put source files into src dir

1 files changed, 0 insertions, 1097 deletions

diff --git a/pcm.c b/pcm.c
deleted file mode 100644
index 24ab333..0000000
--- a/pcm.c
+++ /dev/null
@@ -1,1097 +0,0 @@
-/* pcm.c
-**
-** Copyright 2011, The Android Open Source Project
-**
-** Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are met:
-**     * Redistributions of source code must retain the above copyright
-**       notice, this list of conditions and the following disclaimer.
-**     * 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.
-**     * Neither the name of The Android Open Source Project nor the names of
-**       its contributors may be used to endorse or promote products derived
-**       from this software without specific prior written permission.
-**
-** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``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 Android Open Source Project 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.
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <stdarg.h>
-#include <string.h>
-#include <errno.h>
-#include <unistd.h>
-#include <poll.h>
-
-#include <sys/ioctl.h>
-#include <sys/mman.h>
-#include <sys/time.h>
-#include <time.h>
-#include <limits.h>
-
-#include <linux/ioctl.h>
-#define __force
-#define __bitwise
-#define __user
-#include <sound/asound.h>
-
-#include <tinyalsa/asoundlib.h>
-
-#define PARAM_MAX SNDRV_PCM_HW_PARAM_LAST_INTERVAL
-#define SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP (1<<2)
-
-static inline int param_is_mask(int p)
-{
-    return (p >= SNDRV_PCM_HW_PARAM_FIRST_MASK) &&
-        (p <= SNDRV_PCM_HW_PARAM_LAST_MASK);
-}
-
-static inline int param_is_interval(int p)
-{
-    return (p >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL) &&
-        (p <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL);
-}
-
-static inline struct snd_interval *param_to_interval(struct snd_pcm_hw_params *p, int n)
-{
-    return &(p->intervals[n - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]);
-}
-
-static inline struct snd_mask *param_to_mask(struct snd_pcm_hw_params *p, int n)
-{
-    return &(p->masks[n - SNDRV_PCM_HW_PARAM_FIRST_MASK]);
-}
-
-static void param_set_mask(struct snd_pcm_hw_params *p, int n, unsigned int bit)
-{
-    if (bit >= SNDRV_MASK_MAX)
-        return;
-    if (param_is_mask(n)) {
-        struct snd_mask *m = param_to_mask(p, n);
-        m->bits[0] = 0;
-        m->bits[1] = 0;
-        m->bits[bit >> 5] |= (1 << (bit & 31));
-    }
-}
-
-static void param_set_min(struct snd_pcm_hw_params *p, int n, unsigned int val)
-{
-    if (param_is_interval(n)) {
-        struct snd_interval *i = param_to_interval(p, n);
-        i->min = val;
-    }
-}
-
-static unsigned int param_get_min(struct snd_pcm_hw_params *p, int n)
-{
-    if (param_is_interval(n)) {
-        struct snd_interval *i = param_to_interval(p, n);
-        return i->min;
-    }
-    return 0;
-}
-
-static unsigned int param_get_max(struct snd_pcm_hw_params *p, int n)
-{
-    if (param_is_interval(n)) {
-        struct snd_interval *i = param_to_interval(p, n);
-        return i->max;
-    }
-    return 0;
-}
-
-static void param_set_int(struct snd_pcm_hw_params *p, int n, unsigned int val)
-{
-    if (param_is_interval(n)) {
-        struct snd_interval *i = param_to_interval(p, n);
-        i->min = val;
-        i->max = val;
-        i->integer = 1;
-    }
-}
-
-static unsigned int param_get_int(struct snd_pcm_hw_params *p, int n)
-{
-    if (param_is_interval(n)) {
-        struct snd_interval *i = param_to_interval(p, n);
-        if (i->integer)
-            return i->max;
-    }
-    return 0;
-}
-
-static void param_init(struct snd_pcm_hw_params *p)
-{
-    int n;
-
-    memset(p, 0, sizeof(*p));
-    for (n = SNDRV_PCM_HW_PARAM_FIRST_MASK;
-         n <= SNDRV_PCM_HW_PARAM_LAST_MASK; n++) {
-            struct snd_mask *m = param_to_mask(p, n);
-            m->bits[0] = ~0;
-            m->bits[1] = ~0;
-    }
-    for (n = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL;
-         n <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; n++) {
-            struct snd_interval *i = param_to_interval(p, n);
-            i->min = 0;
-            i->max = ~0;
-    }
-    p->rmask = ~0U;
-    p->cmask = 0;
-    p->info = ~0U;
-}
-
-#define PCM_ERROR_MAX 128
-
-struct pcm {
-    int fd;
-    unsigned int flags;
-    int running:1;
-    int prepared:1;
-    int underruns;
-    unsigned int buffer_size;
-    unsigned int boundary;
-    char error[PCM_ERROR_MAX];
-    struct pcm_config config;
-    struct snd_pcm_mmap_status *mmap_status;
-    struct snd_pcm_mmap_control *mmap_control;
-    struct snd_pcm_sync_ptr *sync_ptr;
-    void *mmap_buffer;
-    unsigned int noirq_frames_per_msec;
-    long pcm_delay;
-    unsigned int subdevice;
-};
-
-unsigned int pcm_get_buffer_size(struct pcm *pcm)
-{
-    return pcm->buffer_size;
-}
-
-int pcm_get_file_descriptor(struct pcm *pcm)
-{
-    return pcm->fd;
-}
-
-const char* pcm_get_error(struct pcm *pcm)
-{
-    return pcm->error;
-}
-
-unsigned int pcm_get_subdevice(struct pcm *pcm)
-{
-    return pcm->subdevice;
-}
-
-static int oops(struct pcm *pcm, int e, const char *fmt, ...)
