- if (IS_RELOADING(snd_ctrl)) /* load new sound or music files */
- {
- Mixer_StopMusicChannel();
- for (i = audio.first_sound_channel; i < audio.num_channels; i++)
- Mixer_StopChannel(i);
-
-#if defined(AUDIO_UNIX_NATIVE)
- CloseAudioDevice(&audio.device_fd);
- ReadReloadInfoFromPipe(&snd_ctrl);
-#endif
-
- if (snd_ctrl.state & SND_CTRL_RELOAD_SOUNDS)
- ReloadCustomSounds();
- else
- ReloadCustomMusic();
- }
- else if (IS_FADING(snd_ctrl)) /* fade out existing sound or music */
- {
- if (IS_MUSIC(snd_ctrl))
- {
- Mixer_FadeMusicChannel();
- return;
- }
-
- for (i = audio.first_sound_channel; i < audio.num_channels; i++)
- if (SAME_SOUND_NR(mixer[i], snd_ctrl) || ALL_SOUNDS(snd_ctrl))
- Mixer_FadeChannel(i);
- }
- else if (IS_STOPPING(snd_ctrl)) /* stop existing sound or music */
- {
- if (IS_MUSIC(snd_ctrl))
- {
- Mixer_StopMusicChannel();
- return;
- }
-
- for (i = audio.first_sound_channel; i < audio.num_channels; i++)
- if (SAME_SOUND_NR(mixer[i], snd_ctrl) || ALL_SOUNDS(snd_ctrl))
- Mixer_StopChannel(i);
-
-#if defined(AUDIO_UNIX_NATIVE)
- if (!mixer_active_channels)
- CloseAudioDevice(&audio.device_fd);
-#endif
- }
- else if (snd_ctrl.active) /* add new sound to mixer */
- {
- Mixer_InsertSound(snd_ctrl);
- }
-}
-
-void StartMixer(void)
-{
- int i;
-
-#if 0
- SDL_version compile_version;
- const SDL_version *link_version;
- MIX_VERSION(&compile_version);
- printf("compiled with SDL_mixer version: %d.%d.%d\n",
- compile_version.major,
- compile_version.minor,
- compile_version.patch);
- link_version = Mix_Linked_Version();
- printf("running with SDL_mixer version: %d.%d.%d\n",
- link_version->major,
- link_version->minor,
- link_version->patch);
-#endif
-
- if (!audio.sound_available)
- return;
-
- /* initialize stereo position conversion information */
- for (i = 0; i <= SOUND_MAX_LEFT2RIGHT; i++)
- stereo_volume[i] =
- (int)sqrt((float)(SOUND_MAX_LEFT2RIGHT * SOUND_MAX_LEFT2RIGHT - i * i));
-
-#if defined(AUDIO_UNIX_NATIVE)
- if (!ForkAudioProcess())
- audio.sound_available = FALSE;
-#endif
-}
-
-#if defined(AUDIO_UNIX_NATIVE)
-
-static void CopySampleToMixingBuffer(SoundControl *snd_ctrl,
- int sample_pos, int sample_size,
- short *buffer_base_ptr, int buffer_pos,
- int num_output_channels)
-{
- short *buffer_ptr = buffer_base_ptr + num_output_channels * buffer_pos;
- int num_channels = snd_ctrl->num_channels;
- int stepsize = num_channels;
- int output_stepsize = num_output_channels;
- int i, j;
-
- if (snd_ctrl->format == AUDIO_FORMAT_U8)
- {
- byte *sample_ptr = (byte *)snd_ctrl->data_ptr + num_channels * sample_pos;
-
- for (i = 0; i < num_output_channels; i++)
- {
- int offset = (snd_ctrl->num_channels == 1 ? 0 : i);
-
- for (j = 0; j < sample_size; j++)
- buffer_ptr[output_stepsize * j + i] =
- ((short)(sample_ptr[stepsize * j + offset] ^ 0x80)) << 8;
- }
- }
- else /* AUDIO_FORMAT_S16 */
- {
- short *sample_ptr= (short *)snd_ctrl->data_ptr + num_channels * sample_pos;
-
- for (i = 0; i < num_output_channels; i++)
- {
- int offset = (snd_ctrl->num_channels == 1 ? 0 : i);
-
- for (j = 0; j < sample_size; j++)
- buffer_ptr[output_stepsize * j + i] =
- sample_ptr[stepsize * j + offset];
- }
- }
-}
-
-#if defined(AUDIO_STREAMING_DSP)
-static void Mixer_Main_DSP()
-{
- static short premix_first_buffer[DEFAULT_AUDIO_FRAGMENT_SIZE];
