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synced 2024-11-18 07:47:17 +00:00
souphttpsrc: reduce reading latency by using non-blocking read
Non-blocking read will return the amount of data available without blocking to wait for the full requested size. The downside is that now it souphttpsrc needs to have a waiting mechanism in case there is no data available yet to avoid busy looping arond the inputstream.
This commit is contained in:
Thiago Santos
parent
fe34f46f32
commit
8816764112
2 changed files with 103 additions and 16 deletions
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@ -77,6 +77,7 @@
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#endif
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#include <gst/gstelement.h>
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#include <gst/gst-i18n-plugin.h>
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#include <gio/gio.h>
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#include <libsoup/soup.h>
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#include "gstsouphttpsrc.h"
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#include "gstsouputils.h"
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@ -175,6 +176,7 @@ static void gst_soup_http_src_got_headers (GstSoupHTTPSrc * src,
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static void gst_soup_http_src_authenticate_cb (SoupSession * session,
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SoupMessage * msg, SoupAuth * auth, gboolean retrying,
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GstSoupHTTPSrc * src);
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static void gst_soup_http_src_destroy_input_stream (GstSoupHTTPSrc * src);
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#define gst_soup_http_src_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstSoupHTTPSrc, gst_soup_http_src, GST_TYPE_PUSH_SRC,
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@ -439,10 +441,7 @@ gst_soup_http_src_reset (GstSoupHTTPSrc * src)
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src->ret = GST_FLOW_OK;
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g_cancellable_reset (src->cancellable);
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if (src->input_stream) {
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g_object_unref (src->input_stream);
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src->input_stream = NULL;
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}
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gst_soup_http_src_destroy_input_stream (src);
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gst_caps_replace (&src->src_caps, NULL);
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g_free (src->iradio_name);
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@ -461,6 +460,7 @@ gst_soup_http_src_init (GstSoupHTTPSrc * src)
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g_mutex_init (&src->mutex);
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g_cond_init (&src->have_headers_cond);
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src->cancellable = g_cancellable_new ();
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src->poll_context = g_main_context_new ();
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src->location = NULL;
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src->redirection_uri = NULL;
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src->automatic_redirect = TRUE;
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@ -515,6 +515,7 @@ gst_soup_http_src_finalize (GObject * gobject)
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g_mutex_clear (&src->mutex);
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g_cond_clear (&src->have_headers_cond);
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g_object_unref (src->cancellable);
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g_main_context_unref (src->poll_context);
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g_free (src->location);
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g_free (src->redirection_uri);
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g_free (src->user_agent);
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@ -764,6 +765,21 @@ gst_soup_http_src_unicodify (const gchar * str)
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return gst_tag_freeform_string_to_utf8 (str, -1, env_vars);
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}
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static void
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gst_soup_http_src_destroy_input_stream (GstSoupHTTPSrc * src)
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{
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if (src->input_stream) {
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if (src->poll_source) {
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g_source_destroy (src->poll_source);
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g_source_unref (src->poll_source);
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src->poll_source = NULL;
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}
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g_input_stream_close (src->input_stream, src->cancellable, NULL);
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g_object_unref (src->input_stream);
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src->input_stream = NULL;
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}
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}
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static void
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gst_soup_http_src_cancel_message (GstSoupHTTPSrc * src)
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{
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@ -1355,11 +1371,25 @@ gst_soup_http_src_build_message (GstSoupHTTPSrc * src, const gchar * method)
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return TRUE;
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}
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static void
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gst_soup_http_src_check_input_stream_interfaces (GstSoupHTTPSrc * src)
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{
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if (!src->input_stream)
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return;
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src->has_pollable_interface = G_IS_POLLABLE_INPUT_STREAM (src->input_stream)
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&& g_pollable_input_stream_can_poll ((GPollableInputStream *)
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src->input_stream);
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}
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static GstFlowReturn
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gst_soup_http_src_send_message (GstSoupHTTPSrc * src)
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{
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g_return_val_if_fail (src->msg != NULL, GST_FLOW_ERROR);
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g_assert (src->input_stream == NULL);
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g_assert (src->poll_source == NULL);
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/* FIXME We are ignoring the GError here, might be useful to debug */
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src->input_stream =
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soup_session_send (src->session, src->msg, src->cancellable, NULL);
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@ -1380,6 +1410,8 @@ gst_soup_http_src_send_message (GstSoupHTTPSrc * src)
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return GST_FLOW_ERROR;
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}
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gst_soup_http_src_check_input_stream_interfaces (src);
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return GST_FLOW_OK;
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}
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@ -1448,6 +1480,38 @@ gst_soup_http_src_update_position (GstSoupHTTPSrc * src, gint64 bytes_read)
