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authorBastien Nocera <hadess@hadess.net>2022-03-08 14:25:19 +0100
committerBastien Nocera <hadess@hadess.net>2022-03-09 17:49:33 +0100
commit83bb33a25d1a7ecfeff62a786c9ca8949ffa2876 (patch)
tree3b9d2729d11ac5d8d3fca48d0e14cff8bcb5810a /src
parent7a96b6644b7a7dbff6a4776791083462083a10c2 (diff)
downloadtotem-83bb33a25d1a7ecfeff62a786c9ca8949ffa2876.tar.gz
gst: Import video conversion code from GStreamer
So we can modify it for our needs. From gst-plugins-base/gst-libs/gst/video/convertframe.c
Diffstat (limited to 'src')
-rw-r--r--src/gst/totem-gst-pixbuf-helpers.c409
1 files changed, 406 insertions, 3 deletions
diff --git a/src/gst/totem-gst-pixbuf-helpers.c b/src/gst/totem-gst-pixbuf-helpers.c
index d234637ba..8420a41cf 100644
--- a/src/gst/totem-gst-pixbuf-helpers.c
+++ b/src/gst/totem-gst-pixbuf-helpers.c
@@ -2,8 +2,9 @@
* Copyright (C) 2003-2007 the GStreamer project
* Julien Moutte <julien@moutte.net>
* Ronald Bultje <rbultje@ronald.bitfreak.net>
+ * Copyright (C) 2007 Wim Taymans <wim.taymans@gmail.com>
* Copyright (C) 2005-2008 Tim-Philipp Müller <tim centricular net>
- * Copyright (C) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
+ * Copyright (C) 2009,2011 Sebastian Dröge <sebastian.droege@collabora.co.uk>
* Copyright © 2009 Christian Persch
*
* This program is free software; you can redistribute it and/or modify
@@ -34,6 +35,7 @@
#include <gst/tag/tag.h>
#include <gst/video/video-format.h>
+#include <gst/video/gstvideometa.h>
static void
destroy_pixbuf (guchar *pix, gpointer data)
@@ -41,11 +43,405 @@ destroy_pixbuf (guchar *pix, gpointer data)
gst_sample_unref (GST_SAMPLE (data));
}
+static gboolean
+caps_are_raw (const GstCaps * caps)
+{
+ guint i, len;
+
+ len = gst_caps_get_size (caps);
+
+ for (i = 0; i < len; i++) {
+ GstStructure *st = gst_caps_get_structure (caps, i);
+ if (gst_structure_has_name (st, "video/x-raw"))
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+static gboolean
+create_element (const gchar * factory_name, GstElement ** element,
+ GError ** err)
+{
+ *element = gst_element_factory_make (factory_name, NULL);
+ if (*element)
+ return TRUE;
+
+ if (err && *err == NULL) {
+ *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN,
+ "cannot create element '%s' - please check your GStreamer installation",
+ factory_name);
+ }
+
+ return FALSE;
+}
+
+static GstElement *
+get_encoder (const GstCaps * caps, GError ** err)
+{
+ GList *encoders = NULL;
+ GList *filtered = NULL;
+ GstElementFactory *factory = NULL;
+ GstElement *encoder = NULL;
+
+ encoders =
+ gst_element_factory_list_get_elements (GST_ELEMENT_FACTORY_TYPE_ENCODER |
+ GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE, GST_RANK_NONE);
+
+ if (encoders == NULL) {
+ *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN,
+ "Cannot find any image encoder");
+ goto fail;
+ }
+
+ GST_INFO ("got factory list %p", encoders);
+ gst_plugin_feature_list_debug (encoders);
+
+ filtered =
+ gst_element_factory_list_filter (encoders, caps, GST_PAD_SRC, FALSE);
