Subversion Repositories test_project

/*

 * pcm emulation on emu8000 wavetable

 *

 *  Copyright (C) 2002 Takashi Iwai <tiwai@suse.de>

 *

 *   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 "emu8000_local.h"

#include <linux/init.h>

#include <sound/initval.h>

#include <sound/pcm.h>

/*

 * define the following if you want to use this pcm with non-interleaved mode

 */

/* #define USE_NONINTERLEAVE */

/* NOTE: for using the non-interleaved mode with alsa-lib, you have to set

 * mmap_emulation flag to 1 in your .asoundrc, such like

 *

 *      pcm.emu8k {

 *              type plug

 *              slave.pcm {

 *                      type hw

 *                      card 0

 *                      device 1

 *                      mmap_emulation 1

 *              }

 *      }

 *

 * besides, for the time being, the non-interleaved mode doesn't work well on

 * alsa-lib...

 */

struct snd_emu8k_pcm {

        struct snd_emu8000 *emu;

        struct snd_pcm_substream *substream;

        unsigned int allocated_bytes;

        struct snd_util_memblk *block;

        unsigned int offset;

        unsigned int buf_size;

        unsigned int period_size;

        unsigned int loop_start[2];

        unsigned int pitch;

        int panning[2];

        int last_ptr;

        int period_pos;

        int voices;

        unsigned int dram_opened: 1;

        unsigned int running: 1;

        unsigned int timer_running: 1;

        struct timer_list timer;

        spinlock_t timer_lock;

};

#define LOOP_BLANK_SIZE         8

/*

 * open up channels for the simultaneous data transfer and playback

 */

static int

emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels)

{

        int i;

        /* reserve up to 2 voices for playback */

        snd_emux_lock_voice(emu->emu, 0);

        if (channels > 1)

                snd_emux_lock_voice(emu->emu, 1);

        /* reserve 28 voices for loading */

        for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) {

                unsigned int mode = EMU8000_RAM_WRITE;

                snd_emux_lock_voice(emu->emu, i);

#ifndef USE_NONINTERLEAVE

                if (channels > 1 && (i & 1) != 0)

                        mode |= EMU8000_RAM_RIGHT;

#endif

                snd_emu8000_dma_chan(emu, i, mode);

        }

        /* assign voice 31 and 32 to ROM */

        EMU8000_VTFT_WRITE(emu, 30, 0);

        EMU8000_PSST_WRITE(emu, 30, 0x1d8);

        EMU8000_CSL_WRITE(emu, 30, 0x1e0);

        EMU8000_CCCA_WRITE(emu, 30, 0x1d8);

        EMU8000_VTFT_WRITE(emu, 31, 0);

        EMU8000_PSST_WRITE(emu, 31, 0x1d8);

        EMU8000_CSL_WRITE(emu, 31, 0x1e0);

        EMU8000_CCCA_WRITE(emu, 31, 0x1d8);

        return 0;

}

/*

 */

static void

snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule)

{

        while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {

                if (can_schedule) {

                        schedule_timeout_interruptible(1);

                        if (signal_pending(current))

                                break;

                }

        }

}

/*

 * close all channels

 */

static void

emu8k_close_dram(struct snd_emu8000 *emu)

{

        int i;

        for (i = 0; i < 2; i++)

                snd_emux_unlock_voice(emu->emu, i);

        for (; i < EMU8000_DRAM_VOICES; i++) {

                snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);

                snd_emux_unlock_voice(emu->emu, i);

        }

}

/*

 * convert Hz to AWE32 rate offset (see emux/soundfont.c)

 */

#define OFFSET_SAMPLERATE       1011119         /* base = 44100 */

#define SAMPLERATE_RATIO        4096

static int calc_rate_offset(int hz)

{

        return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);

}

/*

 */

static struct snd_pcm_hardware emu8k_pcm_hw = {

#ifdef USE_NONINTERLEAVE

        .info =                 SNDRV_PCM_INFO_NONINTERLEAVED,

#else

        .info =                 SNDRV_PCM_INFO_INTERLEAVED,

#endif

        .formats =              SNDRV_PCM_FMTBIT_S16_LE,

        .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,

        .rate_min =             4000,

        .rate_max =             48000,

        .channels_min =         1,

        .channels_max =         2,

        .buffer_bytes_max =     (128*1024),

        .period_bytes_min =     1024,

        .period_bytes_max =     (128*1024),

        .periods_min =          2,

        .periods_max =          1024,

        .fifo_size =            0,

};

/*

 * get the current position at the given channel from CCCA register

 */

static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)

{

        int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;

        val -= rec->loop_start[ch] - 1;

        return val;

}

/*

 * timer interrupt handler

 * check the current position and update the period if necessary.

