gstreamer/ext/jpeg/gstjpegenc.c
Wim Taymans be4f60b062 jpeg: port to 0.11
Also disable smoke for now.
2011-08-17 15:39:27 +02:00

714 lines
21 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-jpegenc
*
* Encodes jpeg images.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch videotestsrc num-buffers=50 ! video/x-raw-yuv, framerate='(fraction)'5/1 ! jpegenc ! avimux ! filesink location=mjpeg.avi
* ]| a pipeline to mux 5 JPEG frames per second into a 10 sec. long motion jpeg
* avi.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstjpegenc.h"
#include "gstjpeg.h"
#include <gst/video/video.h>
/* experimental */
/* setting smoothig seems to have no effect in libjepeg
#define ENABLE_SMOOTHING 1
*/
GST_DEBUG_CATEGORY_STATIC (jpegenc_debug);
#define GST_CAT_DEFAULT jpegenc_debug
#define JPEG_DEFAULT_QUALITY 85
#define JPEG_DEFAULT_SMOOTHING 0
#define JPEG_DEFAULT_IDCT_METHOD JDCT_FASTEST
/* JpegEnc signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_QUALITY,
PROP_SMOOTHING,
PROP_IDCT_METHOD
};
static void gst_jpegenc_reset (GstJpegEnc * enc);
static void gst_jpegenc_finalize (GObject * object);
static GstFlowReturn gst_jpegenc_chain (GstPad * pad, GstBuffer * buf);
static gboolean gst_jpegenc_sink_event (GstPad * pad, GstEvent * event);
static GstCaps *gst_jpegenc_getcaps (GstPad * pad, GstCaps * filter);
static void gst_jpegenc_resync (GstJpegEnc * jpegenc);
static void gst_jpegenc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_jpegenc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstStateChangeReturn gst_jpegenc_change_state (GstElement * element,
GstStateChange transition);
#define gst_jpegenc_parent_class parent_class
G_DEFINE_TYPE (GstJpegEnc, gst_jpegenc, GST_TYPE_ELEMENT);
/* *INDENT-OFF* */
static GstStaticPadTemplate gst_jpegenc_sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE
("{ I420, YV12, YUY2, UYVY, Y41B, Y42B, YVYU, Y444, "
"RGB, BGR, RGBx, xRGB, BGRx, xBGR, GRAY8 }"))
);
/* *INDENT-ON* */
static GstStaticPadTemplate gst_jpegenc_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/jpeg, "
"width = (int) [ 16, 65535 ], "
"height = (int) [ 16, 65535 ], " "framerate = (fraction) [ 0/1, MAX ]")
);
static void
gst_jpegenc_class_init (GstJpegEncClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = gst_jpegenc_finalize;
gobject_class->set_property = gst_jpegenc_set_property;
gobject_class->get_property = gst_jpegenc_get_property;
g_object_class_install_property (gobject_class, PROP_QUALITY,
g_param_spec_int ("quality", "Quality", "Quality of encoding",
0, 100, JPEG_DEFAULT_QUALITY,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
#ifdef ENABLE_SMOOTHING
/* disabled, since it doesn't seem to work */
g_object_class_install_property (gobject_class, PROP_SMOOTHING,
g_param_spec_int ("smoothing", "Smoothing", "Smoothing factor",
0, 100, JPEG_DEFAULT_SMOOTHING,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
#endif
g_object_class_install_property (gobject_class, PROP_IDCT_METHOD,
g_param_spec_enum ("idct-method", "IDCT Method",
"The IDCT algorithm to use", GST_TYPE_IDCT_METHOD,
JPEG_DEFAULT_IDCT_METHOD,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state = gst_jpegenc_change_state;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_jpegenc_sink_pad_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_jpegenc_src_pad_template));
gst_element_class_set_details_simple (gstelement_class, "JPEG image encoder",
"Codec/Encoder/Image",
"Encode images in JPEG format", "Wim Taymans <wim.taymans@tvd.be>");
GST_DEBUG_CATEGORY_INIT (jpegenc_debug, "jpegenc", 0,
"JPEG encoding element");
}
static void
ensure_memory (GstJpegEnc * jpegenc)
{
GstMemory *new_memory;
gsize old_size, desired_size, new_size;
guint8 *new_data;
old_size = jpegenc->output_size;
if (old_size == 0)
desired_size = jpegenc->bufsize;
else
desired_size = old_size * 2;
/* Our output memory wasn't big enough.