-{
-    va_list ap;
-    int sz;
-
-    va_start(ap, fmt);
-    vsnprintf(pcm->error, PCM_ERROR_MAX, fmt, ap);
-    va_end(ap);
-    sz = strlen(pcm->error);
-
-    if (errno)
-        snprintf(pcm->error + sz, PCM_ERROR_MAX - sz,
-                 ": %s", strerror(e));
-    return -1;
-}
-
-static unsigned int pcm_format_to_alsa(enum pcm_format format)
-{
-    switch (format) {
-
-    case PCM_FORMAT_S8:
-        return SNDRV_PCM_FORMAT_S8;
-
-    default:
-    case PCM_FORMAT_S16_LE:
-        return SNDRV_PCM_FORMAT_S16_LE;
-    case PCM_FORMAT_S16_BE:
-        return SNDRV_PCM_FORMAT_S16_BE;
-
-    case PCM_FORMAT_S24_LE:
-        return SNDRV_PCM_FORMAT_S24_LE;
-    case PCM_FORMAT_S24_BE:
-        return SNDRV_PCM_FORMAT_S24_BE;
-
-    case PCM_FORMAT_S24_3LE:
-        return SNDRV_PCM_FORMAT_S24_3LE;
-    case PCM_FORMAT_S24_3BE:
-        return SNDRV_PCM_FORMAT_S24_3BE;
-
-    case PCM_FORMAT_S32_LE:
-        return SNDRV_PCM_FORMAT_S32_LE;
-    case PCM_FORMAT_S32_BE:
-        return SNDRV_PCM_FORMAT_S32_BE;
-    };
-}
-
-unsigned int pcm_format_to_bits(enum pcm_format format)
-{
-    switch (format) {
-    case PCM_FORMAT_S32_LE:
-    case PCM_FORMAT_S32_BE:
-    case PCM_FORMAT_S24_LE:
-    case PCM_FORMAT_S24_BE:
-        return 32;
-    case PCM_FORMAT_S24_3LE:
-    case PCM_FORMAT_S24_3BE:
-        return 24;
-    default:
-    case PCM_FORMAT_S16_LE:
-    case PCM_FORMAT_S16_BE:
-        return 16;
-    case PCM_FORMAT_S8:
-        return 8;
-    };
-}
-
-unsigned int pcm_bytes_to_frames(struct pcm *pcm, unsigned int bytes)
-{
-    return bytes / (pcm->config.channels *
-        (pcm_format_to_bits(pcm->config.format) >> 3));
-}
-
-unsigned int pcm_frames_to_bytes(struct pcm *pcm, unsigned int frames)
-{
-    return frames * pcm->config.channels *
-        (pcm_format_to_bits(pcm->config.format) >> 3);
-}
-
-static int pcm_sync_ptr(struct pcm *pcm, int flags)
-{
-    if (pcm->sync_ptr) {
-        pcm->sync_ptr->flags = flags;
-        if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SYNC_PTR, pcm->sync_ptr) < 0)
-            return -1;
-    }
-    return 0;
-}
-
-static int pcm_hw_mmap_status(struct pcm *pcm)
-{
-    if (pcm->sync_ptr)
-        return 0;
-
-    int page_size = sysconf(_SC_PAGE_SIZE);
-    pcm->mmap_status = mmap(NULL, page_size, PROT_READ, MAP_FILE | MAP_SHARED,
-                            pcm->fd, SNDRV_PCM_MMAP_OFFSET_STATUS);
-    if (pcm->mmap_status == MAP_FAILED)
-        pcm->mmap_status = NULL;
-    if (!pcm->mmap_status)
-        goto mmap_error;
-
-    pcm->mmap_control = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
-                             MAP_FILE | MAP_SHARED, pcm->fd, SNDRV_PCM_MMAP_OFFSET_CONTROL);
-    if (pcm->mmap_control == MAP_FAILED)
-        pcm->mmap_control = NULL;
-    if (!pcm->mmap_control) {
-        munmap(pcm->mmap_status, page_size);
-        pcm->mmap_status = NULL;
-        goto mmap_error;
-    }
-    pcm->mmap_control->avail_min = 1;
-
-    return 0;
-
-mmap_error:
-
-    pcm->sync_ptr = calloc(1, sizeof(*pcm->sync_ptr));
-    if (!pcm->sync_ptr)
-        return -ENOMEM;
-    pcm->mmap_status = &pcm->sync_ptr->s.status;
-    pcm->mmap_control = &pcm->sync_ptr->c.control;
-    pcm->mmap_control->avail_min = 1;
-    pcm_sync_ptr(pcm, 0);
-
-    return 0;
-}
-
-static void pcm_hw_munmap_status(struct pcm *pcm) {
-    if (pcm->sync_ptr) {
-        free(pcm->sync_ptr);
-        pcm->sync_ptr = NULL;
-    } else {
-        int page_size = sysconf(_SC_PAGE_SIZE);
-        if (pcm->mmap_status)
-            munmap(pcm->mmap_status, page_size);
-        if (pcm->mmap_control)
-            munmap(pcm->mmap_control, page_size);
