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/imgutils.h"
  26 #include "libavcodec/avcodec.h"
  27
  28 #include "avfilter.h"
  29 #include "internal.h"
  30 #include "audio.h"
  31 #include "avcodec.h"
  32
  33 void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
  34 {
  35     if (ptr->extended_data != ptr->data)
  36         av_freep(&ptr->extended_data);
  37     av_free(ptr->data[0]);
  38     av_free(ptr);
  39 }
  40
  41 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
  42 {
  43     AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
  44     if (!ret)
  45         return NULL;
  46     *ret = *ref;
  47     if (ref->type == AVMEDIA_TYPE_VIDEO) {
  48         ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
  49         if (!ret->video) {
  50             av_free(ret);
  51             return NULL;
  52         }
  53         *ret->video = *ref->video;
  54         ret->extended_data = ret->data;
  55     } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
  56         ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
  57         if (!ret->audio) {
  58             av_free(ret);
  59             return NULL;
  60         }
  61         *ret->audio = *ref->audio;
  62
  63         if (ref->extended_data && ref->extended_data != ref->data) {
  64             int nb_channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
  65             if (!(ret->extended_data = av_malloc(sizeof(*ret->extended_data) *
  66                                                  nb_channels))) {
  67                 av_freep(&ret->audio);
  68                 av_freep(&ret);
  69                 return NULL;
  70             }
  71             memcpy(ret->extended_data, ref->extended_data,
  72                    sizeof(*ret->extended_data) * nb_channels);
  73         } else
  74             ret->extended_data = ret->data;
  75     }
  76     ret->perms &= pmask;
  77     ret->buf->refcount ++;
  78     return ret;
  79 }
  80
  81 void ff_free_pool(AVFilterPool *pool)
  82 {
  83     int i;
  84
  85     av_assert0(pool->refcount > 0);
  86
  87     for (i = 0; i < POOL_SIZE; i++) {
  88         if (pool->pic[i]) {
  89             AVFilterBufferRef *picref = pool->pic[i];
  90             /* free buffer: picrefs stored in the pool are not
  91              * supposed to contain a free callback */
  92             av_assert0(!picref->buf->refcount);
  93             av_freep(&picref->buf->data[0]);
  94             av_freep(&picref->buf);
  95
  96             av_freep(&picref->audio);
  97             av_freep(&picref->video);
  98             av_freep(&pool->pic[i]);
  99             pool->count--;
 100         }
 101     }
 102     pool->draining = 1;
 103
 104     if (!--pool->refcount) {
 105         av_assert0(!pool->count);
 106         av_free(pool);
 107     }
 108 }
 109
 110 static void store_in_pool(AVFilterBufferRef *ref)
 111 {
 112     int i;
 113     AVFilterPool *pool= ref->buf->priv;
 114
 115     av_assert0(ref->buf->data[0]);
 116     av_assert0(pool->refcount>0);
 117
 118     if (pool->count == POOL_SIZE) {
 119         AVFilterBufferRef *ref1 = pool->pic[0];
 120         av_freep(&ref1->video);
 121         av_freep(&ref1->audio);
 122         av_freep(&ref1->buf->data[0]);
 123         av_freep(&ref1->buf);
 124         av_free(ref1);
 125         memmove(&pool->pic[0], &pool->pic[1], sizeof(void*)*(POOL_SIZE-1));
 126         pool->count--;
 127         pool->pic[POOL_SIZE-1] = NULL;
 128     }
 129
 130     for (i = 0; i < POOL_SIZE; i++) {
 131         if (!pool->pic[i]) {
 132             pool->pic[i] = ref;
 133             pool->count++;
 134             break;
 135         }
 136     }
 137     if (pool->draining) {
 138         ff_free_pool(pool);
 139     } else
 140         --pool->refcount;
 141 }
 142
 143 void avfilter_unref_buffer(AVFilterBufferRef *ref)
 144 {
 145     if (!ref)
 146         return;
 147     av_assert0(ref->buf->refcount > 0);
 148     if (!(--ref->buf->refcount)) {
 149         if (!ref->buf->free) {
 150             store_in_pool(ref);
 151             return;
 152         }
 153         ref->buf->free(ref->buf);
 154     }
 155     if (ref->extended_data != ref->data)
 156         av_freep(&ref->extended_data);
 157     av_freep(&ref->video);
 158     av_freep(&ref->audio);
 159     av_free(ref);
 160 }
 161
 162 void avfilter_unref_bufferp(AVFilterBufferRef **ref)
 163 {
 164     avfilter_unref_buffer(*ref);
 165     *ref = NULL;
 166 }
 167
 168 void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src)
 169 {
 170     // copy common properties
 171     dst->pts             = src->pts;
 172     dst->pos             = src->pos;
 173
 174     switch (src->type) {
 175     case AVMEDIA_TYPE_VIDEO: *dst->video = *src->video; break;
 176     case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
 177     default: break;
 178     }
 179 }
 180
 181 AVFilterBufferRef *ff_copy_buffer_ref(AVFilterLink *outlink,
 182                                       AVFilterBufferRef *ref)
 183 {
 184     AVFilterBufferRef *buf;
 185     int channels;
 186
 187     switch (outlink->type) {
 188
 189     case AVMEDIA_TYPE_VIDEO:
 190         buf = ff_get_video_buffer(outlink, AV_PERM_WRITE,
 191                                   ref->video->w, ref->video->h);
 192         if(!buf)
 193             return NULL;
 194         av_image_copy(buf->data, buf->linesize,
 195                       (void*)ref->data, ref->linesize,
 196                       ref->format, ref->video->w, ref->video->h);
 197         break;
 198
 199     case AVMEDIA_TYPE_AUDIO:
 200         buf = ff_get_audio_buffer(outlink, AV_PERM_WRITE,
 201                                         ref->audio->nb_samples);
 202         if(!buf)
 203             return NULL;
 204         channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
 205         av_samples_copy(buf->extended_data, ref->buf->extended_data,
 206                         0, 0, ref->audio->nb_samples,
 207                         channels,
 208                         ref->format);
 209         break;
 210
 211     default:
 212         return NULL;
 213     }
 214     avfilter_copy_buffer_ref_props(buf, ref);
 215     return buf;
 216 }