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1 /* GStreamer |
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2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
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3 * 2000 Wim Taymans <wtay@chello.be> |
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4 * |
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5 * gstbuffer.h: Header for GstBuffer object |
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6 * |
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7 * This library is free software; you can redistribute it and/or |
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8 * modify it under the terms of the GNU Library General Public |
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9 * License as published by the Free Software Foundation; either |
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10 * version 2 of the License, or (at your option) any later version. |
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11 * |
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12 * This library is distributed in the hope that it will be useful, |
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 * Library General Public License for more details. |
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16 * |
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17 * You should have received a copy of the GNU Library General Public |
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18 * License along with this library; if not, write to the |
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19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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20 * Boston, MA 02111-1307, USA. |
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21 */ |
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22 |
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23 |
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24 #ifndef __GST_BUFFER_H__ |
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25 #define __GST_BUFFER_H__ |
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26 |
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27 #include <gst/gstminiobject.h> |
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28 #include <gst/gstclock.h> |
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29 #include <gst/gstcaps.h> |
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30 |
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31 G_BEGIN_DECLS |
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32 |
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33 typedef struct _GstBuffer GstBuffer; |
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34 typedef struct _GstBufferClass GstBufferClass; |
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35 |
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36 /** |
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37 * GST_BUFFER_TRACE_NAME: |
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38 * |
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39 * The name used for tracing memory allocations. |
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40 */ |
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41 #define GST_BUFFER_TRACE_NAME "GstBuffer" |
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42 |
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43 #define GST_TYPE_BUFFER (gst_buffer_get_type()) |
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44 #define GST_IS_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BUFFER)) |
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45 #define GST_IS_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BUFFER)) |
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46 #define GST_BUFFER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BUFFER, GstBufferClass)) |
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47 #define GST_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BUFFER, GstBuffer)) |
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48 #define GST_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BUFFER, GstBufferClass)) |
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49 #define GST_BUFFER_CAST(obj) ((GstBuffer *)(obj)) |
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50 |
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51 /** |
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52 * GST_BUFFER_FLAGS: |
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53 * @buf: a #GstBuffer. |
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54 * |
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55 * A flags word containing #GstBufferFlag flags set on this buffer. |
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56 */ |
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57 #define GST_BUFFER_FLAGS(buf) GST_MINI_OBJECT_FLAGS(buf) |
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58 /** |
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59 * GST_BUFFER_FLAG_IS_SET: |
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60 * @buf: a #GstBuffer. |
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61 * @flag: the #GstBufferFlag to check. |
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62 * |
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63 * Gives the status of a specific flag on a buffer. |
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64 */ |
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65 #define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_MINI_OBJECT_FLAG_IS_SET (buf, flag) |
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66 /** |
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67 * GST_BUFFER_FLAG_SET: |
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68 * @buf: a #GstBuffer. |
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69 * @flag: the #GstBufferFlag to set. |
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70 * |
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71 * Sets a buffer flag on a buffer. |
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72 */ |
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73 #define GST_BUFFER_FLAG_SET(buf,flag) GST_MINI_OBJECT_FLAG_SET (buf, flag) |
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74 /** |
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75 * GST_BUFFER_FLAG_UNSET: |
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76 * @buf: a #GstBuffer. |
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77 * @flag: the #GstBufferFlag to clear. |
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78 * |
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79 * Clears a buffer flag. |
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80 */ |
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81 #define GST_BUFFER_FLAG_UNSET(buf,flag) GST_MINI_OBJECT_FLAG_UNSET (buf, flag) |
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82 |
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83 /** |
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84 * GST_BUFFER_DATA: |
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85 * @buf: a #GstBuffer. |
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86 * |
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87 * A pointer to the data element of this buffer. |
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88 */ |
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89 #define GST_BUFFER_DATA(buf) (GST_BUFFER_CAST(buf)->data) |
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90 /** |
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91 * GST_BUFFER_SIZE: |
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92 * @buf: a #GstBuffer. |
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93 * |
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94 * The size in bytes of the data in this buffer. |
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95 */ |
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96 #define GST_BUFFER_SIZE(buf) (GST_BUFFER_CAST(buf)->size) |
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97 /** |
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98 * GST_BUFFER_TIMESTAMP: |
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99 * @buf: a #GstBuffer.: |
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100 * |
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101 * The timestamp in nanoseconds (as a #GstClockTime) of the data in the buffer. |
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102 * Value will be %GST_CLOCK_TIME_NONE if the timestamp is unknown. |
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103 * |
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104 */ |
