/* Called from thread context */
static int sink_input_pop_cb(pa_sink_input *i, size_t length, pa_memchunk *chunk) {
connection *c;
pa_sink_input_assert_ref(i);
c = CONNECTION(i->userdata);
connection_assert_ref(c);
pa_assert(chunk);
if (pa_memblockq_peek(c->input_memblockq, chunk) < 0) {
c->playback.underrun = true;
if (c->dead && pa_sink_input_safe_to_remove(i))
pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(c), CONNECTION_MESSAGE_UNLINK_CONNECTION, NULL, 0, NULL, NULL);
return -1;
} else {
size_t m;
chunk->length = PA_MIN(length, chunk->length);
c->playback.underrun = false;
pa_memblockq_drop(c->input_memblockq, chunk->length);
m = pa_memblockq_pop_missing(c->input_memblockq);
if (m > 0)
if (pa_atomic_add(&c->playback.missing, (int) m) <= 0)
pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(c), CONNECTION_MESSAGE_REQUEST_DATA, NULL, 0, NULL, NULL);
return 0;
}
}
static int connection_process_msg(pa_msgobject *o, int code, void*userdata, int64_t offset, pa_memchunk *chunk) {
connection *c = CONNECTION(o);
connection_assert_ref(c);
if (!c->protocol)
return -1;
switch (code) {
case CONNECTION_MESSAGE_REQUEST_DATA:
do_work(c);
break;
case CONNECTION_MESSAGE_POST_DATA:
/* pa_log("got data %u", chunk->length); */
pa_memblockq_push_align(c->output_memblockq, chunk);
do_work(c);
break;
case CONNECTION_MESSAGE_UNLINK_CONNECTION:
connection_unlink(c);
break;
}
return 0;
}
static int do_write(connection *c) {
pa_memchunk chunk;
ssize_t r;
void *p;
connection_assert_ref(c);
if (!c->source_output)
return 0;
if (pa_memblockq_peek(c->output_memblockq, &chunk) < 0) {
/* pa_log("peek failed"); */
return 0;
}
pa_assert(chunk.memblock);
pa_assert(chunk.length);
p = pa_memblock_acquire(chunk.memblock);
r = pa_iochannel_write(c->io, (uint8_t*) p+chunk.index, chunk.length);
pa_memblock_release(chunk.memblock);
pa_memblock_unref(chunk.memblock);
if (r < 0) {
pa_log("write(): %s", pa_cstrerror(errno));
return -1;
}
pa_memblockq_drop(c->output_memblockq, (size_t) r);
return 1;
}
static void do_work(connection *c) {
connection_assert_ref(c);
if (c->dead)
return;
if (pa_iochannel_is_readable(c->io))
if (do_read(c) < 0)
goto fail;
if (!c->sink_input && pa_iochannel_is_hungup(c->io))
goto fail;
if (pa_iochannel_is_writable(c->io))
if (do_write(c) < 0)
goto fail;
return;
fail:
if (c->sink_input) {
/* If there is a sink input, we first drain what we already have read before shutting down the connection */
c->dead = TRUE;
pa_iochannel_free(c->io);
c->io = NULL;
pa_asyncmsgq_post(c->sink_input->sink->asyncmsgq, PA_MSGOBJECT(c->sink_input), SINK_INPUT_MESSAGE_DISABLE_PREBUF, NULL, 0, NULL, NULL);
} else
connection_unlink(c);
}
static void io_callback(pa_iochannel*io, void *userdata) {
connection *c = CONNECTION(userdata);
connection_assert_ref(c);
pa_assert(io);
do_work(c);
}
/* Called from thread context */
static void sink_input_update_max_rewind_cb(pa_sink_input *i, size_t nbytes) {
connection *c;
pa_sink_input_assert_ref(i);
c = CONNECTION(i->userdata);
connection_assert_ref(c);
pa_memblockq_set_maxrewind(c->input_memblockq, nbytes);
}
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;
}
/* Called from thread context */
static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
connection *c;
pa_sink_input_assert_ref(i);
c = CONNECTION(i->userdata);
connection_assert_ref(c);
/* If we are in an underrun, then we don't rewind */
if (i->thread_info.underrun_for > 0)
return;
pa_memblockq_rewind(c->input_memblockq, nbytes);
}
/* Called from thread context */
static int sink_input_process_msg(pa_msgobject *o, int code, void *userdata, int64_t offset, pa_memchunk *chunk) {
pa_sink_input *i = PA_SINK_INPUT(o);
connection*c;
pa_sink_input_assert_ref(i);
c = CONNECTION(i->userdata);
connection_assert_ref(c);
switch (code) {
case SINK_INPUT_MESSAGE_POST_DATA: {
pa_assert(chunk);
/* New data from the main loop */
pa_memblockq_push_align(c->input_memblockq, chunk);
if (pa_memblockq_is_readable(c->input_memblockq) && c->playback.underrun) {
pa_log_debug("Requesting rewind due to end of underrun.");
pa_sink_input_request_rewind(c->sink_input, 0, false, true, false);
}
/* pa_log("got data, %u", pa_memblockq_get_length(c->input_memblockq)); */
return 0;
}
case SINK_INPUT_MESSAGE_DISABLE_PREBUF:
pa_memblockq_prebuf_disable(c->input_memblockq);
return 0;
case PA_SINK_INPUT_MESSAGE_GET_LATENCY: {
pa_usec_t *r = userdata;
*r = pa_bytes_to_usec(pa_memblockq_get_length(c->input_memblockq), &c->sink_input->sample_spec);
/* Fall through, the default handler will add in the extra
* latency added by the resampler */
}
default:
return pa_sink_input_process_msg(o, code, userdata, offset, chunk);
}
}
