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/*
* vim: set sts=2 sw=2 et :
*
* License: LGPL-2.1+
* Copyright (c) 2014 Nirbheek Chauhan <nirbheek@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.
*/
#include "encode.h"
#include <gst/pbutils/encoding-profile.h>
static gboolean
on_autoplug_continue (GstElement *decodebin,
GstPad *srcpad,
GstCaps *caps,
GstElement *encodebin)
{
gboolean ret;
char *name;
GstPad *sinkpad;
name = gst_caps_to_string (caps);
g_signal_emit_by_name (encodebin, "request-pad", caps, &sinkpad);
if (sinkpad != NULL)
ret = FALSE, g_debug ("encodebin can passthrough %s", name);
else
ret = TRUE, g_debug ("encodebin cannot passthrough %s", name);
if (sinkpad)
gst_object_unref (sinkpad);
g_free (name);
return ret;
}
static void
on_decodebin_pad_added (GstElement *decodebin,
GstPad *srcpad,
GstElement *encodebin)
{
GstCaps *caps;
GstPad *sinkpad = NULL;
char *name;
caps = gst_pad_query_caps (srcpad, NULL);
name = gst_caps_to_string (caps);
/* BUG: We need to ignore subtitle streams. Trying to request
* a pad for this from encodebin causes a pipeline stall. */
if (g_str_has_prefix (name, "text/x-raw"))
goto out;
/* BUG: We don't try to fetch a compatible pad for raw audio because
* that somehow always fails to link. Transmageddon does the same. */
if (!g_str_has_prefix (name, "audio/x-raw"))
/* If we successfully requested a compatible sink pad in
* "autoplug-continue", we can fetch that here. */
sinkpad = gst_element_get_compatible_pad (encodebin, srcpad, NULL);
if (!sinkpad) {
/* We request a sink pad for the decoded stream */
g_signal_emit_by_name (encodebin, "request-pad", caps, &sinkpad);
if (!sinkpad) {
g_critical ("Failed to request a new sink pad for %s", name);
goto out;
}
g_debug ("Requested a new sink pad for %s", name);
} else {
g_debug ("Found an existing sink pad for %s", name);
}
if (gst_pad_link (srcpad, sinkpad) != GST_PAD_LINK_OK)
g_critical ("Couldn't link pads for %s", name);
out:
g_free (name);
gst_caps_unref (caps);
if (sinkpad)
gst_object_unref (sinkpad);
return;
}
static GstEncodingProfile *
create_webm_profile (void)
{
GstEncodingProfile *t;
GstEncodingContainerProfile *prof;
GstCaps *caps;
GstPreset *vp8preset;
caps = gst_caps_from_string ("video/webm");
prof = gst_encoding_container_profile_new ("WebM audio/video", "Standard WEBM/VP8/VORBIS", caps, NULL);
gst_caps_unref (caps);
vp8preset = GST_PRESET (gst_element_factory_make ("vp8enc", "vp8preset"));
/* FIXME: This thing still doesn't encode fast enough in real time */
g_object_set (vp8preset,
"cpu-used", 5,
"end-usage", 1,
"max-quantizer", 56,
"threads", 4,
"undershoot", 95,
NULL);
gst_preset_save_preset (vp8preset, "stp_vp8preset");
gst_object_unref (GST_OBJECT (vp8preset));
caps = gst_caps_from_string ("video/x-vp8");
t = (GstEncodingProfile*) gst_encoding_video_profile_new (caps, "stp_vp8preset",
NULL, 0);
gst_encoding_container_profile_add_profile (prof, t);
gst_caps_unref (caps);
caps = gst_caps_from_string ("audio/x-vorbis");
t = (GstEncodingProfile*) gst_encoding_audio_profile_new (caps, NULL, NULL, 0);
gst_encoding_container_profile_add_profile (prof, t);
gst_caps_unref (caps);
/* What about application/x-ass? */
return (GstEncodingProfile*) prof;
}
void
stp_encode_from_msg (TranscodeServerCtx *ctx)
{
#ifdef ENCODE_DEBUG
char *tmp, *filename;
GstPad *srcpad, *sinkpad;
GstElement *filesink, *q2;
GstPadTemplate *template;
#endif
GstBus *bus;
GstElement *src, *decodebin, *encodebin;
GstElement *tee, *q1, *fakesink;
GstEncodingProfile *profile;
g_debug ("Constructing pipeline");
src = gst_element_factory_make ("appsrc", "src");
g_object_set (src, "is-live", TRUE,
"emit-signals", FALSE,
"stream-type", 0, NULL);
ctx->appsrc = src;
decodebin = gst_element_factory_make ("decodebin", "decodebin");
gst_bin_add_many (GST_BIN (ctx->pipeline), src, decodebin, NULL);
gst_element_link (src, decodebin);
/* TODO: Allow setting of a scaling factor to
* allow realtime encoding of all streams */
profile = create_webm_profile ();
encodebin = gst_element_factory_make ("encodebin", "encodebin");
g_object_set (encodebin,
"profile", profile,
"avoid-reencoding", TRUE, NULL);
tee = gst_element_factory_make ("tee", "tee");
q1 = gst_element_factory_make ("queue", "q1");
fakesink = gst_element_factory_make ("fakesink", "fakesink");
/* Ensure that the stream is always realtime */
g_object_set (fakesink,
"sync", TRUE, NULL);
gst_bin_add_many (GST_BIN (ctx->pipeline), encodebin, tee, q1, fakesink, NULL);
gst_element_link_many (encodebin, tee, q1, fakesink, NULL);
#ifdef ENCODE_DEBUG
q2 = gst_element_factory_make ("queue", "q2");
filesink = gst_element_factory_make ("filesink", "filesink");
tmp = g_uri_escape_string (ctx->path, NULL, TRUE);
filename = g_strdup_printf ("debug-encode-%s.webm", tmp);
g_object_set (filesink, "location", filename, NULL);
gst_bin_add_many (GST_BIN (ctx->pipeline), q2, filesink, NULL);
gst_element_link (q2, filesink);
/* Link pads */
template = gst_pad_template_new ("teesrc", GST_PAD_SRC,
GST_PAD_REQUEST, GST_CAPS_ANY);
srcpad = gst_element_request_pad (tee, template, NULL, GST_CAPS_ANY);
sinkpad = gst_element_get_static_pad (q2, "sink");
gst_pad_link (srcpad, sinkpad);
gst_object_unref (template);
gst_object_unref (srcpad);
gst_object_unref (sinkpad);
g_free (filename);
g_free (tmp);
#endif
/* The pads of decodebin and encodebin are dynamic,
* so those will be linked when streams/pads are added */
/* When decodebin finds a stream that can be decoded, we check
* if we can pass that directly to encodebin instead of letting
* decodebin find a decoding element automatically */
g_signal_connect (decodebin, "autoplug-continue",
G_CALLBACK (on_autoplug_continue), encodebin);
/* When decodebin exposes a source pad, we need to request a
* corresponding sink pad on decodebin */
g_signal_connect (decodebin, "pad-added",
G_CALLBACK (on_decodebin_pad_added), encodebin);
bus = gst_pipeline_get_bus (GST_PIPELINE (ctx->pipeline));
gst_bus_add_signal_watch (bus);
g_signal_connect (bus, "message", G_CALLBACK (stp_on_gst_bus_message), ctx);
g_object_unref (bus);
gst_encoding_profile_unref (profile);
}
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