/*

  * Copyright (c) 2010 Stefano Sabatini

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * frei0r wrapper
  */
 
 /* #define DEBUG */
 
 #include <dlfcn.h>
 #include <frei0r.h>

 #include "libavutil/avstring.h"

 #include "libavutil/imgutils.h"
 #include "libavutil/parseutils.h"

 #include "avfilter.h"
 
 typedef f0r_instance_t (*f0r_construct_f)(unsigned int width, unsigned int height);
 typedef void (*f0r_destruct_f)(f0r_instance_t instance);
 typedef void (*f0r_deinit_f)(void);
 typedef int (*f0r_init_f)(void);
 typedef void (*f0r_get_plugin_info_f)(f0r_plugin_info_t *info);
 typedef void (*f0r_get_param_info_f)(f0r_param_info_t *info, int param_index);
 typedef void (*f0r_update_f)(f0r_instance_t instance, double time, const uint32_t *inframe, uint32_t *outframe);
 typedef void (*f0r_update2_f)(f0r_instance_t instance, double time, const uint32_t *inframe1, const uint32_t *inframe2, const uint32_t *inframe3, uint32_t *outframe);
 typedef void (*f0r_set_param_value_f)(f0r_instance_t instance, f0r_param_t param, int param_index);
 typedef void (*f0r_get_param_value_f)(f0r_instance_t instance, f0r_param_t param, int param_index);
 
 typedef struct Frei0rContext {
     f0r_update_f update;
     void *dl_handle;            /* dynamic library handle   */
     f0r_instance_t instance;
     f0r_plugin_info_t plugin_info;
 
     f0r_get_param_info_f  get_param_info;
     f0r_get_param_value_f get_param_value;
     f0r_set_param_value_f set_param_value;
     f0r_construct_f       construct;
     f0r_destruct_f        destruct;
     f0r_deinit_f          deinit;
     char params[256];

 
     /* only used by the source */
     int w, h;
     AVRational time_base;
     uint64_t pts;

 } Frei0rContext;
 
 static void *load_sym(AVFilterContext *ctx, const char *sym_name)
 {
     Frei0rContext *frei0r = ctx->priv;
     void *sym = dlsym(frei0r->dl_handle, sym_name);
     if (!sym)
         av_log(ctx, AV_LOG_ERROR, "Could not find symbol '%s' in loaded module\n", sym_name);
     return sym;
 }
 
 static int set_param(AVFilterContext *ctx, f0r_param_info_t info, int index, char *param)
 {
     Frei0rContext *frei0r = ctx->priv;
     union {
         double d;
         f0r_param_color_t col;
         f0r_param_position_t pos;
     } val;
     char *tail;
     uint8_t rgba[4];
 
     switch (info.type) {
     case F0R_PARAM_BOOL:
         if      (!strcmp(param, "y")) val.d = 1.0;
         else if (!strcmp(param, "n")) val.d = 0.0;
         else goto fail;
         break;
 
     case F0R_PARAM_DOUBLE:
         val.d = strtod(param, &tail);
         if (*tail || val.d == HUGE_VAL)
             goto fail;
         break;
 
     case F0R_PARAM_COLOR:
         if (sscanf(param, "%f/%f/%f", &val.col.r, &val.col.g, &val.col.b) != 3) {

             if (av_parse_color(rgba, param, -1, ctx) < 0)

                 goto fail;
             val.col.r = rgba[0] / 255.0;
             val.col.g = rgba[1] / 255.0;
             val.col.b = rgba[2] / 255.0;
         }
         break;
 
     case F0R_PARAM_POSITION:
         if (sscanf(param, "%lf/%lf", &val.pos.x, &val.pos.y) != 2)
             goto fail;
         break;
     }
 
     frei0r->set_param_value(frei0r->instance, &val, index);
     return 0;
 
 fail:
     av_log(ctx, AV_LOG_ERROR, "Invalid value '%s' for parameter '%s'\n",
            param, info.name);
     return AVERROR(EINVAL);
 }
 
 static int set_params(AVFilterContext *ctx, const char *params)
 {
     Frei0rContext *frei0r = ctx->priv;
     int i;
 
     for (i = 0; i < frei0r->plugin_info.num_params; i++) {
         f0r_param_info_t info;
         char *param;
         int ret;
 
         frei0r->get_param_info(&info, i);
 
         if (*params) {
             if (!(param = av_get_token(&params, ":")))
                 return AVERROR(ENOMEM);
             params++;               /* skip ':' */
             ret = set_param(ctx, info, i, param);
             av_free(param);
             if (ret < 0)
                 return ret;
         }
 
         av_log(ctx, AV_LOG_INFO,
                "idx:%d name:'%s' type:%s explanation:'%s' ",
                i, info.name,
                info.type == F0R_PARAM_BOOL     ? "bool"     :
                info.type == F0R_PARAM_DOUBLE   ? "double"   :
                info.type == F0R_PARAM_COLOR    ? "color"    :
                info.type == F0R_PARAM_POSITION ? "position" :
                info.type == F0R_PARAM_STRING   ? "string"   : "unknown",
                info.explanation);
 
