 0;
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Mix_CloseAudio();
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}
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}
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namespace dsx {
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/*
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* Play-time conversion. Performs output conversion only once per sound effect used.
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* Once the sound sample has been converted, it is cached in SoundChunks[]
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*/
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static void mixdigi_convert_sound(const unsigned i)
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{
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if (SoundChunks[i].abuf)
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//proceed only if not converted yet
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return;
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SDL_AudioCVT cvt;
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Uint8 *data = GameSounds[i].data;
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Uint32 dlen = GameSounds[i].length;
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int freq;
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int out_freq;
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Uint16 out_format;
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int out_channels;
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#if defined(DXX_BUILD_DESCENT_I)
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out_freq = digi_sample_rate;
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out_format = MIX_OUTPUT_FORMAT;
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out_channels = MIX_OUTPUT_CHANNELS;
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freq = GameSounds[i].freq;
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#elif defined(DXX_BUILD_DESCENT_II)
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Mix_QuerySpec(&out_freq, &out_format, &out_channels); // get current output settings
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freq = GameArg.SndDigiSampleRate;
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#endif
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if (data)
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{
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if (SDL_BuildAudioCVT(&cvt, AUDIO_U8, 1, freq, out_format, out_channels, out_freq) == -1)
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{
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con_printf(CON_URGENT, "%s:%u: SDL_BuildAudioCVT failed: sound=%i dlen=%u freq=%i out_format=%i out_channels=%i out_freq=%i", __FILE__, __LINE__, i, dlen, freq, out_format, out_channels, out_freq);
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return;
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}
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auto cvtbuf = std::make_unique<Uint8[]>(dlen * cvt.len_mult);
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cvt.buf = cvtbuf.get();
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cvt.len = dlen;
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memcpy(cvt.buf, data, dlen);
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if (SDL_ConvertAudio(&cvt))
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{
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con_printf(CON_URGENT, "%s:%u: SDL_ConvertAudio failed: sound=%i dlen=%u freq=%i out_format=%i out_channels=%i out_freq=%i", __FILE__, __LINE__, i, dlen, freq, out_format, out_channels, out_freq);
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return;
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}
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SoundChunks[i].abuf = cvtbuf.release();
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SoundChunks[i].alen = cvt.len_cvt;
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SoundChunks[i].allocated = 1;
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SoundChunks[i].volume = 128; // Max volume = 128
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}
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}
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// Volume 0-F1_0
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int digi_mixer_start_sound(short soundnum, fix volume, int pan, int looping, int loop_start, int loop_end, sound_object *)
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{
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if (!digi_initialised) return -1;
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if (soundnum < 0)
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return -1;
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const unsigned max_channels = digi_mixer_max_channels;
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if (max_channels > channels.size())
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return -1;
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const auto channel = digi_mixer_find_channel(channels, max_channels);
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if (channel >= max_channels)
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return -1;
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Assert(GameSounds[soundnum].data != reinterpret_cast<void *>(-1));
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mixdigi_convert_sound(soundnum);
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const int mix_vol = fix2byte(fixmul(digi_volume, volume));
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const uint8_t mix_distance = (volume > F1_0) ? 0 : UINT8_MAX - mix_vol;
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const int mix_pan = fix2byte(pan);
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#if MIX_DIGI_DEBUG
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con_printf(CON_DEBUG, "digi_start_sound %d, volume %d, pan %d (start=%d, end=%d)", soundnum, mix_vol, mix_pan, loop_start, loop_end);
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#else
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(void)loop_start;
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(void)loop_end;
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#endif
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const int mix_loop = looping * -1;
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Mix_PlayChannel(channel, &(SoundChunks[soundnum]), mix_loop);
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Mix_SetPanning(channel, 255-mix_pan, mix_pan);
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Mix_SetDistance(channel, mix_distance);
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channels.set(channel);
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return channel;
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}
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}
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namespace dcx {
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void digi_mixer_set_channel_volume(int channel, int volume)
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{
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int mix_vol = fix2byte(volume);
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if (!digi_initialised) return;
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Mix_SetDistance(channel, 255-mix_vol);
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}
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void digi_mixer_set_channel_pan(int channel, int pan)
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{
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int mix_pan = fix2byte(pan);
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Mix_SetPanning(channel, 255-mix_pan, mix_pan);
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}
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void digi_mixer_stop_sound(int channel) {
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if (!digi_initialised) return;
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#if MIX_DIGI_DEBUG
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con_printf(CON_DEBUG, "digi_stop_sound %d", channel);
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#endif
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Mix_HaltChannel(channel);
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channels.reset(channel);
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}
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void digi_mixer_end_sound(int channel)
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{
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digi_mixer_stop_sound(channel);
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channels.reset(channel);
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}
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void digi_mixer_set_digi_volume( int dvolume )
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{
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digi_volume = dvolume;
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if (!digi_initialised) return;
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Mix_Volume(-1, fix2byte(dvolume));
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}
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int digi_mixer_is_channel_playing(const int c)
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{
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return channels[c];
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}
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void digi_mixer_reset() {}
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void digi_mixer_stop_all_channels()
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{
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channels = {};
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Mix_HaltChannel(-1);
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}
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}
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