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gstreamer/ext/assrender/gstassrender.c
Tim-Philipp Müller ab12a4cd0f assrender: fix seeking backwards 
Use proper API to flush libass events when we do
a flushing seek, and also do it in FLUSH_STOP
rather than FLUSH_START, so we can be sure
streaming has stopped.

Fixes seeking back in time.

Something seems to have changed in libass that
renders the old manual way of flushing events
ineffective and libass then seems to ignore
timestamps that are older than the ones last
seen then if we do it the old way.

Fixes #916
2019-04-06 15:19:07 +01:00

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/*
* Copyright (c) 2008 Benjamin Schmitz <vortex@wolpzone.de>
* Copyright (c) 2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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.
*/
/**
* SECTION:element-assrender
* @title: assrender
*
* Renders timestamped SSA/ASS subtitles on top of a video stream.
*
* ## Example launch line
* |[
* gst-launch-1.0 -v filesrc location=/path/to/mkv ! matroskademux name=d ! queue ! mpegaudioparse ! mpg123audiodec ! audioconvert ! autoaudiosink d. ! queue ! h264parse ! avdec_h264 ! videoconvert ! r. d. ! queue ! "application/x-ass" ! assrender name=r ! videoconvert ! autovideosink
* ]| This pipeline demuxes a Matroska file with h.264 video, MP3 audio and embedded ASS subtitles and renders the subtitles on top of the video.
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/video/gstvideometa.h>
#include "gstassrender.h"
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_ass_render_debug);
GST_DEBUG_CATEGORY_STATIC (gst_ass_render_lib_debug);
#define GST_CAT_DEFAULT gst_ass_render_debug
/* Filter signals and props */
enum
{
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_ENABLE,
PROP_EMBEDDEDFONTS,
PROP_WAIT_TEXT
};
/* FIXME: video-blend.c doesn't support formats with more than 8 bit per
* component (which get unpacked into ARGB64 or AYUV64) yet, such as:
* v210, v216, UYVP, GRAY16_LE, GRAY16_BE */
#define FORMATS "{ BGRx, RGBx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, \
I420, YV12, AYUV, YUY2, UYVY, v308, Y41B, Y42B, Y444, \
NV12, NV21, A420, YUV9, YVU9, IYU1, GRAY8 }"
#define ASSRENDER_CAPS GST_VIDEO_CAPS_MAKE(FORMATS)
#define ASSRENDER_ALL_CAPS ASSRENDER_CAPS ";" \
GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("ANY", GST_VIDEO_FORMATS_ALL)
static GstStaticCaps sw_template_caps = GST_STATIC_CAPS (ASSRENDER_CAPS);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ASSRENDER_ALL_CAPS)
);
static GstStaticPadTemplate video_sink_factory =
GST_STATIC_PAD_TEMPLATE ("video_sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ASSRENDER_ALL_CAPS)
);
static GstStaticPadTemplate text_sink_factory =
GST_STATIC_PAD_TEMPLATE ("text_sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-ass; application/x-ssa")
);
#define GST_ASS_RENDER_GET_LOCK(ass) (&GST_ASS_RENDER (ass)->lock)
#define GST_ASS_RENDER_GET_COND(ass) (&GST_ASS_RENDER (ass)->cond)
#define GST_ASS_RENDER_LOCK(ass) (g_mutex_lock (GST_ASS_RENDER_GET_LOCK (ass)))
#define GST_ASS_RENDER_UNLOCK(ass) (g_mutex_unlock (GST_ASS_RENDER_GET_LOCK (ass)))
#define GST_ASS_RENDER_WAIT(ass) (g_cond_wait (GST_ASS_RENDER_GET_COND (ass), GST_ASS_RENDER_GET_LOCK (ass)))
#define GST_ASS_RENDER_SIGNAL(ass) (g_cond_signal (GST_ASS_RENDER_GET_COND (ass)))
#define GST_ASS_RENDER_BROADCAST(ass)(g_cond_broadcast (GST_ASS_RENDER_GET_COND (ass)))
static void gst_ass_render_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_ass_render_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_ass_render_finalize (GObject * object);
static GstStateChangeReturn gst_ass_render_change_state (GstElement * element,
GstStateChange transition);
#define gst_ass_render_parent_class parent_class
G_DEFINE_TYPE (GstAssRender, gst_ass_render, GST_TYPE_ELEMENT);
static GstCaps *gst_ass_render_get_videosink_caps (GstPad * pad,
GstAssRender * render, GstCaps * filter);
static GstCaps *gst_ass_render_get_src_caps (GstPad * pad,
GstAssRender * render, GstCaps * filter);
static gboolean gst_ass_render_setcaps_video (GstPad * pad,
GstAssRender * render, GstCaps * caps);
static gboolean gst_ass_render_setcaps_text (GstPad * pad,
GstAssRender * render, GstCaps * caps);
static GstFlowReturn gst_ass_render_chain_video (GstPad * pad,
GstObject * parent, GstBuffer * buf);
static GstFlowReturn gst_ass_render_chain_text (GstPad * pad,
GstObject * parent, GstBuffer * buf);
static gboolean gst_ass_render_event_video (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_ass_render_event_text (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_ass_render_event_src (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_ass_render_query_video (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean gst_ass_render_query_src (GstPad * pad, GstObject * parent,
GstQuery * query);
/* initialize the plugin's class */
static void
gst_ass_render_class_init (GstAssRenderClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = gst_ass_render_set_property;
gobject_class->get_property = gst_ass_render_get_property;
gobject_class->finalize = gst_ass_render_finalize;
g_object_class_install_property (gobject_class, PROP_ENABLE,
g_param_spec_boolean ("enable", "Enable",
"Enable rendering of subtitles", TRUE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_EMBEDDEDFONTS,
g_param_spec_boolean ("embeddedfonts", "Embedded Fonts",
"Extract and use fonts embedded in the stream", TRUE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_WAIT_TEXT,
g_param_spec_boolean ("wait-text", "Wait Text",
"Whether to wait for subtitles", TRUE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_ass_render_change_state);
gst_element_class_add_static_pad_template (gstelement_class, &src_factory);
gst_element_class_add_static_pad_template (gstelement_class,
&video_sink_factory);
gst_element_class_add_static_pad_template (gstelement_class,
&text_sink_factory);
gst_element_class_set_static_metadata (gstelement_class, "ASS/SSA Render",
"Mixer/Video/Overlay/Subtitle",
"Renders ASS/SSA subtitles with libass",
"Benjamin Schmitz <vortex@wolpzone.de>, "
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
}
static void
_libass_message_cb (gint level, const gchar * fmt, va_list args,
gpointer render)
{
gchar *message = g_strdup_vprintf (fmt, args);
if (level < 2)
GST_CAT_ERROR_OBJECT (gst_ass_render_lib_debug, render, "%s", message);
else if (level < 4)
GST_CAT_WARNING_OBJECT (gst_ass_render_lib_debug, render, "%s", message);
else if (level < 5)
