[pulseaudio-discuss] [PATCH v8] pipe-source: implement autosuspend option
Raman Shyshniou
rommer at ibuffed.com
Tue Feb 20 15:38:20 UTC 2018
Currently the pipe-source will remain running even if no
writer is connected and therefore no data is produced.
This patch adds the autosuspend=<bool> option to prevent this.
Source will stay suspended if no writer is connected.
This option is enabled by default.
---
src/modules/module-pipe-source.c | 279 +++++++++++++++++++++++++++++----------
1 file changed, 212 insertions(+), 67 deletions(-)
diff --git a/src/modules/module-pipe-source.c b/src/modules/module-pipe-source.c
index f8284c1..359cdbf 100644
--- a/src/modules/module-pipe-source.c
+++ b/src/modules/module-pipe-source.c
@@ -33,6 +33,7 @@
#include <sys/filio.h>
#endif
+#include <pulse/rtclock.h>
#include <pulse/xmalloc.h>
#include <pulsecore/core-error.h>
@@ -57,11 +58,24 @@ PA_MODULE_USAGE(
"format=<sample format> "
"rate=<sample rate> "
"channels=<number of channels> "
- "channel_map=<channel map>");
+ "channel_map=<channel map> "
+ "autosuspend=<boolean>");
#define DEFAULT_FILE_NAME "/tmp/music.input"
#define DEFAULT_SOURCE_NAME "fifo_input"
+struct pipe_source_msg {
+ pa_msgobject parent;
+};
+
+typedef struct pipe_source_msg pipe_source_msg;
+PA_DEFINE_PRIVATE_CLASS(pipe_source_msg, pa_msgobject);
+
+enum {
+ PIPE_SOURCE_SUSPEND,
+ PIPE_SOURCE_RESUME
+};
+
struct userdata {
pa_core *core;
pa_module *module;
@@ -71,12 +85,14 @@ struct userdata {
pa_thread_mq thread_mq;
pa_rtpoll *rtpoll;
+ pipe_source_msg *msg;
+ pa_usec_t timestamp;
+ bool autosuspend;
+ size_t pipe_size;
+
char *filename;
+ int corkfd;
int fd;
-
- pa_memchunk memchunk;
-
- pa_rtpoll_item *rtpoll_item;
};
static const char* const valid_modargs[] = {
@@ -87,9 +103,41 @@ static const char* const valid_modargs[] = {
"rate",
"channels",
"channel_map",
+ "autosuspend",
NULL
};
+/* Called from main context */
+static int pipe_source_process_msg(
+ pa_msgobject *o,
+ int code,
+ void *data,
+ int64_t offset,
+ pa_memchunk *chunk) {
+
+ struct userdata *u = (struct userdata *) data;
+
+ pa_assert(u);
+
+ switch (code) {
+ case PIPE_SOURCE_SUSPEND:
+ pa_log_debug("Suspending source %s because no writers left", u->source->name);
+ pa_source_suspend(u->source, true, PA_SUSPEND_APPLICATION);
+ break;
+
+ case PIPE_SOURCE_RESUME:
+ pa_log_debug("Resuming source %s", u->source->name);
+ pa_source_suspend(u->source, false, PA_SUSPEND_APPLICATION);
+ break;
+
+ default:
+ pa_assert_not_reached();
+ }
+
+ return 0;
+}
+
+/* Called from thread context */
static int source_process_msg(
pa_msgobject *o,
int code,
@@ -101,17 +149,19 @@ static int source_process_msg(
switch (code) {
- case PA_SOURCE_MESSAGE_GET_LATENCY: {
- size_t n = 0;
+ case PA_SOURCE_MESSAGE_SET_STATE:
-#ifdef FIONREAD
- int l;
+ if (u->source->thread_info.state == PA_SOURCE_SUSPENDED || u->source->thread_info.state == PA_SOURCE_INIT) {
+ if (PA_SOURCE_IS_OPENED(PA_PTR_TO_UINT(data)))
+ u->timestamp = pa_rtclock_now();
+ }
- if (ioctl(u->fd, FIONREAD, &l) >= 0 && l > 0)
- n = (size_t) l;
-#endif
+ break;
+
+ case PA_SOURCE_MESSAGE_GET_LATENCY: {
+
+ *((int64_t*) data) = PA_CLIP_SUB((int64_t)pa_rtclock_now(), (int64_t)u->timestamp);
- *((int64_t*) data) = pa_bytes_to_usec(n, &u->source->sample_spec);
return 0;
}
}
@@ -121,7 +171,11 @@ static int source_process_msg(
static void thread_func(void *userdata) {
struct userdata *u = userdata;
+ pa_rtpoll_item *rtpoll_item;
+ struct pollfd *pollfd;
+ pa_memchunk chunk;
int read_type = 0;
+ size_t fs;
pa_assert(u);
@@ -129,68 +183,140 @@ static void thread_func(void *userdata) {
pa_thread_mq_install(&u->thread_mq);
+ fs = pa_frame_size(&u->source->sample_spec);
+
+ pa_memchunk_reset(&chunk);
+ chunk.memblock = pa_memblock_new(u->core->mempool, u->pipe_size);
+
+ rtpoll_item = NULL;
+ pollfd = NULL;
+
+ u->timestamp = pa_rtclock_now();
+
+ /* Close our writer here to suspend source if no writers left */
+ pa_assert_se(pa_close(u->corkfd) == 0);
+ u->corkfd = -1;
+
for (;;) {
int ret;
- struct pollfd *pollfd;
- pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+ if (chunk.length) {
+ /* We have a pending data, let's stop polling pipe.
