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gstreamer/ext/assrender/gstassrender.c
Matthew Waters 84718775a2 ass: avoid infinite unref loop with bad data 
A classic case of not updating the next item to iterate after deleting
it from the singly linked list.

Only ever hit with a text buffer with GST_CLOCK_TIME_NONE for either the
timestamp or duration.
2019-10-07 00:07:36 +11:00

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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_PTR_FORMAT, bad->data);
gst_buffer_unref (bad->data);
subtitle_pending = bad->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_PTR_FORMAT, old->data);
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_PTR_FORMAT, old->data);
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 %" GST_PTR_FORMAT,
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 %" GST_PTR_FORMAT, 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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