 #ifdef DEBUG
         av_log(ctx, AV_LOG_INFO, "value:");
         switch (info.type) {
             void *v;
             double d;
             char s[128];
             f0r_param_color_t col;
             f0r_param_position_t pos;
 
         case F0R_PARAM_BOOL:
             v = &d;
             frei0r->get_param_value(frei0r->instance, v, i);
             av_log(ctx, AV_LOG_INFO, "%s", d >= 0.5 && d <= 1.0 ? "y" : "n");
             break;
         case F0R_PARAM_DOUBLE:
             v = &d;
             frei0r->get_param_value(frei0r->instance, v, i);
             av_log(ctx, AV_LOG_INFO, "%f", d);
             break;
         case F0R_PARAM_COLOR:
             v = &col;
             frei0r->get_param_value(frei0r->instance, v, i);
             av_log(ctx, AV_LOG_INFO, "%f/%f/%f", col.r, col.g, col.b);
             break;
         case F0R_PARAM_POSITION:
             v = &pos;
             frei0r->get_param_value(frei0r->instance, v, i);
             av_log(ctx, AV_LOG_INFO, "%lf/%lf", pos.x, pos.y);
             break;
         default: /* F0R_PARAM_STRING */
             v = s;
             frei0r->get_param_value(frei0r->instance, v, i);
             av_log(ctx, AV_LOG_INFO, "'%s'\n", s);
             break;
         }
 #endif
         av_log(ctx, AV_LOG_INFO, "\n");
     }
 
     return 0;
 }
 
 static void *load_path(AVFilterContext *ctx, const char *prefix, const char *name)
 {
     char path[1024];
 

     snprintf(path, sizeof(path), "%s%s%s", prefix, name, SLIBSUF);

     av_log(ctx, AV_LOG_DEBUG, "Looking for frei0r effect in '%s'\n", path);
     return dlopen(path, RTLD_NOW|RTLD_LOCAL);
 }
 

 static av_cold int frei0r_init(AVFilterContext *ctx,
                                const char *dl_name, int type)

 {
     Frei0rContext *frei0r = ctx->priv;
     f0r_init_f            f0r_init;
     f0r_get_plugin_info_f f0r_get_plugin_info;
     f0r_plugin_info_t *pi;

     char *path;

 
     /* see: http://piksel.org/frei0r/1.2/spec/1.2/spec/group__pluglocations.html */
     if ((path = av_strdup(getenv("FREI0R_PATH")))) {
         char *p, *ptr = NULL;
         for (p = path; p = strtok_r(p, ":", &ptr); p = NULL)
             if (frei0r->dl_handle = load_path(ctx, p, dl_name))
                 break;
         av_free(path);
     }

     if (!frei0r->dl_handle && (path = getenv("HOME"))) {

         char prefix[1024];
         snprintf(prefix, sizeof(prefix), "%s/.frei0r-1/lib/", path);
         frei0r->dl_handle = load_path(ctx, prefix, dl_name);
     }
     if (!frei0r->dl_handle)
         frei0r->dl_handle = load_path(ctx, "/usr/local/lib/frei0r-1/", dl_name);
     if (!frei0r->dl_handle)
         frei0r->dl_handle = load_path(ctx, "/usr/lib/frei0r-1/", dl_name);
     if (!frei0r->dl_handle) {
         av_log(ctx, AV_LOG_ERROR, "Could not find module '%s'\n", dl_name);
         return AVERROR(EINVAL);
     }
 
     if (!(f0r_init                = load_sym(ctx, "f0r_init"           )) ||
         !(f0r_get_plugin_info     = load_sym(ctx, "f0r_get_plugin_info")) ||
         !(frei0r->get_param_info  = load_sym(ctx, "f0r_get_param_info" )) ||
         !(frei0r->get_param_value = load_sym(ctx, "f0r_get_param_value")) ||
         !(frei0r->set_param_value = load_sym(ctx, "f0r_set_param_value")) ||
         !(frei0r->update          = load_sym(ctx, "f0r_update"         )) ||
         !(frei0r->construct       = load_sym(ctx, "f0r_construct"      )) ||
         !(frei0r->destruct        = load_sym(ctx, "f0r_destruct"       )) ||
         !(frei0r->deinit          = load_sym(ctx, "f0r_deinit"         )))
         return AVERROR(EINVAL);
 
