gstreamer/subprojects/gst-plugins-bad/tests/examples/codecs/decoder-caps-update.cpp

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/* GStreamer
* Copyright (C) 2022 Seungha Yang <seungha@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include <stdlib.h>
#include <string>
#include <mutex>
#include "../key-handler.h"
static GMainLoop *loop = nullptr;
static std::mutex input_lock;
static gint par = 1;
static gint fps = 30;
static gboolean set_hdr10 = FALSE;
static GstElement *setter = nullptr;
static gboolean updated = FALSE;
static void
print_keyboard_help (void)
{
static struct
{
const gchar *key_desc;
const gchar *key_help;
} key_controls[] = {
{
"q", "Quit"}, {
"right arrow", "Increase framerate"}, {
"left arrow", "Decrease framerate"}, {
"up arrow", "Increase pixel-aspect-ratio"}, {
"down arrow", "Decrease pixel-aspect-ratio"}, {
"m", "Toggle HDR10 metadata"}, {
"k", "show keyboard shortcuts"}
};
guint i, chars_to_pad, desc_len, max_desc_len = 0;
gst_print ("\n\n%s\n\n", "Keyboard controls:");
for (i = 0; i < G_N_ELEMENTS (key_controls); ++i) {
desc_len = g_utf8_strlen (key_controls[i].key_desc, -1);
max_desc_len = MAX (max_desc_len, desc_len);
}
++max_desc_len;
for (i = 0; i < G_N_ELEMENTS (key_controls); ++i) {
chars_to_pad = max_desc_len - g_utf8_strlen (key_controls[i].key_desc, -1);
gst_print ("\t%s", key_controls[i].key_desc);
gst_print ("%-*s: ", chars_to_pad, "");
gst_print ("%s\n", key_controls[i].key_help);
}
gst_print ("\n");
}
static void
keyboard_cb (gchar input, gboolean is_ascii, gpointer user_data)
{
std::lock_guard<std::mutex> lk (input_lock);
if (!is_ascii) {
switch (input) {
case KB_ARROW_UP:
par++;
updated = TRUE;
gst_println ("Increasing pixel-aspect-ratio to %d", par);
break;
case KB_ARROW_DOWN:
if (par == 1)
return;
par--;
updated = TRUE;
gst_println ("Decreasing pixel-aspect-ratio to %d", par);
break;
case KB_ARROW_RIGHT:
fps++;
updated = TRUE;
gst_println ("Increasing framerate to %d", fps);
break;
case KB_ARROW_LEFT:
if (fps == 1)
return;
fps--;
updated = TRUE;
gst_println ("Decreasing framerate to %d", fps);
break;
default:
break;
}
} else {
switch (input) {
case 'k':
case 'K':
print_keyboard_help ();
break;
case 'q':
case 'Q':
g_main_loop_quit (loop);
break;
case 'm':
case 'M':
set_hdr10 = !set_hdr10;
updated = TRUE;
gst_println ("%sable HDR10 metadata", set_hdr10 ? "En" : "Dis");
break;
default:
break;
}
}
if (updated && setter) {
GstPad *pad = gst_element_get_static_pad (setter, "sink");
GstCaps *caps = gst_pad_get_current_caps (pad);
gst_object_unref (pad);
if (!caps)
return;
if (gst_caps_is_any (caps) || gst_caps_is_empty (caps)) {
gst_caps_unref (caps);
return;
}
caps = gst_caps_make_writable (caps);
gst_caps_set_simple (caps, "pixel-aspect-ratio", GST_TYPE_FRACTION,
par, 1, "framerate", GST_TYPE_FRACTION, fps, 1, nullptr);
if (set_hdr10) {
gst_caps_set_simple (caps, "mastering-display-info", G_TYPE_STRING,
"34000:16000:13250:34500:7500:3000:15635:16450:10000000:1",
"content-light-level", G_TYPE_STRING, "1000:400", nullptr);
}
g_object_set (setter, "caps", caps, nullptr);
gst_caps_unref (caps);
}
}
static void
decoder_caps_notify (GstPad * pad, GParamSpec * pspec, gpointer user_data)
{
GstCaps *caps;
gchar *caps_str;
g_object_get (pad, "caps", &caps, nullptr);
if (!caps)
return;
caps_str = gst_caps_to_string (caps);
gst_println ("\nDecoder output caps\n%s\n", caps_str);
g_free (caps_str);
gst_caps_unref (caps);
}
static gboolean
bus_msg (GstBus * bus, GstMessage * msg, gpointer user_data)
{
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ERROR:{
GError *err;