- static int premix_last_buffer[DEFAULT_AUDIO_FRAGMENT_SIZE];
- static byte playing_buffer[DEFAULT_AUDIO_FRAGMENT_SIZE];
- boolean stereo;
- int fragment_size;
- int sample_bytes;
- int max_sample_size;
- int num_output_channels;
- int i, j;
-
- if (!mixer_active_channels)
- return;
-
- if (audio.device_fd < 0)
- {
- if ((audio.device_fd = OpenAudioDevice(audio.device_name)) < 0)
- return;
-
- InitAudioDevice(&afmt);
- }
-
- stereo = afmt.stereo;
- fragment_size = afmt.fragment_size;
- sample_bytes = (afmt.format & AUDIO_FORMAT_U8 ? 1 : 2);
- num_output_channels = (stereo ? 2 : 1);
- max_sample_size = fragment_size / (num_output_channels * sample_bytes);
-
- /* first clear the last premixing buffer */
- clear_mem(premix_last_buffer,
- max_sample_size * num_output_channels * sizeof(int));
-
- for (i = 0; i < audio.num_channels; i++)
- {
- // void *sample_ptr;
- int sample_len;
- int sample_pos;
- int sample_size;
-
- if (!mixer[i].active)
- continue;
-
- if (Mixer_ChannelExpired(i))
- {
- Mixer_StopChannel(i);
- continue;
- }
-
- /* pointer, lenght and actual playing position of sound sample */
- // sample_ptr = mixer[i].data_ptr;
- sample_len = mixer[i].data_len;
- sample_pos = mixer[i].playing_pos;
- sample_size = MIN(max_sample_size, sample_len - sample_pos);
- mixer[i].playing_pos += sample_size;
-
- /* copy original sample to first mixing buffer */
- CopySampleToMixingBuffer(&mixer[i], sample_pos, sample_size,
- premix_first_buffer, 0, num_output_channels);
-
- /* are we about to restart a looping sound? */
- if (IS_LOOP(mixer[i]) && sample_size < max_sample_size)
- {
- while (sample_size < max_sample_size)
- {
- int restarted_sample_size =
- MIN(max_sample_size - sample_size, sample_len);
-
- CopySampleToMixingBuffer(&mixer[i], 0, restarted_sample_size,
- premix_first_buffer, sample_size,
- num_output_channels);
-
- mixer[i].playing_pos = restarted_sample_size;
- sample_size += restarted_sample_size;
- }
- }
-
- /* decrease volume if sound is fading out */
- if (IS_FADING(mixer[i]) &&
- mixer[i].volume >= SOUND_FADING_VOLUME_THRESHOLD)
- mixer[i].volume -= SOUND_FADING_VOLUME_STEP;
-
- /* adjust volume of actual sound sample */
- if (mixer[i].volume != SOUND_MAX_VOLUME)
- for (j = 0; j < sample_size * num_output_channels; j++)
- premix_first_buffer[j] =
- mixer[i].volume * (int)premix_first_buffer[j] / SOUND_MAX_VOLUME;
-
- /* adjust left and right channel volume due to stereo sound position */
- if (stereo)
- {
- int left_volume = SOUND_VOLUME_LEFT(mixer[i].stereo_position);
- int right_volume = SOUND_VOLUME_RIGHT(mixer[i].stereo_position);
-
- for (j = 0; j < sample_size; j++)
- {
- premix_first_buffer[2 * j + 0] =
- left_volume * premix_first_buffer[2 * j + 0] / SOUND_MAX_LEFT2RIGHT;
- premix_first_buffer[2 * j + 1] =
- right_volume * premix_first_buffer[2 * j + 1] / SOUND_MAX_LEFT2RIGHT;
- }
- }
-
- /* fill the last mixing buffer with stereo or mono sound */
- for (j = 0; j < sample_size * num_output_channels; j++)
- premix_last_buffer[j] += premix_first_buffer[j];
-
- /* delete completed sound entries from the mixer */
- if (mixer[i].playing_pos >= mixer[i].data_len)
- {
- if (IS_LOOP(mixer[i]))
- mixer[i].playing_pos = 0;
- else
- Mixer_StopChannel(i);
- }
- else if (mixer[i].volume <= SOUND_FADING_VOLUME_THRESHOLD)
- Mixer_StopChannel(i);
- }
-
