/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2012 Collabora Ltd.
* Author : Edward Hervey <edward@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-jpegenc
*
* Encodes jpeg images.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 videotestsrc num-buffers=50 ! video/x-raw, 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>
#include <gst/video/gstvideometa.h>
#include <gst/base/base.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
#define JPEG_DEFAULT_SNAPSHOT FALSE
/* JpegEnc signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_QUALITY,
PROP_SMOOTHING,
PROP_IDCT_METHOD,
PROP_SNAPSHOT
};
static void gst_jpegenc_finalize (GObject * object);
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 gboolean gst_jpegenc_start (GstVideoEncoder * benc);
static gboolean gst_jpegenc_stop (GstVideoEncoder * benc);
static gboolean gst_jpegenc_set_format (GstVideoEncoder * encoder,
GstVideoCodecState * state);
static GstFlowReturn gst_jpegenc_handle_frame (GstVideoEncoder * encoder,
GstVideoCodecFrame * frame);
static gboolean gst_jpegenc_propose_allocation (GstVideoEncoder * encoder,
GstQuery * query);
/* static guint gst_jpegenc_signals[LAST_SIGNAL] = { 0 }; */
#define gst_jpegenc_parent_class parent_class
G_DEFINE_TYPE (GstJpegEnc, gst_jpegenc, GST_TYPE_VIDEO_ENCODER);
/* *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, NV21, "
"NV12, 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 ], "
"sof-marker = (int) { 0, 1, 2, 4, 9 }")
);
static void
gst_jpegenc_class_init (GstJpegEncClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstVideoEncoderClass *venc_class;
gobject_class = (GObjectClass *) klass;
element_class = (GstElementClass *) klass;
venc_class = (GstVideoEncoderClass *) klass;
parent_class = g_type_class_peek_parent (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 |
GST_PARAM_MUTABLE_PLAYING));
#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));
/**
* GstJpegEnc:snapshot:
*
* Send EOS after encoding a frame, useful for snapshots.
*
* Since: 1.14
*/
g_object_class_install_property (gobject_class, PROP_SNAPSHOT,
g_param_spec_boolean ("snapshot", "Snapshot",
"Send EOS after encoding a frame, useful for snapshots",
JPEG_DEFAULT_SNAPSHOT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (element_class,
&gst_jpegenc_sink_pad_template);
gst_element_class_add_static_pad_template (element_class,
&gst_jpegenc_src_pad_template);
gst_element_class_set_static_metadata (element_class, "JPEG image encoder",
"Codec/Encoder/Image", "Encode images in JPEG format",
"Wim Taymans <wim.taymans@tvd.be>");
venc_class->start = gst_jpegenc_start;
venc_class->stop = gst_jpegenc_stop;
venc_class->set_format = gst_jpegenc_set_format;
venc_class->handle_frame = gst_jpegenc_handle_frame;
venc_class->propose_allocation = gst_jpegenc_propose_allocation;
GST_DEBUG_CATEGORY_INIT (jpegenc_debug, "jpegenc", 0,
"JPEG encoding element");
}
static void
gst_jpegenc_init_destination (j_compress_ptr cinfo)
{
GST_DEBUG ("gst_jpegenc_chain: init_destination");
}
static void
ensure_memory (GstJpegEnc * jpegenc)
{
GstMemory *new_memory;
GstMapInfo map;
gsize old_size, desired_size, new_size;
guint8 *new_data;
static GstAllocationParams params = { 0, 3, 0, 0, };
old_size = jpegenc->output_map.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, ¶ms);
gst_memory_map (new_memory, &map, GST_MAP_READWRITE);
new_data = map.data;
