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gst: don't do set_caps from the pipewire callback

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Don't do any GStreamer data transport from the PipeWire callback
because it might block in preroll and block our communication with
PipeWire. Instead, take the caps and wake up the caller to continue
with negotiation.
This commit is contained in:
Wim Taymans 2020-08-06 13:03:40 +02:00
parent 34334b6ea3
commit 98b7dc7c0c
2 changed files with 25 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

39
src/gst/gstpipewiresrc.c
View file

@ -60,7 +60,7 @@ GST_DEBUG_CATEGORY_STATIC (pipewire_src_debug);
#define GST_CAT_DEFAULT pipewire_src_debug
#define DEFAULT_ALWAYS_COPY false
#define DEFAULT_MIN_BUFFERS 1
#define DEFAULT_MIN_BUFFERS 8
#define DEFAULT_MAX_BUFFERS INT32_MAX
#define DEFAULT_RESEND_LAST false
#define DEFAULT_KEEPALIVE_TIME 0
@ -561,6 +561,7 @@ static gboolean
gst_pipewire_src_stream_start (GstPipeWireSrc *pwsrc)
{
const char *error = NULL;
pw_thread_loop_lock (pwsrc->core->loop);
GST_DEBUG_OBJECT (pwsrc, "doing stream start");
while (TRUE) {
@ -593,7 +594,7 @@ start_error:
}
static enum pw_stream_state
wait_negotiated (GstPipeWireSrc *this)
wait_started (GstPipeWireSrc *this)
{
enum pw_stream_state state;
const char *error = NULL;
@ -693,9 +694,8 @@ gst_pipewire_src_negotiate (GstBaseSrc * basesrc)
while (TRUE) {
enum pw_stream_state state = pw_stream_get_state (pwsrc->stream, &error);
GST_DEBUG_OBJECT (basesrc, "waiting for PAUSED, now %s", pw_stream_state_as_string (state));
if (state == PW_STREAM_STATE_PAUSED ||
state == PW_STREAM_STATE_STREAMING)
GST_DEBUG_OBJECT (basesrc, "waiting for NEGOTIATED, now %s", pw_stream_state_as_string (state));
if (pwsrc->negotiated)
break;
if (state == PW_STREAM_STATE_ERROR)
@ -703,11 +703,19 @@ gst_pipewire_src_negotiate (GstBaseSrc * basesrc)
pw_thread_loop_wait (pwsrc->core->loop);
}
caps = pwsrc->caps;
pwsrc->caps = NULL;
pw_thread_loop_unlock (pwsrc->core->loop);
gst_pipewire_clock_reset (GST_PIPEWIRE_CLOCK (pwsrc->clock), 0);
GST_DEBUG_OBJECT (pwsrc, "set format %" GST_PTR_FORMAT, caps);
result = gst_base_src_set_caps (GST_BASE_SRC (pwsrc), caps);
gst_caps_unref (caps);
result = gst_pipewire_src_stream_start (pwsrc);
pwsrc->negotiated = result;
pwsrc->started = result;
return result;
@ -748,22 +756,19 @@ on_param_changed (void *data, uint32_t id,
const struct spa_pod *param)
{
GstPipeWireSrc *pwsrc = data;
GstCaps *caps;
gboolean res;
if (param == NULL || id != SPA_PARAM_Format) {
GST_DEBUG_OBJECT (pwsrc, "clear format");
return;
}
if (pwsrc->caps)
gst_caps_unref(pwsrc->caps);
pwsrc->caps = gst_caps_from_format (param);
GST_DEBUG_OBJECT (pwsrc, "we got format %" GST_PTR_FORMAT, pwsrc->caps);
gst_pipewire_clock_reset (GST_PIPEWIRE_CLOCK (pwsrc->clock), 0);
pwsrc->negotiated = pwsrc->caps != NULL;
caps = gst_caps_from_format (param);
GST_DEBUG_OBJECT (pwsrc, "we got format %" GST_PTR_FORMAT, caps);
res = gst_base_src_set_caps (GST_BASE_SRC (pwsrc), caps);
gst_caps_unref (caps);
if (res) {
if (pwsrc->negotiated) {
const struct spa_pod *params[3];
struct spa_pod_builder b = { NULL };
uint8_t buffer[512];
@ -795,6 +800,7 @@ on_param_changed (void *data, uint32_t id,
GST_WARNING_OBJECT (pwsrc, "finish format with error");
pw_stream_set_error (pwsrc->stream, -EINVAL, "unhandled format");
}
pw_thread_loop_signal (pwsrc->core->loop, FALSE);
}
static gboolean
@ -1021,6 +1027,7 @@ gst_pipewire_src_stop (GstBaseSrc * basesrc)
pw_thread_loop_lock (pwsrc->core->loop);
pwsrc->eos = false;
gst_buffer_replace (&pwsrc->last_buffer, NULL);
gst_caps_replace(&pwsrc->caps, NULL);
pw_thread_loop_unlock (pwsrc->core->loop);
return TRUE;
@ -1179,7 +1186,7 @@ gst_pipewire_src_change_state (GstElement * element, GstStateChange transition)
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
if (wait_negotiated (this) == PW_STREAM_STATE_ERROR)
if (wait_started (this) == PW_STREAM_STATE_ERROR)
goto open_failed;
if (gst_base_src_is_live (GST_BASE_SRC (element)))

2
src/gst/gstpipewiresrc.h
View file

@ -68,6 +68,8 @@ struct _GstPipeWireSrc {
gboolean resend_last;
gint keepalive_time;
GstCaps *caps;
gboolean negotiated;
gboolean flushing;
gboolean started;