libavfilter/video.c

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * Libav is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include <string.h>
  20 #include <stdio.h>
  21
  22 #include "libavutil/imgutils.h"
  23 #include "libavutil/mem.h"
  24
  25 #include "avfilter.h"
  26 #include "internal.h"
  27 #include "video.h"
  28
  29 #ifdef DEBUG
  30 static char *ff_get_ref_perms_string(char *buf, size_t buf_size, int perms)
  31 {
  32     snprintf(buf, buf_size, "%s%s%s%s%s%s",
  33              perms & AV_PERM_READ      ? "r" : "",
  34              perms & AV_PERM_WRITE     ? "w" : "",
  35              perms & AV_PERM_PRESERVE  ? "p" : "",
  36              perms & AV_PERM_REUSE     ? "u" : "",
  37              perms & AV_PERM_REUSE2    ? "U" : "",
  38              perms & AV_PERM_NEG_LINESIZES ? "n" : "");
  39     return buf;
  40 }
  41 #endif
  42
  43 static void ff_dlog_ref(void *ctx, AVFilterBufferRef *ref, int end)
  44 {
  45     av_unused char buf[16];
  46     av_dlog(ctx,
  47             "ref[%p buf:%p refcount:%d perms:%s data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
  48             ref, ref->buf, ref->buf->refcount, ff_get_ref_perms_string(buf, sizeof(buf), ref->perms), ref->data[0],
  49             ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
  50             ref->pts, ref->pos);
  51
  52     if (ref->video) {
  53         av_dlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
  54                 ref->video->pixel_aspect.num, ref->video->pixel_aspect.den,
  55                 ref->video->w, ref->video->h,
  56                 !ref->video->interlaced     ? 'P' :         /* Progressive  */
  57                 ref->video->top_field_first ? 'T' : 'B',    /* Top / Bottom */
  58                 ref->video->key_frame,
  59                 av_get_picture_type_char(ref->video->pict_type));
  60     }
  61     if (ref->audio) {
  62         av_dlog(ctx, " cl:%"PRId64"d n:%d r:%d p:%d",
  63                 ref->audio->channel_layout,
  64                 ref->audio->nb_samples,
  65                 ref->audio->sample_rate,
  66                 ref->audio->planar);
  67     }
  68
  69     av_dlog(ctx, "]%s", end ? "\n" : "");
  70 }
  71
  72 AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
  73 {
  74     return ff_get_video_buffer(link->dst->outputs[0], perms, w, h);
  75 }
  76
  77 /* TODO: set the buffer's priv member to a context structure for the whole
  78  * filter chain.  This will allow for a buffer pool instead of the constant
  79  * alloc & free cycle currently implemented. */
  80 AVFilterBufferRef *ff_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
  81 {
  82     int linesize[4];
  83     uint8_t *data[4];
  84     AVFilterBufferRef *picref = NULL;
  85
  86     // +2 is needed for swscaler, +16 to be SIMD-friendly
  87     if (av_image_alloc(data, linesize, w, h, link->format, 16) < 0)
  88         return NULL;
  89
  90     picref = avfilter_get_video_buffer_ref_from_arrays(data, linesize,
  91                                                        perms, w, h, link->format);
  92     if (!picref) {
  93         av_free(data[0]);
  94         return NULL;
  95     }
  96
  97     return picref;
  98 }
  99
 100 AVFilterBufferRef *
 101 avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int perms,
 102                                           int w, int h, enum AVPixelFormat format)
 103 {
 104     AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
 105     AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
 106
 107     if (!pic || !picref)
 108         goto fail;
 109
 110     picref->buf = pic;
 111     picref->buf->free = ff_avfilter_default_free_buffer;
 112     if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
 113         goto fail;
 114
 115     pic->w = picref->video->w = w;
 116     pic->h = picref->video->h = h;
 117
 118     /* make sure the buffer gets read permission or it's useless for output */
 119     picref->perms = perms | AV_PERM_READ;
 120
 121     pic->refcount = 1;
 122     picref->type = AVMEDIA_TYPE_VIDEO;
 123     pic->format = picref->format = format;
 124
 125     memcpy(pic->data,        data,          4*sizeof(data[0]));
 126     memcpy(pic->linesize,    linesize,      4*sizeof(linesize[0]));
 127     memcpy(picref->data,     pic->data,     sizeof(picref->data));
 128     memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
 129
 130     pic->   extended_data = pic->data;
 131     picref->extended_data = picref->data;
 132
 133     picref->pts = AV_NOPTS_VALUE;
 134
 135     return picref;
 136
 137 fail:
 138     if (picref && picref->video)
 139         av_free(picref->video);
 140     av_free(picref);
 141     av_free(pic);
 142     return NULL;
 143 }
 144
 145 AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
 146 {
 147     AVFilterBufferRef *ret = NULL;
 148
 149     av_unused char buf[16];
 150     FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0);
 151     av_dlog(NULL, " perms:%s w:%d h:%d\n", ff_get_ref_perms_string(buf, sizeof(buf), perms), w, h);
 152
 153     if (link->dstpad->get_video_buffer)
 154         ret = link->dstpad->get_video_buffer(link, perms, w, h);
 155
 156     if (!ret)
 157         ret = ff_default_get_video_buffer(link, perms, w, h);
 158
 159     if (ret)
 160         ret->type = AVMEDIA_TYPE_VIDEO;
 161
 162     FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0); av_dlog(NULL, " returning "); ff_dlog_ref(NULL, ret, 1);
 163
 164     return ret;
 165 }