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generic-pc/video: implement getScreenImage (experimental)

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This commit is contained in:
Stefan Seyfried
2013-05-26 20:52:43 +02:00
parent 40d1bb8b63
commit adb6db1beb
2 changed files with 106 additions and 0 deletions
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105
generic-pc/video.cpp
View File

@@ -44,6 +44,7 @@ extern "C" {
#include "lt_debug.h"
#define lt_debug(args...) _lt_debug(TRIPLE_DEBUG_VIDEO, this, args)
#define lt_info(args...) _lt_info(TRIPLE_DEBUG_VIDEO, this, args)
#define lt_info_c(args...) _lt_info(TRIPLE_DEBUG_VIDEO, NULL, args)
cVideo *videoDecoder = NULL;
extern cDemux *videoDemux;
@@ -540,3 +541,107 @@ void cVideo::run(void)
buf_out = 0;
lt_info("======================== end decoder thread ================================\n");
}
static bool swscale(unsigned char *src, unsigned char *dst, int sw, int sh, int dw, int dh)
{
bool ret = false;
struct SwsContext *scale = NULL;
AVFrame *sframe, *dframe;
scale = sws_getCachedContext(scale, sw, sh, PIX_FMT_RGB32, dw, dh, PIX_FMT_RGB32, SWS_BICUBIC, 0, 0, 0);
if (!scale) {
lt_info_c("%s: ERROR setting up SWS context\n", __func__);
return false;
}
sframe = avcodec_alloc_frame();
dframe = avcodec_alloc_frame();
if (!sframe || !dframe) {
lt_info_c("%s: could not alloc sframe (%p) or dframe (%p)\n", __func__, sframe, dframe);
goto out;
}
avpicture_fill((AVPicture *)sframe, &(src[0]), PIX_FMT_RGB32, sw, sh);
avpicture_fill((AVPicture *)dframe, &(dst[0]), PIX_FMT_RGB32, dw, dh);
sws_scale(scale, sframe->data, sframe->linesize, 0, sh, dframe->data, dframe->linesize);
out:
avcodec_free_frame(&sframe);
avcodec_free_frame(&dframe);
sws_freeContext(scale);
return ret;
}
bool cVideo::GetScreenImage(unsigned char * &data, int &xres, int &yres, bool get_video, bool get_osd, bool scale_to_video)
{
lt_info("%s: data 0x%p xres %d yres %d vid %d osd %d scale %d\n",
__func__, data, xres, yres, get_video, get_osd, scale_to_video);
SWFramebuffer video;
std::vector<unsigned char> *osd = NULL;
std::vector<unsigned char> s_osd; /* scaled OSD */
int vid_w = 0, vid_h = 0;
int osd_w = glfb->getOSDWidth();
int osd_h = glfb->getOSDHeight();
xres = osd_w;
yres = osd_h;
if (get_video) {
buf_m.lock();
video = buffers[buf_out];
buf_m.unlock();
vid_w = video.width();
vid_h = video.height();
if (scale_to_video || !get_osd) {
xres = vid_w;
yres = vid_h;
AVRational a = video.AR();
/* TODO: this does not consider display_aspect and display_crop */
if (a.num > 0 && a.den > 0)
xres = vid_w * a.num / a.den;
}
}
if (get_osd)
osd = glfb->getOSDBuffer();
unsigned int need = avpicture_get_size(PIX_FMT_RGB32, xres, yres);
data = (unsigned char *)realloc(data, need); /* will be freed by caller */
if (data == NULL) /* out of memory? */
return false;
if (get_video) {
if (vid_w != xres || vid_h != yres) /* scale video into data... */
swscale(&video[0], data, vid_w, vid_h, xres, yres);
else /* get_video and no fancy scaling needed */
memcpy(data, &video[0], xres * yres * sizeof(uint32_t));
}
if (get_osd && (osd_w != xres || osd_h != yres)) {
/* rescale osd */
s_osd.resize(need);
swscale(&(*osd)[0], &s_osd[0], osd_w, osd_h, xres, yres);
osd = &s_osd;
}
if (get_video && get_osd) {
/* alpha blend osd onto data (video). TODO: maybe libavcodec can do this? */
uint32_t *d = (uint32_t *)data;
uint32_t *pixpos = (uint32_t *)&(*osd)[0];
for (int count = 0; count < yres; count++) {
for (int count2 = 0; count2 < xres; count2++ ) {
uint32_t pix = *pixpos;
if ((pix & 0xff000000) == 0xff000000)
*d = pix;
else {
uint8_t *in = (uint8_t *)(pixpos);
uint8_t *out = (uint8_t *)d;
int a = in[3]; /* TODO: big/little endian? */
*out = (*out + ((*in - *out) * a) / 256);
in++; out++;
*out = (*out + ((*in - *out) * a) / 256);
in++; out++;
*out = (*out + ((*in - *out) * a) / 256);
}
d++;
pixpos++;
}
}
}
else if (get_osd) /* only get_osd, data is not yet populated */
memcpy(data, &(*osd)[0], xres * yres * sizeof(uint32_t));
return true;
}

1
generic-pc/video_lib.h
View File

@@ -190,6 +190,7 @@ class cVideo : public OpenThreads::Thread
int CloseVBI(void) { return 0; };
int StartVBI(unsigned short) { return 0; };
int StopVBI(void) { return 0; };
bool GetScreenImage(unsigned char * &data, int &xres, int &yres, bool get_video = true, bool get_osd = false, bool scale_to_video = false);
SWFramebuffer *getDecBuf(void);
private:
void run();