GST_CAT_INFO_OBJECT (gst_ass_render_lib_debug, render, "%s", message);
else if (level < 6)
GST_CAT_DEBUG_OBJECT (gst_ass_render_lib_debug, render, "%s", message);
else
GST_CAT_LOG_OBJECT (gst_ass_render_lib_debug, render, "%s", message);
g_free (message);
}
static void
gst_ass_render_init (GstAssRender * render)
{
GST_DEBUG_OBJECT (render, "init");
render->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
render->video_sinkpad =
gst_pad_new_from_static_template (&video_sink_factory, "video_sink");
render->text_sinkpad =
gst_pad_new_from_static_template (&text_sink_factory, "text_sink");
gst_pad_set_chain_function (render->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_chain_video));
gst_pad_set_chain_function (render->text_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_chain_text));
gst_pad_set_event_function (render->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_event_video));
gst_pad_set_event_function (render->text_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_event_text));
gst_pad_set_event_function (render->srcpad,
GST_DEBUG_FUNCPTR (gst_ass_render_event_src));
gst_pad_set_query_function (render->srcpad,
GST_DEBUG_FUNCPTR (gst_ass_render_query_src));
gst_pad_set_query_function (render->video_sinkpad,
GST_DEBUG_FUNCPTR (gst_ass_render_query_video));
GST_PAD_SET_PROXY_ALLOCATION (render->video_sinkpad);
gst_element_add_pad (GST_ELEMENT (render), render->srcpad);
gst_element_add_pad (GST_ELEMENT (render), render->video_sinkpad);
gst_element_add_pad (GST_ELEMENT (render), render->text_sinkpad);
gst_video_info_init (&render->info);
g_mutex_init (&render->lock);
g_cond_init (&render->cond);
render->renderer_init_ok = FALSE;
render->track_init_ok = FALSE;
render->enable = TRUE;
render->embeddedfonts = TRUE;
render->wait_text = FALSE;
gst_segment_init (&render->video_segment, GST_FORMAT_TIME);
gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME);
g_mutex_init (&render->ass_mutex);
render->ass_library = ass_library_init ();
ass_set_message_cb (render->ass_library, _libass_message_cb, render);
ass_set_extract_fonts (render->ass_library, 1);
render->ass_renderer = ass_renderer_init (render->ass_library);
if (!render->ass_renderer) {
GST_WARNING_OBJECT (render, "cannot create renderer instance");
g_assert_not_reached ();
}
render->ass_track = NULL;
GST_DEBUG_OBJECT (render, "init complete");
}
static void
gst_ass_render_finalize (GObject * object)
{
GstAssRender *render = GST_ASS_RENDER (object);
g_mutex_clear (&render->lock);
g_cond_clear (&render->cond);
if (render->ass_track) {
ass_free_track (render->ass_track);
}
if (render->ass_renderer) {
ass_renderer_done (render->ass_renderer);
}
if (render->ass_library) {
ass_library_done (render->ass_library);
}
g_mutex_clear (&render->ass_mutex);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_ass_render_reset_composition (GstAssRender * render)
{
if (render->composition) {
gst_video_overlay_composition_unref (render->composition);
render->composition = NULL;
}
}
static void
gst_ass_render_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAssRender *render = GST_ASS_RENDER (object);
GST_ASS_RENDER_LOCK (render);
switch (prop_id) {
case PROP_ENABLE:
render->enable = g_value_get_boolean (value);
break;
case PROP_EMBEDDEDFONTS:
render->embeddedfonts = g_value_get_boolean (value);
g_mutex_lock (&render->ass_mutex);
ass_set_extract_fonts (render->ass_library, render->embeddedfonts);
g_mutex_unlock (&render->ass_mutex);
break;
case PROP_WAIT_TEXT:
render->wait_text = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_ASS_RENDER_UNLOCK (render);
}
static void
gst_ass_render_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAssRender *render = GST_ASS_RENDER (object);
GST_ASS_RENDER_LOCK (render);
switch (prop_id) {
case PROP_ENABLE:
g_value_set_boolean (value, render->enable);
break;
case PROP_EMBEDDEDFONTS:
g_value_set_boolean (value, render->embeddedfonts);
break;
case PROP_WAIT_TEXT:
g_value_set_boolean (value, render->wait_text);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_ASS_RENDER_UNLOCK (render);
}
/* Called with lock held */
static void
gst_ass_render_pop_text (GstAssRender * render)
{
while (render->subtitle_pending) {
GST_DEBUG_OBJECT (render, "releasing text buffer %p",
render->subtitle_pending->data);
gst_buffer_unref (render->subtitle_pending->data);
render->subtitle_pending =
g_slist_delete_link (render->subtitle_pending,
render->subtitle_pending);
}
/* Let the text task know we used that buffer */
GST_ASS_RENDER_BROADCAST (render);
}
static GstStateChangeReturn
gst_ass_render_change_state (GstElement * element, GstStateChange transition)
{
GstAssRender *render = GST_ASS_RENDER (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_ASS_RENDER_LOCK (render);
render->subtitle_flushing = TRUE;
render->video_flushing = TRUE;
gst_ass_render_pop_text (render);
GST_ASS_RENDER_UNLOCK (render);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
g_mutex_lock (&render->ass_mutex);
if (render->ass_track)
ass_free_track (render->ass_track);
render->ass_track = NULL;
render->track_init_ok = FALSE;
render->renderer_init_ok = FALSE;
gst_ass_render_reset_composition (render);
g_mutex_unlock (&render->ass_mutex);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_ASS_RENDER_LOCK (render);
render->subtitle_flushing = FALSE;
render->video_flushing = FALSE;
render->video_eos = FALSE;
render->subtitle_eos = FALSE;
gst_segment_init (&render->video_segment, GST_FORMAT_TIME);
gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME);
GST_ASS_RENDER_UNLOCK (render);
break;
default:
break;
}
return ret;
}
static gboolean
gst_ass_render_query_src (GstPad * pad, GstObject * parent, GstQuery * query)
{
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_ass_render_get_src_caps (pad, (GstAssRender *) parent, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
static gboolean
gst_ass_render_event_src (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstAssRender *render = GST_ASS_RENDER (parent);
gboolean ret;
GST_DEBUG_OBJECT (render, "received src event %" GST_PTR_FORMAT, event);
/* FIXME: why not just always push it on text pad? */
if (render->track_init_ok) {
ret = gst_pad_push_event (render->video_sinkpad, gst_event_ref (event));
gst_pad_push_event (render->text_sinkpad, event);
} else {
ret = gst_pad_push_event (render->video_sinkpad, event);
}
return ret;
}
/**
* gst_ass_render_add_feature_and_intersect:
*
* Creates a new #GstCaps containing the (given caps +
* given caps feature) + (given caps intersected by the
* given filter).