 */

static void emu8k_pcm_timer_func(unsigned long data)

{

        struct snd_emu8k_pcm *rec = (struct snd_emu8k_pcm *)data;

        int ptr, delta;

        spin_lock(&rec->timer_lock);

        /* update the current pointer */

        ptr = emu8k_get_curpos(rec, 0);

        if (ptr < rec->last_ptr)

                delta = ptr + rec->buf_size - rec->last_ptr;

        else

                delta = ptr - rec->last_ptr;

        rec->period_pos += delta;

        rec->last_ptr = ptr;

        /* reprogram timer */

        rec->timer.expires = jiffies + 1;

        add_timer(&rec->timer);

        /* update period */

        if (rec->period_pos >= (int)rec->period_size) {

                rec->period_pos %= rec->period_size;

                spin_unlock(&rec->timer_lock);

                snd_pcm_period_elapsed(rec->substream);

                return;

        }

        spin_unlock(&rec->timer_lock);

}

/*

 * open pcm

 * creating an instance here

 */

static int emu8k_pcm_open(struct snd_pcm_substream *subs)

{

        struct snd_emu8000 *emu = snd_pcm_substream_chip(subs);

        struct snd_emu8k_pcm *rec;

        struct snd_pcm_runtime *runtime = subs->runtime;

        rec = kzalloc(sizeof(*rec), GFP_KERNEL);

        if (! rec)

                return -ENOMEM;

        rec->emu = emu;

        rec->substream = subs;

        runtime->private_data = rec;

        spin_lock_init(&rec->timer_lock);

        init_timer(&rec->timer);

        rec->timer.function = emu8k_pcm_timer_func;

        rec->timer.data = (unsigned long)rec;

        runtime->hw = emu8k_pcm_hw;

        runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;

        runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;

        /* use timer to update periods.. (specified in msec) */

        snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,

                                     (1000000 + HZ - 1) / HZ, UINT_MAX);

        return 0;

}

static int emu8k_pcm_close(struct snd_pcm_substream *subs)

{

        struct snd_emu8k_pcm *rec = subs->runtime->private_data;

        kfree(rec);

        subs->runtime->private_data = NULL;

        return 0;

}

/*

 * calculate pitch target

 */

static int calc_pitch_target(int pitch)

{

        int ptarget = 1 << (pitch >> 12);

        if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;

        if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;

        if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;

        ptarget += (ptarget >> 1);

        if (ptarget > 0xffff) ptarget = 0xffff;

        return ptarget;

}

/*

 * set up the voice

 */

static void setup_voice(struct snd_emu8k_pcm *rec, int ch)

{

        struct snd_emu8000 *hw = rec->emu;

        unsigned int temp;

        /* channel to be silent and idle */

        EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);

        EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);

        EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);

        EMU8000_PTRX_WRITE(hw, ch, 0);

        EMU8000_CPF_WRITE(hw, ch, 0);

        /* pitch offset */

        EMU8000_IP_WRITE(hw, ch, rec->pitch);

        /* set envelope parameters */

        EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);

        EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);

        EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);

        EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);

        EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);

        /* decay/sustain parameter for volume envelope is used

           for triggerg the voice */

        /* modulation envelope heights */

        EMU8000_PEFE_WRITE(hw, ch, 0x0);

        /* lfo1/2 delay */

        EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);

        EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);

        /* lfo1 pitch & cutoff shift */

        EMU8000_FMMOD_WRITE(hw, ch, 0);

        /* lfo1 volume & freq */

        EMU8000_TREMFRQ_WRITE(hw, ch, 0);

        /* lfo2 pitch & freq */

        EMU8000_FM2FRQ2_WRITE(hw, ch, 0);

        /* pan & loop start */

        temp = rec->panning[ch];

        temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);

        EMU8000_PSST_WRITE(hw, ch, temp);

        /* chorus & loop end (chorus 8bit, MSB) */

        temp = 0; // chorus

        temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);

        EMU8000_CSL_WRITE(hw, ch, temp);

        /* Q & current address (Q 4bit value, MSB) */

        temp = 0; // filterQ

        temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);

        EMU8000_CCCA_WRITE(hw, ch, temp);

        /* clear unknown registers */

        EMU8000_00A0_WRITE(hw, ch, 0);

        EMU8000_0080_WRITE(hw, ch, 0);

