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theoradec: for 4:2:2, use Y42B (planar) rather than a packed format.

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This commit is contained in:
Michael Smith 2009-05-18 22:29:07 -07:00
parent c94f952056
commit 94ca1b005e
1 changed files with 28 additions and 53 deletions
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81
ext/theora/theoradec.c
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@ -66,7 +66,7 @@ GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw-yuv, "
"format = (fourcc) { I420, YUY2, Y444 }, "
"format = (fourcc) { I420, Y42B, Y444 }, "
"framerate = (fraction) [0/1, MAX], "
"width = (int) [ 1, MAX ], " "height = (int) [ 1, MAX ]")
);
@ -895,7 +895,7 @@ theora_handle_type_packet (GstTheoraDec * dec, ogg_packet * packet)
fourcc = GST_MAKE_FOURCC ('I', '4', '2', '0');
} else if (dec->info.pixelformat == OC_PF_422) {
dec->output_bpp = 16;
fourcc = GST_MAKE_FOURCC ('Y', 'U', 'Y', '2');
fourcc = GST_MAKE_FOURCC ('Y', '4', '2', 'B');
} else if (dec->info.pixelformat == OC_PF_444) {
dec->output_bpp = 24;
fourcc = GST_MAKE_FOURCC ('Y', '4', '4', '4');
@ -1164,19 +1164,22 @@ no_buffer:
}
/* Allocate buffer and copy image data into YUY2 format */
/* Allocate buffer and copy image data into Y42B format */
static GstFlowReturn
theora_handle_422_image (GstTheoraDec * dec, yuv_buffer * yuv, GstBuffer ** out)
{
gint width = dec->width;
gint uvwidth = dec->width / 2;
gint height = dec->height;
gint out_size;
gint stride;
gint ystride, uvstride;
GstFlowReturn result;
int i, j;
int i;
guint8 *dst, *src;
stride = GST_ROUND_UP_2 (width) * 2;
out_size = stride * height;
ystride = GST_ROUND_UP_4 (width);
uvstride = GST_ROUND_UP_8 (width) / 2;
out_size = ystride * height + uvstride * height * 2;
/* now copy over the area contained in offset_x,offset_y,
* frame_width, frame_height */
@ -1186,55 +1189,27 @@ theora_handle_422_image (GstTheoraDec * dec, yuv_buffer * yuv, GstBuffer ** out)
if (G_UNLIKELY (result != GST_FLOW_OK))
goto no_buffer;
/* The output pixels look like:
* YUYVYUYV....
*
* Do the interleaving... Note that this is kinda messed up if our width is
* odd. In that case, we can't represent it properly in YUY2, so we just
* pad out to even in that case (this is why we have GST_ROUND_UP_2() above).
*/
{
guchar *src_y;
guchar *src_cb;
guchar *src_cr;
guchar *dest;
guchar *curdest;
guchar *src;
dst = GST_BUFFER_DATA (*out);
dest = GST_BUFFER_DATA (*out);
src = yuv->y;
for (i = 0; i < height; i++) {
memcpy (dst, src, width);
src += yuv->y_stride;
dst += ystride;
}
src_y = yuv->y + dec->offset_x + dec->offset_y * yuv->y_stride;
src_cb = yuv->u + dec->offset_x / 2 + dec->offset_y * yuv->uv_stride;
src_cr = yuv->v + dec->offset_x / 2 + dec->offset_y * yuv->uv_stride;
src = yuv->u;
for (i = 0; i < height; i++) {
memcpy (dst, src, uvwidth);
src += yuv->uv_stride;
dst += uvstride;
}
for (i = 0; i < height; i++) {
/* Y first */
curdest = dest;
src = src_y;
for (j = 0; j < width; j++) {
*curdest = *src++;
curdest += 2;
}
src_y += yuv->y_stride;
curdest = dest + 1;
src = src_cb;
for (j = 0; j < width / 2; j++) {
*curdest = *src++;
curdest += 4;
}
src_cb += yuv->uv_stride;
curdest = dest + 3;
src = src_cr;
for (j = 0; j < width / 2; j++) {
*curdest = *src++;
curdest += 4;
}
src_cr += yuv->uv_stride;
dest += stride;
}
src = yuv->v;
for (i = 0; i < height; i++) {
memcpy (dst, src, uvwidth);
src += yuv->uv_stride;
dst += uvstride;
}
no_buffer: