git.sesse.net Git - ffmpeg/blob - libavfilter/vsrc_buffer.c

   1 /*
   2  * Copyright (c) 2008 Vitor Sessak
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * memory buffer source filter
  24  */
  25
  26 #include "avfilter.h"
  27 #include "vsrc_buffer.h"
  28 #include "libavutil/imgutils.h"
  29
  30 typedef struct {
  31     int64_t           pts;
  32     AVFrame           frame;
  33     int               has_frame;
  34     int               h, w;
  35     enum PixelFormat  pix_fmt;
  36     AVRational        time_base;     ///< time_base to set in the output link
  37     AVRational        sample_aspect_ratio;
  38     char              sws_param[256];
  39 } BufferSourceContext;
  40
  41 int av_vsrc_buffer_add_frame2(AVFilterContext *buffer_filter, AVFrame *frame,
  42                               int64_t pts, int width,
  43                               int height, enum PixelFormat  pix_fmt,
  44                               const char *sws_param)
  45 {
  46     BufferSourceContext *c = buffer_filter->priv;
  47     int ret;
  48
  49     if (c->has_frame) {
  50         av_log(buffer_filter, AV_LOG_ERROR,
  51                "Buffering several frames is not supported. "
  52                "Please consume all available frames before adding a new one.\n"
  53             );
  54         //return -1;
  55     }
  56
  57     if(!c->sws_param[0]){
  58         snprintf(c->sws_param, 255, "%d:%d:%s", c->w, c->h, sws_param);
  59     }
  60
  61     if(width != c->w || height != c->h || pix_fmt != c->pix_fmt){
  62         AVFilterContext *scale= buffer_filter->outputs[0]->dst;
  63         AVFilterLink *link;
  64
  65         av_log(buffer_filter, AV_LOG_INFO,
  66                "Buffer video input changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
  67                c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
  68                width, height, av_pix_fmt_descriptors[pix_fmt].name);
  69
  70         if(!scale || strcmp(scale->filter->name,"scale")){
  71             AVFilter *f= avfilter_get_by_name("scale");
  72
  73             av_log(buffer_filter, AV_LOG_INFO, "Inserting scaler filter\n");
  74             if(avfilter_open(&scale, f, "Input equalizer") < 0)
  75                 return -1;
  76
  77             if((ret=avfilter_init_filter(scale, c->sws_param, NULL))<0){
  78                 avfilter_free(scale);
  79                 return ret;
  80             }
  81
  82             if((ret=avfilter_insert_filter(buffer_filter->outputs[0], scale, 0, 0))<0){
  83                 avfilter_free(scale);
  84                 return ret;
  85             }
  86             scale->outputs[0]->time_base = scale->inputs[0]->time_base;
  87
  88             scale->outputs[0]->format= c->pix_fmt;
  89         } else if(!strcmp(scale->filter->name, "scale")) {
  90             snprintf(c->sws_param, 255, "%d:%d:%s", scale->outputs[0]->w, scale->outputs[0]->h, sws_param);
  91             scale->filter->init(scale, c->sws_param, NULL);
  92         }
  93
  94         c->pix_fmt= scale->inputs[0]->format= pix_fmt;
  95         c->w= scale->inputs[0]->w= width;
  96         c->h= scale->inputs[0]->h= height;
  97
  98         link= scale->outputs[0];
  99         if ((ret =  link->srcpad->config_props(link)) < 0)
 100             return ret;
 101     }
 102
 103     memcpy(c->frame.data    , frame->data    , sizeof(frame->data));
 104     memcpy(c->frame.linesize, frame->linesize, sizeof(frame->linesize));
 105     c->frame.width  = frame->width;
 106     c->frame.height = frame->height;
 107     c->frame.format = frame->format;
 108     c->frame.interlaced_frame= frame->interlaced_frame;
 109     c->frame.top_field_first = frame->top_field_first;
 110     c->frame.key_frame = frame->key_frame;
 111     c->frame.pict_type = frame->pict_type;
 112     c->frame.sample_aspect_ratio = frame->sample_aspect_ratio;
 113     c->pts = pts;
 114     c->has_frame = 1;
 115
 116     return 0;
 117 }
 118
 119 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
 120                              int64_t pts)
 121 {
 122     BufferSourceContext *c = buffer_filter->priv;
 123