* Make a new memory that's twice the size, */
new_memory = gst_allocator_alloc (NULL, desired_size, 3);
new_data = gst_memory_map (new_memory, &new_size, NULL, GST_MAP_READWRITE);
/* copy previous data if any */
if (jpegenc->output_mem) {
memcpy (new_data, jpegenc->output_data, old_size);
gst_memory_unmap (jpegenc->output_mem, jpegenc->output_data,
jpegenc->output_size);
gst_memory_unref (jpegenc->output_mem);
}
/* drop it into place, */
jpegenc->output_mem = new_memory;
jpegenc->output_data = new_data;
jpegenc->output_size = new_size;
/* and last, update libjpeg on where to work. */
jpegenc->jdest.next_output_byte = new_data + old_size;
jpegenc->jdest.free_in_buffer = new_size - old_size;
}
static void
gst_jpegenc_init_destination (j_compress_ptr cinfo)
{
GST_DEBUG ("gst_jpegenc_chain: init_destination");
}
static boolean
gst_jpegenc_flush_destination (j_compress_ptr cinfo)
{
GstJpegEnc *jpegenc = (GstJpegEnc *) (cinfo->client_data);
GST_DEBUG_OBJECT (jpegenc,
"gst_jpegenc_chain: flush_destination: buffer too small");
ensure_memory (jpegenc);
return TRUE;
}
static void
gst_jpegenc_term_destination (j_compress_ptr cinfo)
{
GstJpegEnc *jpegenc = (GstJpegEnc *) (cinfo->client_data);
GST_DEBUG_OBJECT (jpegenc, "gst_jpegenc_chain: term_source");
/* Trim the buffer size. we will push it in the chain function */
gst_memory_unmap (jpegenc->output_mem, jpegenc->output_data,
jpegenc->output_size - jpegenc->jdest.free_in_buffer);
jpegenc->output_data = NULL;
jpegenc->output_size = 0;
}
static void
gst_jpegenc_init (GstJpegEnc * jpegenc)
{
/* create the sink and src pads */
jpegenc->sinkpad =
gst_pad_new_from_static_template (&gst_jpegenc_sink_pad_template, "sink");
gst_pad_set_chain_function (jpegenc->sinkpad,
GST_DEBUG_FUNCPTR (gst_jpegenc_chain));
gst_pad_set_getcaps_function (jpegenc->sinkpad,
GST_DEBUG_FUNCPTR (gst_jpegenc_getcaps));
gst_pad_set_event_function (jpegenc->sinkpad,
GST_DEBUG_FUNCPTR (gst_jpegenc_sink_event));
gst_element_add_pad (GST_ELEMENT (jpegenc), jpegenc->sinkpad);
jpegenc->srcpad =
gst_pad_new_from_static_template (&gst_jpegenc_src_pad_template, "src");
gst_pad_use_fixed_caps (jpegenc->srcpad);
gst_element_add_pad (GST_ELEMENT (jpegenc), jpegenc->srcpad);
/* reset the initial video state */
gst_video_info_init (&jpegenc->info);
/* setup jpeglib */
memset (&jpegenc->cinfo, 0, sizeof (jpegenc->cinfo));
memset (&jpegenc->jerr, 0, sizeof (jpegenc->jerr));
jpegenc->cinfo.err = jpeg_std_error (&jpegenc->jerr);
jpeg_create_compress (&jpegenc->cinfo);
jpegenc->jdest.init_destination = gst_jpegenc_init_destination;
jpegenc->jdest.empty_output_buffer = gst_jpegenc_flush_destination;
jpegenc->jdest.term_destination = gst_jpegenc_term_destination;
jpegenc->cinfo.dest = &jpegenc->jdest;
jpegenc->cinfo.client_data = jpegenc;
