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#include <stdlib.h>
#include <time.h>
#include "til.h"
#include "til_fb.h"
#include "til_settings.h"
#include "til_util.h"
#include "txt/txt.h"
/* Copyright (C) 2019 - Vito Caputo <vcaputo@pengaru.com> */
/* This implements an MTV-inspired random slideshow of rototiller modules.
*
* Some TODO items:
* - optionally persist module contexts so they resume rather than restart
*/
#define RTV_SNOW_DURATION_SECS 1
#define RTV_DURATION_SECS 15
#define RTV_CAPTION_DURATION_SECS 5
#define RTV_CONTEXT_DURATION_SECS 60
#define RTV_DEFAULT_SNOW_MODULE "snow"
typedef struct rtv_channel_t {
const til_module_t *module;
void *module_ctxt;
til_setup_t *module_setup;
time_t last_on_time, cumulative_time;
char *settings_as_arg;
txt_t *caption;
unsigned order;
} rtv_channel_t;
typedef struct rtv_context_t {
time_t next_switch, next_hide_caption;
rtv_channel_t *channel, *last_channel;
txt_t *caption;
unsigned duration;
unsigned context_duration;
unsigned snow_duration;
unsigned caption_duration;
rtv_channel_t snow_channel;
size_t n_channels;
rtv_channel_t channels[];
} rtv_context_t;
typedef struct rtv_setup_t {
til_setup_t til_setup;
unsigned duration;
unsigned context_duration;
unsigned snow_duration;
unsigned caption_duration;
char *snow_module;
char *channels[];
} rtv_setup_t;
static void setup_next_channel(rtv_context_t *ctxt, unsigned ticks);
static void * rtv_create_context(unsigned ticks, unsigned n_cpus, til_setup_t *setup);
static void rtv_destroy_context(void *context);
static void rtv_prepare_frame(void *context, unsigned ticks, unsigned n_cpus, til_fb_fragment_t *fragment, til_fragmenter_t *res_fragmenter);
static void rtv_finish_frame(void *context, unsigned ticks, til_fb_fragment_t *fragment);
static int rtv_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup);
static rtv_setup_t rtv_default_setup = {
.duration = RTV_DURATION_SECS,
.context_duration = RTV_CONTEXT_DURATION_SECS,
.snow_duration = RTV_SNOW_DURATION_SECS,
.caption_duration = RTV_CAPTION_DURATION_SECS,
.snow_module = RTV_DEFAULT_SNOW_MODULE,
.channels = { NULL }, /* NULL == "all" */
};
static til_module_t rtv_none_module = {};
til_module_t rtv_module = {
.create_context = rtv_create_context,
.destroy_context = rtv_destroy_context,
.prepare_frame = rtv_prepare_frame,
.finish_frame = rtv_finish_frame,
.name = "rtv",
.description = "Rototiller TV",
.setup = rtv_setup,
};
static int cmp_channels(const void *p1, const void *p2)
{
const rtv_channel_t *c1 = p1, *c2 = p2;
if (c1->order < c2->order)
return -1;
if (c1->order > c2->order)
return 1;
return 0;
}
static void randomize_channels(rtv_context_t *ctxt)
{
for (size_t i = 0; i < ctxt->n_channels; i++)
ctxt->channels[i].order = rand();
qsort(ctxt->channels, ctxt->n_channels, sizeof(rtv_channel_t), cmp_channels);
}
static void setup_next_channel(rtv_context_t *ctxt, unsigned ticks)
{
time_t now = time(NULL);
/* TODO: most of this module stuff should probably be
* in rototiller.c helpers, but it's harmless for now.