+ GST_INFO ("got filtered list %p", filtered);
+
+ if (filtered == NULL) {
+ gchar *tmp = gst_caps_to_string (caps);
+ *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN,
+ "Cannot find any image encoder for caps %s", tmp);
+ g_free (tmp);
+ goto fail;
+ }
+
+ gst_plugin_feature_list_debug (filtered);
+
+ factory = (GstElementFactory *) filtered->data;
+
+ GST_INFO ("got factory %p", factory);
+ encoder = gst_element_factory_create (factory, NULL);
+
+ GST_INFO ("created encoder element %p, %s", encoder,
+ GST_ELEMENT_NAME (encoder));
+
+fail:
+ if (encoders)
+ gst_plugin_feature_list_free (encoders);
+ if (filtered)
+ gst_plugin_feature_list_free (filtered);
+
+ return encoder;
+}
+
+static GstElement *
+build_convert_frame_pipeline (GstElement ** src_element,
+ GstElement ** sink_element, const GstCaps * from_caps,
+ GstVideoCropMeta * cmeta, const GstCaps * to_caps, GError ** err)
+{
+ GstElement *vcrop = NULL, *csp = NULL, *csp2 = NULL, *vscale = NULL;
+ GstElement *src = NULL, *sink = NULL, *encoder = NULL, *pipeline;
+ GstVideoInfo info;
+ GError *error = NULL;
+
+ if (cmeta) {
+ if (!create_element ("videocrop", &vcrop, &error)) {
+ g_error_free (error);
+ g_warning
+ ("build_convert_frame_pipeline: Buffer has crop metadata but videocrop element is not found. Cropping will be disabled");
+ } else {
+ if (!create_element ("videoconvert", &csp2, &error))
+ goto no_elements;
+ }
+ }
+
+ /* videoscale is here to correct for the pixel-aspect-ratio for us */
+ GST_DEBUG ("creating elements");
+ if (!create_element ("appsrc", &src, &error) ||
+ !create_element ("videoconvert", &csp, &error) ||
+ !create_element ("videoscale", &vscale, &error) ||
+ !create_element ("appsink", &sink, &error))
+ goto no_elements;
+
+ pipeline = gst_pipeline_new ("videoconvert-pipeline");
+ if (pipeline == NULL)
+ goto no_pipeline;
+
+ /* Add black borders if necessary to keep the DAR */
+ g_object_set (vscale, "add-borders", TRUE, NULL);
+
+ GST_DEBUG ("adding elements");
+ gst_bin_add_many (GST_BIN (pipeline), src, csp, vscale, sink, NULL);
+ if (vcrop)
+ gst_bin_add_many (GST_BIN (pipeline), vcrop, csp2, NULL);
+
+ /* set caps */
+ g_object_set (src, "caps", from_caps, NULL);
+ if (vcrop) {
+ gst_video_info_from_caps (&info, from_caps);
+ g_object_set (vcrop, "left", cmeta->x, NULL);
+ g_object_set (vcrop, "top", cmeta->y, NULL);
+ g_object_set (vcrop, "right", GST_VIDEO_INFO_WIDTH (&info) - cmeta->width,
+ NULL);
+ g_object_set (vcrop, "bottom",
+ GST_VIDEO_INFO_HEIGHT (&info) - cmeta->height, NULL);
+ GST_DEBUG ("crop meta [x,y,width,height]: %d %d %d %d", cmeta->x, cmeta->y,
+ cmeta->width, cmeta->height);
+ }
+ g_object_set (sink, "caps", to_caps, NULL);
+
+ /* FIXME: linking is still way too expensive, profile this properly */
+ if (vcrop) {
+ GST_DEBUG ("linking src->csp2");
+ if (!gst_element_link_pads (src, "src", csp2, "sink"))
+ goto link_failed;
+
+ GST_DEBUG ("linking csp2->vcrop");
+ if (!gst_element_link_pads (csp2, "src", vcrop, "sink"))
+ goto link_failed;
+
