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1 /*
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2 * This file is part of FFmpeg.
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3 *
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4 * FFmpeg is free software; you can redistribute it and/or
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5 * modify it under the terms of the GNU Lesser General Public
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6 * License as published by the Free Software Foundation; either
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7 * version 2.1 of the License, or (at your option) any later version.
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8 *
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9 * FFmpeg is distributed in the hope that it will be useful,
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 * Lesser General Public License for more details.
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13 *
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14 * You should have received a copy of the GNU Lesser General Public
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15 * License along with FFmpeg; if not, write to the Free Software
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16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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17 */
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18
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19 #include <stdint.h>
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20 #include <string.h>
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21
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22 #include "atomic.h"
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23 #include "buffer_internal.h"
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24 #include "common.h"
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25 #include "mem.h"
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26
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27 AVBufferRef *av_buffer_create(uint8_t *data, int size,
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28 void (*free)(void *opaque, uint8_t *data),
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29 void *opaque, int flags)
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30 {
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31 AVBufferRef *ref = NULL;
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32 AVBuffer *buf = NULL;
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33
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34 buf = av_mallocz(sizeof(*buf));
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35 if (!buf)
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36 return NULL;
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37
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38 buf->data = data;
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39 buf->size = size;
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40 buf->free = free ? free : av_buffer_default_free;
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41 buf->opaque = opaque;
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42 buf->refcount = 1;
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43
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44 if (flags & AV_BUFFER_FLAG_READONLY)
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45 buf->flags |= BUFFER_FLAG_READONLY;
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46
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47 ref = av_mallocz(sizeof(*ref));
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48 if (!ref) {
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49 av_freep(&buf);
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50 return NULL;
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51 }
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52
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53 ref->buffer = buf;
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54 ref->data = data;
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55 ref->size = size;
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56
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57 return ref;
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58 }
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59
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60 void av_buffer_default_free(void *opaque, uint8_t *data)
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61 {
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62 av_free(data);
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63 }
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64
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65 AVBufferRef *av_buffer_alloc(int size)
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66 {
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67 AVBufferRef *ret = NULL;
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68 uint8_t *data = NULL;
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69
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70 data = av_malloc(size);
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71 if (!data)
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72 return NULL;
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73
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74 ret = av_buffer_create(data, size, av_buffer_default_free, NULL, 0);
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75 if (!ret)
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76 av_freep(&data);
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77
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78 return ret;
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79 }
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80
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81 AVBufferRef *av_buffer_allocz(int size)
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82 {
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83 AVBufferRef *ret = av_buffer_alloc(size);
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84 if (!ret)
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85 return NULL;
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86
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87 memset(ret->data, 0, size);
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88 return ret;
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89 }
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90
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91 AVBufferRef *av_buffer_ref(AVBufferRef *buf)
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92 {
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93 AVBufferRef *ret = av_mallocz(sizeof(*ret));
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94
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95 if (!ret)
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96 return NULL;
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97
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98 *ret = *buf;
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99
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100 avpriv_atomic_int_add_and_fetch(&buf->buffer->refcount, 1);
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101
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102 return ret;
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103 }
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104
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105 void av_buffer_unref(AVBufferRef **buf)
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106 {
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107 AVBuffer *b;
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108
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109 if (!buf || !*buf)
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110 return;
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111 b = (*buf)->buffer;
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112 av_freep(buf);
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113
