/*
* The purpose of this thread is to make this module async signal safe.
* ie: it couldn't be called safely from a sighandler if host process
* use ALSA async mode and write to ALSA API from a sighandler.
*/
void *alsa_hook_thread(void *argptr)
{
struct alsa_hook_stream_s *stream = (struct alsa_hook_stream_s *) argptr;
glc_audio_data_header_t hdr;
glc_message_header_t msg_hdr;
int ret = 0;
msg_hdr.type = GLC_MESSAGE_AUDIO_DATA;
hdr.id = stream->id;
stream->capture_ready = 1;
while (1) {
sem_wait(&stream->capture_full);
stream->capture_ready = 0;
if (unlikely(!stream->thread.running))
break;
if (unlikely(stream->capture_size < 0)) {
alsa_hook_realloc_capture_buf(stream,-stream->capture_size);
goto capture_ready;
}
hdr.time = stream->capture_time;
hdr.size = stream->capture_size;
if (unlikely((ret = ps_packet_open(&stream->packet, PS_PACKET_WRITE))))
break;
if (unlikely((ret = ps_packet_setsize(&stream->packet, hdr.size
+ sizeof(glc_message_header_t)
+ sizeof(glc_audio_data_header_t)))))
break;
if (unlikely((ret = ps_packet_write(&stream->packet, &msg_hdr,
sizeof(glc_message_header_t)))))
break;
if (unlikely((ret = ps_packet_write(&stream->packet, &hdr,
sizeof(glc_audio_data_header_t)))))
break;
if (unlikely((ret = ps_packet_write(&stream->packet,
stream->capture_data, hdr.size))))
break;
if (unlikely((ret = ps_packet_close(&stream->packet))))
break;
if (!(stream->mode & SND_PCM_ASYNC))
sem_post(&stream->capture_empty);
capture_ready:
stream->capture_ready = 1;
}
if (ret != 0)
glc_log(stream->alsa_hook->glc, GLC_ERROR, "alsa_hook",
"thread failed: %s (%d)", strerror(ret), ret);
return NULL;
}
/*
* multithreading notes:
*
* This function could be accessed concurrently for different video streams, with
* the pair dpy,drawable identifying each stream.
*/
int gl_capture_frame(gl_capture_t gl_capture, Display *dpy, GLXDrawable drawable)
{
struct gl_capture_video_stream_s *video;
glc_message_header_t msg;
glc_video_frame_header_t pic;
glc_utime_t now;
glc_utime_t before_capture,after_capture;
char *dma;
int ret = 0;
if (!(gl_capture->flags & GL_CAPTURE_CAPTURING))
return 0; /* capturing not active */
gl_capture_get_video_stream(gl_capture, &video, dpy, drawable);
/* get current time */
if (unlikely(gl_capture->flags & GL_CAPTURE_IGNORE_TIME))
now = video->last + gl_capture->fps;
else
now = glc_state_time(gl_capture->glc);
/* has gl_capture->fps nanoseconds elapsed since last capture */
if ((now - video->last < gl_capture->fps) &&
!(gl_capture->flags & GL_CAPTURE_LOCK_FPS) &&
!(gl_capture->flags & GL_CAPTURE_IGNORE_TIME))
goto finish;
/* not really needed until now */
gl_capture_update_video_stream(gl_capture, video);
/* if PBO is not active, just start transfer and finish */
if (unlikely((gl_capture->flags & GL_CAPTURE_USE_PBO) &&
__sync_bool_compare_and_swap(&video->pbo_active,0,1))) {
ret = gl_capture_start_pbo(gl_capture, video);
video->pbo_time = now;
goto finish;
}
if (unlikely(ps_packet_open(&video->packet,
((gl_capture->flags & GL_CAPTURE_LOCK_FPS) ||
(gl_capture->flags & GL_CAPTURE_IGNORE_TIME)) ?
(PS_PACKET_WRITE) :
(PS_PACKET_WRITE | PS_PACKET_TRY))))
goto finish;
if (unlikely((ret = ps_packet_setsize(&video->packet, video->row * video->ch
+ sizeof(glc_message_header_t)
+ sizeof(glc_video_frame_header_t)))))
goto cancel;
msg.type = GLC_MESSAGE_VIDEO_FRAME;
if (unlikely((ret = ps_packet_write(&video->packet,
&msg, sizeof(glc_message_header_t)))))
goto cancel;
/*
* if we are using PBO we will actually write previous picture to buffer.
* Also, make sure that pbo_time is not in the future. This could happen if
* the state time is reset by reloading the capture between a pbo start
* and a pbo read.
