gstreamer/gst/inter/gstintervideosrc.c

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/* GStreamer
* Copyright (C) 2011 David A. Schleef <ds@schleef.org>
*
* 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 Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
/**
* SECTION:element-gstintervideosrc
*
* The intervideosrc element is a video source element. It is used
* in connection with a intervideosink element in a different pipeline,
* similar to interaudiosink and interaudiosrc.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v intervideosrc ! queue ! xvimagesink
* ]|
*
* The intersubsrc element cannot be used effectively with gst-launch,
* as it requires a second pipeline in the application to send subtitles.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbasesrc.h>
#include <gst/video/video.h>
#include "gstintervideosrc.h"
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_inter_video_src_debug_category);
#define GST_CAT_DEFAULT gst_inter_video_src_debug_category
/* prototypes */
static void gst_inter_video_src_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_inter_video_src_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static void gst_inter_video_src_finalize (GObject * object);
static GstCaps *gst_inter_video_src_get_caps (GstBaseSrc * src,
GstCaps * filter);
static gboolean gst_inter_video_src_set_caps (GstBaseSrc * src, GstCaps * caps);
static GstCaps *gst_inter_video_src_fixate (GstBaseSrc * src, GstCaps * caps);
static gboolean gst_inter_video_src_start (GstBaseSrc * src);
static gboolean gst_inter_video_src_stop (GstBaseSrc * src);
static void
gst_inter_video_src_get_times (GstBaseSrc * src, GstBuffer * buffer,
GstClockTime * start, GstClockTime * end);
static GstFlowReturn
gst_inter_video_src_create (GstBaseSrc * src, guint64 offset, guint size,
GstBuffer ** buf);
enum
{
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PROP_0,
PROP_CHANNEL,
PROP_TIMEOUT
};
#define DEFAULT_CHANNEL ("default")
#define DEFAULT_TIMEOUT (GST_SECOND)
/* pad templates */
static GstStaticPadTemplate gst_inter_video_src_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (GST_VIDEO_FORMATS_ALL))
);
/* class initialization */
#define parent_class gst_inter_video_src_parent_class
G_DEFINE_TYPE (GstInterVideoSrc, gst_inter_video_src, GST_TYPE_BASE_SRC);
static void
gst_inter_video_src_class_init (GstInterVideoSrcClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstBaseSrcClass *base_src_class = GST_BASE_SRC_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_inter_video_src_debug_category, "intervideosrc",
0, "debug category for intervideosrc element");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_inter_video_src_src_template));
gst_element_class_set_static_metadata (element_class,
"Internal video source",
"Source/Video",
"Virtual video source for internal process communication",
"David Schleef <ds@schleef.org>");
gobject_class->set_property = gst_inter_video_src_set_property;
gobject_class->get_property = gst_inter_video_src_get_property;
gobject_class->finalize = gst_inter_video_src_finalize;
base_src_class->get_caps = GST_DEBUG_FUNCPTR (gst_inter_video_src_get_caps);
base_src_class->set_caps = GST_DEBUG_FUNCPTR (gst_inter_video_src_set_caps);
base_src_class->fixate = GST_DEBUG_FUNCPTR (gst_inter_video_src_fixate);
base_src_class->start = GST_DEBUG_FUNCPTR (gst_inter_video_src_start);
base_src_class->stop = GST_DEBUG_FUNCPTR (gst_inter_video_src_stop);
base_src_class->get_times = GST_DEBUG_FUNCPTR (gst_inter_video_src_get_times);
base_src_class->create = GST_DEBUG_FUNCPTR (gst_inter_video_src_create);
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g_object_class_install_property (gobject_class, PROP_CHANNEL,
