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livetrax/gtk2_ardour/video_image_frame.cc

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/*
Copyright (C) 2010, 2013 Paul Davis
Author: Robin Gareus <robin@gareus.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sigc++/bind.h>
#include "ardour/tempo.h"
#include "ardour_ui.h"
#include "video_image_frame.h"
#include "public_editor.h"
#include "utils.h"
#include "canvas/group.h"
#include "utils_videotl.h"
#include <gtkmm2ext/utils.h>
#include <pthread.h>
#include "i18n.h"
using namespace std;
using namespace ARDOUR;
using namespace VideoUtils;
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static void freedata_cb (uint8_t *d, void* /*arg*/) {
/* later this can be used with libharvid
* the buffer/videocacheline instead of freeing it
*/
free (d);
}
VideoImageFrame::VideoImageFrame (PublicEditor& ed, ArdourCanvas::Group& parent, int w, int h, std::string vsurl, std::string vfn)
: editor (ed)
, _parent(&parent)
, clip_width(w)
, clip_height(h)
, video_server_url(vsurl)
, video_filename(vfn)
{
pthread_mutex_init(&request_lock, NULL);
pthread_mutex_init(&queue_lock, NULL);
queued_request=false;
video_frame_number = -1;
rightend = -1;
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sample_position = 0;
thread_active=false;
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unit_position = editor.sample_to_pixel (sample_position);
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image = new ArdourCanvas::Image (_parent, Cairo::FORMAT_ARGB32, clip_width, clip_height);
img = image->get_image();
fill_frame(0, 0, 0);
draw_line();
draw_x();
image->put_image(img);
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image->Event.connect (sigc::bind (sigc::mem_fun (editor, &PublicEditor::canvas_videotl_bar_event), _parent));
}
VideoImageFrame::~VideoImageFrame ()
{
if (thread_active) pthread_join(thread_id_tt, NULL);
delete image;
pthread_mutex_destroy(&request_lock);
pthread_mutex_destroy(&queue_lock);
}
void
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VideoImageFrame::set_position (framepos_t sample)
{
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double new_unit_position = editor.sample_to_pixel (sample);
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image->move (ArdourCanvas::Duple (new_unit_position - unit_position, 0.0));
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sample_position = sample;
unit_position = new_unit_position;
}
void
VideoImageFrame::reposition ()
{
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set_position (sample_position);
}
void
VideoImageFrame::exposeimg () {
ImgChanged(); /* EMIT SIGNAL */
}
void
VideoImageFrame::set_videoframe (framepos_t videoframenumber, int re)
{
if (video_frame_number == videoframenumber && rightend == re) return;
video_frame_number = videoframenumber;
rightend = re;
img = image->get_image();
fill_frame(0, 0, 0);
draw_x();
draw_line();
cut_rightend();
image->put_image(img);
exposeimg();
/* request video-frame from decoder in background thread */
http_get(video_frame_number);
}
void
VideoImageFrame::draw_line ()
{
const int rowstride = img->stride;
const int clip_height = img->height;
uint8_t *pixels, *p;
pixels = img->data;
int y;
for (y = 0;y < clip_height; y++) {
p = pixels + y * rowstride;
p[0] = 255; p[1] = 255; p[2] = 255; p[3] = 255;
}
}
void
VideoImageFrame::fill_frame (const uint8_t r, const uint8_t g, const uint8_t b)
{
const int rowstride = img->stride;
const int clip_height = img->height;
const int clip_width = img->width;
uint8_t *pixels, *p;
pixels = img->data;
int x,y;
for (y = 0; y < clip_height; ++y) {
for (x = 0; x < clip_width; ++x) {
p = pixels + y * rowstride + x * 4;
p[0] = b; p[1] = g; p[2] = r; p[3] = 255;
}
}
}
void
VideoImageFrame::draw_x ()
{
int x,y;
const int rowstride = img->stride;
const int clip_width = img->width;
const int clip_height = img->height;
uint8_t *pixels, *p;
pixels = img->data;
for (x = 0;x < clip_width; x++) {
y = clip_height * x / clip_width;
p = pixels + y * rowstride + x * 4;
p[0] = 192; p[1] = 192; p[2] = 192; p[3] = 255;
p = pixels + y * rowstride + (clip_width-x-1) * 4;
p[0] = 192; p[1] = 192; p[2] = 192; p[3] = 255;
}
}
void
VideoImageFrame::cut_rightend ()
{
if (rightend < 0 ) { return; }
const int rowstride = img->stride;
const int clip_height = img->height;
const int clip_width = img->width;
uint8_t *pixels, *p;
pixels = img->data;
if (rightend > clip_width) { return; }
int x,y;
for (y = 0;y < clip_height; ++y) {
p = pixels + y * rowstride + rightend * 4;
p[0] = 192; p[1] = 192; p[2] = 192; p[3] = 255;
for (x=rightend+1; x < clip_width; ++x) {
p = pixels + y * rowstride + x * 4;
p[0] = 0; p[1] = 0; p[2] = 0; p[3] = 0;
}
}
}
void *
http_get_thread (void *arg) {
VideoImageFrame *vif = static_cast<VideoImageFrame *>(arg);
char url[2048];
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
snprintf(url, sizeof(url), "%s?frame=%li&w=%d&h=%di&file=%s&format=bgra",
vif->get_video_server_url().c_str(),
(long int) vif->get_req_frame(), vif->get_width(), vif->get_height(),
vif->get_video_filename().c_str()
);
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int status = 0;
int timeout = 1000; // * 5ms -> 5sec
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char *res = NULL;
do {
res=a3_curl_http_get(url, &status);
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if (status == 503) Glib::usleep(5000); // try-again
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} while (status == 503 && --timeout > 0);
if (status != 200 || !res) {
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printf("no-video frame: video-server returned http-status: %d\n", status);
}
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
vif->http_download_done(res);
pthread_exit(0);
return 0;
}
void
VideoImageFrame::http_download_done (char *data){
if (queued_request) {
http_get_again(want_video_frame_number);
return;
}
if (!data) {
/* Image request failed (HTTP error or timeout) */
img = image->get_image();
fill_frame(128, 0, 0);
draw_x();
cut_rightend();
draw_line();
cut_rightend();
image->put_image(img);
} else {
img = image->get_image(false);
img->data = (uint8_t*) data;
img->destroy_callback = &freedata_cb;
draw_line();
cut_rightend();
image->put_image(img);
}
exposeimg();
/* don't request frames too quickly, wait after user has zoomed */
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Glib::usleep(40000);
if (queued_request) {
http_get_again(want_video_frame_number);
}
pthread_mutex_unlock(&request_lock);
}
void
VideoImageFrame::http_get(framepos_t fn) {
if (pthread_mutex_trylock(&request_lock)) {
pthread_mutex_lock(&queue_lock);
queued_request=true;
want_video_frame_number=fn;
pthread_mutex_unlock(&queue_lock);
return;
}
if (thread_active) pthread_join(thread_id_tt, NULL);
pthread_mutex_lock(&queue_lock);
queued_request=false;
req_video_frame_number=fn;
pthread_mutex_unlock(&queue_lock);
int rv = pthread_create(&thread_id_tt, NULL, http_get_thread, this);
thread_active=true;
if (rv) {
thread_active=false;
printf("thread creation failed. %i\n",rv);
http_download_done(NULL);
}
}
void
VideoImageFrame::http_get_again(framepos_t /*fn*/) {
pthread_mutex_lock(&queue_lock);
queued_request=false;
req_video_frame_number=want_video_frame_number;
pthread_mutex_unlock(&queue_lock);
http_get_thread(this);
}