source: mainline/uspace/app/dplay/dplay.c@ b499127

/*
 * Copyright (c) 2011 Jan Vesely
 * All rights reserved.
 *
 * 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 */

/** @addtogroup dplay
 * @{
 */
/**
 * @file PCM playback audio devices
 */

#include <assert.h>
#include <errno.h>
#include <str_error.h>
#include <str.h>
#include <devman.h>
#include <audio_pcm_buffer_iface.h>
#include <stdio.h>
#include <sys/mman.h>
#include <sys/time.h>

#include "beep.h"

#define DEFAULT_DEVICE "/hw/pci0/00:01.0/sb16/dsp"

static void play(async_exch_t *device, unsigned buffer_id,
    void *buffer, size_t size, const void *data, size_t data_size,
    unsigned sampling_rate, unsigned sample_size, unsigned channels, bool sign)
{
        assert(device);
        const void* data_end = data + data_size;
        const size_t half_buf = size / 2;

        /* Time to play half the buffer. */
        const unsigned interval = 1000000 /
            (sampling_rate /  (half_buf / (channels * (sample_size / 8))));
        printf("Time to play half buffer: %zu us.\n", interval);
        /* Initialize buffer. */
        memcpy(buffer, data, size);
        data += size;

        struct timeval time;
        gettimeofday(&time, NULL);
        printf("Starting playback.\n");
        int ret = audio_pcm_buffer_start_playback(device, buffer_id,
            sampling_rate, sample_size, channels, sign);
        if (ret != EOK) {
                printf("Failed to start playback: %s.\n", str_error(ret));
                return;
        }
        void *buffer_place = buffer;
        while (data < data_end) {
                tv_add(&time, interval); /* Next update point */
                struct timeval current;
                gettimeofday(&current, NULL);

                const suseconds_t delay = tv_sub(&time, &current);
                if (delay > 0)
                        usleep(delay);
                const size_t remain = data_end - data;
                if (remain < half_buf) {
                        memcpy(buffer_place, data, remain);
                        bzero(buffer_place + remain, half_buf - remain);
                        data += remain;
                } else {
                        memcpy(buffer_place, data, half_buf);
                        data += half_buf;
                }
                if (buffer_place == buffer) {
                        buffer_place = buffer + half_buf;
                } else {
                        buffer_place = buffer;
                }
        }

        printf("Stopping playback.\n");
        ret = audio_pcm_buffer_stop_playback(device, buffer_id);
        if (ret != EOK) {
                printf("Failed to stop playback: %s.\n", str_error(ret));
        }
}

int main(int argc, char *argv[])
{
        const char *device = DEFAULT_DEVICE;
        if (argc == 2)
                device = argv[1];


        devman_handle_t pcm_handle;
        int ret = devman_fun_get_handle(device, &pcm_handle, 0);
        if (ret != EOK) {
                printf("Failed to get device(%s) handle: %s.\n",
                    device, str_error(ret));
                return 1;
        }

        async_sess_t *session = devman_device_connect(
            EXCHANGE_ATOMIC, pcm_handle, IPC_FLAG_BLOCKING);
        if (!session) {
                printf("Failed to connect to device.\n");
                return 1;
        }

        async_exch_t *exch = async_exchange_begin(session);
        if (!exch) {
                printf("Failed to start session exchange.\n");
                async_hangup(session);
                return 1;
        }
        const char* info;
        ret = audio_pcm_buffer_get_info_str(exch, &info);
        if (ret != EOK) {
                printf("Failed to get PCM info.\n");
                async_exchange_end(exch);
                async_hangup(session);
                return 1;
        }
        printf("Playing on %s.\n", info);
        free(info);

        void *buffer = NULL;
        size_t size = 0;
        unsigned id = 0;
        ret = audio_pcm_buffer_get_buffer(exch, &buffer, &size, &id);
        if (ret != EOK) {
                printf("Failed to get PCM buffer: %s.\n", str_error(ret));
                async_exchange_end(exch);
                async_hangup(session);
                return 1;
        }
        printf("Buffer (%u): %p %zu.\n", id, buffer, size);

        play(exch, id, buffer, size, beep, beep_size,
            rate, sample_size, channels, sign);

        munmap(buffer, size);
        audio_pcm_buffer_release_buffer(exch, id);
        async_exchange_end(exch);
        async_hangup(session);
        return 0;
}
/**
 * @}
 */