g_param_spec_string ("channel", "Channel",
"Channel name to match inter src and sink elements",
DEFAULT_CHANNEL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TIMEOUT,
g_param_spec_uint64 ("timeout", "Timeout",
"Timeout after which to start outputting black frames",
0, G_MAXUINT64, DEFAULT_TIMEOUT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_inter_video_src_init (GstInterVideoSrc * intervideosrc)
{
gst_base_src_set_format (GST_BASE_SRC (intervideosrc), GST_FORMAT_TIME);
gst_base_src_set_live (GST_BASE_SRC (intervideosrc), TRUE);
intervideosrc->channel = g_strdup (DEFAULT_CHANNEL);
intervideosrc->timeout = DEFAULT_TIMEOUT;
}
void
gst_inter_video_src_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);
switch (property_id) {
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case PROP_CHANNEL:
g_free (intervideosrc->channel);
intervideosrc->channel = g_value_dup_string (value);
break;
case PROP_TIMEOUT:
intervideosrc->timeout = g_value_get_uint64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_inter_video_src_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);
switch (property_id) {
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case PROP_CHANNEL:
g_value_set_string (value, intervideosrc->channel);
break;
case PROP_TIMEOUT:
g_value_set_uint64 (value, intervideosrc->timeout);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_inter_video_src_finalize (GObject * object)
{
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GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (object);
/* clean up object here */
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g_free (intervideosrc->channel);
G_OBJECT_CLASS (gst_inter_video_src_parent_class)->finalize (object);
}
static GstCaps *
gst_inter_video_src_get_caps (GstBaseSrc * src, GstCaps * filter)
{
GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);
GstCaps *caps;
GST_DEBUG_OBJECT (intervideosrc, "get_caps");
if (!intervideosrc->surface)
return GST_BASE_SRC_CLASS (parent_class)->get_caps (src, filter);
g_mutex_lock (&intervideosrc->surface->mutex);
if (intervideosrc->surface->video_info.finfo) {
caps = gst_video_info_to_caps (&intervideosrc->surface->video_info);
gst_caps_set_simple (caps, "framerate", GST_TYPE_FRACTION_RANGE, 1,
G_MAXINT, G_MAXINT, 1, NULL);
if (filter) {
GstCaps *tmp;
tmp = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
caps = tmp;
}
} else {
caps = NULL;
}
g_mutex_unlock (&intervideosrc->surface->mutex);
if (caps)
return caps;
else
return GST_BASE_SRC_CLASS (parent_class)->get_caps (src, filter);
}
static gboolean
gst_inter_video_src_set_caps (GstBaseSrc * base, GstCaps * caps)
{
GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (base);
GstVideoConverter *converter;
GstVideoFrame src_frame, dest_frame;
GstBuffer *src, *dest;
GstVideoInfo black_info;
GST_DEBUG_OBJECT (intervideosrc, "set_caps");
if (!gst_video_info_from_caps (&intervideosrc->info, caps)) {
GST_ERROR_OBJECT (intervideosrc, "Failed to parse caps %" GST_PTR_FORMAT,
caps);
return FALSE;
}
/* Create a black frame */
gst_buffer_replace (&intervideosrc->black_frame, NULL);
gst_video_info_set_format (&black_info, GST_VIDEO_FORMAT_ARGB,
intervideosrc->info.width, intervideosrc->info.height);
black_info.fps_n = intervideosrc->info.fps_n;
black_info.fps_d = intervideosrc->info.fps_d;
src = gst_buffer_new_and_alloc (black_info.size);
dest = gst_buffer_new_and_alloc (intervideosrc->info.size);
gst_buffer_memset (src, 0, 0, black_info.size);
gst_video_frame_map (&src_frame, &black_info, src, GST_MAP_READ);
gst_video_frame_map (&dest_frame, &intervideosrc->info, dest, GST_MAP_WRITE);
converter = gst_video_converter_new (&black_info, &intervideosrc->info, NULL);