-    }
-    pcm->mmap_status = NULL;
-    pcm->mmap_control = NULL;
-}
-
-static int pcm_areas_copy(struct pcm *pcm, unsigned int pcm_offset,
-                          char *buf, unsigned int src_offset,
-                          unsigned int frames)
-{
-    int size_bytes = pcm_frames_to_bytes(pcm, frames);
-    int pcm_offset_bytes = pcm_frames_to_bytes(pcm, pcm_offset);
-    int src_offset_bytes = pcm_frames_to_bytes(pcm, src_offset);
-
-    /* interleaved only atm */
-    if (pcm->flags & PCM_IN)
-        memcpy(buf + src_offset_bytes,
-               (char*)pcm->mmap_buffer + pcm_offset_bytes,
-               size_bytes);
-    else
-        memcpy((char*)pcm->mmap_buffer + pcm_offset_bytes,
-               buf + src_offset_bytes,
-               size_bytes);
-    return 0;
-}
-
-static int pcm_mmap_transfer_areas(struct pcm *pcm, char *buf,
-                                unsigned int offset, unsigned int size)
-{
-    void *pcm_areas;
-    int commit;
-    unsigned int pcm_offset, frames, count = 0;
-
-    while (size > 0) {
-        frames = size;
-        pcm_mmap_begin(pcm, &pcm_areas, &pcm_offset, &frames);
-        pcm_areas_copy(pcm, pcm_offset, buf, offset, frames);
-        commit = pcm_mmap_commit(pcm, pcm_offset, frames);
-        if (commit < 0) {
-            oops(pcm, commit, "failed to commit %d frames\n", frames);
-            return commit;
-        }
-
-        offset += commit;
-        count += commit;
-        size -= commit;
-    }
-    return count;
-}
-
-int pcm_get_htimestamp(struct pcm *pcm, unsigned int *avail,
-                       struct timespec *tstamp)
-{
-    int frames;
-    int rc;
-    snd_pcm_uframes_t hw_ptr;
-
-    if (!pcm_is_ready(pcm))
-        return -1;
-
-    rc = pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_APPL|SNDRV_PCM_SYNC_PTR_HWSYNC);
-    if (rc < 0)
-        return -1;
-
-    if ((pcm->mmap_status->state != PCM_STATE_RUNNING) &&
-            (pcm->mmap_status->state != PCM_STATE_DRAINING))
-        return -1;
-
-    *tstamp = pcm->mmap_status->tstamp;
-    if (tstamp->tv_sec == 0 && tstamp->tv_nsec == 0)
-        return -1;
-
-    hw_ptr = pcm->mmap_status->hw_ptr;
-    if (pcm->flags & PCM_IN)
-        frames = hw_ptr - pcm->mmap_control->appl_ptr;
-    else
-        frames = hw_ptr + pcm->buffer_size - pcm->mmap_control->appl_ptr;
-
-    if (frames < 0)
-        return -1;
-
-    *avail = (unsigned int)frames;
-
-    return 0;
-}
-
-int pcm_write(struct pcm *pcm, const void *data, unsigned int count)
-{
-    struct snd_xferi x;
-
-    if (pcm->flags & PCM_IN)
-        return -EINVAL;
-
-    x.buf = (void*)data;
-    x.frames = count / (pcm->config.channels *
-                        pcm_format_to_bits(pcm->config.format) / 8);
-
-    for (;;) {
-        if (!pcm->running) {
-            int prepare_error = pcm_prepare(pcm);
-            if (prepare_error)
-                return prepare_error;
-            if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x))
-                return oops(pcm, errno, "cannot write initial data");
-            pcm->running = 1;
-            return 0;
-        }
-        if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x)) {
-            pcm->prepared = 0;
-            pcm->running = 0;
-            if (errno == EPIPE) {
-                /* we failed to make our window -- try to restart if we are
-                 * allowed to do so.  Otherwise, simply allow the EPIPE error to
-                 * propagate up to the app level */
-                pcm->underruns++;
-                if (pcm->flags & PCM_NORESTART)
-                    return -EPIPE;