*
* Returns: the new #GstCaps
*/
static GstCaps *
gst_ass_render_add_feature_and_intersect (GstCaps * caps,
const gchar * feature, GstCaps * filter)
{
int i, caps_size;
GstCaps *new_caps;
new_caps = gst_caps_copy (caps);
caps_size = gst_caps_get_size (new_caps);
for (i = 0; i < caps_size; i++) {
GstCapsFeatures *features = gst_caps_get_features (new_caps, i);
if (!gst_caps_features_is_any (features)) {
gst_caps_features_add (features, feature);
}
}
gst_caps_append (new_caps, gst_caps_intersect_full (caps,
filter, GST_CAPS_INTERSECT_FIRST));
return new_caps;
}
/**
* gst_ass_render_intersect_by_feature:
*
* Creates a new #GstCaps based on the following filtering rule.
*
* For each individual caps contained in given caps, if the
* caps uses the given caps feature, keep a version of the caps
* with the feature and an another one without. Otherwise, intersect
* the caps with the given filter.
*
* Returns: the new #GstCaps
*/
static GstCaps *
gst_ass_render_intersect_by_feature (GstCaps * caps,
const gchar * feature, GstCaps * filter)
{
int i, caps_size;
GstCaps *new_caps;
new_caps = gst_caps_new_empty ();
caps_size = gst_caps_get_size (caps);
for (i = 0; i < caps_size; i++) {
GstStructure *caps_structure = gst_caps_get_structure (caps, i);
GstCapsFeatures *caps_features =
gst_caps_features_copy (gst_caps_get_features (caps, i));
GstCaps *filtered_caps;
GstCaps *simple_caps =
gst_caps_new_full (gst_structure_copy (caps_structure), NULL);
gst_caps_set_features (simple_caps, 0, caps_features);
if (gst_caps_features_contains (caps_features, feature)) {
gst_caps_append (new_caps, gst_caps_copy (simple_caps));
gst_caps_features_remove (caps_features, feature);
filtered_caps = gst_caps_ref (simple_caps);
} else {
filtered_caps = gst_caps_intersect_full (simple_caps, filter,
GST_CAPS_INTERSECT_FIRST);
}
gst_caps_unref (simple_caps);
gst_caps_append (new_caps, filtered_caps);
}
return new_caps;
}
static GstCaps *
gst_ass_render_get_videosink_caps (GstPad * pad, GstAssRender * render,
GstCaps * filter)
{
GstPad *srcpad = render->srcpad;
GstCaps *peer_caps = NULL, *caps = NULL, *assrender_filter = NULL;
if (filter) {
/* filter caps + composition feature + filter caps
* filtered by the software caps. */
GstCaps *sw_caps = gst_static_caps_get (&sw_template_caps);
assrender_filter = gst_ass_render_add_feature_and_intersect (filter,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, sw_caps);
gst_caps_unref (sw_caps);
GST_DEBUG_OBJECT (render, "assrender filter %" GST_PTR_FORMAT,
assrender_filter);
}
peer_caps = gst_pad_peer_query_caps (srcpad, assrender_filter);
if (assrender_filter)
gst_caps_unref (assrender_filter);
if (peer_caps) {
GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peer_caps);
if (gst_caps_is_any (peer_caps)) {
/* if peer returns ANY caps, return filtered src pad template caps */
caps = gst_caps_copy (gst_pad_get_pad_template_caps (srcpad));
} else {
/* duplicate caps which contains the composition into one version with
* the meta and one without. Filter the other caps by the software caps */
GstCaps *sw_caps = gst_static_caps_get (&sw_template_caps);
caps = gst_ass_render_intersect_by_feature (peer_caps,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, sw_caps);
gst_caps_unref (sw_caps);
}
gst_caps_unref (peer_caps);
} else {
/* no peer, our padtemplate is enough then */
caps = gst_pad_get_pad_template_caps (pad);
}
if (filter) {
GstCaps *intersection = gst_caps_intersect_full (filter, caps,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = intersection;
}
GST_DEBUG_OBJECT (render, "returning %" GST_PTR_FORMAT, caps);
return caps;
}
static GstCaps *
gst_ass_render_get_src_caps (GstPad * pad, GstAssRender * render,
GstCaps * filter)
{
GstPad *sinkpad = render->video_sinkpad;
GstCaps *peer_caps = NULL, *caps = NULL, *assrender_filter = NULL;
if (filter) {
/* duplicate filter caps which contains the composition into one version
* with the meta and one without. Filter the other caps by the software
* caps */
GstCaps *sw_caps = gst_static_caps_get (&sw_template_caps);
assrender_filter =
gst_ass_render_intersect_by_feature (filter,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, sw_caps);
gst_caps_unref (sw_caps);
}
peer_caps = gst_pad_peer_query_caps (sinkpad, assrender_filter);
if (assrender_filter)
gst_caps_unref (assrender_filter);
if (peer_caps) {
GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peer_caps);
if (gst_caps_is_any (peer_caps)) {
/* if peer returns ANY caps, return filtered sink pad template caps */
caps = gst_caps_copy (gst_pad_get_pad_template_caps (sinkpad));
} else {
/* return upstream caps + composition feature + upstream caps
* filtered by the software caps. */
GstCaps *sw_caps = gst_static_caps_get (&sw_template_caps);
caps = gst_ass_render_add_feature_and_intersect (peer_caps,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, sw_caps);
gst_caps_unref (sw_caps);
}
gst_caps_unref (peer_caps);
} else {
/* no peer, our padtemplate is enough then */
caps = gst_pad_get_pad_template_caps (pad);
}
if (filter) {
GstCaps *intersection;
intersection =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = intersection;
}
GST_DEBUG_OBJECT (render, "returning %" GST_PTR_FORMAT, caps);
return caps;
}
static void
blit_bgra_premultiplied (GstAssRender * render, ASS_Image * ass_image,
guint8 * data, gint width, gint height, gint stride, gint x_off, gint y_off)
{
guint counter = 0;
gint alpha, r, g, b, k;
const guint8 *src;
guint8 *dst;
gint x, y, w, h;
gint dst_skip;
gint src_skip;
gint dst_x, dst_y;
memset (data, 0, stride * height);
while (ass_image) {
dst_x = ass_image->dst_x + x_off;
dst_y = ass_image->dst_y + y_off;
w = MIN (ass_image->w, width - dst_x);
h = MIN (ass_image->h, height - dst_y);
if (w <= 0 || h <= 0)
goto next;
alpha = 255 - (ass_image->color & 0xff);
if (!alpha)
goto next;
r = ((ass_image->color) >> 24) & 0xff;
g = ((ass_image->color) >> 16) & 0xff;
b = ((ass_image->color) >> 8) & 0xff;
src = ass_image->bitmap;
dst = data + dst_y * stride + dst_x * 4;
src_skip = ass_image->stride - w;