gchar *dbg;
gst_message_parse_error (msg, &err, &dbg);
gst_printerrln ("ERROR %s", err->message);
if (dbg != NULL)
gst_printerrln ("ERROR debug information: %s", dbg);
g_clear_error (&err);
g_free (dbg);
g_main_loop_quit (loop);
break;
}
case GST_MESSAGE_EOS:
gst_println ("Got EOS");
g_main_loop_quit (loop);
break;
default:
break;
}
return TRUE;
}
gint
main (gint argc, gchar ** argv)
{
GstElement *pipeline;
GError *error = nullptr;
GOptionContext *option_ctx;
gchar *decoder_name = nullptr;
gchar *encoder_name = nullptr;
gchar *sink_name = nullptr;
gchar *location = nullptr;
GOptionEntry options[] = {
{"decoder", 0, 0, G_OPTION_ARG_STRING, &decoder_name,
"Video decoder to use"},
{"encoder", 0, 0, G_OPTION_ARG_STRING, &encoder_name,
"Video encoder description. Ignored if \"location\" is set "
"(example: \"x264enc speed-preset=ultrafast\""},
{"videosink", 0, 0, G_OPTION_ARG_STRING, &sink_name,
"Video sink to use"},
{"location", 0, 0, G_OPTION_ARG_STRING, &location, "File location"},
{nullptr}
};
option_ctx =
g_option_context_new ("Video decoder caps update example");
g_option_context_add_main_entries (option_ctx, options, nullptr);
g_option_context_set_help_enabled (option_ctx, TRUE);
if (!g_option_context_parse (option_ctx, &argc, &argv, &error)) {
gst_printerrln ("option parsing failed: %s\n", error->message);
g_clear_error (&error);
exit (1);
}
g_option_context_free (option_ctx);
gst_init (nullptr, nullptr);
if (!decoder_name) {
gst_printerrln ("Decoder must be specified");
exit (1);
}
if (!encoder_name && !location) {
gst_printerrln ("Encoder or file location must be specified");
exit (1);
}
std::string pipeline_desc;
if (location) {
pipeline_desc = "filesrc location=" + std::string (location)
+ " ! parsebin ! capssetter name=setter ! "
+ std::string (decoder_name) + " name=dec";
} else {
pipeline_desc = "videotestsrc ! " + std::string (encoder_name)
+ " ! parsebin ! capssetter name=setter ! "
+ std::string (decoder_name) + " name=dec";
}
if (sink_name) {
pipeline_desc += " ! " + std::string (sink_name);
} else {
pipeline_desc += " ! fakevideosink";
}
gst_println ("Constructing test pipeline \"%s\"", pipeline_desc.c_str());
loop = g_main_loop_new (nullptr, FALSE);
pipeline = gst_parse_launch (pipeline_desc.c_str(), &error);
if (error) {
gst_printerrln ("Could not construct pipeline, error: %s",
error->message);
exit(1);
}
setter = gst_bin_get_by_name (GST_BIN (pipeline), "setter");
if (!setter) {
gst_printerrln ("Could not get capssetter from pipeline");
exit(1);
}
GstElement *dec = gst_bin_get_by_name (GST_BIN (pipeline), "dec");
if (!dec) {
gst_printerrln ("Could not get decoder from pipeline");
exit(1);
}
GstPad *pad = gst_element_get_static_pad (dec, "src");
g_signal_connect (pad, "notify::caps", G_CALLBACK (decoder_caps_notify),
nullptr);
gst_object_unref (pad);
gst_object_unref (dec);
gst_bus_add_watch (GST_ELEMENT_BUS (pipeline), bus_msg, nullptr);
/* run the pipeline */
GstStateChangeReturn ret =
gst_element_set_state (pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
gst_printerrln ("Pipeline doesn't want to playing");
} else {
set_key_handler ((KeyInputCallback) keyboard_cb, nullptr);
gst_println ("Press k to see supported keyboard inputs");
g_main_loop_run (loop);
unset_key_handler ();
}
input_lock.lock();
gst_clear_object (&setter);
input_lock.unlock();
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_bus_remove_watch (GST_ELEMENT_BUS (pipeline));
gst_object_unref (pipeline);
g_main_loop_unref (loop);
g_free (decoder_name);
g_free (encoder_name);
g_free (location);
return 0;
}