*/
pic.time = (gl_capture->flags & GL_CAPTURE_USE_PBO &&
video->pbo_time < now)?video->pbo_time:now;
pic.id = video->id;
if (unlikely((ret = ps_packet_write(&video->packet,
&pic, sizeof(glc_video_frame_header_t)))))
goto cancel;
if (video->gather_stats)
before_capture = glc_state_time(gl_capture->glc);
if (gl_capture->flags & GL_CAPTURE_USE_PBO) {
if (unlikely((ret = gl_capture_read_pbo(gl_capture, video))))
goto cancel;
ret = gl_capture_start_pbo(gl_capture, video);
video->pbo_time = now;
} else {
if (unlikely((ret = ps_packet_dma(&video->packet, (void *) &dma,
video->row * video->ch, PS_ACCEPT_FAKE_DMA))))
goto cancel;
ret = gl_capture_get_pixels(gl_capture, video, dma);
}
if (video->gather_stats) {
after_capture = glc_state_time(gl_capture->glc);
video->capture_time_ns += after_capture - before_capture;
}
ps_packet_close(&video->packet);
video->num_frames++;
now = glc_state_time(gl_capture->glc);
if (unlikely((gl_capture->flags & GL_CAPTURE_LOCK_FPS) &&
!(gl_capture->flags & GL_CAPTURE_IGNORE_TIME))) {
if (now - video->last < gl_capture->fps) {
struct timespec ts = { .tv_sec = (gl_capture->fps + video->last - now)/1000000000,
.tv_nsec = (gl_capture->fps + video->last - now)%1000000000 };
nanosleep(&ts,NULL);
}
}
/* increment by 1/fps seconds */
video->last += gl_capture->fps;
finish:
if (unlikely(ret != 0))
gl_capture_error(gl_capture, ret);
if (gl_capture->flags & GL_CAPTURE_DRAW_INDICATOR)
glCallList(video->indicator_list);
return ret;
cancel:
if (ret == EBUSY) {
ret = 0;
glc_log(gl_capture->glc, GLC_INFO, "gl_capture",
"dropped frame, buffer not ready");
}
ps_packet_cancel(&video->packet);
goto finish;
}
int gl_capture_refresh_color_correction(gl_capture_t gl_capture)
{
struct gl_capture_video_stream_s *video;
if (unlikely(!(gl_capture->flags & GL_CAPTURE_CAPTURING)))
return 0; /* capturing not active */
glc_log(gl_capture->glc, GLC_INFO, "gl_capture",
"refreshing color correction");
pthread_rwlock_rdlock(&gl_capture->videolist_lock);
video = gl_capture->video;
while (video != NULL) {
gl_capture_update_color(gl_capture, video);
video = video->next;
}
pthread_rwlock_unlock(&gl_capture->videolist_lock);
return 0;
}
/** \todo support GammaRamp */
int gl_capture_update_color(gl_capture_t gl_capture, struct gl_capture_video_stream_s *video)
{
glc_message_header_t msg_hdr;
glc_color_message_t msg;
XF86VidModeGamma gamma;
int ret = 0;
XF86VidModeGetGamma(video->dpy, video->screen, &gamma);
if ((gamma.red == video->gamma_red) &&
(gamma.green == video->gamma_green) &&
(gamma.blue == video->gamma_blue))
return 0; /* nothing to update */
msg_hdr.type = GLC_MESSAGE_COLOR;
msg.id = video->id;
msg.red = gamma.red;
msg.green = gamma.green;
msg.blue = gamma.blue;
/** \todo figure out brightness and contrast */
msg.brightness = msg.contrast = 0;
glc_log(gl_capture->glc, GLC_INFO, "gl_capture",
"color correction: brightness=%f, contrast=%f, red=%f, green=%f, blue=%f",
msg.brightness, msg.contrast, msg.red, msg.green, msg.blue);
if (unlikely((ret = ps_packet_open(&video->packet, PS_PACKET_WRITE))))
goto err;
if (unlikely((ret = ps_packet_write(&video->packet,
&msg_hdr, sizeof(glc_message_header_t)))))
goto err;
if (unlikely((ret = ps_packet_write(&video->packet,
&msg, sizeof(glc_color_message_t)))))
goto err;
if (unlikely((ret = ps_packet_close(&video->packet))))
goto err;
return 0;
err:
ps_packet_cancel(&video->packet);
glc_log(gl_capture->glc, GLC_ERROR, "gl_capture",
"can't write gamma correction information to buffer: %s (%d)",
strerror(ret), ret);
return ret;
}