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114 if (!avpriv_atomic_int_add_and_fetch(&b->refcount, -1)) {
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115 b->free(b->opaque, b->data);
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116 av_freep(&b);
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117 }
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118 }
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119
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120 int av_buffer_is_writable(const AVBufferRef *buf)
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121 {
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122 if (buf->buffer->flags & AV_BUFFER_FLAG_READONLY)
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123 return 0;
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124
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125 return avpriv_atomic_int_get(&buf->buffer->refcount) == 1;
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126 }
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127
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128 void *av_buffer_get_opaque(const AVBufferRef *buf)
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129 {
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130 return buf->buffer->opaque;
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131 }
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132
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133 int av_buffer_get_ref_count(const AVBufferRef *buf)
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134 {
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135 return buf->buffer->refcount;
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136 }
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137
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138 int av_buffer_make_writable(AVBufferRef **pbuf)
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139 {
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140 AVBufferRef *newbuf, *buf = *pbuf;
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141
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142 if (av_buffer_is_writable(buf))
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143 return 0;
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144
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145 newbuf = av_buffer_alloc(buf->size);
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146 if (!newbuf)
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147 return AVERROR(ENOMEM);
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148
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149 memcpy(newbuf->data, buf->data, buf->size);
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150 av_buffer_unref(pbuf);
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151 *pbuf = newbuf;
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152
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153 return 0;
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154 }
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155
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156 int av_buffer_realloc(AVBufferRef **pbuf, int size)
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157 {
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158 AVBufferRef *buf = *pbuf;
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159 uint8_t *tmp;
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160
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161 if (!buf) {
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162 /* allocate a new buffer with av_realloc(), so it will be reallocatable
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163 * later */
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164 uint8_t *data = av_realloc(NULL, size);
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165 if (!data)
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166 return AVERROR(ENOMEM);
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167
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168 buf = av_buffer_create(data, size, av_buffer_default_free, NULL, 0);
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169 if (!buf) {
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170 av_freep(&data);
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171 return AVERROR(ENOMEM);
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172 }
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173
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174 buf->buffer->flags |= BUFFER_FLAG_REALLOCATABLE;
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175 *pbuf = buf;
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176
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177 return 0;
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178 } else if (buf->size == size)
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179 return 0;
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180
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181 if (!(buf->buffer->flags & BUFFER_FLAG_REALLOCATABLE) ||
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182 !av_buffer_is_writable(buf)) {
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183 /* cannot realloc, allocate a new reallocable buffer and copy data */
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184 AVBufferRef *new = NULL;
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185
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186 av_buffer_realloc(&new, size);
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187 if (!new)
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188 return AVERROR(ENOMEM);
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189
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190 memcpy(new->data, buf->data, FFMIN(size, buf->size));
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191
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192 av_buffer_unref(pbuf);
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193 *pbuf = new;
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194 return 0;
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195 }
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196
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197 tmp = av_realloc(buf->buffer->data, size);
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198 if (!tmp)
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199 return AVERROR(ENOMEM);
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200
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201 buf->buffer->data = buf->data = tmp;
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202 buf->buffer->size = buf->size = size;
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203 return 0;
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204 }
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205
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206 AVBufferPool *av_buffer_pool_init(int size, AVBufferRef* (*alloc)(int size))
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207 {
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208 AVBufferPool *pool = av_mallocz(sizeof(*pool));
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209 if (!pool)
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210 return NULL;
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211
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212 pool->size = size;
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213 pool->alloc = alloc ? alloc : av_buffer_alloc;
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214
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215 avpriv_atomic_int_set(&pool->refcount, 1);
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216
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217 return pool;
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218 }
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219
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220 /*
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221 * This function gets called when the pool has been uninited and
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222 * all the buffers returned to it.
