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- /*
- * audio_amiga.cpp - Audio support, AmigaOS implementation using AHI
- *
- * Basilisk II (C) 1997-2001 Christian Bauer
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
- #include "sysdeps.h"
-
- #include <exec/types.h>
- #include <exec/memory.h>
- #include <devices/ahi.h>
- #include <proto/exec.h>
- #include <proto/ahi.h>
-
- #include "cpu_emulation.h"
- #include "main.h"
- #include "prefs.h"
- #include "user_strings.h"
- #include "audio.h"
- #include "audio_defs.h"
-
- #define DEBUG 0
- #include "debug.h"
-
-
- // Supported sample rates, sizes and channels
- int audio_num_sample_rates = 1;
- uint32 audio_sample_rates[] = {22050 << 16};
- int audio_num_sample_sizes = 1;
- uint16 audio_sample_sizes[] = {16};
- int audio_num_channel_counts = 1;
- uint16 audio_channel_counts[] = {2};
-
-
- // Global variables
- static ULONG ahi_id = AHI_DEFAULT_ID; // AHI audio ID
- static struct AHIAudioCtrl *ahi_ctrl = NULL;
- static struct AHISampleInfo sample[2]; // Two sample infos for double-buffering
- static struct Hook sf_hook;
- static int play_buf = 0; // Number of currently played buffer
- static long sound_buffer_size; // Size of one audio buffer in bytes
- static int audio_block_fetched = 0; // Number of audio blocks fetched by interrupt routine
-
-
- // Prototypes
- static __saveds __attribute__((regparm(3))) ULONG audio_callback(struct Hook *hook /*a0*/, struct AHISoundMessage *msg /*a1*/, struct AHIAudioCtrl *ahi_ctrl /*a2*/);
-
-
- /*
- * Initialization
- */
-
- void AudioInit(void)
- {
- sample[0].ahisi_Address = sample[1].ahisi_Address = NULL;
-
- // Init audio status and feature flags
- AudioStatus.sample_rate = audio_sample_rates[0];
- AudioStatus.sample_size = audio_sample_sizes[0];
- AudioStatus.channels = audio_channel_counts[0];
- AudioStatus.mixer = 0;
- AudioStatus.num_sources = 0;
- audio_component_flags = cmpWantsRegisterMessage | kStereoOut | k16BitOut;
-
- // Sound disabled in prefs? Then do nothing
- if (PrefsFindBool("nosound"))
- return;
-
- // AHI available?
- if (AHIBase == NULL) {
- WarningAlert(GetString(STR_NO_AHI_WARN));
- return;
- }
-
- // Initialize callback hook
- sf_hook.h_Entry = (HOOKFUNC)audio_callback;
-
- // Read "sound" preferences
- const char *str = PrefsFindString("sound");
- if (str)
- sscanf(str, "ahi/%08lx", &ahi_id);
-
- // Open audio control structure
- if ((ahi_ctrl = AHI_AllocAudio(
- AHIA_AudioID, ahi_id,
- AHIA_MixFreq, AudioStatus.sample_rate >> 16,
- AHIA_Channels, 1,
- AHIA_Sounds, 2,
- AHIA_SoundFunc, (ULONG)&sf_hook,
- TAG_END)) == NULL) {
- WarningAlert(GetString(STR_NO_AHI_CTRL_WARN));
- return;
- }
-
- // 2048 frames per block
- audio_frames_per_block = 2048;
- sound_buffer_size = (AudioStatus.sample_size >> 3) * AudioStatus.channels * audio_frames_per_block;
-
- // Prepare SampleInfos and load sounds (two sounds for double buffering)
- sample[0].ahisi_Type = AudioStatus.sample_size == 16 ? AHIST_S16S : AHIST_S8S;
- sample[0].ahisi_Length = audio_frames_per_block;
- sample[0].ahisi_Address = AllocVec(sound_buffer_size, MEMF_PUBLIC | MEMF_CLEAR);
- sample[1].ahisi_Type = AudioStatus.sample_size == 16 ? AHIST_S16S : AHIST_S8S;
- sample[1].ahisi_Length = audio_frames_per_block;
- sample[1].ahisi_Address = AllocVec(sound_buffer_size, MEMF_PUBLIC | MEMF_CLEAR);
- if (sample[0].ahisi_Address == NULL || sample[1].ahisi_Address == NULL)
- return;
- AHI_LoadSound(0, AHIST_DYNAMICSAMPLE, &sample[0], ahi_ctrl);
- AHI_LoadSound(1, AHIST_DYNAMICSAMPLE, &sample[1], ahi_ctrl);
-
- // Set parameters
- play_buf = 0;
- AHI_SetVol(0, 0x10000, 0x8000, ahi_ctrl, AHISF_IMM);
- AHI_SetFreq(0, AudioStatus.sample_rate >> 16, ahi_ctrl, AHISF_IMM);
- AHI_SetSound(0, play_buf, 0, 0, ahi_ctrl, AHISF_IMM);
-
- // Everything OK
- audio_open = true;
- }
-
-
- /*
- * Deinitialization
- */
-
- void AudioExit(void)
- {
- // Free everything
- if (ahi_ctrl != NULL) {
- AHI_ControlAudio(ahi_ctrl, AHIC_Play, FALSE, TAG_END);
- AHI_FreeAudio(ahi_ctrl);
- }
-
- FreeVec(sample[0].ahisi_Address);
- FreeVec(sample[1].ahisi_Address);
- }
-
-
- /*
- * First source added, start audio stream
- */
-
- void audio_enter_stream()
- {
- AHI_ControlAudio(ahi_ctrl, AHIC_Play, TRUE, TAG_END);
- }
-
-
- /*
- * Last source removed, stop audio stream
- */
-
- void audio_exit_stream()
- {
- AHI_ControlAudio(ahi_ctrl, AHIC_Play, FALSE, TAG_END);
- }
-
-
- /*
- * AHI sound callback, request next buffer
- */
-
- static __saveds __attribute__((regparm(3))) ULONG audio_callback(struct Hook *hook /*a0*/, struct AHISoundMessage *msg /*a1*/, struct AHIAudioCtrl *ahi_ctrl /*a2*/)
- {
- play_buf ^= 1;
-
- // New buffer available?