dst_skip = stride - w * 4;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
if (src[0]) {
k = src[0] * alpha / 255;
if (dst[3] == 0) {
dst[3] = k;
dst[2] = (k * r) / 255;
dst[1] = (k * g) / 255;
dst[0] = (k * b) / 255;
} else {
dst[3] = k + (255 - k) * dst[3] / 255;
dst[2] = (k * r + (255 - k) * dst[2]) / 255;
dst[1] = (k * g + (255 - k) * dst[1]) / 255;
dst[0] = (k * b + (255 - k) * dst[0]) / 255;
}
}
src++;
dst += 4;
}
src += src_skip;
dst += dst_skip;
}
next:
counter++;
ass_image = ass_image->next;
}
GST_LOG_OBJECT (render, "amount of rendered ass_image: %u", counter);
}
static gboolean
gst_ass_render_can_handle_caps (GstCaps * incaps)
{
static GstStaticCaps static_caps = GST_STATIC_CAPS (ASSRENDER_CAPS);
gboolean ret;
GstCaps *caps;
caps = gst_static_caps_get (&static_caps);
ret = gst_caps_is_subset (incaps, caps);
gst_caps_unref (caps);
return ret;
}
static void
gst_ass_render_update_render_size (GstAssRender * render)
{
gdouble video_aspect = (gdouble) render->info.width /
(gdouble) render->info.height;
gdouble window_aspect = (gdouble) render->window_width /
(gdouble) render->window_height;
/* render at the window size, with the video aspect ratio */
if (video_aspect >= window_aspect) {
render->ass_frame_width = render->window_width;
render->ass_frame_height = render->window_width / video_aspect;
} else {
render->ass_frame_width = render->window_height * video_aspect;
render->ass_frame_height = render->window_height;
}
}
static gboolean
gst_ass_render_negotiate (GstAssRender * render, GstCaps * caps)
{
gboolean upstream_has_meta = FALSE;
gboolean caps_has_meta = FALSE;
gboolean alloc_has_meta = FALSE;
gboolean attach = FALSE;
gboolean ret = TRUE;
guint width, height;
GstCapsFeatures *f;
GstCaps *overlay_caps;
GstQuery *query;
guint alloc_index;
GST_DEBUG_OBJECT (render, "performing negotiation");
/* Clear cached composition */
gst_ass_render_reset_composition (render);
/* Clear any pending reconfigure flag */
gst_pad_check_reconfigure (render->srcpad);
if (!caps)
caps = gst_pad_get_current_caps (render->video_sinkpad);
else
gst_caps_ref (caps);
if (!caps || gst_caps_is_empty (caps))
goto no_format;
/* Check if upstream caps have meta */
if ((f = gst_caps_get_features (caps, 0))) {
upstream_has_meta = gst_caps_features_contains (f,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION);
}
/* Initialize dimensions */
width = render->info.width;
height = render->info.height;
if (upstream_has_meta) {
overlay_caps = gst_caps_ref (caps);
} else {
GstCaps *peercaps;
/* BaseTransform requires caps for the allocation query to work */
overlay_caps = gst_caps_copy (caps);
f = gst_caps_get_features (overlay_caps, 0);
gst_caps_features_add (f,
GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION);
/* Then check if downstream accept overlay composition in caps */
/* FIXME: We should probably check if downstream *prefers* the
* overlay meta, and only enforce usage of it if we can't handle
* the format ourselves and thus would have to drop the overlays.
* Otherwise we should prefer what downstream wants here.
*/
peercaps = gst_pad_peer_query_caps (render->srcpad, NULL);
caps_has_meta = gst_caps_can_intersect (peercaps, overlay_caps);
gst_caps_unref (peercaps);
GST_DEBUG ("caps have overlay meta %d", caps_has_meta);
}
if (upstream_has_meta || caps_has_meta) {
/* Send caps immediatly, it's needed by GstBaseTransform to get a reply
* from allocation query */
ret = gst_pad_set_caps (render->srcpad, overlay_caps);
/* First check if the allocation meta has compositon */
query = gst_query_new_allocation (overlay_caps, FALSE);
if (!gst_pad_peer_query (render->srcpad, query)) {
/* no problem, we use the query defaults */
GST_DEBUG_OBJECT (render, "ALLOCATION query failed");
/* In case we were flushing, mark reconfigure and fail this method,
* will make it retry */
if (render->video_flushing)
ret = FALSE;
}
alloc_has_meta = gst_query_find_allocation_meta (query,
GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE, &alloc_index);
GST_DEBUG ("sink alloc has overlay meta %d", alloc_has_meta);
if (alloc_has_meta) {
const GstStructure *params;
gst_query_parse_nth_allocation_meta (query, alloc_index, &params);
if (params) {
if (gst_structure_get (params, "width", G_TYPE_UINT, &width,
"height", G_TYPE_UINT, &height, NULL)) {
GST_DEBUG ("received window size: %dx%d", width, height);
g_assert (width != 0 && height != 0);
}
}
}
gst_query_unref (query);
}
/* Update render size if needed */
render->window_width = width;
render->window_height = height;
gst_ass_render_update_render_size (render);
/* For backward compatbility, we will prefer bliting if downstream
* allocation does not support the meta. In other case we will prefer
* attaching, and will fail the negotiation in the unlikely case we are
* force to blit, but format isn't supported. */
if (upstream_has_meta) {
attach = TRUE;
} else if (caps_has_meta) {
if (alloc_has_meta) {
attach = TRUE;
} else {
/* Don't attach unless we cannot handle the format */
attach = !gst_ass_render_can_handle_caps (caps);
}
} else {
ret = gst_ass_render_can_handle_caps (caps);
}
/* If we attach, then pick the overlay caps */
if (attach) {
GST_DEBUG_OBJECT (render, "Using caps %" GST_PTR_FORMAT, overlay_caps);
/* Caps where already sent */
} else if (ret) {
GST_DEBUG_OBJECT (render, "Using caps %" GST_PTR_FORMAT, caps);
ret = gst_pad_set_caps (render->srcpad, caps);
}
render->attach_compo_to_buffer = attach;
if (!ret) {
GST_DEBUG_OBJECT (render, "negotiation failed, schedule reconfigure");
gst_pad_mark_reconfigure (render->srcpad);
} else {
g_mutex_lock (&render->ass_mutex);
ass_set_frame_size (render->ass_renderer,
render->ass_frame_width, render->ass_frame_height);
ass_set_storage_size (render->ass_renderer,
render->info.width, render->info.height);
ass_set_pixel_aspect (render->ass_renderer,
(gdouble) render->info.par_n / (gdouble) render->info.par_d);
ass_set_font_scale (render->ass_renderer, 1.0);
ass_set_hinting (render->ass_renderer, ASS_HINTING_LIGHT);
ass_set_fonts (render->ass_renderer, "Arial", "sans-serif", 1, NULL, 1);
ass_set_fonts (render->ass_renderer, NULL, "Sans", 1, NULL, 1);
