C++ pa_memblock_unref函数代码示例

static void process_render(struct userdata *u, pa_usec_t now) {
    pa_memchunk chunk;
    int request_bytes;
    //int index;

    pa_assert(u);

    if (u->got_max_latency) {
        return;
    }

    //index = 0;
    while (u->timestamp < now + u->block_usec) {
        //index++;
        //if (index > 3) {
            /* used when u->block_usec and
               u->sink->thread_info.max_request get big
               using got_max_latency now */
        //    return;
        //}
        request_bytes = u->sink->thread_info.max_request;
        request_bytes = MIN(request_bytes, 16 * 1024);
        pa_sink_render(u->sink, request_bytes, &chunk);
        //pa_log("bytes %d index %d", chunk.length, index);
        data_send(u, &chunk);
        pa_memblock_unref(chunk.memblock);
        u->timestamp += pa_bytes_to_usec(chunk.length, &u->sink->sample_spec);
    }
}

void pa__done(pa_module*m) {
    struct userdata *u;
    pa_assert(m);

    if (!(u = m->userdata))
        return;

    if (u->sink)
        pa_sink_unlink(u->sink);

    if (u->thread) {
        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
        pa_thread_free(u->thread);
    }

    pa_thread_mq_done(&u->thread_mq);

    if (u->sink)
        pa_sink_unref(u->sink);

    if (u->rtpoll_item)
        pa_rtpoll_item_free(u->rtpoll_item);

    if (u->rtpoll)
        pa_rtpoll_free(u->rtpoll);

    if (u->raw_memchunk.memblock)
        pa_memblock_unref(u->raw_memchunk.memblock);

    if (u->encoded_memchunk.memblock)
        pa_memblock_unref(u->encoded_memchunk.memblock);

    if (u->raop)
        pa_raop_client_free(u->raop);

    pa_xfree(u->read_data);
    pa_xfree(u->write_data);

    if (u->smoother)
        pa_smoother_free(u->smoother);

    if (u->fd >= 0)
        pa_close(u->fd);

    pa_xfree(u);
}

static void *mi6k_render_thread(void *userdata)
{
    while (1) {
	pa_memchunk chunk;
	int i;
	int is_empty = 1;
	static int sleeptimer = 0;

	i = pa_memblockq_peek(mi6k.queue, &chunk);

	/*
	 * Before writing this chunk, let's see if there's anything
	 * printable in it. For our purposes, these include
	 * special characters but not control characters: thus, anything
	 * above the space.
	 */
	for (i=0; i<chunk.length; i++) {
	  int c = ((unsigned char*)chunk.memblock->data)[chunk.index + i];
	  if (c > ' ') {
	    is_empty = 0;
	  }
	}

	if (is_empty) {
	    if (mi6k.power) {
		/*
		 * We're rendering blank frames. Our sleep timer counts down...
		 * If we stay blank for quite a while, power down the VFD.
		 */
		if (++sleeptimer > AUTO_OFF_FRAMES) {
		    mi6k_set_power(0);
		}
	    }
	} else {
	    sleeptimer = 0;

	    if (!mi6k.power) {
		/*
		 * We're rendering non-blank frames, but the display is off.
		 * Turn on the juice, wait for it to start up, then do our initialization.
		 */
		
		mi6k_set_power(1);
		usleep(200000);
		mi6k_init_hardware();
	    }
	}
  	
	fwrite(chunk.memblock->data + chunk.index, 1, chunk.length, mi6k.device);
	fflush(mi6k.device);

	pa_memblock_unref(chunk.memblock);
	pa_memblockq_drop(mi6k.queue, &chunk, chunk.length);
    }
    return NULL;
}

static int do_read(connection *c) {
    pa_memchunk chunk;
    ssize_t r;
    size_t l;
    void *p;
    size_t space = 0;

    connection_assert_ref(c);

    if (!c->sink_input || (l = (size_t) pa_atomic_load(&c->playback.missing)) <= 0)
        return 0;

    if (c->playback.current_memblock) {

        space = pa_memblock_get_length(c->playback.current_memblock) - c->playback.memblock_index;

        if (space <= 0) {
            pa_memblock_unref(c->playback.current_memblock);
            c->playback.current_memblock = NULL;
        }
    }

    if (!c->playback.current_memblock) {
        pa_assert_se(c->playback.current_memblock = pa_memblock_new(c->protocol->core->mempool, (size_t) -1));
        c->playback.memblock_index = 0;