- if (audio_block_fetched) {
- audio_block_fetched--;
-
- // Get size of audio data
- uint32 apple_stream_info = ReadMacInt32(audio_data + adatStreamInfo);
- if (apple_stream_info) {
- int work_size = ReadMacInt32(apple_stream_info + scd_sampleCount) * (AudioStatus.sample_size >> 3) * AudioStatus.channels;
- D(bug("stream: work_size %d\n", work_size));
- if (work_size > sound_buffer_size)
- work_size = sound_buffer_size;
-
- // Put data into AHI buffer (convert 8-bit data unsigned->signed)
- if (AudioStatus.sample_size == 16)
- Mac2Host_memcpy(sample[play_buf].ahisi_Address, ReadMacInt32(apple_stream_info + scd_buffer), work_size);
- else {
- uint32 *p = (uint32 *)Mac2HostAddr(ReadMacInt32(apple_stream_info + scd_buffer));
- uint32 *q = (uint32 *)sample[play_buf].ahisi_Address;
- int r = work_size >> 2;
- while (r--)
- *q++ = *p++ ^ 0x80808080;
- }
- if (work_size != sound_buffer_size)
- memset((uint8 *)sample[play_buf].ahisi_Address + work_size, 0, sound_buffer_size - work_size);
- }
-
- } else
- memset(sample[play_buf].ahisi_Address, 0, sound_buffer_size);
-
- // Play next buffer
- AHI_SetSound(0, play_buf, 0, 0, ahi_ctrl, 0);
-
- // Trigger audio interrupt to get new buffer
- if (AudioStatus.num_sources) {
- D(bug("stream: triggering irq\n"));
- SetInterruptFlag(INTFLAG_AUDIO);
- TriggerInterrupt();
- }
- return 0;
- }
-
-
- /*
- * MacOS audio interrupt, read next data block
- */
-
- void AudioInterrupt(void)
- {
- D(bug("AudioInterrupt\n"));
-
- // Get data from apple mixer
- if (AudioStatus.mixer) {
- M68kRegisters r;
- r.a[0] = audio_data + adatStreamInfo;
- r.a[1] = AudioStatus.mixer;
- Execute68k(audio_data + adatGetSourceData, &r);
- D(bug(" GetSourceData() returns %08lx\n", r.d[0]));
- } else
- WriteMacInt32(audio_data + adatStreamInfo, 0);
-
- // Signal stream function
- audio_block_fetched++;
- D(bug("AudioInterrupt done\n"));
- }
-
-
- /*
- * Set sampling parameters
- * "index" is an index into the audio_sample_rates[] etc. arrays
- * It is guaranteed that AudioStatus.num_sources == 0
- */
-
- void audio_set_sample_rate(int index)
- {
- }
-
- void audio_set_sample_size(int index)
- {
- }
-
- void audio_set_channels(int index)
- {
- }
-
-
- /*
- * Get/set volume controls (volume values received/returned have the left channel
- * volume in the upper 16 bits and the right channel volume in the lower 16 bits;
- * both volumes are 8.8 fixed point values with 0x0100 meaning "maximum volume"))
- */
-
- bool audio_get_main_mute(void)
- {
- return false;
- }
-
- uint32 audio_get_main_volume(void)
- {
- return 0x01000100;
- }
-
- bool audio_get_speaker_mute(void)
- {
- return false;
- }
-
- uint32 audio_get_speaker_volume(void)
- {
- return 0x01000100;
- }
-
- void audio_set_main_mute(bool mute)
- {
- }
-
- void audio_set_main_volume(uint32 vol)
- {
- }
-
- void audio_set_speaker_mute(bool mute)
- {
- }
-
- void audio_set_speaker_volume(uint32 vol)
- {
- }
-