/* init properties */
jpegenc->quality = JPEG_DEFAULT_QUALITY;
jpegenc->smoothing = JPEG_DEFAULT_SMOOTHING;
jpegenc->idct_method = JPEG_DEFAULT_IDCT_METHOD;
gst_jpegenc_reset (jpegenc);
}
static void
gst_jpegenc_reset (GstJpegEnc * enc)
{
gint i, j;
g_free (enc->line[0]);
g_free (enc->line[1]);
g_free (enc->line[2]);
enc->line[0] = NULL;
enc->line[1] = NULL;
enc->line[2] = NULL;
for (i = 0; i < 3; i++) {
for (j = 0; j < 4 * DCTSIZE; j++) {
g_free (enc->row[i][j]);
enc->row[i][j] = NULL;
}
}
gst_video_info_init (&enc->info);
}
static void
gst_jpegenc_finalize (GObject * object)
{
GstJpegEnc *filter = GST_JPEGENC (object);
jpeg_destroy_compress (&filter->cinfo);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstCaps *
gst_jpegenc_getcaps (GstPad * pad, GstCaps * filter)
{
GstJpegEnc *jpegenc = GST_JPEGENC (gst_pad_get_parent (pad));
GstCaps *caps, *othercaps;
const GstCaps *templ;
gint i, j;
GstStructure *structure = NULL;
/* we want to proxy properties like width, height and framerate from the
other end of the element */
othercaps = gst_pad_peer_get_caps (jpegenc->srcpad, filter);
if (othercaps == NULL ||
gst_caps_is_empty (othercaps) || gst_caps_is_any (othercaps)) {
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
goto done;
}
caps = gst_caps_new_empty ();
templ = gst_pad_get_pad_template_caps (pad);
for (i = 0; i < gst_caps_get_size (templ); i++) {
/* pick fields from peer caps */
for (j = 0; j < gst_caps_get_size (othercaps); j++) {
GstStructure *s = gst_caps_get_structure (othercaps, j);
const GValue *val;
structure = gst_structure_copy (gst_caps_get_structure (templ, i));
if ((val = gst_structure_get_value (s, "width")))
gst_structure_set_value (structure, "width", val);
if ((val = gst_structure_get_value (s, "height")))
gst_structure_set_value (structure, "height", val);
if ((val = gst_structure_get_value (s, "framerate")))
gst_structure_set_value (structure, "framerate", val);
gst_caps_merge_structure (caps, structure);
}
}
done:
gst_caps_replace (&othercaps, NULL);
gst_object_unref (jpegenc);
return caps;
}
static gboolean
gst_jpegenc_setcaps (GstJpegEnc * enc, GstCaps * caps)
{
GstVideoInfo info;
gint i;
GstCaps *othercaps;
gboolean ret;
const GstVideoFormatInfo *vinfo;
/* get info from caps */
if (!gst_video_info_from_caps (&info, caps))
goto refuse_caps;
/* store input description */
enc->info = info;
vinfo = info.finfo;
/* prepare a cached image description */
enc->channels = 3 + (GST_VIDEO_FORMAT_INFO_HAS_ALPHA (vinfo) ? 1 : 0);
/* ... but any alpha is disregarded in encoding */
if (GST_VIDEO_FORMAT_INFO_IS_GRAY (vinfo))
enc->channels = 1;
else
enc->channels = 3;
enc->h_max_samp = 0;
enc->v_max_samp = 0;
for (i = 0; i < enc->channels; ++i) {
enc->cwidth[i] = GST_VIDEO_INFO_COMP_WIDTH (&info, i);