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gst_video_converter_frame (converter, &src_frame, &dest_frame);
gst_video_converter_free (converter);
gst_video_frame_unmap (&src_frame);
gst_video_frame_unmap (&dest_frame);
gst_buffer_unref (src);
intervideosrc->black_frame = dest;
return TRUE;
}
static gboolean
gst_inter_video_src_start (GstBaseSrc * src)
{
GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);
GST_DEBUG_OBJECT (intervideosrc, "start");
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intervideosrc->surface = gst_inter_surface_get (intervideosrc->channel);
intervideosrc->timestamp_offset = 0;
intervideosrc->n_frames = 0;
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return TRUE;
}
static gboolean
gst_inter_video_src_stop (GstBaseSrc * src)
{
GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);
GST_DEBUG_OBJECT (intervideosrc, "stop");
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gst_inter_surface_unref (intervideosrc->surface);
intervideosrc->surface = NULL;
gst_buffer_replace (&intervideosrc->black_frame, NULL);
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return TRUE;
}
static void
gst_inter_video_src_get_times (GstBaseSrc * src, GstBuffer * buffer,
GstClockTime * start, GstClockTime * end)
{
GST_DEBUG_OBJECT (src, "get_times");
/* for live sources, sync on the timestamp of the buffer */
if (gst_base_src_is_live (src)) {
GstClockTime timestamp = GST_BUFFER_PTS (buffer);
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
/* get duration to calculate end time */
GstClockTime duration = GST_BUFFER_DURATION (buffer);
if (GST_CLOCK_TIME_IS_VALID (duration)) {
*end = timestamp + duration;
}
*start = timestamp;
}
} else {
*start = -1;
*end = -1;
}
}
static GstFlowReturn
gst_inter_video_src_create (GstBaseSrc * src, guint64 offset, guint size,
GstBuffer ** buf)
{
GstInterVideoSrc *intervideosrc = GST_INTER_VIDEO_SRC (src);
GstCaps *caps;
GstBuffer *buffer;
guint64 frames;
gboolean is_gap = FALSE;
GST_DEBUG_OBJECT (intervideosrc, "create");
caps = NULL;
buffer = NULL;
frames = gst_util_uint64_scale_ceil (intervideosrc->timeout,
GST_VIDEO_INFO_FPS_N (&intervideosrc->info),
GST_VIDEO_INFO_FPS_D (&intervideosrc->info) * GST_SECOND);
g_mutex_lock (&intervideosrc->surface->mutex);
if (intervideosrc->surface->video_info.finfo) {
GstVideoInfo tmp_info = intervideosrc->surface->video_info;
/* We negotiate the framerate ourselves */
tmp_info.fps_n = intervideosrc->info.fps_n;
tmp_info.fps_d = intervideosrc->info.fps_d;
if (intervideosrc->info.flags & GST_VIDEO_FLAG_VARIABLE_FPS)
tmp_info.flags |= GST_VIDEO_FLAG_VARIABLE_FPS;
else
tmp_info.flags &= ~GST_VIDEO_FLAG_VARIABLE_FPS;
if (!gst_video_info_is_equal (&tmp_info, &intervideosrc->info)) {
caps = gst_video_info_to_caps (&tmp_info);
intervideosrc->timestamp_offset +=
gst_util_uint64_scale (GST_SECOND * intervideosrc->n_frames,
GST_VIDEO_INFO_FPS_D (&intervideosrc->info),
GST_VIDEO_INFO_FPS_N (&intervideosrc->info));
intervideosrc->n_frames = 0;
}
}
if (intervideosrc->surface->video_buffer) {
/* We have a buffer to push */
buffer = gst_buffer_ref (intervideosrc->surface->video_buffer);
/* Can only be true if timeout > 0 */
if (intervideosrc->surface->video_buffer_count == frames) {
gst_buffer_unref (intervideosrc->surface->video_buffer);
intervideosrc->surface->video_buffer = NULL;
}
}
if (intervideosrc->surface->video_buffer_count != 0 &&
intervideosrc->surface->video_buffer_count != (frames + 1)) {
/* This is a repeat of the stored buffer or of a black frame */
is_gap = TRUE;
}
intervideosrc->surface->video_buffer_count++;
g_mutex_unlock (&intervideosrc->surface->mutex);
if (caps) {
gboolean ret;
GstStructure *s;
GstCaps *downstream_caps;
GstCaps *tmp, *negotiated_caps;
gint fps_n = 0, fps_d = 1;
/* Negotiate a framerate with downstream */