+ GST_DEBUG ("linking vcrop->csp");
+ if (!gst_element_link_pads (vcrop, "src", csp, "sink"))
+ goto link_failed;
+ } else {
+ GST_DEBUG ("linking src->csp");
+ if (!gst_element_link_pads (src, "src", csp, "sink"))
+ goto link_failed;
+ }
+
+ GST_DEBUG ("linking csp->vscale");
+ if (!gst_element_link_pads_full (csp, "src", vscale, "sink",
+ GST_PAD_LINK_CHECK_NOTHING))
+ goto link_failed;
+
+ if (caps_are_raw (to_caps)) {
+ GST_DEBUG ("linking vscale->sink");
+
+ if (!gst_element_link_pads_full (vscale, "src", sink, "sink",
+ GST_PAD_LINK_CHECK_NOTHING))
+ goto link_failed;
+ } else {
+ encoder = get_encoder (to_caps, &error);
+ if (!encoder)
+ goto no_encoder;
+ gst_bin_add (GST_BIN (pipeline), encoder);
+
+ GST_DEBUG ("linking vscale->encoder");
+ if (!gst_element_link (vscale, encoder))
+ goto link_failed;
+
+ GST_DEBUG ("linking encoder->sink");
+ if (!gst_element_link_pads (encoder, "src", sink, "sink"))
+ goto link_failed;
+ }
+
+ g_object_set (src, "emit-signals", TRUE, NULL);
+ g_object_set (sink, "emit-signals", TRUE, NULL);
+
+ *src_element = src;
+ *sink_element = sink;
+
+ return pipeline;
+ /* ERRORS */
+no_encoder:
+ {
+ gst_object_unref (pipeline);
+
+ GST_ERROR ("could not find an encoder for provided caps");
+ if (err)
+ *err = error;
+ else
+ g_error_free (error);
+
+ return NULL;
+ }
+no_elements:
+ {
+ if (src)
+ gst_object_unref (src);
+ if (vcrop)
+ gst_object_unref (vcrop);
+ if (csp)
+ gst_object_unref (csp);
+ if (csp2)
+ gst_object_unref (csp2);
+ if (vscale)
+ gst_object_unref (vscale);
+ if (sink)
+ gst_object_unref (sink);
+ GST_ERROR ("Could not convert video frame: %s", error->message);
+ if (err)
+ *err = error;
+ else
+ g_error_free (error);
+ return NULL;
+ }
+no_pipeline:
+ {
+ gst_object_unref (src);
+ if (vcrop)
+ gst_object_unref (vcrop);
+ gst_object_unref (csp);
+ if (csp2)
+ gst_object_unref (csp2);
+ gst_object_unref (vscale);
+ gst_object_unref (sink);
+
+ GST_ERROR ("Could not convert video frame: no pipeline (unknown error)");
+ if (err)
+ *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
+ "Could not convert video frame: no pipeline (unknown error)");
+ return NULL;
+ }
+link_failed:
+ {
+ gst_object_unref (pipeline);
+
+ GST_ERROR ("Could not convert video frame: failed to link elements");
+ if (err)
+ *err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
+ "Could not convert video frame: failed to link elements");
+ return NULL;
+ }
+}
+
+/**
+ * totem_gst_video_convert_sample:
+ * @sample: a #GstSample
+ * @to_caps: the #GstCaps to convert to
+ * @timeout: the maximum amount of time allowed for the processing.
+ * @error: pointer to a #GError. Can be %NULL.
+ *
+ * Converts a raw video buffer into the specified output caps.
+ *
+ * The output caps can be any raw video formats or any image formats (jpeg, png, ...).
+ *
+ * The width, height and pixel-aspect-ratio can also be specified in the output caps.
+ *
+ * Returns: The converted #GstSample, or %NULL if an error happened (in which case @err
+ * will point to the #GError).
