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theora: Don't always round to even width/height

Browse source 
Previously, the code always rounded to even sizes. Now it only ensures
that pic_x and pic_y are multiples of 2 if the output format requires
it.

Also inlcudes fixes to take pic_x/y into account properly when copying
the buffer.

https://bugzilla.gnome.org/show_bug.cgi?id=594729
This commit is contained in:
Benjamin Otte 2009-09-10 09:36:31 +02:00
parent 0ac35d8555
commit a3e92d3078
1 changed files with 25 additions and 19 deletions
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44
ext/theora/theoradec.c
View file

@ -909,16 +909,25 @@ theora_handle_type_packet (GstTheoraDec * dec, ogg_packet * packet)
}
if (dec->crop) {
/* add black borders to make width/height/offsets even. we need this because
* we cannot express an offset to the peer plugin. */
dec->width = GST_ROUND_UP_2 (dec->info.pic_width + (dec->info.pic_x & 1));
dec->height = GST_ROUND_UP_2 (dec->info.pic_height + (dec->info.pic_y & 1));
dec->offset_x = dec->info.pic_x & ~1;
dec->offset_y = dec->info.pic_y & ~1;
} else {
/* no cropping, use the encoded dimensions */
dec->width = dec->info.pic_width;
dec->height = dec->info.pic_height;
dec->offset_x = dec->info.pic_x;
dec->offset_y = dec->info.pic_y;
/* Ensure correct offsets in chroma for formats that need it
* by rounding the offset. libtheora will add proper pixels,
* so no need to handle them ourselves. */
if (dec->offset_x & 1 && dec->info.pixel_fmt != TH_PF_444) {
dec->offset_x--;
dec->width++;
}
if (dec->offset_y & 1 && dec->info.pixel_fmt == TH_PF_420) {
dec->offset_y--;
dec->height++;
}
} else {
/* no cropping, use the encoded dimensions */
dec->width = dec->info.frame_width;
dec->height = dec->info.frame_height;
dec->offset_x = 0;
dec->offset_y = 0;
}
@ -1176,7 +1185,7 @@ theora_handle_422_image (GstTheoraDec * dec, th_ycbcr_buffer buf,
GstBuffer ** out)
{
gint width = dec->width;
gint uvwidth = dec->width / 2;
gint uvwidth = GST_ROUND_UP_2 (dec->width) / 2;
gint height = dec->height;
gint out_size;
gint ystride, uvstride;
@ -1198,21 +1207,21 @@ theora_handle_422_image (GstTheoraDec * dec, th_ycbcr_buffer buf,
dst = GST_BUFFER_DATA (*out);
src = buf[0].data;
src = buf[0].data + dec->offset_x + dec->offset_y * buf[0].stride;
for (i = 0; i < height; i++) {
memcpy (dst, src, width);
src += buf[0].stride;
dst += ystride;
}
src = buf[1].data;
src = buf[1].data + dec->offset_x / 2 + dec->offset_y * buf[1].stride;
for (i = 0; i < height; i++) {
memcpy (dst, src, uvwidth);
src += buf[1].stride;
dst += uvstride;
}
src = buf[2].data;
src = buf[2].data + dec->offset_x / 2 + dec->offset_y * buf[2].stride;
for (i = 0; i < height; i++) {
memcpy (dst, src, uvwidth);
src += buf[2].stride;
@ -1234,8 +1243,8 @@ theora_handle_420_image (GstTheoraDec * dec, th_ycbcr_buffer buf,
{
gint width = dec->width;
gint height = dec->height;
gint cwidth = width / 2;
gint cheight = height / 2;
gint cwidth = GST_ROUND_UP_2 (width) / 2;
gint cheight = GST_ROUND_UP_2 (height) / 2;
gint out_size;
gint stride_y, stride_uv;
GstFlowReturn result;
@ -1269,7 +1278,6 @@ theora_handle_420_image (GstTheoraDec * dec, th_ycbcr_buffer buf,
guchar *dest_y, *src_y;
guchar *dest_u, *src_u;
guchar *dest_v, *src_v;
gint offset;
dest_y = GST_BUFFER_DATA (*out);
dest_u = dest_y + stride_y * GST_ROUND_UP_2 (height);
@ -1290,10 +1298,8 @@ theora_handle_420_image (GstTheoraDec * dec, th_ycbcr_buffer buf,
src_y += buf[0].stride;
}
offset = dec->offset_x / 2 + dec->offset_y / 2 * buf[1].stride;
src_u = buf[1].data + offset;
src_v = buf[2].data + offset;
src_u = buf[1].data + dec->offset_x / 2 + dec->offset_y / 2 * buf[1].stride;
src_v = buf[2].data + dec->offset_x / 2 + dec->offset_y / 2 * buf[2].stride;
for (i = 0; i < cheight; i++) {
memcpy (dest_u, src_u, cwidth);