ass_set_margins (render->ass_renderer, 0, 0, 0, 0);
ass_set_use_margins (render->ass_renderer, 0);
g_mutex_unlock (&render->ass_mutex);
render->renderer_init_ok = TRUE;
GST_DEBUG_OBJECT (render, "ass renderer setup complete");
}
gst_caps_unref (overlay_caps);
gst_caps_unref (caps);
if (!ret)
gst_pad_mark_reconfigure (render->srcpad);
return ret;
no_format:
{
if (caps)
gst_caps_unref (caps);
gst_pad_mark_reconfigure (render->srcpad);
return FALSE;
}
}
static gboolean
gst_ass_render_setcaps_video (GstPad * pad, GstAssRender * render,
GstCaps * caps)
{
GstVideoInfo info;
gboolean ret;
if (!gst_video_info_from_caps (&info, caps))
goto invalid_caps;
render->info = info;
ret = gst_ass_render_negotiate (render, caps);
GST_ASS_RENDER_LOCK (render);
if (!render->attach_compo_to_buffer && !gst_ass_render_can_handle_caps (caps)) {
GST_DEBUG_OBJECT (render, "unsupported caps %" GST_PTR_FORMAT, caps);
ret = FALSE;
}
GST_ASS_RENDER_UNLOCK (render);
return ret;
/* ERRORS */
invalid_caps:
{
GST_ERROR_OBJECT (render, "could not parse caps");
return FALSE;
}
}
static gboolean
gst_ass_render_setcaps_text (GstPad * pad, GstAssRender * render,
GstCaps * caps)
{
GstStructure *structure;
const GValue *value;
GstBuffer *priv;
GstMapInfo map;
gboolean ret = FALSE;
structure = gst_caps_get_structure (caps, 0);
GST_DEBUG_OBJECT (render, "text pad linked with caps: %" GST_PTR_FORMAT,
caps);
value = gst_structure_get_value (structure, "codec_data");
g_mutex_lock (&render->ass_mutex);
if (value != NULL) {
priv = gst_value_get_buffer (value);
g_return_val_if_fail (priv != NULL, FALSE);
gst_buffer_map (priv, &map, GST_MAP_READ);
if (!render->ass_track)
render->ass_track = ass_new_track (render->ass_library);
ass_process_codec_private (render->ass_track, (char *) map.data, map.size);
gst_buffer_unmap (priv, &map);
GST_DEBUG_OBJECT (render, "ass track created");
render->track_init_ok = TRUE;
ret = TRUE;
} else if (!render->ass_track) {
render->ass_track = ass_new_track (render->ass_library);
render->track_init_ok = TRUE;
ret = TRUE;
}
g_mutex_unlock (&render->ass_mutex);
return ret;
}
static void
gst_ass_render_process_text (GstAssRender * render, GstBuffer * buffer,
GstClockTime running_time, GstClockTime duration)
{
GstMapInfo map;
gdouble pts_start, pts_end;
pts_start = running_time;
pts_start /= GST_MSECOND;
pts_end = duration;
pts_end /= GST_MSECOND;
GST_DEBUG_OBJECT (render,
"Processing subtitles with running time %" GST_TIME_FORMAT
" and duration %" GST_TIME_FORMAT, GST_TIME_ARGS (running_time),
GST_TIME_ARGS (duration));
gst_buffer_map (buffer, &map, GST_MAP_READ);
g_mutex_lock (&render->ass_mutex);
ass_process_chunk (render->ass_track, (gchar *) map.data, map.size,
pts_start, pts_end);
g_mutex_unlock (&render->ass_mutex);
gst_buffer_unmap (buffer, &map);
}
static GstVideoOverlayComposition *
gst_ass_render_composite_overlay (GstAssRender * render, ASS_Image * images)
{
GstVideoOverlayComposition *composition;
GstVideoOverlayRectangle *rectangle;
GstVideoMeta *vmeta;
GstMapInfo map;
GstBuffer *buffer;
ASS_Image *image;
gint min_x, min_y;
gint max_x, max_y;
gint width, height;
gint stride;
gdouble hscale, vscale;
gpointer data;
min_x = G_MAXINT;
min_y = G_MAXINT;
max_x = 0;
max_y = 0;
/* find bounding box of all images, to limit the overlay rectangle size */
for (image = images; image; image = image->next) {
if (min_x > image->dst_x)
min_x = image->dst_x;
if (min_y > image->dst_y)
min_y = image->dst_y;
if (max_x < image->dst_x + image->w)
max_x = image->dst_x + image->w;
if (max_y < image->dst_y + image->h)
max_y = image->dst_y + image->h;
}
width = MIN (max_x - min_x, render->ass_frame_width);
height = MIN (max_y - min_y, render->ass_frame_height);
GST_DEBUG_OBJECT (render, "render overlay rectangle %dx%d%+d%+d",
width, height, min_x, min_y);
buffer = gst_buffer_new_and_alloc (4 * width * height);
if (!buffer) {
GST_ERROR_OBJECT (render, "Failed to allocate overlay buffer");
return NULL;
}
vmeta = gst_buffer_add_video_meta (buffer, GST_VIDEO_FRAME_FLAG_NONE,
GST_VIDEO_OVERLAY_COMPOSITION_FORMAT_RGB, width, height);
if (!gst_video_meta_map (vmeta, 0, &map, &data, &stride, GST_MAP_READWRITE)) {
GST_ERROR_OBJECT (render, "Failed to map overlay buffer");
gst_buffer_unref (buffer);
return NULL;
}
blit_bgra_premultiplied (render, images, data, width, height, stride,
-min_x, -min_y);
gst_video_meta_unmap (vmeta, 0, &map);
hscale = (gdouble) render->info.width / (gdouble) render->ass_frame_width;
vscale = (gdouble) render->info.height / (gdouble) render->ass_frame_height;
rectangle = gst_video_overlay_rectangle_new_raw (buffer,
hscale * min_x, vscale * min_y, hscale * width, vscale * height,
GST_VIDEO_OVERLAY_FORMAT_FLAG_PREMULTIPLIED_ALPHA);
gst_buffer_unref (buffer);
composition = gst_video_overlay_composition_new (rectangle);
gst_video_overlay_rectangle_unref (rectangle);
return composition;
}
static gboolean
gst_ass_render_push_frame (GstAssRender * render, GstBuffer * video_frame)
{
GstVideoFrame frame;
if (!render->composition)
goto done;
video_frame = gst_buffer_make_writable (video_frame);
if (render->attach_compo_to_buffer) {
gst_buffer_add_video_overlay_composition_meta (video_frame,
render->composition);
goto done;
}
if (!gst_video_frame_map (&frame, &render->info, video_frame,
GST_MAP_READWRITE)) {
GST_WARNING_OBJECT (render, "failed to map video frame for blending");
goto done;
}
gst_video_overlay_composition_blend (render->composition, &frame);
gst_video_frame_unmap (&frame);
done:
return gst_pad_push (render->srcpad, video_frame);
}
static GstFlowReturn
gst_ass_render_chain_video (GstPad * pad, GstObject * parent,
GstBuffer * buffer)
{
GstAssRender *render = GST_ASS_RENDER (parent);
GstFlowReturn ret = GST_FLOW_OK;
gboolean in_seg = FALSE;
guint64 start, stop, clip_start = 0, clip_stop = 0;
ASS_Image *ass_image;
guint n = 0;
if (gst_pad_check_reconfigure (render->srcpad)) {
if (!gst_ass_render_negotiate (render, NULL)) {
gst_pad_mark_reconfigure (render->srcpad);
if (GST_PAD_IS_FLUSHING (render->srcpad))
goto flushing;
else
goto not_negotiated;
}
}
