/*
  * Copyright (c) 2008 Vitor Sessak
  *
  * 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
  * memory buffer source filter
  */
 

 #include "avfilter.h"

 #include "internal.h"

 #include "avcodec.h"

 #include "buffersrc.h"

 #include "vsrc_buffer.h"

 #include "libavutil/imgutils.h"

 
 typedef struct {

     AVFilterBufferRef *picref;

     int               h, w;
     enum PixelFormat  pix_fmt;

     AVRational        time_base;     ///< time_base to set in the output link

     AVRational        sample_aspect_ratio;

     char              sws_param[256];

 } BufferSourceContext;
 

 #define CHECK_PARAM_CHANGE(s, c, width, height, format)\
     if (c->w != width || c->h != height || c->pix_fmt != format) {\
         av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
         return AVERROR(EINVAL);\
     }
 

 int av_vsrc_buffer_add_video_buffer_ref(AVFilterContext *buffer_filter,
                                         AVFilterBufferRef *picref, int flags)

 {
     BufferSourceContext *c = buffer_filter->priv;

     AVFilterLink *outlink = buffer_filter->outputs[0];

     int ret;

     if (c->picref) {

         if (flags & AV_VSRC_BUF_FLAG_OVERWRITE) {
             avfilter_unref_buffer(c->picref);
             c->picref = NULL;
         } else {
             av_log(buffer_filter, AV_LOG_ERROR,
                    "Buffering several frames is not supported. "
                    "Please consume all available frames before adding a new one.\n");
             return AVERROR(EINVAL);
         }

     }
 

     if (picref->video->w != c->w || picref->video->h != c->h || picref->format != c->pix_fmt) {

         AVFilterContext *scale = buffer_filter->outputs[0]->dst;

         AVFilterLink *link;

         char scale_param[1024];

         av_log(buffer_filter, AV_LOG_INFO,
                "Buffer video input changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
                c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,

                picref->video->w, picref->video->h, av_pix_fmt_descriptors[picref->format].name);

         if (!scale || strcmp(scale->filter->name, "scale")) {
             AVFilter *f = avfilter_get_by_name("scale");

 
             av_log(buffer_filter, AV_LOG_INFO, "Inserting scaler filter\n");

             if ((ret = avfilter_open(&scale, f, "Input equalizer")) < 0)
                 return ret;

             snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s", c->w, c->h, c->sws_param);
             if ((ret = avfilter_init_filter(scale, scale_param, NULL)) < 0) {

                 avfilter_free(scale);
                 return ret;
             }
 

             if ((ret = avfilter_insert_filter(buffer_filter->outputs[0], scale, 0, 0)) < 0) {

                 avfilter_free(scale);
                 return ret;
             }

             scale->outputs[0]->time_base = scale->inputs[0]->time_base;

 
             scale->outputs[0]->format= c->pix_fmt;

         } else if (!strcmp(scale->filter->name, "scale")) {

             snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s",
                      scale->outputs[0]->w, scale->outputs[0]->h, c->sws_param);
             scale->filter->init(scale, scale_param, NULL);

         }
 

         c->pix_fmt = scale->inputs[0]->format = picref->format;
         c->w       = scale->inputs[0]->w      = picref->video->w;
         c->h       = scale->inputs[0]->h      = picref->video->h;

         link = scale->outputs[0];

         if ((ret =  link->srcpad->config_props(link)) < 0)
             return ret;
     }
 

     c->picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
                                           picref->video->w, picref->video->h);
     av_image_copy(c->picref->data, c->picref->linesize,

                   (void*)picref->data, picref->linesize,

                   picref->format, picref->video->w, picref->video->h);
     avfilter_copy_buffer_ref_props(c->picref, picref);

 
     return 0;
 }
 

 int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
 {
     BufferSourceContext *c = s->priv;
 

     if (c->picref) {

         av_log(s, AV_LOG_ERROR,
                "Buffering several frames is not supported. "
                "Please consume all available frames before adding a new one.\n"
             );
         return AVERROR(EINVAL);
     }
 

 //     CHECK_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);

     c->picref = buf;

 
     return 0;
 }
 

 #if CONFIG_AVCODEC
 #include "avcodec.h"
 

 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_src,
                              const AVFrame *frame, int flags)

 {

     int ret;

     AVFilterBufferRef *picref =
         avfilter_get_video_buffer_ref_from_frame(frame, AV_PERM_WRITE);
     if (!picref)
         return AVERROR(ENOMEM);

     ret = av_vsrc_buffer_add_video_buffer_ref(buffer_src, picref, flags);

     picref->buf->data[0] = NULL;
     avfilter_unref_buffer(picref);
 

     return ret;

 }
 #endif
 

 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 {
     BufferSourceContext *c = ctx->priv;

     char pix_fmt_str[128];

     int ret, n = 0;

     *c->sws_param = 0;

     if (!args ||

         (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,

                     &c->time_base.num, &c->time_base.den,

                     &c->sample_aspect_ratio.num, &c->sample_aspect_ratio.den, c->sws_param)) < 7) {
         av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);

         return AVERROR(EINVAL);
     }

     if ((ret = ff_parse_pixel_format(&c->pix_fmt, pix_fmt_str, ctx)) < 0)
         return ret;

     av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s tb:%d/%d sar:%d/%d sws_param:%s\n",

            c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
            c->time_base.num, c->time_base.den,

            c->sample_aspect_ratio.num, c->sample_aspect_ratio.den, c->sws_param);

     return 0;

 }
 

 static av_cold void uninit(AVFilterContext *ctx)
 {
     BufferSourceContext *s = ctx->priv;

     if (s->picref)
         avfilter_unref_buffer(s->picref);
     s->picref = NULL;

 }
 

 static int query_formats(AVFilterContext *ctx)
 {
     BufferSourceContext *c = ctx->priv;
     enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
 

     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));

     return 0;
 }
 
 static int config_props(AVFilterLink *link)
 {
     BufferSourceContext *c = link->src->priv;
 
     link->w = c->w;
     link->h = c->h;

     link->sample_aspect_ratio = c->sample_aspect_ratio;

     link->time_base = c->time_base;

 
     return 0;
 }
 
 static int request_frame(AVFilterLink *link)
 {
     BufferSourceContext *c = link->src->priv;
 

     if (!c->picref) {

         av_log(link->src, AV_LOG_WARNING,

                "request_frame() called with no available frame!\n");

         return AVERROR(EINVAL);

     }
 

     avfilter_start_frame(link, avfilter_ref_buffer(c->picref, ~0));

     avfilter_draw_slice(link, 0, link->h, 1);
     avfilter_end_frame(link);

     avfilter_unref_buffer(c->picref);
     c->picref = NULL;

 
     return 0;
 }
 
 static int poll_frame(AVFilterLink *link)
 {
     BufferSourceContext *c = link->src->priv;

     return !!c->picref;

 }
 

 AVFilter avfilter_vsrc_buffer = {

     .name      = "buffer",

     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),

     .priv_size = sizeof(BufferSourceContext),
     .query_formats = query_formats,
 
     .init      = init,

     .uninit    = uninit,

     .inputs    = (const AVFilterPad[]) {{ .name = NULL }},
     .outputs   = (const AVFilterPad[]) {{ .name      = "default",

                                     .type            = AVMEDIA_TYPE_VIDEO,
                                     .request_frame   = request_frame,
                                     .poll_frame      = poll_frame,
                                     .config_props    = config_props, },
                                   { .name = NULL}},
 };