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223 */
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224 static void buffer_pool_free(AVBufferPool *pool)
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225 {
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226 while (pool->pool) {
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227 BufferPoolEntry *buf = pool->pool;
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228 pool->pool = buf->next;
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229
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230 buf->free(buf->opaque, buf->data);
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231 av_freep(&buf);
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232 }
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233 av_freep(&pool);
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234 }
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235
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236 void av_buffer_pool_uninit(AVBufferPool **ppool)
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237 {
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238 AVBufferPool *pool;
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239
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240 if (!ppool || !*ppool)
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241 return;
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242 pool = *ppool;
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243 *ppool = NULL;
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244
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245 if (!avpriv_atomic_int_add_and_fetch(&pool->refcount, -1))
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246 buffer_pool_free(pool);
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247 }
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248
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249 /* remove the whole buffer list from the pool and return it */
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250 static BufferPoolEntry *get_pool(AVBufferPool *pool)
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251 {
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252 BufferPoolEntry *cur = *(void * volatile *)&pool->pool, *last = NULL;
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253
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254 while (cur != last) {
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255 last = cur;
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256 cur = avpriv_atomic_ptr_cas((void * volatile *)&pool->pool, last, NULL);
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257 if (!cur)
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258 return NULL;
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259 }
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260
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261 return cur;
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262 }
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263
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264 static void add_to_pool(BufferPoolEntry *buf)
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265 {
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266 AVBufferPool *pool;
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267 BufferPoolEntry *cur, *end = buf;
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268
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269 if (!buf)
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270 return;
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271 pool = buf->pool;
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272
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273 while (end->next)
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274 end = end->next;
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275
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276 while (avpriv_atomic_ptr_cas((void * volatile *)&pool->pool, NULL, buf)) {
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277 /* pool is not empty, retrieve it and append it to our list */
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278 cur = get_pool(pool);
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279 end->next = cur;
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280 while (end->next)
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281 end = end->next;
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282 }
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283 }
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284
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285 static void pool_release_buffer(void *opaque, uint8_t *data)
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286 {
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287 BufferPoolEntry *buf = opaque;
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288 AVBufferPool *pool = buf->pool;
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289
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290 if(CONFIG_MEMORY_POISONING)
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291 memset(buf->data, FF_MEMORY_POISON, pool->size);
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292
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293 add_to_pool(buf);
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294 if (!avpriv_atomic_int_add_and_fetch(&pool->refcount, -1))
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295 buffer_pool_free(pool);
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296 }
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297
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298 /* allocate a new buffer and override its free() callback so that
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299 * it is returned to the pool on free */
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300 static AVBufferRef *pool_alloc_buffer(AVBufferPool *pool)
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301 {
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302 BufferPoolEntry *buf;
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303 AVBufferRef *ret;
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304
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305 ret = pool->alloc(pool->size);
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306 if (!ret)
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307 return NULL;
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308
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309 buf = av_mallocz(sizeof(*buf));
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310 if (!buf) {
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311 av_buffer_unref(&ret);
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312 return NULL;
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313 }
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314
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315 buf->data = ret->buffer->data;
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316 buf->opaque = ret->buffer->opaque;
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317 buf->free = ret->buffer->free;
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318 buf->pool = pool;
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319
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320 ret->buffer->opaque = buf;
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321 ret->buffer->free = pool_release_buffer;
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322
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323 avpriv_atomic_int_add_and_fetch(&pool->refcount, 1);
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324 avpriv_atomic_int_add_and_fetch(&pool->nb_allocated, 1);
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325
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326 return ret;
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327 }
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328
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329 AVBufferRef *av_buffer_pool_get(AVBufferPool *pool)
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330 {
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331 AVBufferRef *ret;
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332 BufferPoolEntry *buf;
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333
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334 /* check whether the pool is empty */
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335 buf = get_pool(pool);
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336 if (!buf && pool->refcount <= pool->nb_allocated) {
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337 av_log(NULL, AV_LOG_DEBUG, "Pool race dectected, spining to avoid overallocation and eventual OOM\n");
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338 while (!buf && avpriv_atomic_int_get(&pool->refcount) <= avpriv_atomic_int_get(&pool->nb_allocated))
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339 buf = get_pool(pool);
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340 }
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341
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342 if (!buf)
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343 return pool_alloc_buffer(pool);
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344
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345 /* keep the first entry, return the rest of the list to the pool */
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346 add_to_pool(buf->next);
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347 buf->next = NULL;
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348
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349 ret = av_buffer_create(buf->data, pool->size, pool_release_buffer,
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350 buf, 0);
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351 if (!ret) {
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352 add_to_pool(buf);
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353 return NULL;
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354 }
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355 avpriv_atomic_int_add_and_fetch(&pool->refcount, 1);
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356
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357 return ret;
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358 }
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