enc->cheight[i] = GST_VIDEO_INFO_COMP_HEIGHT (&info, i);
enc->inc[i] = GST_VIDEO_INFO_COMP_PSTRIDE (&info, i);
enc->h_samp[i] = GST_ROUND_UP_4 (info.width) / enc->cwidth[i];
enc->h_max_samp = MAX (enc->h_max_samp, enc->h_samp[i]);
enc->v_samp[i] = GST_ROUND_UP_4 (info.height) / enc->cheight[i];
enc->v_max_samp = MAX (enc->v_max_samp, enc->v_samp[i]);
}
/* samp should only be 1, 2 or 4 */
g_assert (enc->h_max_samp <= 4);
g_assert (enc->v_max_samp <= 4);
/* now invert */
/* maximum is invariant, as one of the components should have samp 1 */
for (i = 0; i < enc->channels; ++i) {
enc->h_samp[i] = enc->h_max_samp / enc->h_samp[i];
enc->v_samp[i] = enc->v_max_samp / enc->v_samp[i];
}
enc->planar = (enc->inc[0] == 1 && enc->inc[1] == 1 && enc->inc[2] == 1);
othercaps = gst_caps_copy (gst_pad_get_pad_template_caps (enc->srcpad));
gst_caps_set_simple (othercaps,
"width", G_TYPE_INT, info.width, "height", G_TYPE_INT, info.height, NULL);
if (info.fps_d > 0)
gst_caps_set_simple (othercaps,
"framerate", GST_TYPE_FRACTION, info.fps_n, info.fps_d, NULL);
if (info.par_d > 0)
gst_caps_set_simple (othercaps,
"pixel-aspect-ratio", GST_TYPE_FRACTION, info.par_n, info.par_d, NULL);
ret = gst_pad_set_caps (enc->srcpad, othercaps);
gst_caps_unref (othercaps);
if (ret)
gst_jpegenc_resync (enc);
return ret;
/* ERRORS */
refuse_caps:
{
GST_WARNING_OBJECT (enc, "refused caps %" GST_PTR_FORMAT, caps);
return FALSE;
}
}
static gboolean
gst_jpegenc_sink_event (GstPad * pad, GstEvent * event)
{
gboolean res;
GstJpegEnc *enc = GST_JPEGENC (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
res = gst_jpegenc_setcaps (enc, caps);
break;
}
default:
res = gst_pad_event_default (pad, event);
break;
}
gst_object_unref (enc);
return res;
}
static void
gst_jpegenc_resync (GstJpegEnc * jpegenc)
{
gint width, height;
gint i, j;
const GstVideoFormatInfo *finfo;
GST_DEBUG_OBJECT (jpegenc, "resync");
finfo = jpegenc->info.finfo;
jpegenc->cinfo.image_width = width = GST_VIDEO_INFO_WIDTH (&jpegenc->info);
jpegenc->cinfo.image_height = height = GST_VIDEO_INFO_HEIGHT (&jpegenc->info);
jpegenc->cinfo.input_components = jpegenc->channels;
GST_DEBUG_OBJECT (jpegenc, "width %d, height %d", width, height);
GST_DEBUG_OBJECT (jpegenc, "format %d",
GST_VIDEO_INFO_FORMAT (&jpegenc->info));
if (GST_VIDEO_FORMAT_INFO_IS_RGB (finfo)) {
GST_DEBUG_OBJECT (jpegenc, "RGB");
jpegenc->cinfo.in_color_space = JCS_RGB;
} else if (GST_VIDEO_FORMAT_INFO_IS_GRAY (finfo)) {
GST_DEBUG_OBJECT (jpegenc, "gray");
jpegenc->cinfo.in_color_space = JCS_GRAYSCALE;
} else {
GST_DEBUG_OBJECT (jpegenc, "YUV");
jpegenc->cinfo.in_color_space = JCS_YCbCr;
}
/* input buffer size as max output */
jpegenc->bufsize = GST_VIDEO_INFO_SIZE (&jpegenc->info);
jpeg_set_defaults (&jpegenc->cinfo);
jpegenc->cinfo.raw_data_in = TRUE;
