feeder_format.c

Go to the documentation of this file.

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2008-2009 Ariff Abdullah <ariff@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
 
/*
 * feeder_format: New generation of generic, any-to-any format converter, as
 *                long as the sample values can be read _and_ write.
 */
 
#ifdef _KERNEL
#ifdef HAVE_KERNEL_OPTION_HEADERS
#include "opt_snd.h"
#endif
#include <dev/sound/pcm/sound.h>
#include <dev/sound/pcm/pcm.h>
#include <dev/sound/pcm/g711.h>
#include <dev/sound/pcm/intpcm.h>
#include "feeder_if.h"
 
#define SND_USE_FXDIV
#include "snd_fxdiv_gen.h"
 
SND_DECLARE_FILE("$FreeBSD$");
#endif
 
#define FEEDFORMAT_RESERVOIR    (SND_CHN_MAX * PCM_32_BPS)
 
INTPCM_DECLARE(intpcm_conv_tables)
 
struct feed_format_info {
        uint32_t ibps, obps;
        uint32_t ialign, oalign, channels;
        intpcm_read_t *read;
        intpcm_write_t *write;
        uint8_t reservoir[FEEDFORMAT_RESERVOIR];
};
 
/*
 * dummy ac3/dts passthrough, etc.
 * XXX assume as s16le.
 */
static __inline intpcm_t
intpcm_read_null(uint8_t *src __unused)
{
 
        return (0);
}
 
static __inline void
intpcm_write_null(uint8_t *dst, intpcm_t v __unused)
{
 
        _PCM_WRITE_S16_LE(dst, 0);
}
 
#define FEEDFORMAT_ENTRY(SIGN, BIT, ENDIAN)                             \
        {                                                               \
                AFMT_##SIGN##BIT##_##ENDIAN,                            \
                intpcm_read_##SIGN##BIT##ENDIAN,                        \
                intpcm_write_##SIGN##BIT##ENDIAN                        \
        }
 
static const struct {
        uint32_t format;
        intpcm_read_t *read;
        intpcm_write_t *write;
} feed_format_ops[] = {
        FEEDFORMAT_ENTRY(S,  8, NE),
        FEEDFORMAT_ENTRY(S, 16, LE),
        FEEDFORMAT_ENTRY(S, 24, LE),
        FEEDFORMAT_ENTRY(S, 32, LE),
        FEEDFORMAT_ENTRY(S, 16, BE),
        FEEDFORMAT_ENTRY(S, 24, BE),
        FEEDFORMAT_ENTRY(S, 32, BE),
        FEEDFORMAT_ENTRY(U,  8, NE),
        FEEDFORMAT_ENTRY(U, 16, LE),
        FEEDFORMAT_ENTRY(U, 24, LE),
        FEEDFORMAT_ENTRY(U, 32, LE),
        FEEDFORMAT_ENTRY(U, 16, BE),
        FEEDFORMAT_ENTRY(U, 24, BE),
        FEEDFORMAT_ENTRY(U, 32, BE),
        {
                AFMT_MU_LAW,
                intpcm_read_ulaw, intpcm_write_ulaw
        },
        {
                AFMT_A_LAW,
                intpcm_read_alaw, intpcm_write_alaw
        },
        {
                AFMT_AC3,
                intpcm_read_null, intpcm_write_null
        }
};
 
#define FEEDFORMAT_TAB_SIZE                                             \
        ((int32_t)(sizeof(feed_format_ops) / sizeof(feed_format_ops[0])))
 
static int
feed_format_init(struct pcm_feeder *f)
{
        struct feed_format_info *info;
        intpcm_read_t *rd_op;
        intpcm_write_t *wr_op;
        int i;
 
        if (f->desc->in == f->desc->out ||
            AFMT_CHANNEL(f->desc->in) != AFMT_CHANNEL(f->desc->out))
                return (EINVAL);
 
        rd_op = NULL;
        wr_op = NULL;
 
        for (i = 0; i < FEEDFORMAT_TAB_SIZE &&
            (rd_op == NULL || wr_op == NULL); i++) {
                if (rd_op == NULL &&
                    AFMT_ENCODING(f->desc->in) == feed_format_ops[i].format)
                        rd_op = feed_format_ops[i].read;
                if (wr_op == NULL &&
                    AFMT_ENCODING(f->desc->out) == feed_format_ops[i].format)
                        wr_op = feed_format_ops[i].write;
        }
 