-                continue;
-            }
-            return oops(pcm, errno, "cannot write stream data");
-        }
-        return 0;
-    }
-}
-
-int pcm_read(struct pcm *pcm, void *data, unsigned int count)
-{
-    struct snd_xferi x;
-
-    if (!(pcm->flags & PCM_IN))
-        return -EINVAL;
-
-    x.buf = data;
-    x.frames = count / (pcm->config.channels *
-                        pcm_format_to_bits(pcm->config.format) / 8);
-
-    for (;;) {
-        if (!pcm->running) {
-            if (pcm_start(pcm) < 0) {
-                fprintf(stderr, "start error");
-                return -errno;
-            }
-        }
-        if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_READI_FRAMES, &x)) {
-            pcm->prepared = 0;
-            pcm->running = 0;
-            if (errno == EPIPE) {
-                    /* we failed to make our window -- try to restart */
-                pcm->underruns++;
-                continue;
-            }
-            return oops(pcm, errno, "cannot read stream data");
-        }
-        return 0;
-    }
-}
-
-static struct pcm bad_pcm = {
-    .fd = -1,
-};
-
-struct pcm_params *pcm_params_get(unsigned int card, unsigned int device,
-                                  unsigned int flags)
-{
-    struct snd_pcm_hw_params *params;
-    char fn[256];
-    int fd;
-
-    snprintf(fn, sizeof(fn), "/dev/snd/pcmC%uD%u%c", card, device,
-             flags & PCM_IN ? 'c' : 'p');
-
-    fd = open(fn, O_RDWR);
-    if (fd < 0) {
-        fprintf(stderr, "cannot open device '%s'\n", fn);
-        goto err_open;
-    }
-
-    params = calloc(1, sizeof(struct snd_pcm_hw_params));
-    if (!params)
-        goto err_calloc;
-
-    param_init(params);
-    if (ioctl(fd, SNDRV_PCM_IOCTL_HW_REFINE, params)) {
-        fprintf(stderr, "SNDRV_PCM_IOCTL_HW_REFINE error (%d)\n", errno);
-        goto err_hw_refine;
-    }
-
-    close(fd);
-
-    return (struct pcm_params *)params;
-
-err_hw_refine:
-    free(params);
-err_calloc:
-    close(fd);
-err_open:
-    return NULL;
-}
-
-void pcm_params_free(struct pcm_params *pcm_params)
-{
-    struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
-
-    if (params)
-        free(params);
-}
-
-static int pcm_param_to_alsa(enum pcm_param param)
-{
-    switch (param) {
-    case PCM_PARAM_ACCESS:
-        return SNDRV_PCM_HW_PARAM_ACCESS;
-    case PCM_PARAM_FORMAT:
-        return SNDRV_PCM_HW_PARAM_FORMAT;
-    case PCM_PARAM_SUBFORMAT:
-        return SNDRV_PCM_HW_PARAM_SUBFORMAT;
-    case PCM_PARAM_SAMPLE_BITS:
-        return SNDRV_PCM_HW_PARAM_SAMPLE_BITS;
-        break;
-    case PCM_PARAM_FRAME_BITS:
-        return SNDRV_PCM_HW_PARAM_FRAME_BITS;
-        break;
-    case PCM_PARAM_CHANNELS:
-        return SNDRV_PCM_HW_PARAM_CHANNELS;
-        break;
-    case PCM_PARAM_RATE:
-        return SNDRV_PCM_HW_PARAM_RATE;
-        break;
-    case PCM_PARAM_PERIOD_TIME:
-        return SNDRV_PCM_HW_PARAM_PERIOD_TIME;
-        break;
-    case PCM_PARAM_PERIOD_SIZE:
-        return SNDRV_PCM_HW_PARAM_PERIOD_SIZE;
-        break;
-    case PCM_PARAM_PERIOD_BYTES:
-        return SNDRV_PCM_HW_PARAM_PERIOD_BYTES;
-        break;
-    case PCM_PARAM_PERIODS:
-        return SNDRV_PCM_HW_PARAM_PERIODS;
-        break;
-    case PCM_PARAM_BUFFER_TIME:
-        return SNDRV_PCM_HW_PARAM_BUFFER_TIME;
-        break;
-    case PCM_PARAM_BUFFER_SIZE:
-        return SNDRV_PCM_HW_PARAM_BUFFER_SIZE;
-        break;
-    case PCM_PARAM_BUFFER_BYTES:
-        return SNDRV_PCM_HW_PARAM_BUFFER_BYTES;
-        break;
-    case PCM_PARAM_TICK_TIME:
-        return SNDRV_PCM_HW_PARAM_TICK_TIME;
-        break;
-
-    default:
