FFmpeg
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buffer.c
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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 
24 #include "libavutil/avassert.h"
25 #include "libavutil/common.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/internal.h"
28 #include "libavcodec/avcodec.h"
29 
30 #include "avfilter.h"
31 #include "internal.h"
32 #include "audio.h"
33 #include "avcodec.h"
34 #include "version.h"
35 
36 #if FF_API_AVFILTERBUFFER
37 void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
38 {
39  if (ptr->extended_data != ptr->data)
40  av_freep(&ptr->extended_data);
41  av_freep(&ptr->data[0]);
42  av_free(ptr);
43 }
44 
45 static void copy_video_props(AVFilterBufferRefVideoProps *dst, AVFilterBufferRefVideoProps *src) {
46  *dst = *src;
47  if (src->qp_table) {
48  int qsize = src->qp_table_size;
49  dst->qp_table = av_malloc(qsize);
50  memcpy(dst->qp_table, src->qp_table, qsize);
51  }
52 }
53 
54 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
55 {
56  AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
57  if (!ret)
58  return NULL;
59  *ret = *ref;
60 
61  ret->metadata = NULL;
62  av_dict_copy(&ret->metadata, ref->metadata, 0);
63 
64  if (ref->type == AVMEDIA_TYPE_VIDEO) {
65  ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
66  if (!ret->video) {
67  av_free(ret);
68  return NULL;
69  }
70  copy_video_props(ret->video, ref->video);
71  ret->extended_data = ret->data;
72  } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
73  ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
74  if (!ret->audio) {
75  av_free(ret);
76  return NULL;
77  }
78  *ret->audio = *ref->audio;
79 
80  if (ref->extended_data && ref->extended_data != ref->data) {
81  int nb_channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
82  if (!(ret->extended_data = av_malloc_array(sizeof(*ret->extended_data),
83  nb_channels))) {
84  av_freep(&ret->audio);
85  av_freep(&ret);
86  return NULL;
87  }
88  memcpy(ret->extended_data, ref->extended_data,
89  sizeof(*ret->extended_data) * nb_channels);
90  } else
91  ret->extended_data = ret->data;
92  }
93  ret->perms &= pmask;
94  ret->buf->refcount ++;
95  return ret;
96 }
97 
98 void avfilter_unref_buffer(AVFilterBufferRef *ref)
99 {
100  if (!ref)
101  return;
102  av_assert0(ref->buf->refcount > 0);
103  if (!(--ref->buf->refcount))
104  ref->buf->free(ref->buf);
105  if (ref->extended_data != ref->data)
106  av_freep(&ref->extended_data);
107  if (ref->video)
108  av_freep(&ref->video->qp_table);
109  av_freep(&ref->video);
110  av_freep(&ref->audio);
111  av_dict_free(&ref->metadata);
112  av_free(ref);
113 }
114 
115 void avfilter_unref_bufferp(AVFilterBufferRef **ref)
116 {
118  avfilter_unref_buffer(*ref);
120  *ref = NULL;
121 }
122 
123 int avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src)
124 {
125  dst->pts = src->pts;
126  dst->pos = av_frame_get_pkt_pos(src);
127  dst->format = src->format;
128 
129  av_dict_free(&dst->metadata);
130  av_dict_copy(&dst->metadata, av_frame_get_metadata(src), 0);
131 
132  switch (dst->type) {
133  case AVMEDIA_TYPE_VIDEO:
134  dst->video->w = src->width;
135  dst->video->h = src->height;
136  dst->video->sample_aspect_ratio = src->sample_aspect_ratio;
137  dst->video->interlaced = src->interlaced_frame;
138  dst->video->top_field_first = src->top_field_first;
139  dst->video->key_frame = src->key_frame;
140  dst->video->pict_type = src->pict_type;
141  break;
142  case AVMEDIA_TYPE_AUDIO:
143  dst->audio->sample_rate = src->sample_rate;
144  dst->audio->channel_layout = src->channel_layout;
145  break;
146  default:
147  return AVERROR(EINVAL);
148  }
149 
150  return 0;
151 }
152 
153 void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, const AVFilterBufferRef *src)
154 {
155  // copy common properties
156  dst->pts = src->pts;
157  dst->pos = src->pos;
158 
159  switch (src->type) {
160  case AVMEDIA_TYPE_VIDEO: {
161  if (dst->video->qp_table)
162  av_freep(&dst->video->qp_table);
163  copy_video_props(dst->video, src->video);
164  break;
165  }
166  case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
167  default: break;
168  }
169 
170  av_dict_free(&dst->metadata);
171  av_dict_copy(&dst->metadata, src->metadata, 0);
172 }
173 #endif /* FF_API_AVFILTERBUFFER */