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105 #define GST_BUFFER_TIMESTAMP(buf) (GST_BUFFER_CAST(buf)->timestamp) |
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106 /** |
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107 * GST_BUFFER_DURATION: |
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108 * @buf: a #GstBuffer. |
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109 * |
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110 * The duration in nanoseconds (as a #GstClockTime) of the data in the buffer. |
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111 * Value will be %GST_CLOCK_TIME_NONE if the duration is unknown. |
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112 */ |
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113 #define GST_BUFFER_DURATION(buf) (GST_BUFFER_CAST(buf)->duration) |
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114 /** |
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115 * GST_BUFFER_CAPS: |
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116 * @buf: a #GstBuffer. |
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117 * |
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118 * The caps for this buffer. |
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119 */ |
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120 #define GST_BUFFER_CAPS(buf) (GST_BUFFER_CAST(buf)->caps) |
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121 /** |
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122 * GST_BUFFER_OFFSET: |
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123 * @buf: a #GstBuffer. |
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124 * |
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125 * The offset in the source file of the beginning of this buffer. |
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126 */ |
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127 #define GST_BUFFER_OFFSET(buf) (GST_BUFFER_CAST(buf)->offset) |
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128 /** |
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129 * GST_BUFFER_OFFSET_END: |
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130 * @buf: a #GstBuffer. |
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131 * |
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132 * The offset in the source file of the end of this buffer. |
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133 */ |
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134 #define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER_CAST(buf)->offset_end) |
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135 /** |
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136 * GST_BUFFER_MALLOCDATA: |
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137 * @buf: a #GstBuffer. |
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138 * |
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139 * A pointer to any data allocated for this buffer using g_malloc(). If this is |
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140 * non-NULL, this memory will be freed at the end of the buffer's lifecycle |
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141 * (i.e. when its refcount becomes zero). |
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142 */ |
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143 #define GST_BUFFER_MALLOCDATA(buf) (GST_BUFFER_CAST(buf)->malloc_data) |
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144 |
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145 /** |
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146 * GST_BUFFER_OFFSET_NONE: |
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147 * |
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148 * Constant for no-offset return results. |
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149 */ |
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150 #define GST_BUFFER_OFFSET_NONE ((guint64)-1) |
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151 |
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152 /** |
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153 * GST_BUFFER_DURATION_IS_VALID: |
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154 * @buffer: a #GstBuffer |
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155 * |
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156 * Tests if the duration is known. |
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157 */ |
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158 #define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer))) |
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159 /** |
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160 * GST_BUFFER_TIMESTAMP_IS_VALID: |
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161 * @buffer: a #GstBuffer |
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162 * |
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163 * Tests if the timestamp is known. |
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164 */ |
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165 #define GST_BUFFER_TIMESTAMP_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buffer))) |
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166 /** |
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167 * GST_BUFFER_OFFSET_IS_VALID: |
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168 * @buffer: a #GstBuffer |
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169 * |
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170 * Tests if the start offset is known. |
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171 */ |
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172 #define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE) |
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173 /** |
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174 * GST_BUFFER_OFFSET_END_IS_VALID: |
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175 * @buffer: a #GstBuffer |
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176 * |
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177 * Tests if the end offset is known. |
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178 */ |
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179 #define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE) |
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180 /** |
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181 * GST_BUFFER_IS_DISCONT: |
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182 * @buffer: a #GstBuffer |
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183 * |
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184 * Tests if the buffer marks a discontinuity in the stream. |
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185 * |
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186 * Since: 0.10.9 |
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187 */ |
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188 #define GST_BUFFER_IS_DISCONT(buffer) (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) |
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189 |
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190 /** |
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191 * GstBufferFlag: |
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192 * @GST_BUFFER_FLAG_READONLY: the buffer is read-only. This means the data of |
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193 * the buffer should not be modified. The metadata might still be modified. |
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194 * @GST_BUFFER_FLAG_PREROLL: the buffer is part of a preroll and should not be |
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195 * displayed. |
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196 * @GST_BUFFER_FLAG_DISCONT: the buffer marks a discontinuity in the stream. |
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197 * This typically occurs after a seek or a dropped buffer from a live or |
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198 * network source. |
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199 * @GST_BUFFER_FLAG_IN_CAPS: the buffer has been added as a field in a #GstCaps. |
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200 * @GST_BUFFER_FLAG_GAP: the buffer has been created to fill a gap in the |
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201 * stream and contains media neutral data (elements can switch to optimized code |
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202 * path that ignores the buffer content). |
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203 * @GST_BUFFER_FLAG_DELTA_UNIT: this unit cannot be decoded independently. |
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204 * @GST_BUFFER_FLAG_LAST: additional flags can be added starting from this flag. |