-        return -1;
-    }
-}
-
-struct pcm_mask *pcm_params_get_mask(struct pcm_params *pcm_params,
-                                     enum pcm_param param)
-{
-    int p;
-    struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
-    if (params == NULL) {
-        return NULL;
-    }
-
-    p = pcm_param_to_alsa(param);
-    if (p < 0 || !param_is_mask(p)) {
-        return NULL;
-    }
-
-    return (struct pcm_mask *)param_to_mask(params, p);
-}
-
-unsigned int pcm_params_get_min(struct pcm_params *pcm_params,
-                                enum pcm_param param)
-{
-    struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
-    int p;
-
-    if (!params)
-        return 0;
-
-    p = pcm_param_to_alsa(param);
-    if (p < 0)
-        return 0;
-
-    return param_get_min(params, p);
-}
-
-unsigned int pcm_params_get_max(struct pcm_params *pcm_params,
-                                enum pcm_param param)
-{
-    struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params;
-    int p;
-
-    if (!params)
-        return 0;
-
-    p = pcm_param_to_alsa(param);
-    if (p < 0)
-        return 0;
-
-    return param_get_max(params, p);
-}
-
-int pcm_close(struct pcm *pcm)
-{
-    if (pcm == &bad_pcm)
-        return 0;
-
-    pcm_hw_munmap_status(pcm);
-
-    if (pcm->flags & PCM_MMAP) {
-        pcm_stop(pcm);
-        munmap(pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size));
-    }
-
-    if (pcm->fd >= 0)
-        close(pcm->fd);
-    pcm->prepared = 0;
-    pcm->running = 0;
-    pcm->buffer_size = 0;
-    pcm->fd = -1;
-    free(pcm);
-    return 0;
-}
-
-struct pcm *pcm_open(unsigned int card, unsigned int device,
-                     unsigned int flags, struct pcm_config *config)
-{
-    struct pcm *pcm;
-    struct snd_pcm_info info;
-    struct snd_pcm_hw_params params;
-    struct snd_pcm_sw_params sparams;
-    char fn[256];
-    int rc;
-
-    pcm = calloc(1, sizeof(struct pcm));
-    if (!pcm || !config)
-        return &bad_pcm; /* TODO: could support default config here */
-
-    pcm->config = *config;
-
-    snprintf(fn, sizeof(fn), "/dev/snd/pcmC%uD%u%c", card, device,
-             flags & PCM_IN ? 'c' : 'p');
-
-    pcm->flags = flags;
-    pcm->fd = open(fn, O_RDWR);
-    if (pcm->fd < 0) {
-        oops(pcm, errno, "cannot open device '%s'", fn);
-        return pcm;
-    }
-
-    if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_INFO, &info)) {
-        oops(pcm, errno, "cannot get info");
-        goto fail_close;
-    }
-    pcm->subdevice = info.subdevice;
-
-    param_init(&params);
-    param_set_mask(&params, SNDRV_PCM_HW_PARAM_FORMAT,
-                   pcm_format_to_alsa(config->format));
-    param_set_mask(&params, SNDRV_PCM_HW_PARAM_SUBFORMAT,
-                   SNDRV_PCM_SUBFORMAT_STD);
-    param_set_min(&params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, config->period_size);
-    param_set_int(&params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
-                  pcm_format_to_bits(config->format));
-    param_set_int(&params, SNDRV_PCM_HW_PARAM_FRAME_BITS,
-                  pcm_format_to_bits(config->format) * config->channels);
-    param_set_int(&params, SNDRV_PCM_HW_PARAM_CHANNELS,
-                  config->channels);
-    param_set_int(&params, SNDRV_PCM_HW_PARAM_PERIODS, config->period_count);
-    param_set_int(&params, SNDRV_PCM_HW_PARAM_RATE, config->rate);
-
-    if (flags & PCM_NOIRQ) {
-
-        if (!(flags & PCM_MMAP)) {
-            oops(pcm, -EINVAL, "noirq only currently supported with mmap().");
-            goto fail;
-        }
-
-        params.flags |= SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP;