if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
goto missing_timestamp;
/* ignore buffers that are outside of the current segment */
start = GST_BUFFER_TIMESTAMP (buffer);
if (!GST_BUFFER_DURATION_IS_VALID (buffer)) {
stop = GST_CLOCK_TIME_NONE;
} else {
stop = start + GST_BUFFER_DURATION (buffer);
}
/* segment_clip() will adjust start unconditionally to segment_start if
* no stop time is provided, so handle this ourselves */
if (stop == GST_CLOCK_TIME_NONE && start < render->video_segment.start)
goto out_of_segment;
in_seg =
gst_segment_clip (&render->video_segment, GST_FORMAT_TIME, start, stop,
&clip_start, &clip_stop);
if (!in_seg)
goto out_of_segment;
/* if the buffer is only partially in the segment, fix up stamps */
if (clip_start != start || (stop != -1 && clip_stop != stop)) {
GST_DEBUG_OBJECT (render, "clipping buffer timestamp/duration to segment");
buffer = gst_buffer_make_writable (buffer);
GST_BUFFER_TIMESTAMP (buffer) = clip_start;
if (stop != -1)
GST_BUFFER_DURATION (buffer) = clip_stop - clip_start;
}
/* now, after we've done the clipping, fix up end time if there's no
* duration (we only use those estimated values internally though, we
* don't want to set bogus values on the buffer itself) */
if (stop == -1) {
if (render->info.fps_n && render->info.fps_d) {
GST_DEBUG_OBJECT (render, "estimating duration based on framerate");
stop =
start + gst_util_uint64_scale_int (GST_SECOND, render->info.fps_d,
render->info.fps_n);
} else {
GST_WARNING_OBJECT (render, "no duration, assuming minimal duration");
stop = start + 1; /* we need to assume some interval */
}
}
wait_for_text_buf:
GST_ASS_RENDER_LOCK (render);
if (render->video_flushing)
goto flushing;
if (render->video_eos)
goto have_eos;
if (render->renderer_init_ok && render->track_init_ok && render->enable) {
/* Text pad linked, check if we have a text buffer queued */
if (render->subtitle_pending) {
GSList *subtitle_pending = render->subtitle_pending;
GstClockTime text_start = GST_CLOCK_TIME_NONE;
GstClockTime text_end = GST_CLOCK_TIME_NONE;
GstClockTime text_running_time = GST_CLOCK_TIME_NONE;
GstClockTime text_running_time_end = GST_CLOCK_TIME_NONE;
GstClockTime vid_running_time, vid_running_time_end;
gdouble timestamp;
gint changed = 0;
vid_running_time =
gst_segment_to_running_time (&render->video_segment, GST_FORMAT_TIME,
start);
vid_running_time_end =
gst_segment_to_running_time (&render->video_segment, GST_FORMAT_TIME,
stop);
GST_LOG_OBJECT (render, "V : %" GST_TIME_FORMAT " - %" GST_TIME_FORMAT,
GST_TIME_ARGS (vid_running_time),
GST_TIME_ARGS (vid_running_time_end));
if (subtitle_pending == NULL)
GST_LOG_OBJECT (render, "T : no pending subtitles");
while (subtitle_pending != NULL) {
++n;
/* if the text buffer isn't stamped right, pop it off the
* queue and display it for the current video frame only */
if (!GST_BUFFER_TIMESTAMP_IS_VALID (subtitle_pending->data) ||
!GST_BUFFER_DURATION_IS_VALID (subtitle_pending->data)) {
GSList *bad = subtitle_pending;
GST_WARNING_OBJECT (render,
"Got text buffer with invalid timestamp or duration");
gst_buffer_unref (bad->data);
bad = subtitle_pending->next;
render->subtitle_pending =
g_slist_delete_link (render->subtitle_pending, bad);
GST_ASS_RENDER_BROADCAST (render);
continue;
}
text_start = GST_BUFFER_TIMESTAMP (subtitle_pending->data);
text_end = text_start + GST_BUFFER_DURATION (subtitle_pending->data);
/* If timestamp and duration are valid */
text_running_time =
gst_segment_to_running_time (&render->subtitle_segment,
GST_FORMAT_TIME, text_start);
text_running_time_end =
gst_segment_to_running_time (&render->subtitle_segment,
GST_FORMAT_TIME, text_end);
GST_LOG_OBJECT (render, "T%u: %" GST_TIME_FORMAT " - "
"%" GST_TIME_FORMAT, n, GST_TIME_ARGS (text_running_time),
GST_TIME_ARGS (text_running_time_end));
/* Text too old */
if (text_running_time_end <= vid_running_time) {
GSList *old = subtitle_pending;
GST_DEBUG_OBJECT (render, "text buffer too old, popping");
gst_buffer_unref (old->data);
subtitle_pending = old->next;
render->subtitle_pending =
g_slist_delete_link (render->subtitle_pending, old);
GST_ASS_RENDER_BROADCAST (render);
continue;
}
if (render->need_process) {
GST_DEBUG_OBJECT (render, "process text buffer");
gst_ass_render_process_text (render, subtitle_pending->data,
text_running_time, text_running_time_end - text_running_time);
}
subtitle_pending = subtitle_pending->next;
}
if (render->need_process) {
render->need_process = FALSE;
}
GST_ASS_RENDER_UNLOCK (render);
/* libass needs timestamps in ms */
timestamp = vid_running_time / GST_MSECOND;
g_mutex_lock (&render->ass_mutex);
ass_image = ass_render_frame (render->ass_renderer, render->ass_track,
timestamp, &changed);
g_mutex_unlock (&render->ass_mutex);
if ((!ass_image || changed) && render->composition) {
GST_DEBUG_OBJECT (render, "release overlay (changed %d)", changed);
gst_ass_render_reset_composition (render);
}
if (ass_image != NULL) {
if (!render->composition)
render->composition = gst_ass_render_composite_overlay (render,
ass_image);
} else {
GST_DEBUG_OBJECT (render, "nothing to render right now");
}
/* Push the video frame */
ret = gst_ass_render_push_frame (render, buffer);
subtitle_pending = render->subtitle_pending;
while (subtitle_pending != NULL) {
text_start = GST_BUFFER_TIMESTAMP (subtitle_pending->data);
text_end = text_start + GST_BUFFER_DURATION (subtitle_pending->data);
text_running_time_end =
gst_segment_to_running_time (&render->video_segment,
GST_FORMAT_TIME, text_end);
if (text_running_time_end <= vid_running_time_end) {
GSList *old = subtitle_pending;
GST_DEBUG_OBJECT (render, "finished text buffer, popping");
GST_ASS_RENDER_LOCK (render);
gst_buffer_unref (old->data);
subtitle_pending = old->next;
render->subtitle_pending =
g_slist_delete_link (render->subtitle_pending, old);
GST_ASS_RENDER_BROADCAST (render);
GST_ASS_RENDER_UNLOCK (render);
render->need_process = TRUE;
if (g_slist_length (render->subtitle_pending) == 0) {
render->need_process = FALSE;
}
} else {
subtitle_pending = subtitle_pending->next;
}
}
} else {
gboolean wait_for_text_buf = TRUE;
if (render->subtitle_eos)
