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gstreamer/gst/pnm/gstpnmenc.c
Nicolas Dufresne 951157c2a5 doc: Automatic update 
This is an automatic update with manual merges of running
"make update" in the doc/plugins directory. This should help
later maintenance of the plugins doc. A lot of plugin are
not referenced yet in the doc. Will come later.
2016-06-21 13:46:00 -04:00

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/* GStreamer PNM encoder
* Copyright (C) 2009 Lutz Mueller <lutz@users.sourceforge.net>
*
* 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-pnmenc
*
* Encodes pnm images. This plugin supports both raw and ASCII encoding.
* To enable ASCII encoding, set the parameter ascii to TRUE. If you omit
* the parameter or set it to FALSE, the output will be raw encoded.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 videotestsrc num_buffers=1 ! videoconvert ! "video/x-raw,format=GRAY8" ! pnmenc ascii=true ! filesink location=test.pnm
* ]| The above pipeline writes a test pnm file (ASCII encoding).
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstpnmenc.h"
#include "gstpnmutils.h"
#include <gst/gstutils.h>
#include <gst/video/video.h>
#include <gst/video/gstvideometa.h>
#include <stdio.h>
#include <string.h>
enum
{
GST_PNMENC_PROP_0,
GST_PNMENC_PROP_ASCII
/* Add here. */
};
static GstStaticPadTemplate sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE
("{ RGB, GRAY8, GRAY16_BE, GRAY16_LE }")));
static GstStaticPadTemplate src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS (MIME_ALL));
G_DEFINE_TYPE (GstPnmenc, gst_pnmenc, GST_TYPE_VIDEO_ENCODER);
#define parent_class gst_pnmenc_parent_class
static GstFlowReturn
gst_pnmenc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame);
static void gst_pnmenc_finalize (GObject * object);
static void
gst_pnmenc_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstPnmenc *s = GST_PNMENC (object);
switch (prop_id) {
case GST_PNMENC_PROP_ASCII:
if (g_value_get_boolean (value)) {
s->info.encoding = GST_PNM_ENCODING_ASCII;
} else {
s->info.encoding = GST_PNM_ENCODING_RAW;
}
s->info.fields |= GST_PNM_INFO_FIELDS_ENCODING;
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_pnmenc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstPnmenc *s = GST_PNMENC (object);
switch (prop_id) {
case GST_PNMENC_PROP_ASCII:
g_value_set_boolean (value, s->info.encoding == GST_PNM_ENCODING_ASCII);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_pnmenc_init (GstPnmenc * s)
{
GST_PAD_SET_ACCEPT_TEMPLATE (GST_VIDEO_ENCODER_SINK_PAD (s));
/* Set default encoding as RAW as ASCII takes up 4 time more bytes */
s->info.encoding = GST_PNM_ENCODING_RAW;
}
static void
gst_pnmenc_finalize (GObject * object)
{
GstPnmenc *pnmenc = GST_PNMENC (object);
if (pnmenc->input_state)
gst_video_codec_state_unref (pnmenc->input_state);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_pnmenc_set_format (GstVideoEncoder * encoder, GstVideoCodecState * state)
{
GstPnmenc *pnmenc;
gboolean ret = TRUE;
GstVideoInfo *info;
GstVideoCodecState *output_state;
const gchar *mime_type = NULL;
pnmenc = GST_PNMENC (encoder);
info = &state->info;
switch (GST_VIDEO_INFO_FORMAT (info)) {
case GST_VIDEO_FORMAT_RGB:
pnmenc->info.max = 255;
pnmenc->info.type = GST_PNM_TYPE_PIXMAP;
mime_type = MIME_PM;
break;
case GST_VIDEO_FORMAT_GRAY8:
pnmenc->info.max = 255;
pnmenc->info.type = GST_PNM_TYPE_GRAYMAP;
mime_type = MIME_GM;
break;
case GST_VIDEO_FORMAT_GRAY16_BE:
case GST_VIDEO_FORMAT_GRAY16_LE:
pnmenc->info.max = 65535;
pnmenc->info.type = GST_PNM_TYPE_GRAYMAP;
mime_type = MIME_GM;
break;
default:
ret = FALSE;
goto done;
}
pnmenc->info.width = GST_VIDEO_INFO_WIDTH (info);
pnmenc->info.height = GST_VIDEO_INFO_HEIGHT (info);
if (pnmenc->input_state)
gst_video_codec_state_unref (pnmenc->input_state);
pnmenc->input_state = gst_video_codec_state_ref (state);
output_state =
gst_video_encoder_set_output_state (encoder,
gst_caps_new_empty_simple (mime_type), state);
gst_video_codec_state_unref (output_state);
done:
return ret;
}
static GstFlowReturn
gst_pnmenc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame)
{
GstPnmenc *pnmenc;
guint size, pixels, bytesize;
GstMapInfo omap, imap;
gchar *header = NULL;
GstVideoInfo *info;
GstFlowReturn ret = GST_FLOW_OK;
guint i_rowstride, o_rowstride;
guint bytes = 0, index, head_size;
guint i, j;
guint maxbytes_per_pixel, str_len;
gchar format_str[4];
pnmenc = GST_PNMENC (encoder);
info = &pnmenc->input_state->info;
switch (GST_VIDEO_INFO_FORMAT (info)) {
case GST_VIDEO_FORMAT_RGB:
pixels = size = pnmenc->info.width * pnmenc->info.height * 3;
bytesize = 1;
maxbytes_per_pixel = 4;
str_len = 3;
g_strlcpy (format_str, "%3i", 4);
break;
case GST_VIDEO_FORMAT_GRAY8:
pixels = size = pnmenc->info.width * pnmenc->info.height * 1;
bytesize = 1;
maxbytes_per_pixel = 4;
str_len = 3;
g_strlcpy (format_str, "%3i", 4);
break;
case GST_VIDEO_FORMAT_GRAY16_LE:
case GST_VIDEO_FORMAT_GRAY16_BE:
pixels = pnmenc->info.width * pnmenc->info.height * 1;
bytesize = 2;
size = pixels * bytesize;
maxbytes_per_pixel = 6;
str_len = 5;
g_strlcpy (format_str, "%5i", 4);
break;
default:
ret = FALSE;
goto done;
}
header = g_strdup_printf ("P%i\n%i %i\n%i\n",
pnmenc->info.type + 3 * (1 - pnmenc->info.encoding), pnmenc->info.width,
pnmenc->info.height, pnmenc->info.max);
if (pnmenc->info.encoding == GST_PNM_ENCODING_ASCII) {
/* Per component 4 bytes are used in case of ASCII encoding */
size = size * 4 + size / 20;
size += strlen (header);
frame->output_buffer =
gst_video_encoder_allocate_output_buffer (encoder, (size));
} else {
size += strlen (header);
frame->output_buffer =
gst_video_encoder_allocate_output_buffer (encoder, size);
}
if (gst_buffer_map (frame->output_buffer, &omap, GST_MAP_WRITE) == FALSE) {
ret = GST_FLOW_ERROR;
goto done;
}
if (gst_buffer_map (frame->input_buffer, &imap, GST_MAP_READ) == FALSE) {
/* Unmap already mapped buffer */
gst_buffer_unmap (frame->output_buffer, &omap);
ret = GST_FLOW_ERROR;
goto done;
}
/* Copy out the header first */
head_size = strlen (header);
memcpy (omap.data, header, head_size);
if (pnmenc->info.encoding == GST_PNM_ENCODING_ASCII) {
/* We need to convert to ASCII */
/* Convert from gstreamer rowstride to PNM rowstride as we go */
if (pnmenc->info.type == GST_PNM_TYPE_PIXMAP) {
o_rowstride = 3 * pnmenc->info.width;
} else {
o_rowstride = pnmenc->info.width;
}
i_rowstride = GST_VIDEO_FRAME_COMP_STRIDE (pnmenc->input_state, 0);
switch (GST_VIDEO_INFO_FORMAT (info)) {
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_GRAY8:
for (i = 0; i < pnmenc->info.height; i++) {
index = i * i_rowstride;
for (j = 0; j < o_rowstride; j++, bytes++, index++) {
g_snprintf ((char *) omap.data + head_size, maxbytes_per_pixel,
format_str, imap.data[index]);
head_size += str_len;
omap.data[head_size++] = ' ';
/* Add new line so that file will not end up with single big line */
if (!((bytes + 1) % 20))
omap.data[head_size++] = '\n';
}
}
break;
case GST_VIDEO_FORMAT_GRAY16_BE:
for (i = 0; i < pnmenc->info.height; i++) {
index = i * i_rowstride;
for (j = 0; j < o_rowstride; j++, bytes++, index += 2) {
g_snprintf ((char *) omap.data + head_size, maxbytes_per_pixel,
format_str, GST_READ_UINT16_BE (imap.data + index));
head_size += str_len;
omap.data[head_size++] = ' ';
/* Add new line so that file will not end up with single big line */
if (!((bytes + 1) % 20))
omap.data[head_size++] = '\n';
}
}
break;
case GST_VIDEO_FORMAT_GRAY16_LE:
for (i = 0; i < pnmenc->info.height; i++) {
index = i * i_rowstride;
for (j = 0; j < o_rowstride; j++, bytes++, index += 2) {
g_snprintf ((char *) omap.data + head_size, maxbytes_per_pixel,
format_str, GST_READ_UINT16_LE (imap.data + index));
head_size += str_len;
omap.data[head_size++] = ' ';
/* Add new line so that file will not end up with single big line */
if (!((bytes + 1) % 20))
omap.data[head_size++] = '\n';
}
}
break;
default:
GST_ERROR_OBJECT (encoder, "Unhandled format %s",
gst_video_format_to_string (GST_VIDEO_INFO_FORMAT (info)));
gst_buffer_unmap (frame->output_buffer, &omap);
gst_buffer_unmap (frame->input_buffer, &imap);
g_free (header);
return GST_FLOW_ERROR;
}
gst_buffer_set_size (frame->output_buffer, head_size);
} else {
guint out_index = head_size;
/* Binary output. 8-bit, or 16-bit BE */
if (pnmenc->info.type == GST_PNM_TYPE_PIXMAP) {
o_rowstride = 3 * pnmenc->info.width * bytesize;
} else {
o_rowstride = pnmenc->info.width * bytesize;
}
i_rowstride = GST_VIDEO_FRAME_COMP_STRIDE (pnmenc->input_state, 0);
switch (GST_VIDEO_INFO_FORMAT (info)) {
case GST_VIDEO_FORMAT_GRAY16_BE:
for (i = 0; i < pnmenc->info.height; i++) {
index = i * i_rowstride;
for (j = 0; j < o_rowstride; j += 2, index += 2) {
guint16 val = GST_READ_UINT16_LE (imap.data + index);
GST_WRITE_UINT16_BE (omap.data + out_index, val);
out_index += 2;
}
}
break;
case GST_VIDEO_FORMAT_GRAY16_LE:
for (i = 0; i < pnmenc->info.height; i++) {
index = i * i_rowstride;
for (j = 0; j < o_rowstride; j += 2, index += 2) {
guint16 val = GST_READ_UINT16_LE (imap.data + index);
GST_WRITE_UINT16_BE (omap.data + out_index, val);
out_index += 2;
}
}
break;
default:
for (i = 0; i < pnmenc->info.height; i++) {
memcpy (omap.data + head_size + o_rowstride * i,
imap.data + i_rowstride * i, o_rowstride);
}
}
}
gst_buffer_unmap (frame->output_buffer, &omap);
gst_buffer_unmap (frame->input_buffer, &imap);
if ((ret = gst_video_encoder_finish_frame (encoder, frame)) != GST_FLOW_OK)
goto done;
done:
g_free (header);
return ret;
}
static void
gst_pnmenc_class_init (GstPnmencClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstVideoEncoderClass *venc_class = (GstVideoEncoderClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = gst_pnmenc_set_property;
gobject_class->get_property = gst_pnmenc_get_property;
g_object_class_install_property (gobject_class, GST_PNMENC_PROP_ASCII,
g_param_spec_boolean ("ascii", "ASCII Encoding", "The output will be "
"ASCII encoded", FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (element_class, &sink_pad_template);
gst_element_class_add_static_pad_template (element_class, &src_pad_template);
gst_element_class_set_static_metadata (element_class, "PNM image encoder",
"Codec/Encoder/Image",
"Encodes images into portable pixmap or graymap (PNM) format",
"Lutz Mueller <lutz@users.sourceforge.net>");
venc_class->set_format = gst_pnmenc_set_format;
venc_class->handle_frame = gst_pnmenc_handle_frame;
gobject_class->finalize = gst_pnmenc_finalize;
}
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