new_size = map.size;
/* copy previous data if any */
if (jpegenc->output_mem) {
memcpy (new_data, jpegenc->output_map.data, old_size);
gst_memory_unmap (jpegenc->output_mem, &jpegenc->output_map);
gst_memory_unref (jpegenc->output_mem);
}
/* drop it into place, */
jpegenc->output_mem = new_memory;
jpegenc->output_map = map;
/* 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 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)
{
GstBuffer *outbuf;
GstJpegEnc *jpegenc = (GstJpegEnc *) (cinfo->client_data);
gsize memory_size = jpegenc->output_map.size - jpegenc->jdest.free_in_buffer;
GstByteReader reader =
GST_BYTE_READER_INIT (jpegenc->output_map.data, memory_size);
guint16 marker;
gint sof_marker = -1;
GST_DEBUG_OBJECT (jpegenc, "gst_jpegenc_chain: term_source");
/* Find the SOF marker */
while (gst_byte_reader_get_uint16_be (&reader, &marker)) {
/* SOF marker */
if (marker >> 4 == 0x0ffc) {
sof_marker = marker & 0x4;
break;
}
}
gst_memory_unmap (jpegenc->output_mem, &jpegenc->output_map);
/* Trim the buffer size. we will push it in the chain function */
gst_memory_resize (jpegenc->output_mem, 0, memory_size);
jpegenc->output_map.data = NULL;
jpegenc->output_map.size = 0;
if (jpegenc->sof_marker != sof_marker || jpegenc->input_caps_changed) {
GstVideoCodecState *output;
output =
gst_video_encoder_set_output_state (GST_VIDEO_ENCODER (jpegenc),
gst_caps_new_simple ("image/jpeg", "sof-marker", G_TYPE_INT, sof_marker,
NULL), jpegenc->input_state);
gst_video_codec_state_unref (output);
jpegenc->sof_marker = sof_marker;
jpegenc->input_caps_changed = FALSE;
}
outbuf = gst_buffer_new ();
gst_buffer_copy_into (outbuf, jpegenc->current_frame->input_buffer,
GST_BUFFER_COPY_METADATA, 0, -1);
gst_buffer_append_memory (outbuf, jpegenc->output_mem);
jpegenc->output_mem = NULL;
jpegenc->current_frame->output_buffer = outbuf;
gst_video_frame_unmap (&jpegenc->current_vframe);
GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT (jpegenc->current_frame);
jpegenc->res = gst_video_encoder_finish_frame (GST_VIDEO_ENCODER (jpegenc),
jpegenc->current_frame);
jpegenc->current_frame = NULL;
}
static void
gst_jpegenc_init (GstJpegEnc * jpegenc)
{
GST_PAD_SET_ACCEPT_TEMPLATE (GST_VIDEO_ENCODER_SINK_PAD (jpegenc));
/* 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;
jpegenc->snapshot = JPEG_DEFAULT_SNAPSHOT;
}
static void
gst_jpegenc_finalize (GObject * object)
{
GstJpegEnc *filter = GST_JPEGENC (object);
jpeg_destroy_compress (&filter->cinfo);
if (filter->input_state)
gst_video_codec_state_unref (filter->input_state);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_jpegenc_set_format (GstVideoEncoder * encoder, GstVideoCodecState * state)
{
GstJpegEnc *enc = GST_JPEGENC (encoder);
gint i;
GstVideoInfo *info = &state->info;
if (enc->input_state)
gst_video_codec_state_unref (enc->input_state);
enc->input_state = gst_video_codec_state_ref (state);
/* prepare a cached image description */
enc->channels = GST_VIDEO_INFO_N_COMPONENTS (info);
/* ... but any alpha is disregarded in encoding */
if (GST_VIDEO_INFO_IS_GRAY (info))
enc->channels = 1;
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 (GST_VIDEO_INFO_WIDTH (info)) / enc->cwidth[i];
enc->h_max_samp = MAX (enc->h_max_samp, enc->h_samp[i]);
enc->v_samp[i] =
GST_ROUND_UP_4 (GST_VIDEO_INFO_HEIGHT (info)) / 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) {
