pa_smoother* pa_smoother_new(
        uint64_t adjust_time,
        uint64_t history_time,
        bool monotonic,
        bool smoothing,
        unsigned min_history,
        uint64_t time_offset,
        bool paused) {

    pa_smoother *s;

    pa_assert(adjust_time > 0);
    pa_assert(history_time > 0);
    pa_assert(min_history >= 2);
    pa_assert(min_history <= HISTORY_MAX);

    s = pa_xnew(pa_smoother, 1);
    s->adjust_time = adjust_time;
    s->history_time = history_time;
    s->min_history = min_history;
    s->monotonic = monotonic;
    s->smoothing = smoothing;

    pa_smoother_reset(s, time_offset, paused);

    return s;
}
Exemple #2
0
static void thread_func(void *userdata) {
    struct userdata *u = userdata;
    unsigned short revents = 0;
    int ret, err;
    audio_info_t info;

    pa_assert(u);

    pa_log_debug("Thread starting up");

    if (u->core->realtime_scheduling)
        pa_make_realtime(u->core->realtime_priority);

    pa_thread_mq_install(&u->thread_mq);

    pa_smoother_set_time_offset(u->smoother, pa_rtclock_now());

    for (;;) {
        /* Render some data and write it to the dsp */

        if (PA_UNLIKELY(u->sink->thread_info.rewind_requested))
            process_rewind(u);

        if (u->sink && PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
            pa_usec_t xtime0, ysleep_interval, xsleep_interval;
            uint64_t buffered_bytes;

            err = ioctl(u->fd, AUDIO_GETINFO, &info);
            if (err < 0) {
                pa_log("AUDIO_GETINFO ioctl failed: %s", pa_cstrerror(errno));
                goto fail;
            }

            if (info.play.error) {
                pa_log_debug("buffer under-run!");

                AUDIO_INITINFO(&info);
                info.play.error = 0;
                if (ioctl(u->fd, AUDIO_SETINFO, &info) < 0)
                    pa_log("AUDIO_SETINFO: %s", pa_cstrerror(errno));

                pa_smoother_reset(u->smoother, pa_rtclock_now(), true);
            }

            for (;;) {
                void *p;
                ssize_t w;
                size_t len;
                int write_type = 1;

                /*
                 * Since we cannot modify the size of the output buffer we fake it
                 * by not filling it more than u->buffer_size.
                 */
                xtime0 = pa_rtclock_now();
                buffered_bytes = get_playback_buffered_bytes(u);
                if (buffered_bytes >= (uint64_t)u->buffer_size)
                    break;

                len = u->buffer_size - buffered_bytes;
                len -= len % u->frame_size;

                if (len < (size_t) u->minimum_request)
                    break;

                if (!u->memchunk.length)
                    pa_sink_render(u->sink, u->sink->thread_info.max_request, &u->memchunk);

                len = PA_MIN(u->memchunk.length, len);

                p = pa_memblock_acquire(u->memchunk.memblock);
                w = pa_write(u->fd, (uint8_t*) p + u->memchunk.index, len, &write_type);
                pa_memblock_release(u->memchunk.memblock);

                if (w <= 0) {
                    if (errno == EINTR) {
                        continue;
                    } else if (errno == EAGAIN) {
                        /* We may have realtime priority so yield the CPU to ensure that fd can become writable again. */
                        pa_log_debug("EAGAIN with %llu bytes buffered.", buffered_bytes);
                        break;
                    } else {
                        pa_log("Failed to write data to DSP: %s", pa_cstrerror(errno));
                        goto fail;
                    }
                } else {
                    pa_assert(w % u->frame_size == 0);

                    u->written_bytes += w;
                    u->memchunk.index += w;
                    u->memchunk.length -= w;
                    if (u->memchunk.length <= 0) {
                        pa_memblock_unref(u->memchunk.memblock);
                        pa_memchunk_reset(&u->memchunk);
                    }
                }
            }

            ysleep_interval = pa_bytes_to_usec(buffered_bytes / 2, &u->sink->sample_spec);
            xsleep_interval = pa_smoother_translate(u->smoother, xtime0, ysleep_interval);
            pa_rtpoll_set_timer_absolute(u->rtpoll, xtime0 + PA_MIN(xsleep_interval, ysleep_interval));
        } else
            pa_rtpoll_set_timer_disabled(u->rtpoll);

        /* Try to read some data and pass it on to the source driver */

        if (u->source && PA_SOURCE_IS_OPENED(u->source->thread_info.state) && (revents & POLLIN)) {
            pa_memchunk memchunk;
            void *p;
            ssize_t r;
            size_t len;

            err = ioctl(u->fd, AUDIO_GETINFO, &info);
            pa_assert(err >= 0);

            if (info.record.error) {
                pa_log_debug("buffer overflow!");

                AUDIO_INITINFO(&info);
                info.record.error = 0;
                if (ioctl(u->fd, AUDIO_SETINFO, &info) < 0)
                    pa_log("AUDIO_SETINFO: %s", pa_cstrerror(errno));
            }

            err = ioctl(u->fd, I_NREAD, &len);
            pa_assert(err >= 0);

            if (len > 0) {
                memchunk.memblock = pa_memblock_new(u->core->mempool, len);
                pa_assert(memchunk.memblock);

                p = pa_memblock_acquire(memchunk.memblock);
                r = pa_read(u->fd, p, len, NULL);
                pa_memblock_release(memchunk.memblock);

                if (r < 0) {
                    pa_memblock_unref(memchunk.memblock);
                    if (errno == EAGAIN)
                        break;
                    else {
                        pa_log("Failed to read data from DSP: %s", pa_cstrerror(errno));
                        goto fail;
                    }
                } else {
                    u->read_bytes += r;

                    memchunk.index = 0;
                    memchunk.length = r;

                    pa_source_post(u->source, &memchunk);
                    pa_memblock_unref(memchunk.memblock);

                    revents &= ~POLLIN;
                }
            }
        }

        if (u->rtpoll_item) {
            struct pollfd *pollfd;

            pa_assert(u->fd >= 0);

            pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
            pollfd->events = (u->source && PA_SOURCE_IS_OPENED(u->source->thread_info.state)) ? POLLIN : 0;
        }

        /* Hmm, nothing to do. Let's sleep */
        if ((ret = pa_rtpoll_run(u->rtpoll, true)) < 0)
            goto fail;

        if (ret == 0)
            goto finish;

        if (u->rtpoll_item) {
            struct pollfd *pollfd;

            pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);

            if (pollfd->revents & ~(POLLOUT|POLLIN)) {
                pa_log("DSP shutdown.");
                goto fail;
            }

            revents = pollfd->revents;
        } else
            revents = 0;
    }

fail:
    /* We have to continue processing messages until we receive the
     * SHUTDOWN message */
    pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
    pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);

finish:
    pa_log_debug("Thread shutting down");
}