        space = pa_memblock_get_length(c->playback.current_memblock);
    }

    if (l > space)
        l = space;

    p = pa_memblock_acquire(c->playback.current_memblock);
    r = pa_iochannel_read(c->io, (uint8_t*) p + c->playback.memblock_index, l);
    pa_memblock_release(c->playback.current_memblock);

    if (r <= 0) {

        if (r < 0 && (errno == EINTR || errno == EAGAIN))
            return 0;

        pa_log_debug("read(): %s", r == 0 ? "EOF" : pa_cstrerror(errno));
        return -1;
    }

    chunk.memblock = c->playback.current_memblock;
    chunk.index = c->playback.memblock_index;
    chunk.length = (size_t) r;

    c->playback.memblock_index += (size_t) r;

    pa_asyncmsgq_post(c->sink_input->sink->asyncmsgq, PA_MSGOBJECT(c->sink_input), SINK_INPUT_MESSAGE_POST_DATA, NULL, 0, &chunk, NULL);
    pa_atomic_sub(&c->playback.missing, (int) r);

    return 0;
}

/* No lock necessary. This function is not multiple caller safe*/
void pa_memblock_unref_fixed(pa_memblock *b) {
    pa_assert(b);
    pa_assert(PA_REFCNT_VALUE(b) > 0);
    pa_assert(b->type == PA_MEMBLOCK_FIXED);

    if (PA_REFCNT_VALUE(b) > 1)
        memblock_make_local(b);

    pa_memblock_unref(b);
}

void pa_silence_cache_done(pa_silence_cache *cache) {
    pa_sample_format_t f;
    pa_assert(cache);

    for (f = 0; f < PA_SAMPLE_MAX; f++)
        if (cache->blocks[f])
            pa_memblock_unref(cache->blocks[f]);

    memset(cache, 0, sizeof(pa_silence_cache));
}

static void do_read(struct userdata *u) {
    uint32_t free_frags;
    pa_memchunk memchunk;
    WAVEHDR *hdr;
    MMRESULT res;
    void *p;

    if (!u->source)
        return;

    if (!PA_SOURCE_IS_LINKED(u->source->state))
        return;

    EnterCriticalSection(&u->crit);
    free_frags = u->free_ifrags;
    u->free_ifrags = 0;
    LeaveCriticalSection(&u->crit);

    if (free_frags == u->fragments)
        pa_log_debug("WaveIn overflow!");

    while (free_frags) {
        hdr = &u->ihdrs[u->cur_ihdr];
        if (hdr->dwFlags & WHDR_PREPARED)
            waveInUnprepareHeader(u->hwi, hdr, sizeof(WAVEHDR));

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

            p = pa_memblock_acquire(memchunk.memblock);
            memcpy((char*) p, hdr->lpData, hdr->dwBytesRecorded);
            pa_memblock_release(memchunk.memblock);

            memchunk.length = hdr->dwBytesRecorded;
            memchunk.index = 0;

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

        res = waveInPrepareHeader(u->hwi, hdr, sizeof(WAVEHDR));
        if (res != MMSYSERR_NOERROR)
            pa_log_error("Unable to prepare waveIn block: %d", res);

        res = waveInAddBuffer(u->hwi, hdr, sizeof(WAVEHDR));
        if (res != MMSYSERR_NOERROR)
            pa_log_error("Unable to add waveIn block: %d", res);

        free_frags--;
        u->cur_ihdr++;
        u->cur_ihdr %= u->fragments;
    }
}

static void thread_func(void *userdata) {
    struct userdata *u = userdata;

    pa_assert(u);

    pa_log_debug("Thread starting up");

    pa_thread_mq_install(&u->thread_mq);

    u->timestamp = pa_rtclock_now();

    for (;;) {
        int ret;

        /* Generate some null data */
        if (PA_SOURCE_IS_OPENED(u->source->thread_info.state)) {
            pa_usec_t now;
            pa_memchunk chunk;

            now = pa_rtclock_now();

            if ((chunk.length = pa_usec_to_bytes(now - u->timestamp, &u->source->sample_spec)) > 0) {

                chunk.memblock = pa_memblock_new(u->core->mempool, (size_t) -1); /* or chunk.length? */
                chunk.index = 0;
                pa_source_post(u->source, &chunk);
                pa_memblock_unref(chunk.memblock);

                u->timestamp = now;
            }

            pa_rtpoll_set_timer_absolute(u->rtpoll, u->timestamp + u->latency_time * PA_USEC_PER_MSEC);
        } else
            pa_rtpoll_set_timer_disabled(u->rtpoll);