*/
if (ctxt->channel) {
ctxt->channel->cumulative_time += now - ctxt->channel->last_on_time;
if (ctxt->channel->cumulative_time >= ctxt->context_duration) {
ctxt->channel->cumulative_time = 0;
ctxt->channel->module_ctxt = til_module_destroy_context(ctxt->channel->module, ctxt->channel->module_ctxt);
free(ctxt->channel->settings_as_arg);
ctxt->channel->settings_as_arg = NULL;
ctxt->caption = ctxt->channel->caption = txt_free(ctxt->channel->caption);
}
}
if (!ctxt->n_channels ||
(ctxt->channel != &ctxt->snow_channel && (ctxt->snow_channel.module != &rtv_none_module || ctxt->snow_duration))) {
ctxt->last_channel = ctxt->channel;
ctxt->channel = &ctxt->snow_channel;
ctxt->caption = NULL;
ctxt->next_switch = now + ctxt->snow_duration;
} else {
size_t i;
for (i = 0; i < ctxt->n_channels; i++) {
if (&ctxt->channels[i] == ctxt->last_channel) {
i++;
break;
}
}
if (i >= ctxt->n_channels) {
randomize_channels(ctxt);
ctxt->last_channel = NULL;
i = 0;
}
ctxt->channel = &ctxt->channels[i];
if (!ctxt->channel->settings_as_arg) {
char *settings_as_arg = NULL;
txt_t *caption;
(void) til_module_randomize_setup(ctxt->channel->module, &ctxt->channel->module_setup, &settings_as_arg);
caption = txt_newf("Title: %s%s%s\nDescription: %s%s%s",
ctxt->channel->module->name,
ctxt->channel->module->author ? "\nAuthor: " : "",
ctxt->channel->module->author ? : "",
ctxt->channel->module->description,
settings_as_arg ? "\nSettings: " : "",
settings_as_arg ? settings_as_arg : "");
ctxt->caption = ctxt->channel->caption = caption;
ctxt->channel->settings_as_arg = settings_as_arg ? settings_as_arg : strdup("");
}
ctxt->next_switch = now + ctxt->duration;
ctxt->next_hide_caption = now + ctxt->caption_duration;
}
if (!ctxt->channel->module_ctxt)
(void) til_module_create_context(ctxt->channel->module, ticks, ctxt->channel->module_setup, &ctxt->channel->module_ctxt);
ctxt->channel->last_on_time = now;
}
static int rtv_should_skip_module(const rtv_setup_t *setup, const til_module_t *module)
{
if (module == &rtv_module ||
(setup->snow_module && !strcmp(module->name, setup->snow_module)))
return 1;
/* An empty channels list is a special case for representing "all", an
* empty channels setting returns -EINVAL during _setup().
*/
if (!setup->channels[0])
return 0;
for (char * const *channel = setup->channels; *channel; channel++) {
if (!strcmp(module->name, *channel))
return 0;
}
return 1;
}
static void * rtv_create_context(unsigned ticks, unsigned n_cpus, til_setup_t *setup)
{
rtv_context_t *ctxt;
const til_module_t **modules;
size_t n_modules, n_channels = 0;
if (!setup)
setup = &rtv_default_setup.til_setup;
til_get_modules(&modules, &n_modules);
/* how many modules are in the setup? */
for (size_t i = 0; i < n_modules; i++) {
if (!rtv_should_skip_module((rtv_setup_t *)setup, modules[i]))
n_channels++;
}
ctxt = calloc(1, sizeof(rtv_context_t) + n_channels * sizeof(rtv_channel_t));
if (!ctxt)
return NULL;
ctxt->duration = ((rtv_setup_t *)setup)->duration;
ctxt->context_duration = ((rtv_setup_t *)setup)->context_duration;
ctxt->snow_duration = ((rtv_setup_t *)setup)->snow_duration;
ctxt->caption_duration = ((rtv_setup_t *)setup)->caption_duration;
ctxt->snow_channel.module = &rtv_none_module;
if (((rtv_setup_t *)setup)->snow_module) {
ctxt->snow_channel.module = til_lookup_module(((rtv_setup_t *)setup)->snow_module);
(void) til_module_create_context(ctxt->snow_channel.module, ticks, NULL, &ctxt->snow_channel.module_ctxt);
}
for (size_t i = 0; i < n_modules; i++) {
if (!rtv_should_skip_module((rtv_setup_t *)setup, modules[i]))
ctxt->channels[ctxt->n_channels++].module = modules[i];
}
setup_next_channel(ctxt, ticks);
return ctxt;
}
static void rtv_destroy_context(void *context)
{
free(context);
}
static void rtv_prepare_frame(void *context, unsigned ticks, unsigned n_cpus, til_fb_fragment_t *fragment, til_fragmenter_t *res_fragmenter)
{
rtv_context_t *ctxt = context;
time_t now = time(NULL);
if (now >= ctxt->next_switch)
setup_next_channel(ctxt, ticks);
if (now >= ctxt->next_hide_caption)
ctxt->caption = NULL;
/* there's a special-case "none" (or unconfigured) snow module, that just blanks,
* it's a nil module so just implement it here.
