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 "avcodec.h"
  28 #include "vsrc_buffer.h"
  29 #include "libavutil/imgutils.h"
  30
  31 typedef struct {
  32     int64_t           pts;
  33     AVFrame           frame;
  34     int               has_frame;
  35     int               h, w;
  36     enum PixelFormat  pix_fmt;
  37     AVRational        time_base;     ///< time_base to set in the output link
  38     AVRational        sample_aspect_ratio;
  39     char              sws_param[256];
  40 } BufferSourceContext;
  41
  42 int av_vsrc_buffer_add_frame2(AVFilterContext *buffer_filter, AVFrame *frame,
  43                               int64_t pts, int width,
  44                               int height, enum PixelFormat  pix_fmt,
  45                               const char *sws_param)
  46 {
  47     BufferSourceContext *c = buffer_filter->priv;
  48     int ret;
  49
  50     if (c->has_frame) {
  51         av_log(buffer_filter, AV_LOG_ERROR,
  52                "Buffering several frames is not supported. "
  53                "Please consume all available frames before adding a new one.\n"
  54             );
  55         //return -1;
  56     }
  57
  58     if(!c->sws_param[0]){
  59         snprintf(c->sws_param, 255, "%d:%d:%s", c->w, c->h, sws_param);
  60     }
  61
  62     if(width != c->w || height != c->h || pix_fmt != c->pix_fmt){
  63         AVFilterContext *scale= buffer_filter->outputs[0]->dst;
  64         AVFilterLink *link;
  65
  66         av_log(buffer_filter, AV_LOG_INFO,
  67                "Buffer video input changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
  68                c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
  69                width, height, av_pix_fmt_descriptors[pix_fmt].name);
  70
  71         if(!scale || strcmp(scale->filter->name,"scale")){
  72             AVFilter *f= avfilter_get_by_name("scale");
  73
  74             av_log(buffer_filter, AV_LOG_INFO, "Inserting scaler filter\n");
  75             if(avfilter_open(&scale, f, "Input equalizer") < 0)
  76                 return -1;
  77
  78             if((ret=avfilter_init_filter(scale, c->sws_param, NULL))<0){
  79                 avfilter_free(scale);
  80                 return ret;
  81             }
  82
  83             if((ret=avfilter_insert_filter(buffer_filter->outputs[0], scale, 0, 0))<0){
  84                 avfilter_free(scale);
  85                 return ret;
  86             }
  87             scale->outputs[0]->time_base = scale->inputs[0]->time_base;
  88
  89             scale->outputs[0]->format= c->pix_fmt;
  90         } else if(!strcmp(scale->filter->name, "scale")) {
  91             snprintf(c->sws_param, 255, "%d:%d:%s", scale->outputs[0]->w, scale->outputs[0]->h, sws_param);
  92             scale->filter->init(scale, c->sws_param, NULL);
  93         }
  94
  95         c->pix_fmt= scale->inputs[0]->format= pix_fmt;
  96         c->w= scale->inputs[0]->w= width;
  97         c->h= scale->inputs[0]->h= height;
  98
  99         link= scale->outputs[0];
 100         if ((ret =  link->srcpad->config_props(link)) < 0)
 101             return ret;
 102     }
 103
 104     memcpy(c->frame.data    , frame->data    , sizeof(frame->data));
 105     memcpy(c->frame.linesize, frame->linesize, sizeof(frame->linesize));
 106     c->frame.width  = frame->width;
 107     c->frame.height = frame->height;
 108     c->frame.format = frame->format;
 109     c->frame.interlaced_frame= frame->interlaced_frame;
 110     c->frame.top_field_first = frame->top_field_first;
 111     c->frame.key_frame = frame->key_frame;
 112     c->frame.pict_type = frame->pict_type;
 113     c->frame.sample_aspect_ratio = frame->sample_aspect_ratio;
 114     c->pts = pts;
 115     c->has_frame = 1;
 116
 117     return 0;
 118 }
 119
 120 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
 121                              int64_t pts)
 122 {
 123     BufferSourceContext *c = buffer_filter->priv;
 124
 125     return av_vsrc_buffer_add_frame2(buffer_filter, frame,
 126                               pts, c->w,
 127                               c->h, c->pix_fmt, "");
 128 }
 129
 130 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 131 {
 132     BufferSourceContext *c = ctx->priv;
 133     char pix_fmt_str[128];
 134     int n = 0;
 135
 136     if (!args ||
 137         (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
 138                     &c->time_base.num, &c->time_base.den,
 139                     &c->sample_aspect_ratio.num, &c->sample_aspect_ratio.den)) != 7) {
 140         av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but only %d found in '%s'\n", n, args);
 141         return AVERROR(EINVAL);
 142     }
 143     if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
 144         char *tail;
 145         c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
 146         if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
 147             av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
 148             return AVERROR(EINVAL);
 149         }
 150     }
 151
 152     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);
 153     return 0;
 154 }
 155
 156 static int query_formats(AVFilterContext *ctx)
 157 {
 158     BufferSourceContext *c = ctx->priv;
 159     enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
 160
 161     avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
 162     return 0;
 163 }
 164
 165 static int config_props(AVFilterLink *link)
 166 {
 167     BufferSourceContext *c = link->src->priv;
 168
 169     link->w = c->w;
 170     link->h = c->h;
 171     link->sample_aspect_ratio = c->sample_aspect_ratio;
 172     link->time_base = c->time_base;
 173
 174     return 0;
 175 }
 176
 177 static int request_frame(AVFilterLink *link)
 178 {
 179     BufferSourceContext *c = link->src->priv;
 180     AVFilterBufferRef *picref;
 181
 182     if (!c->has_frame) {
 183         av_log(link->src, AV_LOG_ERROR,
 184                "request_frame() called with no available frame!\n");
 185         //return -1;
 186     }
 187
 188     /* This picture will be needed unmodified later for decoding the next
 189      * frame */
 190     picref = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
 191                                        AV_PERM_REUSE2,
 192                                        link->w, link->h);
 193
 194     av_image_copy(picref->data, picref->linesize,
 195                   c->frame.data, c->frame.linesize,
 196                   picref->format, link->w, link->h);
 197     avfilter_copy_frame_props(picref, &c->frame);
 198     picref->pts = c->pts;
 199
 200     avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
 201     avfilter_draw_slice(link, 0, link->h, 1);
 202     avfilter_end_frame(link);
 203     avfilter_unref_buffer(picref);
 204
 205     c->has_frame = 0;
 206
 207     return 0;
 208 }
 209
 210 static int poll_frame(AVFilterLink *link)
 211 {
 212     BufferSourceContext *c = link->src->priv;
 213     return !!(c->has_frame);
 214 }
 215
 216 AVFilter avfilter_vsrc_buffer = {
 217     .name      = "buffer",
 218     .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
 219     .priv_size = sizeof(BufferSourceContext),
 220     .query_formats = query_formats,
 221
 222     .init      = init,
 223
 224     .inputs    = (AVFilterPad[]) {{ .name = NULL }},
 225     .outputs   = (AVFilterPad[]) {{ .name            = "default",
 226                                     .type            = AVMEDIA_TYPE_VIDEO,
 227                                     .request_frame   = request_frame,
 228                                     .poll_frame      = poll_frame,
 229                                     .config_props    = config_props, },
 230                                   { .name = NULL}},
 231 };