/* Called from output thread context */
static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
pa_assert_se(u = o->userdata);
if (!PA_SOURCE_OUTPUT_IS_LINKED(pa_source_output_get_state(u->source_output))) {
pa_log("push when no link?");
return;
}
pa_source_post(u->source, chunk);
}
/* Called from output thread context */
static void source_output_attach_cb(pa_source_output *o) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
pa_assert_se(u = o->userdata);
pa_source_set_rtpoll(u->source, o->source->thread_info.rtpoll);
pa_source_set_latency_range_within_thread(u->source, o->source->thread_info.min_latency, o->source->thread_info.max_latency);
pa_source_set_fixed_latency_within_thread(u->source, o->source->thread_info.fixed_latency);
pa_source_set_max_rewind_within_thread(u->source, pa_source_output_get_max_rewind(o));
pa_source_attach_within_thread(u->source);
}
/* Called from thread context */
pa_usec_t pa_source_output_set_requested_latency_within_thread(pa_source_output *o, pa_usec_t usec) {
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
if (!(o->source->flags & PA_SOURCE_DYNAMIC_LATENCY))
usec = o->source->thread_info.fixed_latency;
if (usec != (pa_usec_t) -1)
usec = PA_CLAMP(usec, o->source->thread_info.min_latency, o->source->thread_info.max_latency);
o->thread_info.requested_source_latency = usec;
pa_source_invalidate_requested_latency(o->source, TRUE);
return usec;
}
/* Called from output thread context */
static void source_output_state_change_cb(pa_source_output *o, pa_source_output_state_t state) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
pa_assert_se(u = o->userdata);
if (PA_SOURCE_OUTPUT_IS_LINKED(state) && o->thread_info.state == PA_SOURCE_OUTPUT_INIT) {
u->skip = pa_usec_to_bytes(PA_CLIP_SUB(pa_source_get_latency_within_thread(o->source),
u->latency),
&o->sample_spec);
pa_log_info("Skipping %lu bytes", (unsigned long) u->skip);
}
}
/* Called from input thread context */
static void source_output_push_cb(pa_source_output *o, const pa_memchunk *chunk) {
struct userdata *u;
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
pa_assert_se(u = o->userdata);
if (!PA_SOURCE_OUTPUT_IS_LINKED(pa_source_output_get_state(u->source_output))) {
pa_log("push when no link?");
return;
}
/* PUT YOUR CODE HERE TO DO SOMETHING WITH THE SOURCE DATA */
/* if uplink sink exists, pull data from there; simplify by using
same length as chunk provided by source */
if(u->sink && (pa_sink_get_state(u->sink) == PA_SINK_RUNNING)) {
pa_memchunk tchunk;
size_t nbytes = chunk->length;
pa_mix_info streams[2];
pa_memchunk target_chunk;
void *target;
int ch;
/* Hmm, process any rewind request that might be queued up */
pa_sink_process_rewind(u->sink, 0);
/* get data from the sink */
while (pa_memblockq_peek(u->sink_memblockq, &tchunk) < 0) {
pa_memchunk nchunk;
/* make sure we get nbytes from the sink with render_full,
otherwise we cannot mix with the uplink */
pa_sink_render_full(u->sink, nbytes, &nchunk);
pa_memblockq_push(u->sink_memblockq, &nchunk);
pa_memblock_unref(nchunk.memblock);
}
pa_assert(tchunk.length == chunk->length);
/* move the read pointer for sink memblockq */
pa_memblockq_drop(u->sink_memblockq, tchunk.length);
/* allocate target chunk */
/* this could probably be done in-place, but having chunk as both
the input and output creates issues with reference counts */
target_chunk.index = 0;
target_chunk.length = chunk->length;
pa_assert(target_chunk.length == chunk->length);
target_chunk.memblock = pa_memblock_new(o->source->core->mempool,
target_chunk.length);
pa_assert( target_chunk.memblock );