*/
if (!ctxt->channel->module->render_fragment &&
!ctxt->channel->module->prepare_frame)
til_fb_fragment_clear(fragment);
else
til_module_render(ctxt->channel->module, ctxt->channel->module_ctxt, ticks, fragment);
}
static void rtv_finish_frame(void *context, unsigned ticks, til_fb_fragment_t *fragment)
{
rtv_context_t *ctxt = context;
if (!ctxt->caption)
return;
txt_render_fragment(ctxt->caption, fragment, 0x00000000,
1, fragment->frame_height + 1,
(txt_align_t){
.horiz = TXT_HALIGN_LEFT,
.vert = TXT_VALIGN_BOTTOM
});
txt_render_fragment(ctxt->caption, fragment, 0xffffffff,
0, fragment->frame_height,
(txt_align_t){
.horiz = TXT_HALIGN_LEFT,
.vert = TXT_VALIGN_BOTTOM
});
}
static int rtv_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup)
{
const char *channels;
const char *duration;
const char *context_duration;
const char *caption_duration;
const char *snow_duration;
const char *snow_module;
int r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Colon-separated list of channel modules",
.key = "channels",
.preferred = "all",
.annotations = NULL
},
&channels,
res_setting,
res_desc);
if (r)
return r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Channel duration, in seconds",
.key = "duration",
.regex = "\\.[0-9]+",
.preferred = TIL_SETTINGS_STR(RTV_DURATION_SECS),
.annotations = NULL
},
&duration,
res_setting,
res_desc);
if (r)
return r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Context duration, in seconds",
.key = "context_duration",
.regex = "\\.[0-9]+",
.preferred = TIL_SETTINGS_STR(RTV_CONTEXT_DURATION_SECS),
.annotations = NULL
},
&context_duration,
res_setting,
res_desc);
if (r)
return r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Caption duration, in seconds",
.key = "caption_duration",
.regex = "\\.[0-9]+",
.preferred = TIL_SETTINGS_STR(RTV_CAPTION_DURATION_SECS),
.annotations = NULL
},
&caption_duration,
res_setting,
res_desc);
if (r)
return r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Snow on channel-switch duration, in seconds",
.key = "snow_duration",
.regex = "\\.[0-9]+",
.preferred = TIL_SETTINGS_STR(RTV_SNOW_DURATION_SECS),
.annotations = NULL
},
&snow_duration,
res_setting,
res_desc);
if (r)
return r;
r = til_settings_get_and_describe_value(settings,
&(til_setting_desc_t){
.name = "Module to use for snow (\"none\" for blank)",
.key = "snow_module",
.preferred = "snow",
.annotations = NULL
},
&snow_module,
res_setting,
res_desc);
if (r)
return r;
if (res_setup) {
rtv_setup_t *setup;
/* FIXME: rtv_setup_t.snow_module needs freeing, so we need a bespoke free_func */
setup = til_setup_new(sizeof(*setup) + sizeof(setup->channels[0]), (void(*)(til_setup_t *))free);
if (!setup)
return -ENOMEM;
/* turn channels colon-separated list into a null-terminated array of strings */
if (strcmp(channels, "all")) {
const til_module_t **modules;
size_t n_modules;
char *tokchannels, *channel;
int n = 2;
til_get_modules(&modules, &n_modules);
tokchannels = strdup(channels);
if (!tokchannels) {
til_setup_free(&setup->til_setup);
return -ENOMEM;
}
channel = strtok(tokchannels, ":");
do {
rtv_setup_t *new;
size_t i;
for (i = 0; i < n_modules; i++) {
if (!strcmp(channel, modules[i]->name))
break;
}
if (i >= n_modules) {
til_setup_free(&setup->til_setup);
return -EINVAL;
}
new = realloc(setup, sizeof(*setup) + n * sizeof(setup->channels[0]));
if (!new) {
til_setup_free(&setup->til_setup);
return -ENOMEM;
}
new->channels[n - 2] = channel;
new->channels[n - 1] = NULL;
n++;
setup = new;
} while (channel = strtok(NULL, ":"));
}
if (strcmp(snow_module, "none"))
setup->snow_module = strdup(snow_module);
/* TODO FIXME: parse errors */
sscanf(duration, "%u", &setup->duration);
sscanf(context_duration, "%u", &setup->context_duration);
sscanf(caption_duration, "%u", &setup->caption_duration);
sscanf(snow_duration, "%u", &setup->snow_duration);
*res_setup = &setup->til_setup;
}
return 0;
}
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