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theora: Refactor the buffer copy code

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This commit is contained in:
Benjamin Otte 2009-09-04 20:23:52 +02:00 committed by Sebastian Dröge
parent bac05fbf6f
commit 96388221cf
1 changed files with 51 additions and 109 deletions
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160
ext/theora/theoraenc.c
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@ -769,20 +769,46 @@ theora_enc_init_yuv_buffer (yuv_buffer * yuv,
yuv->v = yuv->u + GST_ROUND_UP_2 (height) / 2 * yuv->uv_stride;
}
/* NB: This function does no input checking */
static void
copy_plane (guint8 * dest, int dest_width, int dest_height, int dest_stride,
const guint8 * src, int src_width, int src_height, int src_stride,
int offset_x, int offset_y, GstTheoraEncBorderMode border, int black)
{
int right_x, right_border, i;
/* fill top border */
if (border != BORDER_NONE) {
memset (dest, black, dest_stride * offset_y);
}
dest += dest_stride * offset_y;
right_x = src_width + offset_x;
right_border = dest_width - right_x;
/* copy source */
for (i = 0; i < src_height; i++) {
memcpy (dest + offset_x, src, src_width);
if (border != BORDER_NONE) {
memset (dest, black, offset_x);
memset (dest + right_x, black, right_border);
}
dest += dest_stride;
src += src_stride;
}
/* fill bottom border */
if (border != BORDER_NONE) {
memset (dest, black, dest_stride * (dest_height - src_height - offset_y));
}
}
static GstBuffer *
theora_enc_resize_buffer (GstTheoraEnc * enc, GstBuffer * buffer)
{
yuv_buffer dest, src;
GstBuffer *newbuf;
gint i;
guchar *dest_y, *src_y;
guchar *dest_u, *src_u;
guchar *dest_v, *src_v;
gint src_y_stride, src_uv_stride;
gint dst_y_stride, dst_uv_stride;
gint width, height;
gint cwidth, cheight;
gint offset_x, right_x, right_border;
gint y_size;
if (enc->width == enc->info_width && enc->height == enc->info_height) {
GST_LOG_OBJECT (enc, "no cropping/conversion needed");
@ -790,24 +816,9 @@ theora_enc_resize_buffer (GstTheoraEnc * enc, GstBuffer * buffer)
}
GST_LOG_OBJECT (enc, "cropping/conversion needed for strides");
/* source width/height */
width = enc->width;
height = enc->height;
/* soucre chroma width/height */
cwidth = width / 2;
cheight = height / 2;
/* source strides as defined in videotestsrc */
src_y_stride = GST_ROUND_UP_4 (width);
src_uv_stride = GST_ROUND_UP_8 (width) / 2;
/* destination strides from the real picture width */
dst_y_stride = enc->info_width;
dst_uv_stride = enc->info_width / 2;
y_size = enc->info_width * enc->info_height;
newbuf = gst_buffer_new_and_alloc (y_size * 3 / 2);
newbuf =
gst_buffer_new_and_alloc (enc->info_width * enc->info_height * 3 / 2);
if (!newbuf) {
gst_buffer_unref (buffer);
return NULL;
@ -815,90 +826,21 @@ theora_enc_resize_buffer (GstTheoraEnc * enc, GstBuffer * buffer)
GST_BUFFER_OFFSET (newbuf) = GST_BUFFER_OFFSET_NONE;
gst_buffer_set_caps (newbuf, GST_PAD_CAPS (enc->srcpad));
dest_y = GST_BUFFER_DATA (newbuf);
dest_u = dest_y + y_size;
dest_v = dest_u + y_size / 4;
theora_enc_init_yuv_buffer (&src, GST_BUFFER_DATA (buffer),
enc->width, enc->height);
theora_enc_init_yuv_buffer (&dest, GST_BUFFER_DATA (newbuf),
enc->info_width, enc->info_height);
src_y = GST_BUFFER_DATA (buffer);
src_u = src_y + src_y_stride * GST_ROUND_UP_2 (height);
src_v = src_u + src_uv_stride * GST_ROUND_UP_2 (height) / 2;
copy_plane (dest.y, dest.y_width, dest.y_height, dest.y_stride,
src.y, src.y_width, src.y_height, src.y_stride,
enc->offset_x, enc->offset_y, enc->border, 0);
if (enc->border != BORDER_NONE) {
/* fill top border */
for (i = 0; i < enc->offset_y; i++) {
memset (dest_y, 0, dst_y_stride);
dest_y += dst_y_stride;
}
} else {
dest_y += dst_y_stride * enc->offset_y;
}
offset_x = enc->offset_x;
right_x = width + enc->offset_x;
right_border = dst_y_stride - right_x;
/* copy Y plane */
for (i = 0; i < height; i++) {
memcpy (dest_y + offset_x, src_y, width);
if (enc->border != BORDER_NONE) {
memset (dest_y, 0, offset_x);
memset (dest_y + right_x, 0, right_border);
}
dest_y += dst_y_stride;
src_y += src_y_stride;
}
if (enc->border != BORDER_NONE) {
/* fill bottom border */
for (i = height + enc->offset_y; i < enc->info.height; i++) {
memset (dest_y, 0, dst_y_stride);
dest_y += dst_y_stride;
}
/* fill top border chroma */
for (i = 0; i < enc->offset_y / 2; i++) {
memset (dest_u, 128, dst_uv_stride);
memset (dest_v, 128, dst_uv_stride);
dest_u += dst_uv_stride;
dest_v += dst_uv_stride;
}
} else {
dest_u += dst_uv_stride * enc->offset_y / 2;
dest_v += dst_uv_stride * enc->offset_y / 2;
}
offset_x = enc->offset_x / 2;
right_x = cwidth + offset_x;
right_border = dst_uv_stride - right_x;
/* copy UV planes */
for (i = 0; i < cheight; i++) {
memcpy (dest_v + offset_x, src_v, cwidth);
memcpy (dest_u + offset_x, src_u, cwidth);
if (enc->border != BORDER_NONE) {
memset (dest_u, 128, offset_x);
memset (dest_u + right_x, 128, right_border);
memset (dest_v, 128, offset_x);
memset (dest_v + right_x, 128, right_border);
}
dest_u += dst_uv_stride;
dest_v += dst_uv_stride;
src_u += src_uv_stride;
src_v += src_uv_stride;
}
if (enc->border != BORDER_NONE) {
/* fill bottom border */
for (i = cheight + enc->offset_y / 2; i < enc->info_height / 2; i++) {
memset (dest_u, 128, dst_uv_stride);
memset (dest_v, 128, dst_uv_stride);
dest_u += dst_uv_stride;
dest_v += dst_uv_stride;
}
}
copy_plane (dest.u, dest.uv_width, dest.uv_height, dest.uv_stride,
src.u, src.uv_width, src.uv_height, src.uv_stride,
enc->offset_x / 2, enc->offset_y / 2, enc->border, 128);
copy_plane (dest.v, dest.uv_width, dest.uv_height, dest.uv_stride,
src.v, src.uv_width, src.uv_height, src.uv_stride,
enc->offset_x / 2, enc->offset_y / 2, enc->border, 128);
gst_buffer_unref (buffer);
return newbuf;