/* get target pointer */
target = (void*)((uint8_t*)pa_memblock_acquire(target_chunk.memblock)
+ target_chunk.index);
/* set-up mixing structure
volume was taken care of in sink and source already */
streams[0].chunk = *chunk;
for(ch=0;ch<o->sample_spec.channels;ch++)
streams[0].volume.values[ch] = PA_VOLUME_NORM; /* FIXME */
streams[0].volume.channels = o->sample_spec.channels;
streams[1].chunk = tchunk;
for(ch=0;ch<o->sample_spec.channels;ch++)
streams[1].volume.values[ch] = PA_VOLUME_NORM; /* FIXME */
streams[1].volume.channels = o->sample_spec.channels;
/* do mixing */
pa_mix(streams, /* 2 streams to be mixed */
2,
target, /* put result in target chunk */
chunk->length, /* same length as input */
(const pa_sample_spec *)&o->sample_spec, /* same sample spec for input and output */
NULL, /* no volume information */
FALSE); /* no mute */
pa_memblock_release(target_chunk.memblock);
pa_memblock_unref(tchunk.memblock); /* clean-up */
/* forward the data to the virtual source */
pa_source_post(u->source, &target_chunk);
pa_memblock_unref(target_chunk.memblock); /* clean-up */
} else {
/* forward the data to the virtual source */
pa_source_post(u->source, chunk);
}
}
/* Called from thread context */
size_t pa_source_output_get_max_rewind(pa_source_output *o) {
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
return o->thread_info.resampler ? pa_resampler_request(o->thread_info.resampler, o->source->thread_info.max_rewind) : o->source->thread_info.max_rewind;
}
/* Called from thread context */
void pa_source_output_push(pa_source_output *o, const pa_memchunk *chunk) {
size_t length;
size_t limit, mbs = 0;
pa_source_output_assert_ref(o);
pa_source_output_assert_io_context(o);
pa_assert(PA_SOURCE_OUTPUT_IS_LINKED(o->thread_info.state));
pa_assert(chunk);
pa_assert(pa_frame_aligned(chunk->length, &o->source->sample_spec));
if (!o->push || o->thread_info.state == PA_SOURCE_OUTPUT_CORKED)
return;
pa_assert(o->thread_info.state == PA_SOURCE_OUTPUT_RUNNING);
if (pa_memblockq_push(o->thread_info.delay_memblockq, chunk) < 0) {
pa_log_debug("Delay queue overflow!");
pa_memblockq_seek(o->thread_info.delay_memblockq, (int64_t) chunk->length, PA_SEEK_RELATIVE, TRUE);
}
limit = o->process_rewind ? 0 : o->source->thread_info.max_rewind;
if (limit > 0 && o->source->monitor_of) {
pa_usec_t latency;
size_t n;
/* Hmm, check the latency for knowing how much of the buffered
* data is actually still unplayed and might hence still
* change. This is suboptimal. Ideally we'd have a call like
* pa_sink_get_changeable_size() or so that tells us how much
* of the queued data is actually still changeable. Hence
* FIXME! */
latency = pa_sink_get_latency_within_thread(o->source->monitor_of);
n = pa_usec_to_bytes(latency, &o->source->sample_spec);
if (n < limit)
limit = n;
}
/* Implement the delay queue */
while ((length = pa_memblockq_get_length(o->thread_info.delay_memblockq)) > limit) {
pa_memchunk qchunk;
length -= limit;
pa_assert_se(pa_memblockq_peek(o->thread_info.delay_memblockq, &qchunk) >= 0);
if (qchunk.length > length)
qchunk.length = length;
pa_assert(qchunk.length > 0);
if (!o->thread_info.resampler)
o->push(o, &qchunk);
else {
pa_memchunk rchunk;
if (mbs == 0)
mbs = pa_resampler_max_block_size(o->thread_info.resampler);
if (qchunk.length > mbs)
qchunk.length = mbs;
pa_resampler_run(o->thread_info.resampler, &qchunk, &rchunk);
if (rchunk.length > 0)
o->push(o, &rchunk);
if (rchunk.memblock)
pa_memblock_unref(rchunk.memblock);
}
pa_memblock_unref(qchunk.memblock);
pa_memblockq_drop(o->thread_info.delay_memblockq, qchunk.length);
}
}
