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

   1 /*
   2  * Copyright Stefano Sabatini <stefasab gmail com>
   3  * Copyright Anton Khirnov <anton khirnov net>
   4  * Copyright Michael Niedermayer <michaelni gmx at>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "libavutil/audioconvert.h"
  24 #include "libavutil/avassert.h"
  25 #include "libavutil/common.h"
  26 #include "libavutil/imgutils.h"
  27 #include "libavcodec/avcodec.h"
  28
  29 #include "avfilter.h"
  30 #include "internal.h"
  31 #include "audio.h"
  32 #include "avcodec.h"
  33
  34 void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
  35 {
  36     if (ptr->extended_data != ptr->data)
  37         av_freep(&ptr->extended_data);
  38     av_free(ptr->data[0]);
  39     av_free(ptr);
  40 }
  41
  42 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
  43 {
  44     AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
  45     if (!ret)
  46         return NULL;
  47     *ret = *ref;
  48     if (ref->type == AVMEDIA_TYPE_VIDEO) {
  49         ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
  50         if (!ret->video) {
  51             av_free(ret);
  52             return NULL;
  53         }
  54         *ret->video = *ref->video;
  55         ret->extended_data = ret->data;
  56     } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
  57         ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
  58         if (!ret->audio) {
  59             av_free(ret);
  60             return NULL;
  61         }
  62         *ret->audio = *ref->audio;
  63
  64         if (ref->extended_data && ref->extended_data != ref->data) {
  65             int nb_channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
  66             if (!(ret->extended_data = av_malloc(sizeof(*ret->extended_data) *
  67                                                  nb_channels))) {
  68                 av_freep(&ret->audio);
  69                 av_freep(&ret);
  70                 return NULL;
  71             }
  72             memcpy(ret->extended_data, ref->extended_data,
  73                    sizeof(*ret->extended_data) * nb_channels);
  74         } else
  75             ret->extended_data = ret->data;
  76     }
  77     ret->perms &= pmask;
  78     ret->buf->refcount ++;
  79     return ret;
  80 }
  81
  82 void ff_free_pool(AVFilterPool *pool)
  83 {
  84     int i;
  85
  86     av_assert0(pool->refcount > 0);
  87
  88     for (i = 0; i < POOL_SIZE; i++) {
  89         if (pool->pic[i]) {
  90             AVFilterBufferRef *picref = pool->pic[i];
  91             /* free buffer: picrefs stored in the pool are not
  92              * supposed to contain a free callback */
  93             av_assert0(!picref->buf->refcount);
  94             av_freep(&picref->buf->data[0]);
  95             av_freep(&picref->buf);
  96
  97             av_freep(&picref->audio);
  98             av_freep(&picref->video);
  99             av_freep(&pool->pic[i]);
 100             pool->count--;
 101         }
 102     }
 103     pool->draining = 1;
 104
 105     if (!--pool->refcount) {
 106         av_assert0(!pool->count);
 107         av_free(pool);
 108     }
 109 }
 110
 111 static void store_in_pool(AVFilterBufferRef *ref)
 112 {
 113     int i;
 114     AVFilterPool *pool= ref->buf->priv;
 115
 116     av_assert0(ref->buf->data[0]);
 117     av_assert0(pool->refcount>0);
 118
 119     if (pool->count == POOL_SIZE) {
 120         AVFilterBufferRef *ref1 = pool->pic[0];
 121         av_freep(&ref1->video);
 122         av_freep(&ref1->audio);
 123         av_freep(&ref1->buf->data[0]);
 124         av_freep(&ref1->buf);
 125         av_free(ref1);
 126         memmove(&pool->pic[0], &pool->pic[1], sizeof(void*)*(POOL_SIZE-1));
 127         pool->count--;
 128         pool->pic[POOL_SIZE-1] = NULL;
 129     }
 130
 131     for (i = 0; i < POOL_SIZE; i++) {
 132         if (!pool->pic[i]) {
 133             pool->pic[i] = ref;
 134             pool->count++;
 135             break;
 136         }
 137     }
 138     if (pool->draining) {
 139         ff_free_pool(pool);
 140     } else
 141         --pool->refcount;
 142 }
 143
 144 void avfilter_unref_buffer(AVFilterBufferRef *ref)
 145 {
 146     if (!ref)
 147         return;
 148     av_assert0(ref->buf->refcount > 0);
 149     if (!(--ref->buf->refcount)) {
 150         if (!ref->buf->free) {
 151             store_in_pool(ref);
 152             return;
 153         }
 154         ref->buf->free(ref->buf);
 155     }
 156     if (ref->extended_data != ref->data)
 157         av_freep(&ref->extended_data);
 158     av_freep(&ref->video);
 159     av_freep(&ref->audio);
 160     av_free(ref);
 161 }
 162
 163 void avfilter_unref_bufferp(AVFilterBufferRef **ref)
 164 {
 165     avfilter_unref_buffer(*ref);
 166     *ref = NULL;
 167 }
 168
 169 void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src)
 170 {
 171     // copy common properties
 172     dst->pts             = src->pts;
 173     dst->pos             = src->pos;
 174
 175     switch (src->type) {
 176     case AVMEDIA_TYPE_VIDEO: *dst->video = *src->video; break;
 177     case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
 178     default: break;
 179     }
 180 }
 181
 182 AVFilterBufferRef *ff_copy_buffer_ref(AVFilterLink *outlink,
 183                                       AVFilterBufferRef *ref)
 184 {
 185     AVFilterBufferRef *buf;
 186     int channels;
 187
 188     switch (outlink->type) {
 189
 190     case AVMEDIA_TYPE_VIDEO:
 191         buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,
 192                                   ref->video->w, ref->video->h);
 193         if(!buf)
 194             return NULL;
 195         av_image_copy(buf->data, buf->linesize,
 196                       (void*)ref->data, ref->linesize,
 197                       ref->format, ref->video->w, ref->video->h);
 198         break;
 199
 200     case AVMEDIA_TYPE_AUDIO:
 201         buf = ff_get_audio_buffer(outlink, AV_PERM_WRITE,
 202                                         ref->audio->nb_samples);
 203         if(!buf)
 204             return NULL;
 205         channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
 206         av_samples_copy(buf->extended_data, ref->buf->extended_data,
 207                         0, 0, ref->audio->nb_samples,
 208                         channels,
 209                         ref->format);
 210         break;
 211
 212     default:
 213         return NULL;
 214     }
 215     avfilter_copy_buffer_ref_props(buf, ref);
 216     return buf;
 217 }