GST_DEBUG ("%d %d", enc->h_samp[i], enc->h_max_samp);
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);
enc->input_caps_changed = TRUE;
gst_jpegenc_resync (enc);
return TRUE;
}
static void
gst_jpegenc_resync (GstJpegEnc * jpegenc)
{
GstVideoInfo *info;
gint width, height;
gint i, j;
GST_DEBUG_OBJECT (jpegenc, "resync");
if (!jpegenc->input_state)
return;
info = &jpegenc->input_state->info;
jpegenc->cinfo.image_width = width = GST_VIDEO_INFO_WIDTH (info);
jpegenc->cinfo.image_height = height = GST_VIDEO_INFO_HEIGHT (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 (info));
if (GST_VIDEO_INFO_IS_RGB (info)) {
GST_DEBUG_OBJECT (jpegenc, "RGB");
jpegenc->cinfo.in_color_space = JCS_RGB;
} else if (GST_VIDEO_INFO_IS_GRAY (info)) {
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 (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_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame)
{
GstJpegEnc *jpegenc;
guint height;
guchar *base[3], *end[3];
guint stride[3];
gint i, j, k;
static GstAllocationParams params = { 0, 0, 0, 3, };
jpegenc = GST_JPEGENC (encoder);
GST_LOG_OBJECT (jpegenc, "got new frame");
if (!gst_video_frame_map (&jpegenc->current_vframe,
&jpegenc->input_state->info, frame->input_buffer, GST_MAP_READ))
goto invalid_frame;
jpegenc->current_frame = frame;
height = GST_VIDEO_INFO_HEIGHT (&jpegenc->input_state->info);
for (i = 0; i < jpegenc->channels; i++) {
base[i] = GST_VIDEO_FRAME_COMP_DATA (&jpegenc->current_vframe, i);
stride[i] = GST_VIDEO_FRAME_COMP_STRIDE (&jpegenc->current_vframe, i);
end[i] =
base[i] + GST_VIDEO_FRAME_COMP_HEIGHT (&jpegenc->current_vframe,
i) * stride[i];
}
jpegenc->res = GST_FLOW_OK;
jpegenc->output_mem = gst_allocator_alloc (NULL, jpegenc->bufsize, ¶ms);
gst_memory_map (jpegenc->output_mem, &jpegenc->output_map, GST_MAP_READWRITE);
jpegenc->jdest.next_output_byte = jpegenc->output_map.data;
jpegenc->jdest.free_in_buffer = jpegenc->output_map.size;
/* prepare for raw input */
#if JPEG_LIB_VERSION >= 70
jpegenc->cinfo.do_fancy_downsampling = FALSE;
#endif
GST_OBJECT_LOCK (jpegenc);
jpegenc->cinfo.smoothing_factor = jpegenc->smoothing;
jpegenc->cinfo.dct_method = jpegenc->idct_method;
jpeg_set_quality (&jpegenc->cinfo, jpegenc->quality, TRUE);
GST_OBJECT_UNLOCK (jpegenc);
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");
return (jpegenc->snapshot) ? GST_FLOW_EOS : jpegenc->res;
invalid_frame:
{
GST_WARNING_OBJECT (jpegenc, "invalid frame received");
return gst_video_encoder_finish_frame (encoder, frame);
}
}
static gboolean
gst_jpegenc_propose_allocation (GstVideoEncoder * encoder, GstQuery * query)
{
gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
return GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder,
query);
}
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;
case PROP_SNAPSHOT:
jpegenc->snapshot = g_value_get_boolean (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;
case PROP_SNAPSHOT:
g_value_set_boolean (value, jpegenc->snapshot);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (jpegenc);
}
static gboolean
gst_jpegenc_start (GstVideoEncoder * benc)
{
GstJpegEnc *enc = (GstJpegEnc *) benc;
enc->line[0] = NULL;
enc->line[1] = NULL;
enc->line[2] = NULL;
enc->sof_marker = -1;
return TRUE;
}
static gboolean
gst_jpegenc_stop (GstVideoEncoder * benc)
{
GstJpegEnc *enc = (GstJpegEnc *) benc;
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;
}
}
return TRUE;
}