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205 * |
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206 * A set of buffer flags used to describe properties of a #GstBuffer. |
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207 */ |
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208 typedef enum { |
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209 GST_BUFFER_FLAG_READONLY = GST_MINI_OBJECT_FLAG_READONLY, |
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210 GST_BUFFER_FLAG_PREROLL = (GST_MINI_OBJECT_FLAG_LAST << 0), |
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211 GST_BUFFER_FLAG_DISCONT = (GST_MINI_OBJECT_FLAG_LAST << 1), |
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212 GST_BUFFER_FLAG_IN_CAPS = (GST_MINI_OBJECT_FLAG_LAST << 2), |
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213 GST_BUFFER_FLAG_GAP = (GST_MINI_OBJECT_FLAG_LAST << 3), |
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214 GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 4), |
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215 /* padding */ |
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216 GST_BUFFER_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 8) |
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217 } GstBufferFlag; |
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218 |
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219 /** |
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220 * GstBuffer: |
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221 * @mini_object: the parent structure |
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222 * @data: pointer to the buffer data |
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223 * @size: size of buffer data |
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224 * @timestamp: timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the |
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225 * timestamp is not known or relevant. |
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226 * @duration: duration in time of the buffer data, can be #GST_CLOCK_TIME_NONE |
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227 * when the duration is not known or relevant. |
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228 * @caps: the #GstCaps describing the data format in this buffer |
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229 * @offset: a media specific offset for the buffer data. |
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230 * For video frames, this is the frame number of this buffer. |
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231 * For audio samples, this is the offset of the first sample in this buffer. |
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232 * For file data or compressed data this is the byte offset of the first |
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233 * byte in this buffer. |
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234 * @offset_end: the last offset contained in this buffer. It has the same |
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235 * format as @offset. |
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236 * @malloc_data: a pointer to the allocated memory associated with this buffer. |
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237 * When the buffer is freed, this data will freed with g_free(). |
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238 * |
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239 * The structure of a #GstBuffer. Use the associated macros to access the public |
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240 * variables. |
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241 */ |
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242 struct _GstBuffer { |
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243 GstMiniObject mini_object; |
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244 |
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245 /*< public >*/ /* with COW */ |
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246 /* pointer to data and its size */ |
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247 guint8 *data; |
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248 guint size; |
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249 |
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250 /* timestamp */ |
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251 GstClockTime timestamp; |
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252 GstClockTime duration; |
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253 |
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254 /* the media type of this buffer */ |
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255 GstCaps *caps; |
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256 |
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257 /* media specific offset */ |
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258 guint64 offset; |
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259 guint64 offset_end; |
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260 |
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261 guint8 *malloc_data; |
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262 |
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263 /*< private >*/ |
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264 gpointer _gst_reserved[GST_PADDING]; |
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265 }; |
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266 |
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267 struct _GstBufferClass { |
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268 GstMiniObjectClass mini_object_class; |
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269 }; |
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270 #ifdef __SYMBIAN32__ |
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271 IMPORT_C |
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272 #endif |
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273 |
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274 |
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275 GType gst_buffer_get_type (void); |
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276 |
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277 /* allocation */ |
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278 #ifdef __SYMBIAN32__ |
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279 IMPORT_C |
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280 #endif |
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281 |
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282 GstBuffer * gst_buffer_new (void); |
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283 #ifdef __SYMBIAN32__ |
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284 IMPORT_C |
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285 #endif |
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286 |
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287 GstBuffer * gst_buffer_new_and_alloc (guint size); |
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288 #ifdef __SYMBIAN32__ |
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289 IMPORT_C |
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290 #endif |
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291 |
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292 GstBuffer * gst_buffer_try_new_and_alloc (guint size); |
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293 |
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294 /** |
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295 * gst_buffer_set_data: |
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296 * @buf: a #GstBuffer |
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297 * @data: The data (a #guint8 *) to set on the buffer. |
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298 * @size: The size (in bytes, as a #guint) of the data being set. |
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299 * |
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300 * A convenience function to set the data and size on a buffer. |
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301 * This will replace any existing data pointer set on this buffer, but will |
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302 * not change GST_BUFFER_MALLOCDATA(), if any. Callers should ensure that |
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303 * GST_BUFFER_MALLOCDATA() is non-NULL, or should free that and set it to NULL. |
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304 * |
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305 * No checks are done on the data or size arguments passed. |
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306 */ |