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

        if (ret == 0)
            goto finish;
    }

fail:
    /* If this was no regular exit from the loop we have to continue
     * processing messages until we received PA_MESSAGE_SHUTDOWN */
    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");
}

static void free_entry(pa_scache_entry *e) {
    pa_assert(e);

    pa_namereg_unregister(e->core, e->name);
    pa_subscription_post(e->core, PA_SUBSCRIPTION_EVENT_SAMPLE_CACHE|PA_SUBSCRIPTION_EVENT_REMOVE, e->index);
    pa_xfree(e->name);
    pa_xfree(e->filename);
    if (e->memchunk.memblock)
        pa_memblock_unref(e->memchunk.memblock);
    if (e->proplist)
        pa_proplist_free(e->proplist);
    pa_xfree(e);
}

/* Called from I/O thread context */
static void cmtspeech_sink_input_reset_dl_stream(struct userdata *u) {
    cmtspeech_dl_buf_t *buf;
    pa_assert(u);

    /* Flush all DL buffers */
    pa_memblockq_flush_read(u->dl_memblockq);
    cmtspeech_dl_sideinfo_flush(u);
    while ((buf = pa_asyncq_pop(u->cmt_connection.dl_frame_queue, FALSE))) {
        pa_memchunk cmtchunk;
        if (0 == cmtspeech_buffer_to_memchunk(u, buf, &cmtchunk))
            pa_memblock_unref(cmtchunk.memblock);
    }
}

void pa__done(pa_module *m) {
    struct userdata *u;

    pa_assert(m);

    if (!(u = m->userdata))
        return;

    if (u->sig) {
        ioctl(u->fd, I_SETSIG, 0);
        pa_signal_free(u->sig);
    }

    if (u->sink)
        pa_sink_unlink(u->sink);

    if (u->source)
        pa_source_unlink(u->source);

    if (u->thread) {
        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
        pa_thread_free(u->thread);
    }

    pa_thread_mq_done(&u->thread_mq);

    if (u->sink)
        pa_sink_unref(u->sink);

    if (u->source)
        pa_source_unref(u->source);

    if (u->memchunk.memblock)
        pa_memblock_unref(u->memchunk.memblock);

    if (u->rtpoll_item)
        pa_rtpoll_item_free(u->rtpoll_item);

    if (u->rtpoll)
        pa_rtpoll_free(u->rtpoll);

    if (u->fd >= 0)
        close(u->fd);

    if (u->smoother)
        pa_smoother_free(u->smoother);

    pa_xfree(u->device_name);

    pa_xfree(u);
}

void pa_memblockq_free(pa_memblockq* bq) {
    pa_assert(bq);

    pa_memblockq_silence(bq);

    if (bq->silence.memblock)
        pa_memblock_unref(bq->silence.memblock);

    if (bq->mcalign)
        pa_mcalign_free(bq->mcalign);

    pa_xfree(bq->name);
    pa_xfree(bq);
}

static void connection_free(pa_object *o) {
    connection *c = CONNECTION(o);
    pa_assert(c);

    if (c->playback.current_memblock)
        pa_memblock_unref(c->playback.current_memblock);

    if (c->input_memblockq)
        pa_memblockq_free(c->input_memblockq);
    if (c->output_memblockq)
        pa_memblockq_free(c->output_memblockq);

    pa_xfree(c);
}

void pa_raop_packet_buffer_free(pa_raop_packet_buffer *pb) {
    size_t i;

    pa_assert(pb);

    for (i = 0; pb->packets && i < pb->size; i++) {
        if (pb->packets[i].memblock)
            pa_memblock_unref(pb->packets[i].memblock);
        pa_memchunk_reset(&pb->packets[i]);
    }

    pa_xfree(pb->packets);
    pb->packets = NULL;
    pa_xfree(pb);
}

void pa_raop_packet_buffer_reset(pa_raop_packet_buffer *pb, uint16_t seq) {
    size_t i;

    pa_assert(pb);
    pa_assert(pb->packets);

    pb->pos = 0;
    pb->count = 0;
    pb->seq = (!seq) ? UINT16_MAX : seq - 1;
    for (i = 0; i < pb->size; i++) {
        if (pb->packets[i].memblock)
            pa_memblock_unref(pb->packets[i].memblock);
        pa_memchunk_reset(&pb->packets[i]);
    }
}