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}
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}
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static gboolean
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_gst_soup_http_src_data_available_callback (GObject * pollable_stream,
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gpointer udata)
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{
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GstSoupHTTPSrc *src = udata;
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src->have_data = TRUE;
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return TRUE;
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}
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/* Need to wait on a gsource to know when data is available */
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static gboolean
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gst_soup_http_src_wait_for_data (GstSoupHTTPSrc * src)
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{
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src->have_data = FALSE;
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if (!src->poll_source) {
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src->poll_source =
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g_pollable_input_stream_create_source ((GPollableInputStream *)
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src->input_stream, src->cancellable);
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g_source_set_callback (src->poll_source,
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(GSourceFunc) _gst_soup_http_src_data_available_callback, src, NULL);
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g_source_attach (src->poll_source, src->poll_context);
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}
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while (!src->have_data && !g_cancellable_is_cancelled (src->cancellable)) {
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g_main_context_iteration (src->poll_context, TRUE);
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}
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return src->have_data;
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}
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static GstFlowReturn
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gst_soup_http_src_read_buffer (GstSoupHTTPSrc * src, GstBuffer ** outbuf)
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{
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@ -1455,6 +1519,7 @@ gst_soup_http_src_read_buffer (GstSoupHTTPSrc * src, GstBuffer ** outbuf)
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GstMapInfo mapinfo;
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GstBaseSrc *bsrc;
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GstFlowReturn ret;
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GError *err = NULL;
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bsrc = GST_BASE_SRC_CAST (src);
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@ -1469,9 +1534,34 @@ gst_soup_http_src_read_buffer (GstSoupHTTPSrc * src, GstBuffer ** outbuf)
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return GST_FLOW_ERROR;
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}
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read_bytes =
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g_input_stream_read (src->input_stream, mapinfo.data, mapinfo.size,
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src->cancellable, NULL);
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if (src->has_pollable_interface) {
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while (1) {
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read_bytes =
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g_pollable_input_stream_read_nonblocking ((GPollableInputStream *)
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src->input_stream, mapinfo.data, mapinfo.size, src->cancellable,
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&err);
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if (read_bytes == -1) {
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if (err && g_error_matches (err, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK)) {
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g_error_free (err);
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err = NULL;
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/* no data yet, wait */
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if (gst_soup_http_src_wait_for_data (src))
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/* retry */
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continue;
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}
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}
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break;
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}
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} else {
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read_bytes =
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g_input_stream_read (src->input_stream, mapinfo.data, mapinfo.size,
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src->cancellable, NULL);
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}
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if (err)
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g_error_free (err);
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GST_DEBUG_OBJECT (src, "Read %" G_GSSIZE_FORMAT " bytes from http input",
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read_bytes);
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@ -1518,11 +1608,7 @@ retry:
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/* Check for pending position change */
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if (src->request_position != src->read_position) {
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if (src->input_stream) {
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g_input_stream_close (src->input_stream, src->cancellable, NULL);
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g_object_unref (src->input_stream);
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src->input_stream = NULL;
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}
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gst_soup_http_src_destroy_input_stream (src);
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}
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if (g_cancellable_is_cancelled (src->cancellable)) {
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@ -1559,10 +1645,7 @@ done:
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gst_event_unref (http_headers_event);
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g_mutex_lock (&src->mutex);
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if (src->input_stream) {
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g_object_unref (src->input_stream);
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src->input_stream = NULL;
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}
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gst_soup_http_src_destroy_input_stream (src);
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g_mutex_unlock (&src->mutex);
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if (ret == GST_FLOW_CUSTOM_ERROR)
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goto retry;
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@ -89,6 +89,10 @@ struct _GstSoupHTTPSrc {
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GCancellable *cancellable;
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GInputStream *input_stream;
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gboolean has_pollable_interface;
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gboolean have_data;
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GMainContext *poll_context;
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GSource *poll_source;
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/* Shoutcast/icecast metadata extraction handling. */
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gboolean iradio_mode;
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