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307 #define gst_buffer_set_data(buf, data, size) \ |
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308 G_STMT_START { \ |
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309 GST_BUFFER_DATA (buf) = data; \ |
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310 GST_BUFFER_SIZE (buf) = size; \ |
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311 } G_STMT_END |
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312 |
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313 /* refcounting */ |
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314 /** |
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315 * gst_buffer_ref: |
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316 * @buf: a #GstBuffer. |
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317 * |
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318 * Increases the refcount of the given buffer by one. |
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319 * |
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320 * Note that the refcount affects the writeability |
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321 * of @buf and its metadata, see gst_buffer_is_writable() and |
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322 * gst_buffer_is_metadata_writable(). It is |
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323 * important to note that keeping additional references to |
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324 * GstBuffer instances can potentially increase the number |
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325 * of memcpy operations in a pipeline. |
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326 * |
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327 * Returns: @buf |
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328 */ |
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329 #ifdef _FOOL_GTK_DOC_ |
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330 G_INLINE_FUNC GstBuffer * gst_buffer_ref (GstBuffer * buf); |
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331 #endif |
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332 |
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333 static inline GstBuffer * |
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334 gst_buffer_ref (GstBuffer * buf) |
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335 { |
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336 /* not using a macro here because gcc-4.1 will complain |
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337 * if the return value isn't used (because of the cast) */ |
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338 return (GstBuffer *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (buf)); |
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339 } |
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340 |
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341 /** |
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342 * gst_buffer_unref: |
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343 * @buf: a #GstBuffer. |
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344 * |
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345 * Decreases the refcount of the buffer. If the refcount reaches 0, the buffer |
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346 * will be freed. If GST_BUFFER_MALLOCDATA() is non-NULL, this pointer will |
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347 * also be freed at this time. |
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348 */ |
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349 #define gst_buffer_unref(buf) gst_mini_object_unref (GST_MINI_OBJECT_CAST (buf)) |
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350 |
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351 /* copy buffer */ |
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352 /** |
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353 * gst_buffer_copy: |
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354 * @buf: a #GstBuffer. |
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355 * |
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356 * Create a copy of the given buffer. This will also make a newly allocated |
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357 * copy of the data the source buffer contains. |
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358 */ |
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359 #define gst_buffer_copy(buf) GST_BUFFER_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CAST (buf))) |
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360 |
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361 /** |
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362 * GstBufferCopyFlags: |
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363 * @GST_BUFFER_COPY_FLAGS: flag indicating that buffer flags should be copied |
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364 * @GST_BUFFER_COPY_TIMESTAMPS: flag indicating that buffer timestamp, duration, |
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365 * offset and offset_end should be copied |
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366 * @GST_BUFFER_COPY_CAPS: flag indicating that buffer caps should be copied |
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367 * |
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368 * A set of flags that can be provided to the gst_buffer_copy_metadata() |
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369 * function to specify which metadata fields should be copied. |
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370 * |
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371 * Since: 0.10.13 |
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372 */ |
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373 typedef enum { |
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374 GST_BUFFER_COPY_FLAGS = (1 << 0), |
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375 GST_BUFFER_COPY_TIMESTAMPS = (1 << 1), |
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376 GST_BUFFER_COPY_CAPS = (1 << 2) |
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377 } GstBufferCopyFlags; |
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378 |
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379 /** |
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380 * GST_BUFFER_COPY_ALL: |
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381 * |
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382 * Combination of all possible fields that can be copied with |
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383 * gst_buffer_copy_metadata(). |
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384 * |
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385 * Since: 0.10.13 |
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386 */ |
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387 #define GST_BUFFER_COPY_ALL (GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_CAPS) |
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388 |
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389 /* copies metadata into newly allocated buffer */ |
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390 #ifdef __SYMBIAN32__ |
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391 IMPORT_C |
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392 #endif |
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393 |
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394 void gst_buffer_copy_metadata (GstBuffer *dest, const GstBuffer *src, |
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395 GstBufferCopyFlags flags); |
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396 |
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397 /** |
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398 * gst_buffer_is_writable: |
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399 * @buf: a #GstBuffer |
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400 * |
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401 * Tests if you can safely write data into a buffer's data array or validly |
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402 * modify the caps and timestamp metadata. Metadata in a GstBuffer is always |
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403 * writable, but it is only safe to change it when there is only one owner |
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404 * of the buffer - ie, the refcount is 1. |
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405 */ |
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406 #define gst_buffer_is_writable(buf) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (buf)) |