+ * Setting up pollfd->events = 0 is not enough to stop
+ * POLLHUP spam if all writers are closed pipe.
+ * We need to stop polling pipe completely */
+ if (rtpoll_item) {
+ pa_rtpoll_item_free(rtpoll_item);
+ rtpoll_item = NULL;
+ }
+ } else {
+ /* We have no pending data, let's start polling pipe */
+ if (rtpoll_item == NULL) {
+ rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
+ pollfd = pa_rtpoll_item_get_pollfd(rtpoll_item, NULL);
+ pollfd->events = POLLIN;
+ pollfd->fd = u->fd;
+ }
+ }
- /* Try to read some data and pass it on to the source driver */
- if (u->source->thread_info.state == PA_SOURCE_RUNNING && pollfd->revents) {
- ssize_t l;
- void *p;
+ if ((ret = pa_rtpoll_run(u->rtpoll)) < 0)
+ goto fail;
- if (!u->memchunk.memblock) {
- u->memchunk.memblock = pa_memblock_new(u->core->mempool, pa_pipe_buf(u->fd));
- u->memchunk.index = u->memchunk.length = 0;
- }
+ if (ret == 0)
+ goto finish;
- pa_assert(pa_memblock_get_length(u->memchunk.memblock) > u->memchunk.index);
+ if (rtpoll_item) {
+ pollfd = pa_rtpoll_item_get_pollfd(rtpoll_item, NULL);
- p = pa_memblock_acquire(u->memchunk.memblock);
- l = pa_read(u->fd, (uint8_t*) p + u->memchunk.index, pa_memblock_get_length(u->memchunk.memblock) - u->memchunk.index, &read_type);
- pa_memblock_release(u->memchunk.memblock);
+ if (pollfd->revents & ~(POLLIN|POLLHUP)) {
+ pa_log("FD error: %s%s%s%s",
+ pollfd->revents & POLLOUT ? "POLLOUT " : "",
+ pollfd->revents & POLLERR ? "POLLERR " : "",
+ pollfd->revents & POLLPRI ? "POLLPRI " : "",
+ pollfd->revents & POLLNVAL ? "POLLNVAL " : "");
- pa_assert(l != 0); /* EOF cannot happen, since we opened the fifo for both reading and writing */
+ goto fail;
+ }
+ } else
+ pollfd = NULL;
- if (l < 0) {
+ /* Try to read some data if there are any events */
+ if (pollfd && pollfd->revents) {
+ ssize_t l;
+ void *p;
- if (errno == EINTR)
- continue;
- else if (errno != EAGAIN) {
- pa_log("Failed to read data from FIFO: %s", pa_cstrerror(errno));
- goto fail;
- }
+ pa_assert(chunk.index < fs);
- } else {
+ p = pa_memblock_acquire(chunk.memblock);
+ l = pa_read(u->fd, (uint8_t *) p + chunk.index, pa_memblock_get_length(chunk.memblock) - chunk.index, &read_type);
+ pa_memblock_release(chunk.memblock);
- u->memchunk.length = (size_t) l;
- pa_source_post(u->source, &u->memchunk);
- u->memchunk.index += (size_t) l;
+ if (l > 0) {
+ chunk.length = (size_t) l;
+ u->timestamp = pa_rtclock_now();
- if (u->memchunk.index >= pa_memblock_get_length(u->memchunk.memblock)) {
- pa_memblock_unref(u->memchunk.memblock);
- pa_memchunk_reset(&u->memchunk);
+ if (u->corkfd >= 0) {
+ if (u->autosuspend)
+ pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(u->msg), PIPE_SOURCE_RESUME, u, 0, NULL, NULL);
+
+ pa_assert_se(pa_close(u->corkfd) == 0);
+ u->corkfd = -1;
+ }
+ } else if (l == 0) {
+ /* Writer was disconnected: discard unalligned data tail */
+ chunk.index = 0;
+
+ if (u->corkfd < 0) {
+ if (u->autosuspend)
+ pa_asyncmsgq_post(pa_thread_mq_get()->outq, PA_MSGOBJECT(u->msg), PIPE_SOURCE_SUSPEND, u, 0, NULL, NULL);
+
+ if ((u->corkfd = pa_open_cloexec(u->filename, O_WRONLY, 0)) < 0) {
+ pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
+ goto fail;
+ }
}
+ } else {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
- pollfd->revents = 0;
+ pa_log("Failed to read data from FIFO: %s", pa_cstrerror(errno));
+ goto fail;
}
}
- /* Hmm, nothing to do. Let's sleep */
- pollfd->events = (short) (u->source->thread_info.state == PA_SOURCE_RUNNING ? POLLIN : 0);
+ /* Post pending data.