-        pcm->noirq_frames_per_msec = config->rate / 1000;
-    }
-
-    if (flags & PCM_MMAP)
-        param_set_mask(&params, SNDRV_PCM_HW_PARAM_ACCESS,
-                   SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
-    else
-        param_set_mask(&params, SNDRV_PCM_HW_PARAM_ACCESS,
-                   SNDRV_PCM_ACCESS_RW_INTERLEAVED);
-
-    if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_HW_PARAMS, &params)) {
-        oops(pcm, errno, "cannot set hw params");
-        goto fail_close;
-    }
-
-    /* get our refined hw_params */
-    config->period_size = param_get_int(&params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
-    config->period_count = param_get_int(&params, SNDRV_PCM_HW_PARAM_PERIODS);
-    pcm->buffer_size = config->period_count * config->period_size;
-
-    if (flags & PCM_MMAP) {
-        pcm->mmap_buffer = mmap(NULL, pcm_frames_to_bytes(pcm, pcm->buffer_size),
-                                PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, pcm->fd, 0);
-        if (pcm->mmap_buffer == MAP_FAILED) {
-            oops(pcm, -errno, "failed to mmap buffer %d bytes\n",
-                 pcm_frames_to_bytes(pcm, pcm->buffer_size));
-            goto fail_close;
-        }
-    }
-
-
-    memset(&sparams, 0, sizeof(sparams));
-    sparams.tstamp_mode = SNDRV_PCM_TSTAMP_ENABLE;
-    sparams.period_step = 1;
-    sparams.avail_min = 1;
-
-    if (!config->start_threshold) {
-        if (pcm->flags & PCM_IN)
-            pcm->config.start_threshold = sparams.start_threshold = 1;
-        else
-            pcm->config.start_threshold = sparams.start_threshold =
-                config->period_count * config->period_size / 2;
-    } else
-        sparams.start_threshold = config->start_threshold;
-
-    /* pick a high stop threshold - todo: does this need further tuning */
-    if (!config->stop_threshold) {
-        if (pcm->flags & PCM_IN)
-            pcm->config.stop_threshold = sparams.stop_threshold =
-                config->period_count * config->period_size * 10;
-        else
-            pcm->config.stop_threshold = sparams.stop_threshold =
-                config->period_count * config->period_size;
-    }
-    else
-        sparams.stop_threshold = config->stop_threshold;
-
-    sparams.xfer_align = config->period_size / 2; /* needed for old kernels */
-    sparams.silence_size = 0;
-    sparams.silence_threshold = config->silence_threshold;
-    pcm->boundary = sparams.boundary = pcm->buffer_size;
-
-    while (pcm->boundary * 2 <= INT_MAX - pcm->buffer_size)
-		pcm->boundary *= 2;
-
-    if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SW_PARAMS, &sparams)) {
-        oops(pcm, errno, "cannot set sw params");
-        goto fail;
-    }
-
-    rc = pcm_hw_mmap_status(pcm);
-    if (rc < 0) {
-        oops(pcm, rc, "mmap status failed");
-        goto fail;
-    }
-
-#ifdef SNDRV_PCM_IOCTL_TTSTAMP
-    if (pcm->flags & PCM_MONOTONIC) {
-        int arg = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
-        rc = ioctl(pcm->fd, SNDRV_PCM_IOCTL_TTSTAMP, &arg);
-        if (rc < 0) {
-            oops(pcm, rc, "cannot set timestamp type");
-            goto fail;
-        }
-    }
-#endif
-
-    pcm->underruns = 0;
-    return pcm;
-
-fail:
-    if (flags & PCM_MMAP)
-        munmap(pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size));
-fail_close:
-    close(pcm->fd);
-    pcm->fd = -1;
-    return pcm;
-}
-
-int pcm_is_ready(struct pcm *pcm)
-{
-    return pcm->fd >= 0;
-}
-
-int pcm_prepare(struct pcm *pcm)
-{
-    if (pcm->prepared)
-        return 0;
-