 124     return av_vsrc_buffer_add_frame2(buffer_filter, frame,
 125                               pts, c->w,
 126                               c->h, c->pix_fmt, "");
 127 }
 128
 129 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 130 {
 131     BufferSourceContext *c = ctx->priv;
 132     char pix_fmt_str[128];
 133     int n = 0;
 134
 135     if (!args ||
 136         (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
 137                     &c->time_base.num, &c->time_base.den,
 138                     &c->sample_aspect_ratio.num, &c->sample_aspect_ratio.den)) != 7) {
 139         av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but only %d found in '%s'\n", n, args);
 140         return AVERROR(EINVAL);
 141     }
 142     if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
 143         char *tail;
 144         c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
 145         if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
 146             av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
 147             return AVERROR(EINVAL);
 148         }
 149     }
 150
 151     av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s\n", c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name);
 152     return 0;
 153 }
 154
 155 static int query_formats(AVFilterContext *ctx)
 156 {
 157     BufferSourceContext *c = ctx->priv;
 158     enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
 159
 160     avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
 161     return 0;
 162 }
 163
 164 static int config_props(AVFilterLink *link)
 165 {
 166     BufferSourceContext *c = link->src->priv;
 167
 168     link->w = c->w;
 169     link->h = c->h;
 170     link->sample_aspect_ratio = c->sample_aspect_ratio;
 171     link->time_base = c->time_base;
 172
 173     return 0;
 174 }
 175
 176 static int request_frame(AVFilterLink *link)
 177 {
 178     BufferSourceContext *c = link->src->priv;
 179     AVFilterBufferRef *picref;
 180
 181     if (!c->has_frame) {
 182         av_log(link->src, AV_LOG_ERROR,
 183                "request_frame() called with no available frame!\n");
 184         //return -1;
 185     }
 186
 187     /* This picture will be needed unmodified later for decoding the next
 188      * frame */
 189     picref = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
 190                                        AV_PERM_REUSE2,
 191                                        link->w, link->h);
 192
 193     av_image_copy(picref->data, picref->linesize,
 194                   c->frame.data, c->frame.linesize,
 195                   picref->format, link->w, link->h);
 196
 197     picref->pts                    = c->pts;
 198     picref->video->sample_aspect_ratio = c->frame.sample_aspect_ratio;
 199     picref->video->interlaced      = c->frame.interlaced_frame;
 200     picref->video->top_field_first = c->frame.top_field_first;
 201     picref->video->key_frame       = c->frame.key_frame;
 202     picref->video->pict_type       = c->frame.pict_type;
 203     avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
 204     avfilter_draw_slice(link, 0, link->h, 1);
 205     avfilter_end_frame(link);
 206     avfilter_unref_buffer(picref);
 207
 208     c->has_frame = 0;
 209
 210     return 0;
 211 }
 212
 213 static int poll_frame(AVFilterLink *link)
 214 {
 215     BufferSourceContext *c = link->src->priv;
 216     return !!(c->has_frame);
 217 }
 218
 219 AVFilter avfilter_vsrc_buffer = {
 220     .name      = "buffer",
 221     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
 222     .priv_size = sizeof(BufferSourceContext),
 223     .query_formats = query_formats,
 224
 225     .init      = init,
 226
 227     .inputs    = (AVFilterPad[]) {{ .name = NULL }},
 228     .outputs   = (AVFilterPad[]) {{ .name            = "default",
 229                                     .type            = AVMEDIA_TYPE_VIDEO,
 230                                     .request_frame   = request_frame,
 231                                     .poll_frame      = poll_frame,
 232                                     .config_props    = config_props, },
 233                                   { .name = NULL}},
 234 };