libavfilter/buffer.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 "libavutil/channel_layout.h"
  20 #include "libavutil/common.h"
  21 #include "libavcodec/avcodec.h"
  22
  23 #include "avfilter.h"
  24 #include "internal.h"
  25
  26 /* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */
  27 void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
  28 {
  29     if (ptr->extended_data != ptr->data)
  30         av_freep(&ptr->extended_data);
  31     av_free(ptr->data[0]);
  32     av_free(ptr);
  33 }
  34
  35 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
  36 {
  37     AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
  38     if (!ret)
  39         return NULL;
  40     *ret = *ref;
  41     if (ref->type == AVMEDIA_TYPE_VIDEO) {
  42         ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
  43         if (!ret->video) {
  44             av_free(ret);
  45             return NULL;
  46         }
  47         *ret->video = *ref->video;
  48         ret->extended_data = ret->data;
  49     } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
  50         ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
  51         if (!ret->audio) {
  52             av_free(ret);
  53             return NULL;
  54         }
  55         *ret->audio = *ref->audio;
  56
  57         if (ref->extended_data != ref->data) {
  58             int nb_channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
  59             if (!(ret->extended_data = av_malloc(sizeof(*ret->extended_data) *
  60                                                  nb_channels))) {
  61                 av_freep(&ret->audio);
  62                 av_freep(&ret);
  63                 return NULL;
  64             }
  65             memcpy(ret->extended_data, ref->extended_data,
  66                    sizeof(*ret->extended_data) * nb_channels);
  67         } else
  68             ret->extended_data = ret->data;
  69     }
  70     ret->perms &= pmask;
  71     ret->buf->refcount ++;
  72     return ret;
  73 }
  74
  75 void avfilter_unref_buffer(AVFilterBufferRef *ref)
  76 {
  77     if (!ref)
  78         return;
  79     if (!(--ref->buf->refcount))
  80         ref->buf->free(ref->buf);
  81     if (ref->extended_data != ref->data)
  82         av_freep(&ref->extended_data);
  83     av_free(ref->video);
  84     av_free(ref->audio);
  85     av_free(ref);
  86 }
  87
  88 void avfilter_unref_bufferp(AVFilterBufferRef **ref)
  89 {
  90     avfilter_unref_buffer(*ref);
  91     *ref = NULL;
  92 }
  93
  94 int avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src)
  95 {
  96     dst->pts    = src->pts;
  97     dst->format = src->format;
  98
  99     switch (dst->type) {
 100     case AVMEDIA_TYPE_VIDEO:
 101         dst->video->w                   = src->width;
 102         dst->video->h                   = src->height;
 103         dst->video->pixel_aspect        = src->sample_aspect_ratio;
 104         dst->video->interlaced          = src->interlaced_frame;
 105         dst->video->top_field_first     = src->top_field_first;
 106         dst->video->key_frame           = src->key_frame;
 107         dst->video->pict_type           = src->pict_type;
 108         break;
 109     case AVMEDIA_TYPE_AUDIO:
 110         dst->audio->sample_rate         = src->sample_rate;
 111         dst->audio->channel_layout      = src->channel_layout;
 112         break;
 113     default:
 114         return AVERROR(EINVAL);
 115     }
 116
 117     return 0;
 118 }
 119
 120 int avfilter_copy_buf_props(AVFrame *dst, const AVFilterBufferRef *src)
 121 {
 122     int planes, nb_channels;
 123
 124     memcpy(dst->data, src->data, sizeof(dst->data));
 125     memcpy(dst->linesize, src->linesize, sizeof(dst->linesize));
 126
 127     dst->pts     = src->pts;
 128     dst->format  = src->format;
 129
 130     switch (src->type) {
 131     case AVMEDIA_TYPE_VIDEO:
 132         dst->width               = src->video->w;
 133         dst->height              = src->video->h;
 134         dst->sample_aspect_ratio = src->video->pixel_aspect;
 135         dst->interlaced_frame    = src->video->interlaced;
 136         dst->top_field_first     = src->video->top_field_first;
 137         dst->key_frame           = src->video->key_frame;
 138         dst->pict_type           = src->video->pict_type;
 139         break;
 140     case AVMEDIA_TYPE_AUDIO:
 141         nb_channels = av_get_channel_layout_nb_channels(src->audio->channel_layout);
 142         planes      = av_sample_fmt_is_planar(src->format) ? nb_channels : 1;
 143
 144         if (planes > FF_ARRAY_ELEMS(dst->data)) {
 145             dst->extended_data = av_mallocz(planes * sizeof(*dst->extended_data));
 146             if (!dst->extended_data)
 147                 return AVERROR(ENOMEM);
 148             memcpy(dst->extended_data, src->extended_data,
 149                    planes * sizeof(*dst->extended_data));
 150         } else
 151             dst->extended_data = dst->data;
 152
 153         dst->sample_rate         = src->audio->sample_rate;
 154         dst->channel_layout      = src->audio->channel_layout;
 155         dst->nb_samples          = src->audio->nb_samples;
 156         break;
 157     default:
 158         return AVERROR(EINVAL);
 159     }
 160
 161     return 0;
 162 }
 163
 164 void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src)
 165 {
 166     // copy common properties
 167     dst->pts             = src->pts;
 168     dst->pos             = src->pos;
 169
 170     switch (src->type) {
 171     case AVMEDIA_TYPE_VIDEO: *dst->video = *src->video; break;
 172     case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
 173     default: break;
 174     }
 175 }