/* duh, libjpeg maps RGB to YUV ... and don't expect some conversion */
if (jpegenc->cinfo.in_color_space == JCS_RGB)
jpeg_set_colorspace (&jpegenc->cinfo, JCS_RGB);
GST_DEBUG_OBJECT (jpegenc, "h_max_samp=%d, v_max_samp=%d",
jpegenc->h_max_samp, jpegenc->v_max_samp);
/* image dimension info */
for (i = 0; i < jpegenc->channels; i++) {
GST_DEBUG_OBJECT (jpegenc, "comp %i: h_samp=%d, v_samp=%d", i,
jpegenc->h_samp[i], jpegenc->v_samp[i]);
jpegenc->cinfo.comp_info[i].h_samp_factor = jpegenc->h_samp[i];
jpegenc->cinfo.comp_info[i].v_samp_factor = jpegenc->v_samp[i];
g_free (jpegenc->line[i]);
jpegenc->line[i] = g_new (guchar *, jpegenc->v_max_samp * DCTSIZE);
if (!jpegenc->planar) {
for (j = 0; j < jpegenc->v_max_samp * DCTSIZE; j++) {
g_free (jpegenc->row[i][j]);
jpegenc->row[i][j] = g_malloc (width);
jpegenc->line[i][j] = jpegenc->row[i][j];
}
}
}
/* guard against a potential error in gst_jpegenc_term_destination
which occurs iff bufsize % 4 < free_space_remaining */
jpegenc->bufsize = GST_ROUND_UP_4 (jpegenc->bufsize);
jpeg_suppress_tables (&jpegenc->cinfo, TRUE);
GST_DEBUG_OBJECT (jpegenc, "resync done");
}
static GstFlowReturn
gst_jpegenc_chain (GstPad * pad, GstBuffer * buf)
{
GstFlowReturn ret;
GstJpegEnc *jpegenc;
guint height, width;
guchar *base[3], *end[3];
guint stride[3];
gint i, j, k;
GstBuffer *outbuf;
GstVideoFrame frame;
jpegenc = GST_JPEGENC (GST_OBJECT_PARENT (pad));
if (G_UNLIKELY (GST_VIDEO_INFO_FORMAT (&jpegenc->info) ==
GST_VIDEO_FORMAT_UNKNOWN))
goto not_negotiated;
if (!gst_video_frame_map (&frame, &jpegenc->info, buf, GST_MAP_READ))
goto invalid_frame;
height = GST_VIDEO_FRAME_HEIGHT (&frame);
width = GST_VIDEO_FRAME_WIDTH (&frame);
GST_LOG_OBJECT (jpegenc, "got buffer of %lu bytes",
gst_buffer_get_size (buf));
for (i = 0; i < jpegenc->channels; i++) {
base[i] = GST_VIDEO_FRAME_COMP_DATA (&frame, i);
stride[i] = GST_VIDEO_FRAME_COMP_STRIDE (&frame, i);
end[i] = base[i] + GST_VIDEO_FRAME_COMP_HEIGHT (&frame, i) * stride[i];
}
jpegenc->output_mem = gst_allocator_alloc (NULL, jpegenc->bufsize, 3);
jpegenc->output_data =
gst_memory_map (jpegenc->output_mem, &jpegenc->output_size, NULL,
GST_MAP_READWRITE);
jpegenc->jdest.next_output_byte = jpegenc->output_data;
jpegenc->jdest.free_in_buffer = jpegenc->output_size;
/* prepare for raw input */
#if JPEG_LIB_VERSION >= 70
jpegenc->cinfo.do_fancy_downsampling = FALSE;
#endif
jpegenc->cinfo.smoothing_factor = jpegenc->smoothing;
jpegenc->cinfo.dct_method = jpegenc->idct_method;
jpeg_set_quality (&jpegenc->cinfo, jpegenc->quality, TRUE);
jpeg_start_compress (&jpegenc->cinfo, TRUE);
GST_LOG_OBJECT (jpegenc, "compressing");
if (jpegenc->planar) {
for (i = 0; i < height; i += jpegenc->v_max_samp * DCTSIZE) {
for (k = 0; k < jpegenc->channels; k++) {
for (j = 0; j < jpegenc->v_samp[k] * DCTSIZE; j++) {
