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Fighting rewinds: Reduce calls to handle_seek

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If many small blocks are in queue, handle_seek is being called
for every one of them, sometimes causing a rewind. Delay the
call until all blocks are handled, then call handle_seek only
once.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
This commit is contained in:
David Henningsson 2010-12-09 11:08:37 +01:00 • committed by Colin Guthrie
parent fe7b972487
commit 74eb4d8921
1 changed files with 26 additions and 30 deletions
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46
src/pulsecore/protocol-native.c
View file

@ -125,6 +125,10 @@ typedef struct playback_stream {
uint32_t drain_tag;
uint32_t syncid;
/* Optimization to avoid too many rewinds with a lot of small blocks */
pa_atomic_t seek_or_post_in_queue;
int64_t seek_windex;
pa_atomic_t missing;
pa_usec_t configured_sink_latency;
pa_buffer_attr buffer_attr;
@ -1100,6 +1104,8 @@ static playback_stream* playback_stream_new(
s->buffer_attr = *a;
s->adjust_latency = adjust_latency;
s->early_requests = early_requests;
pa_atomic_store(&s->seek_or_post_in_queue, 0);
s->seek_windex = -1;
s->sink_input->parent.process_msg = sink_input_process_msg;
s->sink_input->pop = sink_input_pop_cb;
@ -1352,7 +1358,6 @@ static void flush_write_no_account(pa_memblockq *q) {
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);
playback_stream *s;
int64_t windex_seek = 0;
pa_sink_input_assert_ref(i);
s = PLAYBACK_STREAM(i->userdata);
@ -1360,45 +1365,35 @@ static int sink_input_process_msg(pa_msgobject *o, int code, void *userdata, int
switch (code) {
case SINK_INPUT_MESSAGE_SEEK: {
windex_seek = pa_memblockq_get_write_index(s->memblockq);
case SINK_INPUT_MESSAGE_SEEK:
case SINK_INPUT_MESSAGE_POST_DATA: {
int64_t windex = pa_memblockq_get_write_index(s->memblockq);
if (code == SINK_INPUT_MESSAGE_SEEK) {
/* The client side is incapable of accounting correctly
* for seeks of a type != PA_SEEK_RELATIVE. We need to be
* able to deal with that. */
pa_memblockq_seek(s->memblockq, offset, PA_PTR_TO_UINT(userdata), PA_PTR_TO_UINT(userdata) == PA_SEEK_RELATIVE);
if (!chunk) {
handle_seek(s, windex_seek);
return 0;
}
/* else fall through and write some data */
windex = PA_MIN(windex, pa_memblockq_get_write_index(s->memblockq));
}
case SINK_INPUT_MESSAGE_POST_DATA: {
int64_t windex;
pa_assert(chunk);
windex = pa_memblockq_get_write_index(s->memblockq);
if (code == SINK_INPUT_MESSAGE_SEEK)
windex = PA_MIN(windex, windex_seek);
/* pa_log("sink input post: %lu %lli", (unsigned long) chunk->length, (long long) windex); */
if (pa_memblockq_push_align(s->memblockq, chunk) < 0) {
if (chunk && pa_memblockq_push_align(s->memblockq, chunk) < 0) {
if (pa_log_ratelimit(PA_LOG_WARN))
pa_log_warn("Failed to push data into queue");
pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(s), PLAYBACK_STREAM_MESSAGE_OVERFLOW, NULL, 0, NULL, NULL);
pa_memblockq_seek(s->memblockq, (int64_t) chunk->length, PA_SEEK_RELATIVE, TRUE);
}
/* If more data is in queue, we rewind later instead. */
if (s->seek_windex != -1)
windex = PA_MIN(windex, s->seek_windex);
if (pa_atomic_dec(&s->seek_or_post_in_queue) > 1)
s->seek_windex = windex;
else {
s->seek_windex = -1;
handle_seek(s, windex);
/* pa_log("sink input post2: %lu", (unsigned long) pa_memblockq_get_length(s->memblockq)); */
}
return 0;
}
@ -4468,6 +4463,7 @@ static void pstream_memblock_callback(pa_pstream *p, uint32_t channel, int64_t o
if (playback_stream_isinstance(stream)) {
playback_stream *ps = PLAYBACK_STREAM(stream);
pa_atomic_inc(&ps->seek_or_post_in_queue);
if (chunk->memblock) {
if (seek != PA_SEEK_RELATIVE || offset != 0)
pa_asyncmsgq_post(ps->sink_input->sink->asyncmsgq, PA_MSGOBJECT(ps->sink_input), SINK_INPUT_MESSAGE_SEEK, PA_UINT_TO_PTR(seek), offset, chunk, NULL);