+ */
+static GstSample *
+totem_gst_video_convert_sample (GstSample * sample, const GstCaps * to_caps,
+ GstClockTime timeout, GError ** error)
+{
+ GstMessage *msg;
+ GstBuffer *buf;
+ GstSample *result = NULL;
+ GError *err = NULL;
+ GstBus *bus;
+ GstCaps *from_caps, *to_caps_copy = NULL;
+ GstFlowReturn ret;
+ GstElement *pipeline, *src, *sink;
+ guint i, n;
+
+ g_return_val_if_fail (sample != NULL, NULL);
+ g_return_val_if_fail (to_caps != NULL, NULL);
+
+ buf = gst_sample_get_buffer (sample);
+ g_return_val_if_fail (buf != NULL, NULL);
+
+ from_caps = gst_sample_get_caps (sample);
+ g_return_val_if_fail (from_caps != NULL, NULL);
+
+ to_caps_copy = gst_caps_new_empty ();
+ n = gst_caps_get_size (to_caps);
+ for (i = 0; i < n; i++) {
+ GstStructure *s = gst_caps_get_structure (to_caps, i);
+
+ s = gst_structure_copy (s);
+ gst_structure_remove_field (s, "framerate");
+ gst_caps_append_structure (to_caps_copy, s);
+ }
+
+ pipeline =
+ build_convert_frame_pipeline (&src, &sink, from_caps,
+ gst_buffer_get_video_crop_meta (buf), to_caps_copy, &err);
+ if (!pipeline)
+ goto no_pipeline;
+
+ /* now set the pipeline to the paused state, after we push the buffer into
+ * appsrc, this should preroll the converted buffer in appsink */
+ GST_DEBUG ("running conversion pipeline to caps %" GST_PTR_FORMAT,
+ to_caps_copy);
+ if (gst_element_set_state (pipeline,
+ GST_STATE_PAUSED) == GST_STATE_CHANGE_FAILURE)
+ goto state_change_failed;
+
+ /* feed buffer in appsrc */
+ GST_DEBUG ("feeding buffer %p, size %" G_GSIZE_FORMAT ", caps %"
+ GST_PTR_FORMAT, buf, gst_buffer_get_size (buf), from_caps);
+ g_signal_emit_by_name (src, "push-buffer", buf, &ret);
+
+ /* now see what happens. We either got an error somewhere or the pipeline
+ * prerolled */
+ bus = gst_element_get_bus (pipeline);
+ msg = gst_bus_timed_pop_filtered (bus,
+ timeout, GST_MESSAGE_ERROR | GST_MESSAGE_ASYNC_DONE);
+
+ if (msg) {
+ switch (GST_MESSAGE_TYPE (msg)) {
+ case GST_MESSAGE_ASYNC_DONE:
+ {
+ /* we're prerolled, get the frame from appsink */
+ g_signal_emit_by_name (sink, "pull-preroll", &result);
+
+ if (result) {
+ GST_DEBUG ("conversion successful: result = %p", result);
+ } else {
+ GST_ERROR ("prerolled but no result frame?!");
+ }
+ break;
+ }
+ case GST_MESSAGE_ERROR:{
+ gchar *dbg = NULL;
+
+ gst_message_parse_error (msg, &err, &dbg);
+ if (err) {
+ GST_ERROR ("Could not convert video frame: %s", err->message);
+ GST_DEBUG ("%s [debug: %s]", err->message, GST_STR_NULL (dbg));
+ if (error)
+ *error = err;
+ else
+ g_error_free (err);
+ }
+ g_free (dbg);
+ break;
+ }
+ default:{
+ g_return_val_if_reached (NULL);
+ }
+ }
+ gst_message_unref (msg);
+ } else {
+ GST_ERROR ("Could not convert video frame: timeout during conversion");
+ if (error)
+ *error = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_FAILED,
+ "Could not convert video frame: timeout during conversion");
+ }
+
+ gst_element_set_state (pipeline, GST_STATE_NULL);
+ gst_object_unref (bus);
+ gst_object_unref (pipeline);
+ gst_caps_unref (to_caps_copy);
+
+ return result;
+
+ /* ERRORS */
+no_pipeline:
+state_change_failed:
+ {
+ gst_caps_unref (to_caps_copy);
+
+ if (error)
+ *error = err;
+ else
+ g_error_free (err);
+
+ return NULL;
+ }
+}
+
GdkPixbuf *
totem_gst_playbin_get_frame (GstElement *play, GError **error)
{
GstStructure *s;
GstSample *sample = NULL;
+ GstSample *last_sample = NULL;
GdkPixbuf *pixbuf = NULL;
GstCaps *to_caps, *sample_caps;
gint outwidth = 0;
@@ -70,12 +466,19 @@ totem_gst_playbin_get_frame (GstElement *play, GError **error)
NULL);
/* get frame */
- g_signal_emit_by_name (play, "convert-sample", to_caps, &sample);
+ g_object_get (G_OBJECT (play), "sample", &last_sample, NULL);
+ if (!last_sample) {
+ g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+ "Failed to retrieve video frame");
+ return NULL;
+ }
+ sample = totem_gst_video_convert_sample (last_sample, to_caps, 25 * GST_SECOND, error);
+ gst_sample_unref (last_sample);
gst_caps_unref (to_caps);
if (!sample) {
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
- "Failed to retrieve or convert video frame");
+ "Failed to convert video frame");
return NULL;
}