jpegenc->line[k][j] = base[k];
if (base[k] + stride[k] < end[k])
base[k] += stride[k];
}
}
jpeg_write_raw_data (&jpegenc->cinfo, jpegenc->line,
jpegenc->v_max_samp * DCTSIZE);
}
} else {
for (i = 0; i < height; i += jpegenc->v_max_samp * DCTSIZE) {
for (k = 0; k < jpegenc->channels; k++) {
for (j = 0; j < jpegenc->v_samp[k] * DCTSIZE; j++) {
guchar *src, *dst;
gint l;
/* ouch, copy line */
src = base[k];
dst = jpegenc->line[k][j];
for (l = jpegenc->cwidth[k]; l > 0; l--) {
*dst = *src;
src += jpegenc->inc[k];
dst++;
}
if (base[k] + stride[k] < end[k])
base[k] += stride[k];
}
}
jpeg_write_raw_data (&jpegenc->cinfo, jpegenc->line,
jpegenc->v_max_samp * DCTSIZE);
}
}
/* This will ensure that gst_jpegenc_term_destination is called */
jpeg_finish_compress (&jpegenc->cinfo);
GST_LOG_OBJECT (jpegenc, "compressing done");
outbuf = gst_buffer_new ();
gst_buffer_copy_into (outbuf, buf, GST_BUFFER_COPY_METADATA, 0, -1);
gst_buffer_take_memory (outbuf, -1, jpegenc->output_mem);
jpegenc->output_mem = NULL;
ret = gst_pad_push (jpegenc->srcpad, outbuf);
gst_video_frame_unmap (&frame);
gst_buffer_unref (buf);
return ret;
/* ERRORS */
not_negotiated:
{
GST_WARNING_OBJECT (jpegenc, "no input format set (no caps on buffer)");
gst_buffer_unref (buf);
return GST_FLOW_NOT_NEGOTIATED;
}
invalid_frame:
{
GST_WARNING_OBJECT (jpegenc, "invalid frame received");
gst_buffer_unref (buf);
return GST_FLOW_OK;
}
}
static void
gst_jpegenc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstJpegEnc *jpegenc = GST_JPEGENC (object);
GST_OBJECT_LOCK (jpegenc);
switch (prop_id) {
case PROP_QUALITY:
jpegenc->quality = g_value_get_int (value);
break;
#ifdef ENABLE_SMOOTHING
case PROP_SMOOTHING:
jpegenc->smoothing = g_value_get_int (value);
break;
#endif
case PROP_IDCT_METHOD:
jpegenc->idct_method = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (jpegenc);
}
static void
gst_jpegenc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstJpegEnc *jpegenc = GST_JPEGENC (object);
GST_OBJECT_LOCK (jpegenc);
switch (prop_id) {
case PROP_QUALITY:
g_value_set_int (value, jpegenc->quality);
break;
#ifdef ENABLE_SMOOTHING
case PROP_SMOOTHING:
g_value_set_int (value, jpegenc->smoothing);
break;
#endif
case PROP_IDCT_METHOD:
g_value_set_enum (value, jpegenc->idct_method);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (jpegenc);
}
static GstStateChangeReturn
gst_jpegenc_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstJpegEnc *filter = GST_JPEGENC (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
GST_DEBUG_OBJECT (element, "setting line buffers");
filter->line[0] = NULL;
filter->line[1] = NULL;
filter->line[2] = NULL;
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:
gst_jpegenc_reset (filter);
break;
default:
break;
}
return ret;
}