     if (f0r_init() < 0) {
         av_log(ctx, AV_LOG_ERROR, "Could not init the frei0r module");
         return AVERROR(EINVAL);
     }
 
     f0r_get_plugin_info(&frei0r->plugin_info);
     pi = &frei0r->plugin_info;

     if (pi->plugin_type != type) {

         av_log(ctx, AV_LOG_ERROR,

                "Invalid type '%s' for the plugin\n",
                pi->plugin_type == F0R_PLUGIN_TYPE_FILTER ? "filter" :

                pi->plugin_type == F0R_PLUGIN_TYPE_SOURCE ? "source" :
                pi->plugin_type == F0R_PLUGIN_TYPE_MIXER2 ? "mixer2" :
                pi->plugin_type == F0R_PLUGIN_TYPE_MIXER3 ? "mixer3" : "unknown");
         return AVERROR(EINVAL);
     }
 
     av_log(ctx, AV_LOG_INFO,
            "name:%s author:'%s' explanation:'%s' color_model:%s "
            "frei0r_version:%d version:%d.%d num_params:%d\n",
            pi->name, pi->author, pi->explanation,
            pi->color_model == F0R_COLOR_MODEL_BGRA8888 ? "bgra8888" :
            pi->color_model == F0R_COLOR_MODEL_RGBA8888 ? "rgba8888" :
            pi->color_model == F0R_COLOR_MODEL_PACKED32 ? "packed32" : "unknown",
            pi->frei0r_version, pi->major_version, pi->minor_version, pi->num_params);
 
     return 0;
 }
 

 static av_cold int filter_init(AVFilterContext *ctx, const char *args, void *opaque)
 {
     Frei0rContext *frei0r = ctx->priv;

     char dl_name[1024], c;

     *frei0r->params = 0;
 
     if (args)

         sscanf(args, "%1023[^:=]%c%255c", dl_name, &c, frei0r->params);

 
     return frei0r_init(ctx, dl_name, F0R_PLUGIN_TYPE_FILTER);
 }
 

 static av_cold void uninit(AVFilterContext *ctx)
 {
     Frei0rContext *frei0r = ctx->priv;
 

     if (frei0r->destruct && frei0r->instance)

         frei0r->destruct(frei0r->instance);
     if (frei0r->deinit)
         frei0r->deinit();
     if (frei0r->dl_handle)
         dlclose(frei0r->dl_handle);
 
     memset(frei0r, 0, sizeof(*frei0r));
 }
 
 static int config_input_props(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     Frei0rContext *frei0r = ctx->priv;
 
     if (!(frei0r->instance = frei0r->construct(inlink->w, inlink->h))) {
         av_log(ctx, AV_LOG_ERROR, "Impossible to load frei0r instance");
         return AVERROR(EINVAL);
     }
 
     return set_params(ctx, frei0r->params);
 }
 
 static int query_formats(AVFilterContext *ctx)
 {
     Frei0rContext *frei0r = ctx->priv;
     AVFilterFormats *formats = NULL;
 
     if        (frei0r->plugin_info.color_model == F0R_COLOR_MODEL_BGRA8888) {
         avfilter_add_format(&formats, PIX_FMT_BGRA);
     } else if (frei0r->plugin_info.color_model == F0R_COLOR_MODEL_RGBA8888) {
         avfilter_add_format(&formats, PIX_FMT_RGBA);
     } else {                                   /* F0R_COLOR_MODEL_PACKED32 */
         static const enum PixelFormat pix_fmts[] = {
             PIX_FMT_BGRA, PIX_FMT_ARGB, PIX_FMT_ABGR, PIX_FMT_ARGB, PIX_FMT_NONE
         };
         formats = avfilter_make_format_list(pix_fmts);
     }
 
     if (!formats)
         return AVERROR(ENOMEM);
 

     avfilter_set_common_pixel_formats(ctx, formats);

     return 0;
 }
 
 static void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
 
 static void end_frame(AVFilterLink *inlink)
 {
     Frei0rContext *frei0r = inlink->dst->priv;
     AVFilterLink *outlink = inlink->dst->outputs[0];
     AVFilterBufferRef  *inpicref =  inlink->cur_buf;
     AVFilterBufferRef *outpicref = outlink->out_buf;
 

     frei0r->update(frei0r->instance, inpicref->pts * av_q2d(inlink->time_base) * 1000,