}

/*

 * trigger the voice

 */

static void start_voice(struct snd_emu8k_pcm *rec, int ch)

{

        unsigned long flags;

        struct snd_emu8000 *hw = rec->emu;

        unsigned int temp, aux;

        int pt = calc_pitch_target(rec->pitch);

        /* cutoff and volume */

        EMU8000_IFATN_WRITE(hw, ch, 0xff00);

        EMU8000_VTFT_WRITE(hw, ch, 0xffff);

        EMU8000_CVCF_WRITE(hw, ch, 0xffff);

        /* trigger envelope */

        EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);

        /* set reverb and pitch target */

        temp = 0; // reverb

        if (rec->panning[ch] == 0)

                aux = 0xff;

        else

                aux = (-rec->panning[ch]) & 0xff;

        temp = (temp << 8) | (pt << 16) | aux;

        EMU8000_PTRX_WRITE(hw, ch, temp);

        EMU8000_CPF_WRITE(hw, ch, pt << 16);

        /* start timer */

        spin_lock_irqsave(&rec->timer_lock, flags);

        if (! rec->timer_running) {

                rec->timer.expires = jiffies + 1;

                add_timer(&rec->timer);

                rec->timer_running = 1;

        }

        spin_unlock_irqrestore(&rec->timer_lock, flags);

}

/*

 * stop the voice immediately

 */

static void stop_voice(struct snd_emu8k_pcm *rec, int ch)

{

        unsigned long flags;

        struct snd_emu8000 *hw = rec->emu;

        EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);

        /* stop timer */

        spin_lock_irqsave(&rec->timer_lock, flags);

        if (rec->timer_running) {

                del_timer(&rec->timer);

                rec->timer_running = 0;

        }

        spin_unlock_irqrestore(&rec->timer_lock, flags);

}

static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd)

{

        struct snd_emu8k_pcm *rec = subs->runtime->private_data;

        int ch;

        switch (cmd) {

        case SNDRV_PCM_TRIGGER_START:

                for (ch = 0; ch < rec->voices; ch++)

                        start_voice(rec, ch);

                rec->running = 1;

                break;

        case SNDRV_PCM_TRIGGER_STOP:

                rec->running = 0;

                for (ch = 0; ch < rec->voices; ch++)

                        stop_voice(rec, ch);

                break;

        default:

                return -EINVAL;

        }

        return 0;

}

/*

 * copy / silence ops

 */

/*

 * this macro should be inserted in the copy/silence loops

 * to reduce the latency.  without this, the system will hang up

 * during the whole loop.

 */

#define CHECK_SCHEDULER() \

do { \

        cond_resched();\

        if (signal_pending(current))\

                return -EAGAIN;\

} while (0)

#ifdef USE_NONINTERLEAVE

/* copy one channel block */

static int emu8k_transfer_block(struct snd_emu8000 *emu, int offset, unsigned short *buf, int count)

{

        EMU8000_SMALW_WRITE(emu, offset);

        while (count > 0) {

                unsigned short sval;

                CHECK_SCHEDULER();

                get_user(sval, buf);

                EMU8000_SMLD_WRITE(emu, sval);

                buf++;

                count--;

        }

        return 0;

}

static int emu8k_pcm_copy(struct snd_pcm_substream *subs,

                          int voice,

                          snd_pcm_uframes_t pos,

                          void *src,

                          snd_pcm_uframes_t count)

{

        struct snd_emu8k_pcm *rec = subs->runtime->private_data;

        struct snd_emu8000 *emu = rec->emu;

        snd_emu8000_write_wait(emu, 1);

        if (voice == -1) {

                unsigned short *buf = src;

                int i, err;

                count /= rec->voices;

                for (i = 0; i < rec->voices; i++) {

                        err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count);

                        if (err < 0)

                                return err;

                        buf += count;

                }

                return 0;

        } else {

                return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count);

        }

}

/* make a channel block silence */

static int emu8k_silence_block(struct snd_emu8000 *emu, int offset, int count)

{

        EMU8000_SMALW_WRITE(emu, offset);

        while (count > 0) {

                CHECK_SCHEDULER();

                EMU8000_SMLD_WRITE(emu, 0);

                count--;

        }

        return 0;

}

static int emu8k_pcm_silence(struct snd_pcm_substream *subs,

                             int voice,

                             snd_pcm_uframes_t pos,

                             snd_pcm_uframes_t count)

{

        struct snd_emu8k_pcm *rec = subs->runtime->private_data;

        struct snd_emu8000 *emu = rec->emu;

        snd_emu8000_write_wait(emu, 1);

        if (voice == -1 && rec->voices == 1)

                voice = 0;

        if (voice == -1) {

                int err;

                err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2);

                if (err < 0)

                        return err;

                return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2);

        } else {

                return emu8k_silence_block(emu, pos + rec->loop_start[voice], count);

        }

}

#else /* interleave */

/*

 * copy the interleaved data can be done easily by using

 * DMA "left" and "right" channels on emu8k engine.

