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lavd/xv: keep aspect ratio

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Signed-off-by: Lukasz Marek <lukasz.m.luki2@gmail.com>
This commit is contained in:
Lukasz Marek 2014-04-18 19:31:52 +02:00
parent d340dabb76
commit 5053897b6a
1 changed files with 68 additions and 2 deletions
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70
libavdevice/xv.c
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@ -47,6 +47,8 @@ typedef struct {
char *window_title;
int window_width, window_height;
int window_x, window_y;
int dest_x, dest_y; /**< display area position */
unsigned int dest_w, dest_h; /**< display area dimensions */
Display* display;
char *display_name;
@ -103,6 +105,8 @@ static int xv_write_header(AVFormatContext *s)
unsigned int num_adaptors;
XvAdaptorInfo *ai;
XvImageFormatValues *fv;
XColor fgcolor;
XWindowAttributes window_attrs;
int num_formats = 0, j, tag, ret;
AVCodecContext *encctx = s->streams[0]->codec;
@ -199,12 +203,50 @@ static int xv_write_header(AVFormatContext *s)
XSync(xv->display, False);
shmctl(xv->yuv_shminfo.shmid, IPC_RMID, 0);
XGetWindowAttributes(xv->display, xv->window, &window_attrs);
fgcolor.red = fgcolor.green = fgcolor.blue = 0;
fgcolor.flags = DoRed | DoGreen | DoBlue;
XAllocColor(xv->display, window_attrs.colormap, &fgcolor);
XSetForeground(xv->display, xv->gc, fgcolor.pixel);
//force display area recalculation at first frame
xv->window_width = xv->window_height = 0;
return 0;
fail:
xv_write_trailer(s);
return ret;
}
static void compute_display_area(AVFormatContext *s)
{
XVContext *xv = s->priv_data;
AVRational sar, dar; /* sample and display aspect ratios */
AVStream *st = s->streams[0];
AVCodecContext *encctx = st->codec;
/* compute overlay width and height from the codec context information */
sar = st->sample_aspect_ratio.num ? st->sample_aspect_ratio : (AVRational){ 1, 1 };
dar = av_mul_q(sar, (AVRational){ encctx->width, encctx->height });
/* we suppose the screen has a 1/1 sample aspect ratio */
/* fit in the window */
if (av_cmp_q(dar, (AVRational){ xv->dest_w, xv->dest_h }) > 0) {
/* fit in width */
xv->dest_y = xv->dest_h;
xv->dest_x = 0;
xv->dest_h = av_rescale(xv->dest_w, dar.den, dar.num);
xv->dest_y -= xv->dest_h;
xv->dest_y /= 2;
} else {
/* fit in height */
xv->dest_x = xv->dest_w;
xv->dest_y = 0;
xv->dest_w = av_rescale(xv->dest_h, dar.num, dar.den);
xv->dest_x -= xv->dest_w;
xv->dest_x /= 2;
}
}
static int write_picture(AVFormatContext *s, AVPicture *pict)
{
XVContext *xv = s->priv_data;
@ -219,9 +261,33 @@ static int write_picture(AVFormatContext *s, AVPicture *pict)
av_image_copy(data, img->pitches, (const uint8_t **)pict->data, pict->linesize,
xv->image_format, img->width, img->height);
XGetWindowAttributes(xv->display, xv->window, &window_attrs);
if (window_attrs.width != xv->window_width || window_attrs.height != xv->window_height) {
XRectangle rect[2];
xv->dest_w = window_attrs.width;
xv->dest_h = window_attrs.height;
compute_display_area(s);
if (xv->dest_x) {
rect[0].width = rect[1].width = xv->dest_x;
rect[0].height = rect[1].height = window_attrs.height;
rect[0].y = rect[1].y = 0;
rect[0].x = 0;
rect[1].x = xv->dest_w + xv->dest_x;
XFillRectangles(xv->display, xv->window, xv->gc, rect, 2);
}
if (xv->dest_y) {
rect[0].width = rect[1].width = window_attrs.width;
rect[0].height = rect[1].height = xv->dest_y;
rect[0].x = rect[1].x = 0;
rect[0].y = 0;
rect[1].y = xv->dest_h + xv->dest_y;
XFillRectangles(xv->display, xv->window, xv->gc, rect, 2);
}
}
if (XvShmPutImage(xv->display, xv->xv_port, xv->window, xv->gc,
xv->yuv_image, 0, 0, xv->image_width, xv->image_height, 0, 0,
window_attrs.width, window_attrs.height, True) != Success) {
xv->yuv_image, 0, 0, xv->image_width, xv->image_height,
xv->dest_x, xv->dest_y, xv->dest_w, xv->dest_h, True) != Success) {
av_log(s, AV_LOG_ERROR, "Could not copy image to XV shared memory buffer\n");
return AVERROR_EXTERNAL;
}