downstream_caps = gst_pad_get_allowed_caps (GST_BASE_SRC_PAD (src));
/* Remove all framerates */
tmp = gst_caps_copy (caps);
s = gst_caps_get_structure (tmp, 0);
gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d);
if (fps_n == 0)
gst_structure_get_fraction (s, "max-framerate", &fps_n, &fps_d);
gst_structure_remove_field (s, "framerate");
gst_structure_remove_field (s, "max-framerate");
negotiated_caps =
gst_caps_intersect_full (downstream_caps, tmp,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
gst_caps_unref (downstream_caps);
if (gst_caps_is_empty (negotiated_caps)) {
GST_ERROR_OBJECT (src, "Failed to negotiate caps %" GST_PTR_FORMAT, caps);
if (buffer)
gst_buffer_unref (buffer);
gst_caps_unref (caps);
return GST_FLOW_NOT_NEGOTIATED;
}
gst_caps_unref (caps);
caps = NULL;
/* Prefer what the source produces, otherwise 30 fps */
if (fps_n == 0) {
fps_n = 30;
fps_d = 1;
}
negotiated_caps = gst_caps_truncate (negotiated_caps);
s = gst_caps_get_structure (negotiated_caps, 0);
if (!gst_structure_has_field (s, "framerate"))
gst_structure_set (s, "framerate", GST_TYPE_FRACTION, fps_n, fps_d, NULL);
else
gst_structure_fixate_field_nearest_fraction (s, "framerate", fps_n,
fps_d);
ret = gst_base_src_set_caps (src, negotiated_caps);
if (!ret) {
GST_ERROR_OBJECT (src, "Failed to set caps %" GST_PTR_FORMAT,
negotiated_caps);
if (buffer)
gst_buffer_unref (buffer);
gst_caps_unref (negotiated_caps);
return GST_FLOW_NOT_NEGOTIATED;
}
gst_caps_unref (negotiated_caps);
}
if (buffer == NULL) {
GST_DEBUG_OBJECT (intervideosrc, "Creating black frame");
buffer = gst_buffer_copy (intervideosrc->black_frame);
}
buffer = gst_buffer_make_writable (buffer);
if (is_gap)
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_GAP);
GST_BUFFER_PTS (buffer) = intervideosrc->timestamp_offset +
gst_util_uint64_scale (GST_SECOND * intervideosrc->n_frames,
GST_VIDEO_INFO_FPS_D (&intervideosrc->info),
GST_VIDEO_INFO_FPS_N (&intervideosrc->info));
GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
GST_DEBUG_OBJECT (intervideosrc, "create ts %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
GST_BUFFER_DURATION (buffer) = intervideosrc->timestamp_offset +
gst_util_uint64_scale (GST_SECOND * (intervideosrc->n_frames + 1),
GST_VIDEO_INFO_FPS_D (&intervideosrc->info),
GST_VIDEO_INFO_FPS_N (&intervideosrc->info)) - GST_BUFFER_PTS (buffer);
GST_BUFFER_OFFSET (buffer) = intervideosrc->n_frames;
GST_BUFFER_OFFSET_END (buffer) = -1;
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
if (intervideosrc->n_frames == 0) {
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
}
intervideosrc->n_frames++;
*buf = buffer;
return GST_FLOW_OK;
}
static GstCaps *
gst_inter_video_src_fixate (GstBaseSrc * src, GstCaps * caps)
{
GstStructure *structure;
GST_DEBUG_OBJECT (src, "fixate");
caps = gst_caps_make_writable (caps);
caps = gst_caps_truncate (caps);
structure = gst_caps_get_structure (caps, 0);
gst_structure_fixate_field_string (structure, "format", "I420");
gst_structure_fixate_field_nearest_int (structure, "width", 320);
gst_structure_fixate_field_nearest_int (structure, "height", 240);
gst_structure_fixate_field_nearest_fraction (structure, "framerate", 30, 1);
if (gst_structure_has_field (structure, "pixel-aspect-ratio"))
gst_structure_fixate_field_nearest_fraction (structure,
"pixel-aspect-ratio", 1, 1);
if (gst_structure_has_field (structure, "color-matrix"))
gst_structure_fixate_field_string (structure, "color-matrix", "sdtv");
if (gst_structure_has_field (structure, "chroma-site"))
gst_structure_fixate_field_string (structure, "chroma-site", "mpeg2");
if (gst_structure_has_field (structure, "interlaced"))
gst_structure_fixate_field_boolean (structure, "interlaced", FALSE);
return caps;
}