        if (rd_op == NULL || wr_op == NULL) {
                printf("%s(): failed to initialize io ops "
                    "in=0x%08x out=0x%08x\n",
                    __func__, f->desc->in, f->desc->out);
                return (EINVAL);
        }
 
        info = malloc(sizeof(*info), M_DEVBUF, M_NOWAIT | M_ZERO);
        if (info == NULL)
                return (ENOMEM);
 
        info->channels = AFMT_CHANNEL(f->desc->in);
 
        info->ibps = AFMT_BPS(f->desc->in);
        info->ialign = info->ibps * info->channels;
        info->read = rd_op;
 
        info->obps = AFMT_BPS(f->desc->out);
        info->oalign = info->obps * info->channels;
        info->write = wr_op;
 
        f->data = info;
 
        return (0);
}
 
static int
feed_format_free(struct pcm_feeder *f)
{
        struct feed_format_info *info;
 
        info = f->data;
        if (info != NULL)
                free(info, M_DEVBUF);
 
        f->data = NULL;
 
        return (0);
}
 
static int
feed_format_set(struct pcm_feeder *f, int what, int value)
{
        struct feed_format_info *info;
 
        info = f->data;
 
        switch (what) {
        case FEEDFORMAT_CHANNELS:
                if (value < SND_CHN_MIN || value > SND_CHN_MAX)
                        return (EINVAL);
                info->channels = (uint32_t)value;
                info->ialign = info->ibps * info->channels;
                info->oalign = info->obps * info->channels;
                break;
        default:
                return (EINVAL);
                break;
        }
 
        return (0);
}
 
static int
feed_format_feed(struct pcm_feeder *f, struct pcm_channel *c, uint8_t *b,
    uint32_t count, void *source)
{
        struct feed_format_info *info;
        intpcm_t v;
        uint32_t j;
        uint8_t *src, *dst;
 
        info = f->data;
        dst = b;
        count = SND_FXROUND(count, info->oalign);
 
        do {
                if (count < info->oalign)
                        break;
 
                if (count < info->ialign) {
                        src = info->reservoir;
                        j = info->ialign;
                } else {
                        if (info->ialign == info->oalign)
                                j = count;
                        else if (info->ialign > info->oalign)
                                j = SND_FXROUND(count, info->ialign);
                        else
                                j = SND_FXDIV(count, info->oalign) *
                                    info->ialign;
                        src = dst + count - j;
                }
 
                j = SND_FXDIV(FEEDER_FEED(f->source, c, src, j, source),
                    info->ialign);
                if (j == 0)
                        break;
 
                j *= info->channels;
                count -= j * info->obps;
 
                do {
                        v = info->read(src);
                        info->write(dst, v);
                        dst += info->obps;
                        src += info->ibps;
                } while (--j != 0);
 
        } while (count != 0);
 
        return (dst - b);
}
 
static struct pcm_feederdesc feeder_format_desc[] = {
        { FEEDER_FORMAT, 0, 0, 0, 0 },
        { 0, 0, 0, 0, 0 }
};
 
static kobj_method_t feeder_format_methods[] = {
        KOBJMETHOD(feeder_init,         feed_format_init),
        KOBJMETHOD(feeder_free,         feed_format_free),
        KOBJMETHOD(feeder_set,          feed_format_set),
        KOBJMETHOD(feeder_feed,         feed_format_feed),
        KOBJMETHOD_END
};
 
FEEDER_DECLARE(feeder_format, NULL);
 
/* Extern */
intpcm_read_t *
feeder_format_read_op(uint32_t format)
{
        int i;
 
        for (i = 0; i < FEEDFORMAT_TAB_SIZE; i++) {
                if (AFMT_ENCODING(format) == feed_format_ops[i].format)
                        return (feed_format_ops[i].read);
        }
 
        return (NULL);
}
 
intpcm_write_t *
feeder_format_write_op(uint32_t format)
{
        int i;
 
        for (i = 0; i < FEEDFORMAT_TAB_SIZE; i++) {
                if (AFMT_ENCODING(format) == feed_format_ops[i].format)
                        return (feed_format_ops[i].write);
        }
 
        return (NULL);
}