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407 /** |
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408 * gst_buffer_make_writable: |
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409 * @buf: a #GstBuffer |
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410 * |
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411 * Makes a writable buffer from the given buffer. If the source buffer is |
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412 * already writable, this will simply return the same buffer. A copy will |
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413 * otherwise be made using gst_buffer_copy(). |
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414 */ |
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415 #define gst_buffer_make_writable(buf) GST_BUFFER_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (buf))) |
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416 |
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417 /* Ensure that the metadata of the buffer is writable, even if the buffer data |
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418 * isn't */ |
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419 #ifdef __SYMBIAN32__ |
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420 IMPORT_C |
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421 #endif |
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422 |
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423 gboolean gst_buffer_is_metadata_writable (GstBuffer *buf); |
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424 #ifdef __SYMBIAN32__ |
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425 IMPORT_C |
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426 #endif |
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427 |
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428 GstBuffer* gst_buffer_make_metadata_writable (GstBuffer *buf); |
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429 |
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430 /** |
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431 * gst_buffer_replace: |
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432 * @obuf: pointer to a pointer to a #GstBuffer to be replaced. |
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433 * @nbuf: pointer to a #GstBuffer that will replace the buffer pointed to by |
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434 * @obuf. |
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435 * |
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436 * Modifies a pointer to a #Gstbuffer to point to a different #GstBuffer. The |
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437 * modification is done atomically (so this is useful for ensuring thread safety |
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438 * in some cases), and the reference counts are updated appropriately (the old |
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439 * buffer is unreffed, the new is reffed). |
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440 * |
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441 * Either @nbuf or the #GstBuffer pointed to by @obuf may be NULL. |
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442 */ |
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443 #define gst_buffer_replace(obuf,nbuf) \ |
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444 G_STMT_START { \ |
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445 GstBuffer **___obufaddr = (GstBuffer **)(obuf); \ |
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446 gst_mini_object_replace ((GstMiniObject **)___obufaddr, \ |
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447 GST_MINI_OBJECT_CAST (nbuf)); \ |
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448 } G_STMT_END |
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449 #ifdef __SYMBIAN32__ |
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450 IMPORT_C |
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451 #endif |
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452 |
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453 |
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454 GstCaps* gst_buffer_get_caps (GstBuffer *buffer); |
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455 #ifdef __SYMBIAN32__ |
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456 IMPORT_C |
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457 #endif |
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458 |
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459 void gst_buffer_set_caps (GstBuffer *buffer, GstCaps *caps); |
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460 |
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461 /* creating a subbuffer */ |
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462 #ifdef __SYMBIAN32__ |
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463 IMPORT_C |
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464 #endif |
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465 |
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466 GstBuffer* gst_buffer_create_sub (GstBuffer *parent, guint offset, guint size); |
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467 |
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468 /* span, two buffers, intelligently */ |
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469 #ifdef __SYMBIAN32__ |
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470 IMPORT_C |
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471 #endif |
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472 |
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473 gboolean gst_buffer_is_span_fast (GstBuffer *buf1, GstBuffer *buf2); |
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474 #ifdef __SYMBIAN32__ |
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475 IMPORT_C |
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476 #endif |
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477 |
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478 GstBuffer* gst_buffer_span (GstBuffer *buf1, guint32 offset, GstBuffer *buf2, guint32 len); |
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479 |
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480 /** |
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481 * gst_value_set_buffer: |
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482 * @v: a #GstValue to receive the data |
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483 * @b: a #GstBuffer to assign to the GstValue |
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484 * |
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485 * Sets @b as the value of @v. Caller retains reference to buffer. |
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486 */ |
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487 #define gst_value_set_buffer(v,b) gst_value_set_mini_object(v, GST_MINI_OBJECT_CAST(b)) |
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488 /** |
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489 * gst_value_take_buffer: |
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490 * @v: a #GstValue to receive the data |
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491 * @b: a #GstBuffer to assign to the GstValue |
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492 * |
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493 * Sets @b as the value of @v. Caller gives away reference to buffer. |
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494 */ |
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495 #define gst_value_take_buffer(v,b) gst_value_take_mini_object(v, GST_MINI_OBJECT_CAST(b)) |
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496 /** |
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497 * gst_value_get_buffer: |
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498 * @v: a #GstValue to qeury |
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499 * |
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500 * Receives a #GstBuffer as the value of @v. Does not return a reference to |
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501 * the buffer, so the pointer is only valid for as long as the caller owns |
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502 * a reference to @v. |
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503 */ |
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504 #define gst_value_get_buffer(v) GST_BUFFER_CAST (gst_value_get_mini_object(v)) |
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505 |
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506 G_END_DECLS |
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507 |
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508 #endif /* __GST_BUFFER_H__ */ |