+ * Let's keep frame boundaries */
+ if (PA_SOURCE_IS_OPENED(u->source->thread_info.state)) {
+ size_t total_len = chunk.index + chunk.length;
+ size_t frames = total_len / fs;
+ size_t tail = total_len % fs;
- if ((ret = pa_rtpoll_run(u->rtpoll)) < 0)
- goto fail;
+ if (frames > 0) {
+ pa_memblock *memblock;
- if (ret == 0)
- goto finish;
+ memblock = pa_memblock_new(u->core->mempool, u->pipe_size);
+ chunk.length = frames * fs;
+ chunk.index = 0;
- pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+ if (tail) {
+ void *src, *dst;
- if (pollfd->revents & ~POLLIN) {
- pa_log("FIFO shutdown.");
- goto fail;
+ dst = pa_memblock_acquire(memblock);
+ src = pa_memblock_acquire(chunk.memblock);
+
+ memcpy(dst, (uint8_t *) src + chunk.length, tail);
+
+ pa_memblock_release(chunk.memblock);
+ pa_memblock_release(memblock);
+ }
+
+ pa_source_post(u->source, &chunk);
+ pa_memblock_unref(chunk.memblock);
+ chunk.memblock = memblock;
+ }
+
+ chunk.index = tail;
+ chunk.length = 0;
}
}
@@ -201,6 +327,11 @@ fail:
pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
finish:
+ if (rtpoll_item)
+ pa_rtpoll_item_free(rtpoll_item);
+
+ pa_memblock_unref(chunk.memblock);
+
pa_log_debug("Thread shutting down");
}
@@ -210,7 +341,6 @@ int pa__init(pa_module *m) {
pa_sample_spec ss;
pa_channel_map map;
pa_modargs *ma;
- struct pollfd *pollfd;
pa_source_new_data data;
pa_assert(m);
@@ -230,7 +360,6 @@ int pa__init(pa_module *m) {
m->userdata = u = pa_xnew0(struct userdata, 1);
u->core = m->core;
u->module = m;
- pa_memchunk_reset(&u->memchunk);
u->rtpoll = pa_rtpoll_new();
if (pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll) < 0) {
@@ -238,13 +367,31 @@ int pa__init(pa_module *m) {
goto fail;
}
+ if (!(u->msg = pa_msgobject_new(pipe_source_msg)))
+ goto fail;
+
+ u->msg->parent.process_msg = pipe_source_process_msg;
+
+ u->autosuspend = true;
+
+ if (pa_modargs_get_value_boolean(ma, "autosuspend", &u->autosuspend) < 0) {
+ pa_log("Failed to parse autosuspend argument.");
+ goto fail;
+ }
+
u->filename = pa_runtime_path(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
if (mkfifo(u->filename, 0666) < 0) {
pa_log("mkfifo('%s'): %s", u->filename, pa_cstrerror(errno));
goto fail;
}
- if ((u->fd = pa_open_cloexec(u->filename, O_RDWR, 0)) < 0) {
+
+ if ((u->corkfd = pa_open_cloexec(u->filename, O_RDWR, 0)) < 0) {
+ pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
+ goto fail;
+ }
+
+ if ((u->fd = pa_open_cloexec(u->filename, O_RDONLY, 0)) < 0) {
pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
goto fail;
}
@@ -289,12 +436,10 @@ int pa__init(pa_module *m) {
pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
pa_source_set_rtpoll(u->source, u->rtpoll);
- pa_source_set_fixed_latency(u->source, pa_bytes_to_usec(pa_pipe_buf(u->fd), &u->source->sample_spec));
- u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
- pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
- pollfd->fd = u->fd;
- pollfd->events = pollfd->revents = 0;
+ u->pipe_size = pa_pipe_buf(u->fd);
+ u->pipe_size = PA_MIN(pa_mempool_block_size_max(u->core->mempool), u->pipe_size);
+ pa_source_set_fixed_latency(u->source, pa_bytes_to_usec(u->pipe_size, &u->source->sample_spec));
if (!(u->thread = pa_thread_new("pipe-source", thread_func, u))) {
pa_log("Failed to create thread.");
@@ -346,12 +491,6 @@ void pa__done(pa_module *m) {
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);
@@ -360,6 +499,12 @@ void pa__done(pa_module *m) {
pa_xfree(u->filename);
}
+ if (u->msg)
+ pa_xfree(u->msg);
+
+ if (u->corkfd >= 0)
+ pa_assert_se(pa_close(u->corkfd) == 0);
+
if (u->fd >= 0)
pa_assert_se(pa_close(u->fd) == 0);
--
1.8.3.1
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