-    if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE) < 0)
-        return oops(pcm, errno, "cannot prepare channel");
-
-    pcm->prepared = 1;
-    return 0;
-}
-
-int pcm_start(struct pcm *pcm)
-{
-    int prepare_error = pcm_prepare(pcm);
-    if (prepare_error)
-        return prepare_error;
-
-    if (pcm->flags & PCM_MMAP)
-	    pcm_sync_ptr(pcm, 0);
-
-    if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START) < 0)
-        return oops(pcm, errno, "cannot start channel");
-
-    pcm->running = 1;
-    return 0;
-}
-
-int pcm_stop(struct pcm *pcm)
-{
-    if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_DROP) < 0)
-        return oops(pcm, errno, "cannot stop channel");
-
-    pcm->prepared = 0;
-    pcm->running = 0;
-    return 0;
-}
-
-static inline int pcm_mmap_playback_avail(struct pcm *pcm)
-{
-    int avail;
-
-    avail = pcm->mmap_status->hw_ptr + pcm->buffer_size - pcm->mmap_control->appl_ptr;
-
-    if (avail < 0)
-        avail += pcm->boundary;
-    else if (avail >= (int)pcm->boundary)
-        avail -= pcm->boundary;
-
-    return avail;
-}
-
-static inline int pcm_mmap_capture_avail(struct pcm *pcm)
-{
-    int avail = pcm->mmap_status->hw_ptr - pcm->mmap_control->appl_ptr;
-    if (avail < 0)
-        avail += pcm->boundary;
-    return avail;
-}
-
-static inline int pcm_mmap_avail(struct pcm *pcm)
-{
-    pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_HWSYNC);
-    if (pcm->flags & PCM_IN)
-        return pcm_mmap_capture_avail(pcm);
-    else
-        return pcm_mmap_playback_avail(pcm);
-}
-
-static void pcm_mmap_appl_forward(struct pcm *pcm, int frames)
-{
-    unsigned int appl_ptr = pcm->mmap_control->appl_ptr;
-    appl_ptr += frames;
-
-    /* check for boundary wrap */
-    if (appl_ptr > pcm->boundary)
-         appl_ptr -= pcm->boundary;
-    pcm->mmap_control->appl_ptr = appl_ptr;
-}
-
-int pcm_mmap_begin(struct pcm *pcm, void **areas, unsigned int *offset,
-                   unsigned int *frames)
-{
-    unsigned int continuous, copy_frames, avail;
-
-    /* return the mmap buffer */
-    *areas = pcm->mmap_buffer;
-
-    /* and the application offset in frames */
-    *offset = pcm->mmap_control->appl_ptr % pcm->buffer_size;
-
-    avail = pcm_mmap_avail(pcm);
-    if (avail > pcm->buffer_size)
-        avail = pcm->buffer_size;
-    continuous = pcm->buffer_size - *offset;
-
-    /* we can only copy frames if the are availabale and continuos */
-    copy_frames = *frames;
-    if (copy_frames > avail)
-        copy_frames = avail;
-    if (copy_frames > continuous)
-        copy_frames = continuous;
-    *frames = copy_frames;
-
-    return 0;
-}
-
-int pcm_mmap_commit(struct pcm *pcm, unsigned int offset, unsigned int frames)
-{
-    /* not used */
-    (void) offset;
-
-    /* update the application pointer in userspace and kernel */
-    pcm_mmap_appl_forward(pcm, frames);
-    pcm_sync_ptr(pcm, 0);
-
-    return frames;
-}
-
-int pcm_avail_update(struct pcm *pcm)
-{
-    pcm_sync_ptr(pcm, 0);
-    return pcm_mmap_avail(pcm);
-}
-
-int pcm_state(struct pcm *pcm)
-{
-    int err = pcm_sync_ptr(pcm, 0);
-    if (err < 0)
-        return err;
-
-    return pcm->mmap_status->state;
-}
-
-int pcm_wait(struct pcm *pcm, int timeout)
-{
-    struct pollfd pfd;
-    int err;
-
-    pfd.fd = pcm->fd;
-    pfd.events = POLLIN | POLLOUT | POLLERR | POLLNVAL;
-
-    do {
-        /* let's wait for avail or timeout */
-        err = poll(&pfd, 1, timeout);
-        if (err < 0)
-            return -errno;
-
-        /* timeout ? */
-        if (err == 0)
-            return 0;
-
-        /* have we been interrupted ? */
-        if (errno == -EINTR)