 */

static int emu8k_pcm_copy(struct snd_pcm_substream *subs,

                          int voice,

                          snd_pcm_uframes_t pos,

                          void __user *src,

                          snd_pcm_uframes_t count)

{

        struct snd_emu8k_pcm *rec = subs->runtime->private_data;

        struct snd_emu8000 *emu = rec->emu;

        unsigned short __user *buf = src;

        snd_emu8000_write_wait(emu, 1);

        EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]);

        if (rec->voices > 1)

                EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]);

        while (count-- > 0) {

                unsigned short sval;

                CHECK_SCHEDULER();

                get_user(sval, buf);

                EMU8000_SMLD_WRITE(emu, sval);

                buf++;

                if (rec->voices > 1) {

                        CHECK_SCHEDULER();

                        get_user(sval, buf);

                        EMU8000_SMRD_WRITE(emu, sval);

                        buf++;

                }

        }

        return 0;

}

static int emu8k_pcm_silence(struct snd_pcm_substream *subs,

                             int voice,

                             snd_pcm_uframes_t pos,

                             snd_pcm_uframes_t count)

{

        struct snd_emu8k_pcm *rec = subs->runtime->private_data;

        struct snd_emu8000 *emu = rec->emu;

        snd_emu8000_write_wait(emu, 1);

        EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos);

        if (rec->voices > 1)

                EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos);

        while (count-- > 0) {

                CHECK_SCHEDULER();

                EMU8000_SMLD_WRITE(emu, 0);

                if (rec->voices > 1) {

                        CHECK_SCHEDULER();

                        EMU8000_SMRD_WRITE(emu, 0);

                }

        }

        return 0;

}

#endif

/*

 * allocate a memory block

 */

static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs,

                               struct snd_pcm_hw_params *hw_params)

{

        struct snd_emu8k_pcm *rec = subs->runtime->private_data;

        if (rec->block) {

                /* reallocation - release the old block */

                snd_util_mem_free(rec->emu->memhdr, rec->block);

                rec->block = NULL;

        }

        rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;

        rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);

        if (! rec->block)

                return -ENOMEM;

        rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */

        /* at least dma_bytes must be set for non-interleaved mode */

        subs->dma_buffer.bytes = params_buffer_bytes(hw_params);

        return 0;

}

/*

 * free the memory block

 */

static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs)

{

        struct snd_emu8k_pcm *rec = subs->runtime->private_data;

        if (rec->block) {

                int ch;

                for (ch = 0; ch < rec->voices; ch++)

                        stop_voice(rec, ch); // to be sure

                if (rec->dram_opened)

                        emu8k_close_dram(rec->emu);

                snd_util_mem_free(rec->emu->memhdr, rec->block);

                rec->block = NULL;

        }

        return 0;

}

/*

 */

static int emu8k_pcm_prepare(struct snd_pcm_substream *subs)

{

        struct snd_emu8k_pcm *rec = subs->runtime->private_data;

        rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);

        rec->last_ptr = 0;

        rec->period_pos = 0;

        rec->buf_size = subs->runtime->buffer_size;

        rec->period_size = subs->runtime->period_size;

        rec->voices = subs->runtime->channels;

        rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;

        if (rec->voices > 1)

                rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;

        if (rec->voices > 1) {

                rec->panning[0] = 0xff;

                rec->panning[1] = 0x00;

        } else

                rec->panning[0] = 0x80;

        if (! rec->dram_opened) {

                int err, i, ch;

                snd_emux_terminate_all(rec->emu->emu);

                if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0)

                        return err;

                rec->dram_opened = 1;

                /* clear loop blanks */

                snd_emu8000_write_wait(rec->emu, 0);

                EMU8000_SMALW_WRITE(rec->emu, rec->offset);

                for (i = 0; i < LOOP_BLANK_SIZE; i++)

                        EMU8000_SMLD_WRITE(rec->emu, 0);

                for (ch = 0; ch < rec->voices; ch++) {

                        EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);

                        for (i = 0; i < LOOP_BLANK_SIZE; i++)

                                EMU8000_SMLD_WRITE(rec->emu, 0);