wait_for_text_buf = FALSE;
if (!render->wait_text)
wait_for_text_buf = FALSE;
/* Text pad linked, but no text buffer available - what now? */
if (render->subtitle_segment.format == GST_FORMAT_TIME) {
GstClockTime text_start_running_time, text_last_stop_running_time;
GstClockTime vid_running_time;
vid_running_time =
gst_segment_to_running_time (&render->video_segment,
GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (buffer));
text_start_running_time =
gst_segment_to_running_time (&render->subtitle_segment,
GST_FORMAT_TIME, render->subtitle_segment.start);
text_last_stop_running_time =
gst_segment_to_running_time (&render->subtitle_segment,
GST_FORMAT_TIME, render->subtitle_segment.position);
if ((GST_CLOCK_TIME_IS_VALID (text_start_running_time) &&
vid_running_time < text_start_running_time) ||
(GST_CLOCK_TIME_IS_VALID (text_last_stop_running_time) &&
vid_running_time < text_last_stop_running_time)) {
wait_for_text_buf = FALSE;
}
}
if (wait_for_text_buf) {
GST_DEBUG_OBJECT (render, "no text buffer, need to wait for one");
GST_ASS_RENDER_WAIT (render);
GST_DEBUG_OBJECT (render, "resuming");
GST_ASS_RENDER_UNLOCK (render);
goto wait_for_text_buf;
} else {
GST_ASS_RENDER_UNLOCK (render);
GST_LOG_OBJECT (render, "no need to wait for a text buffer");
ret = gst_pad_push (render->srcpad, buffer);
}
}
} else {
GST_LOG_OBJECT (render, "rendering disabled, doing buffer passthrough");
GST_ASS_RENDER_UNLOCK (render);
ret = gst_pad_push (render->srcpad, buffer);
return ret;
}
GST_DEBUG_OBJECT (render, "leaving chain for buffer %p ret=%d", buffer, ret);
/* Update last_stop */
render->video_segment.position = clip_start;
return ret;
missing_timestamp:
{
GST_WARNING_OBJECT (render, "buffer without timestamp, discarding");
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
not_negotiated:
{
GST_ASS_RENDER_UNLOCK (render);
GST_DEBUG_OBJECT (render, "not negotiated");
gst_buffer_unref (buffer);
return GST_FLOW_NOT_NEGOTIATED;
}
flushing:
{
GST_ASS_RENDER_UNLOCK (render);
GST_DEBUG_OBJECT (render, "flushing, discarding buffer");
gst_buffer_unref (buffer);
return GST_FLOW_FLUSHING;
}
have_eos:
{
GST_ASS_RENDER_UNLOCK (render);
GST_DEBUG_OBJECT (render, "eos, discarding buffer");
gst_buffer_unref (buffer);
return GST_FLOW_EOS;
}
out_of_segment:
{
GST_DEBUG_OBJECT (render, "buffer out of segment, discarding");
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
}
static GstFlowReturn
gst_ass_render_chain_text (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
GstAssRender *render = GST_ASS_RENDER (parent);
gboolean in_seg = FALSE;
guint64 clip_start = 0, clip_stop = 0;
GST_DEBUG_OBJECT (render, "entering chain for buffer %p", buffer);
GST_ASS_RENDER_LOCK (render);
if (render->subtitle_flushing) {
GST_ASS_RENDER_UNLOCK (render);
ret = GST_FLOW_FLUSHING;
GST_LOG_OBJECT (render, "text flushing");
goto beach;
}
if (render->subtitle_eos) {
GST_ASS_RENDER_UNLOCK (render);
ret = GST_FLOW_EOS;
GST_LOG_OBJECT (render, "text EOS");
goto beach;
}
if (G_LIKELY (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))) {
GstClockTime stop;
if (G_LIKELY (GST_BUFFER_DURATION_IS_VALID (buffer)))
stop = GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
else
stop = GST_CLOCK_TIME_NONE;
in_seg = gst_segment_clip (&render->subtitle_segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (buffer), stop, &clip_start, &clip_stop);
} else {
in_seg = TRUE;
}
if (in_seg) {
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
GST_BUFFER_TIMESTAMP (buffer) = clip_start;
else if (GST_BUFFER_DURATION_IS_VALID (buffer))
GST_BUFFER_DURATION (buffer) = clip_stop - clip_start;
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
render->subtitle_segment.position = clip_start;
GST_DEBUG_OBJECT (render,
"New buffer arrived for timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
render->subtitle_pending = g_slist_append (render->subtitle_pending,
gst_buffer_ref (buffer));
render->need_process = TRUE;
/* in case the video chain is waiting for a text buffer, wake it up */
GST_ASS_RENDER_BROADCAST (render);
}
GST_ASS_RENDER_UNLOCK (render);
beach:
GST_DEBUG_OBJECT (render, "leaving chain for buffer %p", buffer);
gst_buffer_unref (buffer);
return ret;
}
static void
gst_ass_render_handle_tag_sample (GstAssRender * render, GstSample * sample)
{
static const gchar *mimetypes[] = {
"application/x-font-ttf",
"application/x-font-otf",
"application/x-truetype-font"
};
static const gchar *extensions[] = {
".otf",
".ttf"
};
GstBuffer *buf;
const GstStructure *structure;
gboolean valid_mimetype, valid_extension;
guint i;
const gchar *filename;
buf = gst_sample_get_buffer (sample);
structure = gst_sample_get_info (sample);
if (!buf || !structure)
return;
valid_mimetype = FALSE;
valid_extension = FALSE;
for (i = 0; i < G_N_ELEMENTS (mimetypes); i++) {
if (gst_structure_has_name (structure, mimetypes[i])) {
valid_mimetype = TRUE;
break;
}
}
filename = gst_structure_get_string (structure, "filename");
if (!filename)
return;
if (!valid_mimetype) {
guint len = strlen (filename);
const gchar *extension = filename + len - 4;
for (i = 0; i < G_N_ELEMENTS (extensions); i++) {
if (g_ascii_strcasecmp (extension, extensions[i]) == 0) {
valid_extension = TRUE;
break;
}
}
}
if (valid_mimetype || valid_extension) {
GstMapInfo map;
g_mutex_lock (&render->ass_mutex);
gst_buffer_map (buf, &map, GST_MAP_READ);
ass_add_font (render->ass_library, (gchar *) filename,
(gchar *) map.data, map.size);
gst_buffer_unmap (buf, &map);
GST_DEBUG_OBJECT (render, "registered new font %s", filename);
g_mutex_unlock (&render->ass_mutex);
}
}
static void
gst_ass_render_handle_tags (GstAssRender * render, GstTagList * taglist)
{
guint tag_size;
if (!taglist)
return;
tag_size = gst_tag_list_get_tag_size (taglist, GST_TAG_ATTACHMENT);
if (tag_size > 0 && render->embeddedfonts) {
guint index;
GstSample *sample;
GST_DEBUG_OBJECT (render, "TAG event has attachments");
for (index = 0; index < tag_size; index++) {
if (gst_tag_list_get_sample_index (taglist, GST_TAG_ATTACHMENT, index,
&sample)) {
gst_ass_render_handle_tag_sample (render, sample);
gst_sample_unref (sample);