-            continue;
-
-        /* check for any errors */
-        if (pfd.revents & (POLLERR | POLLNVAL)) {
-            switch (pcm_state(pcm)) {
-            case PCM_STATE_XRUN:
-                return -EPIPE;
-            case PCM_STATE_SUSPENDED:
-                return -ESTRPIPE;
-            case PCM_STATE_DISCONNECTED:
-                return -ENODEV;
-            default:
-                return -EIO;
-            }
-        }
-    /* poll again if fd not ready for IO */
-    } while (!(pfd.revents & (POLLIN | POLLOUT)));
-
-    return 1;
-}
-
-int pcm_mmap_transfer(struct pcm *pcm, const void *buffer, unsigned int bytes)
-{
-    int err = 0, frames, avail;
-    unsigned int offset = 0, count;
-
-    if (bytes == 0)
-        return 0;
-
-    count = pcm_bytes_to_frames(pcm, bytes);
-
-    while (count > 0) {
-
-        /* get the available space for writing new frames */
-        avail = pcm_avail_update(pcm);
-        if (avail < 0) {
-            fprintf(stderr, "cannot determine available mmap frames");
-            return err;
-        }
-
-        /* start the audio if we reach the threshold */
-	    if (!pcm->running &&
-            (pcm->buffer_size - avail) >= pcm->config.start_threshold) {
-            if (pcm_start(pcm) < 0) {
-               fprintf(stderr, "start error: hw 0x%x app 0x%x avail 0x%x\n",
-                    (unsigned int)pcm->mmap_status->hw_ptr,
-                    (unsigned int)pcm->mmap_control->appl_ptr,
-                    avail);
-                return -errno;
-            }
-        }
-
-        /* sleep until we have space to write new frames */
-        if (pcm->running &&
-            (unsigned int)avail < pcm->mmap_control->avail_min) {
-            int time = -1;
-
-            if (pcm->flags & PCM_NOIRQ)
-                time = (pcm->buffer_size - avail - pcm->mmap_control->avail_min)
-                        / pcm->noirq_frames_per_msec;
-
-            err = pcm_wait(pcm, time);
-            if (err < 0) {
-                pcm->prepared = 0;
-                pcm->running = 0;
-                fprintf(stderr, "wait error: hw 0x%x app 0x%x avail 0x%x\n",
-                    (unsigned int)pcm->mmap_status->hw_ptr,
-                    (unsigned int)pcm->mmap_control->appl_ptr,
-                    avail);
-                pcm->mmap_control->appl_ptr = 0;
-                return err;
-            }
-            continue;
-        }
-
-        frames = count;
-        if (frames > avail)
-            frames = avail;
-
-        if (!frames)
-            break;
-
-        /* copy frames from buffer */
-        frames = pcm_mmap_transfer_areas(pcm, (void *)buffer, offset, frames);
-        if (frames < 0) {
-            fprintf(stderr, "write error: hw 0x%x app 0x%x avail 0x%x\n",
-                    (unsigned int)pcm->mmap_status->hw_ptr,
-                    (unsigned int)pcm->mmap_control->appl_ptr,
-                    avail);
-            return frames;
-        }
-
-        offset += frames;
-        count -= frames;
-    }
-
-    return 0;
-}
-
-int pcm_mmap_write(struct pcm *pcm, const void *data, unsigned int count)
-{
-    if ((~pcm->flags) & (PCM_OUT | PCM_MMAP))
-        return -ENOSYS;
-
-    return pcm_mmap_transfer(pcm, (void *)data, count);
-}
-
-int pcm_mmap_read(struct pcm *pcm, void *data, unsigned int count)
-{
-    if ((~pcm->flags) & (PCM_IN | PCM_MMAP))
-        return -ENOSYS;
-
-    return pcm_mmap_transfer(pcm, data, count);
-}
-
-long pcm_get_delay(struct pcm *pcm)
-{
-    if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_DELAY, &pcm->pcm_delay) < 0)
-        return -1;
-
-    return pcm->pcm_delay;
-}