- /* prepare final playing buffer according to system audio format */
- for (i = 0; i < max_sample_size * num_output_channels; i++)
- {
- /* cut off at 17 bit value */
- if (premix_last_buffer[i] < -65535)
- premix_last_buffer[i] = -65535;
- else if (premix_last_buffer[i] > 65535)
- premix_last_buffer[i] = 65535;
-
- /* shift to 16 bit value */
- premix_last_buffer[i] >>= 1;
-
- if (afmt.format & AUDIO_FORMAT_U8)
- {
- playing_buffer[i] = (premix_last_buffer[i] >> 8) ^ 0x80;
- }
- else if (afmt.format & AUDIO_FORMAT_LE) /* 16 bit */
- {
- playing_buffer[2 * i + 0] = premix_last_buffer[i] & 0xff;
- playing_buffer[2 * i + 1] = premix_last_buffer[i] >> 8;
- }
- else /* big endian */
- {
- playing_buffer[2 * i + 0] = premix_last_buffer[i] >> 8;
- playing_buffer[2 * i + 1] = premix_last_buffer[i] & 0xff;
- }
- }
-
- /* finally play the sound fragment */
- if (write(audio.device_fd, playing_buffer, fragment_size) == -1)
- Error(ERR_WARN, "write() failed; %s", strerror(errno));
-
- if (!mixer_active_channels)
- CloseAudioDevice(&audio.device_fd);
-}
-
-#else /* !AUDIO_STREAMING_DSP */
-
-static int Mixer_Main_SimpleAudio(SoundControl snd_ctrl)
-{
- static short premix_first_buffer[DEFAULT_AUDIO_FRAGMENT_SIZE];
- static byte playing_buffer[DEFAULT_AUDIO_FRAGMENT_SIZE];
- int max_sample_size = DEFAULT_AUDIO_FRAGMENT_SIZE;
- int num_output_channels = 1;
- void *sample_ptr;
- int sample_len;
- int sample_pos;
- int sample_size;
- int i, j;
-
- i = 1;
-
- /* pointer, lenght and actual playing position of sound sample */
- sample_ptr = mixer[i].data_ptr;
- sample_len = mixer[i].data_len;
- sample_pos = mixer[i].playing_pos;
- sample_size = MIN(max_sample_size, sample_len - sample_pos);
- mixer[i].playing_pos += sample_size;
-
- /* copy original sample to first mixing buffer */
- CopySampleToMixingBuffer(&mixer[i], sample_pos, sample_size,
- premix_first_buffer, 0, num_output_channels);
-
- /* adjust volume of actual sound sample */
- if (mixer[i].volume != SOUND_MAX_VOLUME)
- for (j = 0; j < sample_size; j++)
- premix_first_buffer[j] =
- mixer[i].volume * (int)premix_first_buffer[j] / SOUND_MAX_VOLUME;
-
- /* might be needed for u-law /dev/audio */
- for (j = 0; j < sample_size; j++)
- playing_buffer[j] =
- linear_to_ulaw(premix_first_buffer[j]);
-
- /* delete completed sound entries from the mixer */
- if (mixer[i].playing_pos >= mixer[i].data_len)
- Mixer_StopChannel(i);
-
- for (i = 0; i < sample_size; i++)
- playing_buffer[i] = (premix_first_buffer[i] >> 8) ^ 0x80;
-
- /* finally play the sound fragment */
- write(audio.device_fd, playing_buffer, sample_size);
-
- return sample_size;
-}
-#endif /* !AUDIO_STREAMING_DSP */
-
-void Mixer_Main()
-{
- SoundControl snd_ctrl;
- fd_set mixer_fdset;
-
- close(audio.mixer_pipe[1]); /* no writing into pipe needed */
-
- Mixer_InitChannels();
-
-#if defined(PLATFORM_HPUX)
- InitAudioDevice(&afmt);
-#endif
-
- FD_ZERO(&mixer_fdset);
- FD_SET(audio.mixer_pipe[0], &mixer_fdset);
-
- while (1) /* wait for sound playing commands from client */
- {
- struct timeval delay = { 0, 0 };
-
- FD_SET(audio.mixer_pipe[0], &mixer_fdset);
- select(audio.mixer_pipe[0] + 1, &mixer_fdset, NULL, NULL, NULL);
- if (!FD_ISSET(audio.mixer_pipe[0], &mixer_fdset))
- continue;
-
- ReadSoundControlFromMainProcess(&snd_ctrl);
-
- HandleSoundRequest(snd_ctrl);
-
-#if defined(AUDIO_STREAMING_DSP)