}
}
}
}
static gboolean
gst_ass_render_event_video (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean ret = FALSE;
GstAssRender *render = GST_ASS_RENDER (parent);
GST_DEBUG_OBJECT (pad, "received video event %" GST_PTR_FORMAT, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_ass_render_setcaps_video (pad, render, caps);
gst_event_unref (event);
break;
}
case GST_EVENT_SEGMENT:
{
GstSegment segment;
GST_DEBUG_OBJECT (render, "received new segment");
gst_event_copy_segment (event, &segment);
if (segment.format == GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (render, "VIDEO SEGMENT now: %" GST_SEGMENT_FORMAT,
&render->video_segment);
render->video_segment = segment;
GST_DEBUG_OBJECT (render, "VIDEO SEGMENT after: %" GST_SEGMENT_FORMAT,
&render->video_segment);
ret = gst_pad_event_default (pad, parent, event);
} else {
GST_ELEMENT_WARNING (render, STREAM, MUX, (NULL),
("received non-TIME newsegment event on video input"));
ret = FALSE;
gst_event_unref (event);
}
break;
}
case GST_EVENT_TAG:
{
GstTagList *taglist = NULL;
/* tag events may contain attachments which might be fonts */
GST_DEBUG_OBJECT (render, "got TAG event");
gst_event_parse_tag (event, &taglist);
gst_ass_render_handle_tags (render, taglist);
ret = gst_pad_event_default (pad, parent, event);
break;
}
case GST_EVENT_EOS:
GST_ASS_RENDER_LOCK (render);
GST_INFO_OBJECT (render, "video EOS");
render->video_eos = TRUE;
GST_ASS_RENDER_UNLOCK (render);
ret = gst_pad_event_default (pad, parent, event);
break;
case GST_EVENT_FLUSH_START:
GST_ASS_RENDER_LOCK (render);
GST_INFO_OBJECT (render, "video flush start");
render->video_flushing = TRUE;
GST_ASS_RENDER_BROADCAST (render);
GST_ASS_RENDER_UNLOCK (render);
ret = gst_pad_event_default (pad, parent, event);
break;
case GST_EVENT_FLUSH_STOP:
GST_ASS_RENDER_LOCK (render);
GST_INFO_OBJECT (render, "video flush stop");
render->video_flushing = FALSE;
render->video_eos = FALSE;
gst_segment_init (&render->video_segment, GST_FORMAT_TIME);
GST_ASS_RENDER_UNLOCK (render);
ret = gst_pad_event_default (pad, parent, event);
break;
default:
ret = gst_pad_event_default (pad, parent, event);
break;
}
return ret;
}
static gboolean
gst_ass_render_query_video (GstPad * pad, GstObject * parent, GstQuery * query)
{
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps =
gst_ass_render_get_videosink_caps (pad, (GstAssRender *) parent,
filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
static gboolean
gst_ass_render_event_text (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean ret = FALSE;
GstAssRender *render = GST_ASS_RENDER (parent);
GST_DEBUG_OBJECT (pad, "received text event %" GST_PTR_FORMAT, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_ass_render_setcaps_text (pad, render, caps);
gst_event_unref (event);
break;
}
case GST_EVENT_SEGMENT:
{
GstSegment segment;
GST_ASS_RENDER_LOCK (render);
render->subtitle_eos = FALSE;
GST_ASS_RENDER_UNLOCK (render);
gst_event_copy_segment (event, &segment);
GST_ASS_RENDER_LOCK (render);
if (segment.format == GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (render, "TEXT SEGMENT now: %" GST_SEGMENT_FORMAT,
&render->subtitle_segment);
render->subtitle_segment = segment;
GST_DEBUG_OBJECT (render,
"TEXT SEGMENT after: %" GST_SEGMENT_FORMAT,
&render->subtitle_segment);
} else {
GST_ELEMENT_WARNING (render, STREAM, MUX, (NULL),
("received non-TIME newsegment event on subtitle input"));
}
gst_event_unref (event);
ret = TRUE;
/* wake up the video chain, it might be waiting for a text buffer or
* a text segment update */
GST_ASS_RENDER_BROADCAST (render);
GST_ASS_RENDER_UNLOCK (render);
break;
}
case GST_EVENT_GAP:{
GstClockTime start, duration;
gst_event_parse_gap (event, &start, &duration);
if (GST_CLOCK_TIME_IS_VALID (duration))
start += duration;
/* we do not expect another buffer until after gap,
* so that is our position now */
GST_ASS_RENDER_LOCK (render);
render->subtitle_segment.position = start;
/* wake up the video chain, it might be waiting for a text buffer or
* a text segment update */
GST_ASS_RENDER_BROADCAST (render);
GST_ASS_RENDER_UNLOCK (render);
gst_event_unref (event);
ret = TRUE;
break;
}
case GST_EVENT_FLUSH_STOP:
g_mutex_lock (&render->ass_mutex);
if (render->ass_track) {
ass_flush_events (render->ass_track);
}
g_mutex_unlock (&render->ass_mutex);
GST_ASS_RENDER_LOCK (render);
GST_INFO_OBJECT (render, "text flush stop");
render->subtitle_flushing = FALSE;
render->subtitle_eos = FALSE;
gst_ass_render_pop_text (render);
gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME);
GST_ASS_RENDER_UNLOCK (render);
gst_event_unref (event);
ret = TRUE;
break;
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (render, "text flush start");
GST_ASS_RENDER_LOCK (render);
render->subtitle_flushing = TRUE;
GST_ASS_RENDER_BROADCAST (render);
GST_ASS_RENDER_UNLOCK (render);
gst_event_unref (event);
ret = TRUE;
break;
case GST_EVENT_EOS:
GST_ASS_RENDER_LOCK (render);
render->subtitle_eos = TRUE;
GST_INFO_OBJECT (render, "text EOS");
/* wake up the video chain, it might be waiting for a text buffer or
* a text segment update */
GST_ASS_RENDER_BROADCAST (render);
GST_ASS_RENDER_UNLOCK (render);
gst_event_unref (event);
ret = TRUE;
break;
case GST_EVENT_TAG:
{
GstTagList *taglist = NULL;
/* tag events may contain attachments which might be fonts */
GST_DEBUG_OBJECT (render, "got TAG event");
gst_event_parse_tag (event, &taglist);
gst_ass_render_handle_tags (render, taglist);
ret = gst_pad_event_default (pad, parent, event);
break;
}
default:
ret = gst_pad_event_default (pad, parent, event);
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_ass_render_debug, "assrender",
0, "ASS/SSA subtitle renderer");
GST_DEBUG_CATEGORY_INIT (gst_ass_render_lib_debug, "assrender_library",
0, "ASS/SSA subtitle renderer library");
return gst_element_register (plugin, "assrender",
GST_RANK_PRIMARY, GST_TYPE_ASS_RENDER);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
assrender,
"ASS/SSA subtitle renderer",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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