                    (const uint32_t *)inpicref->data[0],
                    (uint32_t *)outpicref->data[0]);
     avfilter_unref_buffer(inpicref);
     avfilter_draw_slice(outlink, 0, outlink->h, 1);
     avfilter_end_frame(outlink);
     avfilter_unref_buffer(outpicref);
 }
 
 AVFilter avfilter_vf_frei0r = {
     .name      = "frei0r",
     .description = NULL_IF_CONFIG_SMALL("Apply a frei0r effect."),
 
     .query_formats = query_formats,

     .init = filter_init,

     .uninit = uninit,
 
     .priv_size = sizeof(Frei0rContext),
 
     .inputs    = (AVFilterPad[]) {{ .name             = "default",
                                     .type             = AVMEDIA_TYPE_VIDEO,
                                     .draw_slice       = null_draw_slice,
                                     .config_props     = config_input_props,
                                     .end_frame        = end_frame,
                                     .min_perms        = AV_PERM_READ },
                                   { .name = NULL}},
 
     .outputs   = (AVFilterPad[]) {{ .name             = "default",
                                     .type             = AVMEDIA_TYPE_VIDEO, },
                                   { .name = NULL}},
 };

 
 static av_cold int source_init(AVFilterContext *ctx, const char *args, void *opaque)
 {
     Frei0rContext *frei0r = ctx->priv;
     char dl_name[1024], c;
     char frame_size[128] = "";
     char frame_rate[128] = "";
     AVRational frame_rate_q;
 
     memset(frei0r->params, 0, sizeof(frei0r->params));
 
     if (args)
         sscanf(args, "%127[^:]:%127[^:]:%1023[^:=]%c%255c",
                frame_size, frame_rate, dl_name, &c, frei0r->params);
 
     if (av_parse_video_size(&frei0r->w, &frei0r->h, frame_size) < 0) {
         av_log(ctx, AV_LOG_ERROR, "Invalid frame size: '%s'\n", frame_size);
         return AVERROR(EINVAL);
     }
 
     if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||
         frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
         av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: '%s'\n", frame_rate);
         return AVERROR(EINVAL);
     }
     frei0r->time_base.num = frame_rate_q.den;
     frei0r->time_base.den = frame_rate_q.num;
 
     return frei0r_init(ctx, dl_name, F0R_PLUGIN_TYPE_SOURCE);
 }
 
 static int source_config_props(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
     Frei0rContext *frei0r = ctx->priv;
 
     if (av_image_check_size(frei0r->w, frei0r->h, 0, ctx) < 0)
         return AVERROR(EINVAL);
     outlink->w = frei0r->w;
     outlink->h = frei0r->h;
     outlink->time_base = frei0r->time_base;
 
     if (!(frei0r->instance = frei0r->construct(outlink->w, outlink->h))) {
         av_log(ctx, AV_LOG_ERROR, "Impossible to load frei0r instance");
         return AVERROR(EINVAL);
     }
 
     return set_params(ctx, frei0r->params);
 }
 
 static int source_request_frame(AVFilterLink *outlink)
 {
     Frei0rContext *frei0r = outlink->src->priv;
     AVFilterBufferRef *picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);

     picref->video->sample_aspect_ratio = (AVRational) {1, 1};

     picref->pts = frei0r->pts++;
     picref->pos = -1;
 
     avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
     frei0r->update(frei0r->instance, av_rescale_q(picref->pts, frei0r->time_base, (AVRational){1,1000}),
                    NULL, (uint32_t *)picref->data[0]);
     avfilter_draw_slice(outlink, 0, outlink->h, 1);
     avfilter_end_frame(outlink);
     avfilter_unref_buffer(picref);
 
     return 0;
 }
 
 AVFilter avfilter_vsrc_frei0r_src = {
     .name        = "frei0r_src",
     .description = NULL_IF_CONFIG_SMALL("Generate a frei0r source."),
 
     .priv_size = sizeof(Frei0rContext),
     .init      = source_init,
     .uninit    = uninit,
 
     .query_formats = query_formats,
 
     .inputs    = (AVFilterPad[]) {{ .name = NULL}},
 
     .outputs   = (AVFilterPad[]) {{ .name            = "default",
                                     .type            = AVMEDIA_TYPE_VIDEO,
                                     .request_frame   = source_request_frame,
                                     .config_props    = source_config_props },
                                   { .name = NULL}},
 };