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 int 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  if (!dst->qp_table) {
51  av_log(NULL, AV_LOG_ERROR, "Failed to allocate qp_table\n");
52  dst->qp_table_size = 0;
53  return AVERROR(ENOMEM);
54  }
55  memcpy(dst->qp_table, src->qp_table, qsize);
56  }
57  return 0;
58 }
59 
60 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
61 {
62  AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
63  if (!ret)
64  return NULL;
65  *ret = *ref;
66 
67  ret->metadata = NULL;
68  av_dict_copy(&ret->metadata, ref->metadata, 0);
69 
70  if (ref->type == AVMEDIA_TYPE_VIDEO) {
71  ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
72  if (!ret->video) {
73  av_free(ret);
74  return NULL;
75  }
76  copy_video_props(ret->video, ref->video);
77  ret->extended_data = ret->data;
78  } else if (ref->type == AVMEDIA_TYPE_AUDIO) {
79  ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
80  if (!ret->audio) {
81  av_free(ret);
82  return NULL;
83  }
84  *ret->audio = *ref->audio;
85 
86  if (ref->extended_data && ref->extended_data != ref->data) {
87  int nb_channels = av_get_channel_layout_nb_channels(ref->audio->channel_layout);
88  if (!(ret->extended_data = av_malloc_array(sizeof(*ret->extended_data),
89  nb_channels))) {
90  av_freep(&ret->audio);
91  av_freep(&ret);
92  return NULL;
93  }
94  memcpy(ret->extended_data, ref->extended_data,
95  sizeof(*ret->extended_data) * nb_channels);
96  } else
97  ret->extended_data = ret->data;
98  }
99  ret->perms &= pmask;
100  ret->buf->refcount ++;
101  return ret;
102 }
103 
104 void avfilter_unref_buffer(AVFilterBufferRef *ref)
105 {
106  if (!ref)
107  return;
108  av_assert0(ref->buf->refcount > 0);
109  if (!(--ref->buf->refcount))
110  ref->buf->free(ref->buf);
111  if (ref->extended_data != ref->data)
112  av_freep(&ref->extended_data);
113  if (ref->video)
114  av_freep(&ref->video->qp_table);
115  av_freep(&ref->video);
116  av_freep(&ref->audio);
117  av_dict_free(&ref->metadata);
118  av_free(ref);
119 }
120 
121 void avfilter_unref_bufferp(AVFilterBufferRef **ref)
122 {
124  avfilter_unref_buffer(*ref);
126  *ref = NULL;
127 }
128 
129 int avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src)
130 {
131  dst->pts = src->pts;
132  dst->pos = av_frame_get_pkt_pos(src);
133  dst->format = src->format;
134 
135  av_dict_free(&dst->metadata);
136  av_dict_copy(&dst->metadata, av_frame_get_metadata(src), 0);
137 
138  switch (dst->type) {
139  case AVMEDIA_TYPE_VIDEO:
140  dst->video->w = src->width;
141  dst->video->h = src->height;
142  dst->video->sample_aspect_ratio = src->sample_aspect_ratio;
143  dst->video->interlaced = src->interlaced_frame;
144  dst->video->top_field_first = src->top_field_first;
145  dst->video->key_frame = src->key_frame;
146  dst->video->pict_type = src->pict_type;
147  break;
148  case AVMEDIA_TYPE_AUDIO:
149  dst->audio->sample_rate = src->sample_rate;
150  dst->audio->channel_layout = src->channel_layout;
151  break;
152  default:
153  return AVERROR(EINVAL);
154  }
155 
156  return 0;
157 }
158 
159 void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, const AVFilterBufferRef *src)
160 {
161  // copy common properties
162  dst->pts = src->pts;
163  dst->pos = src->pos;
164 
165  switch (src->type) {
166  case AVMEDIA_TYPE_VIDEO: {
167  if (dst->video->qp_table)
168  av_freep(&dst->video->qp_table);
169  copy_video_props(dst->video, src->video);
170  break;
171  }
172  case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
173  default: break;
174  }
175 
176  av_dict_free(&dst->metadata);
177  av_dict_copy(&dst->metadata, src->metadata, 0);
178 }
179 #endif /* FF_API_AVFILTERBUFFER */