gstreamer/subprojects/gst-plugins-bad/ext/mpeg2enc/gstmpeg2encpicturereader.cc

181 lines
5.2 KiB
C++

/* GStreamer mpeg2enc (mjpegtools) wrapper
* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* gstmpeg2encpicturereader.cc: GStreamer/mpeg2enc input wrapper
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <encoderparams.hh>
#include <string.h>
#include "gstmpeg2enc.hh"
#include "gstmpeg2encpicturereader.hh"
/*
* Class init stuff.
*/
GstMpeg2EncPictureReader::GstMpeg2EncPictureReader (GstElement * in_element, GstCaps * in_caps, EncoderParams * params):
PictureReader (*params)
{
element = in_element;
gst_object_ref (element);
caps = in_caps;
gst_caps_ref (caps);
}
GstMpeg2EncPictureReader::~GstMpeg2EncPictureReader ()
{
gst_caps_unref (caps);
gst_object_unref (element);
}
/*
* Get input picture parameters (width/height etc.).
*/
void
GstMpeg2EncPictureReader::StreamPictureParams (MPEG2EncInVidParams & strm)
{
GstStructure *structure = gst_caps_get_structure (caps, 0);
gint width, height;
const GValue *fps_val;
const GValue *par_val;
y4m_ratio_t fps;
y4m_ratio_t par;
const gchar *interlace_mode;
if (!gst_structure_get_int (structure, "width", &width))
width = -1;
if (!gst_structure_get_int (structure, "height", &height))
height = -1;
fps_val = gst_structure_get_value (structure, "framerate");
if (fps_val != NULL) {
fps.n = gst_value_get_fraction_numerator (fps_val);
fps.d = gst_value_get_fraction_denominator (fps_val);
strm.frame_rate_code = mpeg_framerate_code (fps);
} else
strm.frame_rate_code = 0;
par_val = gst_structure_get_value (structure, "pixel-aspect-ratio");
if (par_val != NULL) {
par.n = gst_value_get_fraction_numerator (par_val);
par.d = gst_value_get_fraction_denominator (par_val);
} else {
/* By default, assume square pixels */
par.n = 1;
par.d = 1;
}
strm.horizontal_size = width;
strm.vertical_size = height;
interlace_mode = gst_structure_get_string (structure, "interlace-mode");
if (!g_strcmp0(interlace_mode, "interleaved")) {
const gchar *field_order = gst_structure_get_string(structure, "field-order");
if (!g_strcmp0(field_order, "bottom-field-first")) {
strm.interlacing_code = Y4M_ILACE_BOTTOM_FIRST;
} else if (!g_strcmp0(field_order, "top-field-first")) {
strm.interlacing_code = Y4M_ILACE_TOP_FIRST;
} else {
GST_WARNING ("No field-order in caps, assuming top field first");
strm.interlacing_code = Y4M_ILACE_TOP_FIRST;
}
} else if (!g_strcmp0(interlace_mode, "mixed")) {
strm.interlacing_code = Y4M_ILACE_MIXED;
} else {
strm.interlacing_code = Y4M_ILACE_NONE;
}
strm.aspect_ratio_code = mpeg_guess_mpeg_aspect_code (2, par,
strm.horizontal_size, strm.vertical_size);
GST_DEBUG_OBJECT (element, "Guessing aspect ratio code for PAR %d/%d "
"yielded: %d", par.n, par.d, strm.aspect_ratio_code);
}
/*
* Read a frame. Return true means EOS or error.
*/
bool
GstMpeg2EncPictureReader::LoadFrame (ImagePlanes & image)
{
gint i, x, y, s;
guint8 *frame;
GstMpeg2enc *enc;
GstVideoFrame vframe;
GstVideoCodecFrame *inframe = NULL;
enc = GST_MPEG2ENC (element);
GST_MPEG2ENC_MUTEX_LOCK (enc);
/* hang around until the element provides us with a buffer */
while (enc->pending_frame == NULL) {
if (enc->eos) {
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
/* inform the mpeg encoding loop that it can give up */
return TRUE;
}
GST_MPEG2ENC_WAIT (enc);
}
inframe = enc->pending_frame;
gst_video_frame_map (&vframe, &enc->input_state->info, inframe->input_buffer, GST_MAP_READ);
enc->pending_frame = NULL;
frame = GST_VIDEO_FRAME_COMP_DATA (&vframe, 0);
s = GST_VIDEO_FRAME_COMP_STRIDE (&vframe, 0);
x = encparams.horizontal_size;
y = encparams.vertical_size;
for (i = 0; i < y; i++) {
memcpy (image.Plane (0) + i * encparams.phy_width, frame, x);
frame += s;
}
frame = GST_VIDEO_FRAME_COMP_DATA (&vframe, 1);
s = GST_VIDEO_FRAME_COMP_STRIDE (&vframe, 1);
x >>= 1;
y >>= 1;
for (i = 0; i < y; i++) {
memcpy (image.Plane (1) + i * encparams.phy_chrom_width, frame, x);
frame += s;
}
frame = GST_VIDEO_FRAME_COMP_DATA (&vframe, 2);
s = GST_VIDEO_FRAME_COMP_STRIDE (&vframe, 2);
for (i = 0; i < y; i++) {
memcpy (image.Plane (2) + i * encparams.phy_chrom_width, frame, x);
frame += s;
}
gst_video_frame_unmap (&vframe);
/* inform the element the buffer has been processed */
GST_MPEG2ENC_SIGNAL (enc);
GST_MPEG2ENC_MUTEX_UNLOCK (enc);
return FALSE;
}