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4349 | Serge | 1 | /* |
2 | * Copyright (c) 2008 Alexander Strange |
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3 | * |
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4 | * This file is part of FFmpeg. |
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5 | * |
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6 | * FFmpeg is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU Lesser General Public |
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8 | * License as published by the Free Software Foundation; either |
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9 | * version 2.1 of the License, or (at your option) any later version. |
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10 | * |
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11 | * FFmpeg is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | * Lesser General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU Lesser General Public |
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17 | * License along with FFmpeg; if not, write to the Free Software |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
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20 | |||
21 | /** |
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22 | * @file |
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23 | * Multithreading support functions |
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24 | * @author Alexander Strange |
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25 | */ |
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26 | |||
27 | #ifndef AVCODEC_THREAD_H |
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28 | #define AVCODEC_THREAD_H |
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29 | |||
30 | #include "libavutil/buffer.h" |
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31 | |||
32 | #include "config.h" |
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33 | #include "avcodec.h" |
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34 | |||
35 | typedef struct ThreadFrame { |
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36 | AVFrame *f; |
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37 | AVCodecContext *owner; |
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38 | // progress->data is an array of 2 ints holding progress for top/bottom |
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39 | // fields |
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40 | AVBufferRef *progress; |
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41 | } ThreadFrame; |
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42 | |||
43 | /** |
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44 | * Wait for decoding threads to finish and reset internal state. |
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45 | * Called by avcodec_flush_buffers(). |
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46 | * |
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47 | * @param avctx The context. |
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48 | */ |
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49 | void ff_thread_flush(AVCodecContext *avctx); |
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50 | |||
51 | /** |
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52 | * Submit a new frame to a decoding thread. |
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53 | * Returns the next available frame in picture. *got_picture_ptr |
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54 | * will be 0 if none is available. |
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55 | * The return value on success is the size of the consumed packet for |
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56 | * compatibility with avcodec_decode_video2(). This means the decoder |
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57 | * has to consume the full packet. |
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58 | * |
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59 | * Parameters are the same as avcodec_decode_video2(). |
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60 | */ |
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61 | int ff_thread_decode_frame(AVCodecContext *avctx, AVFrame *picture, |
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62 | int *got_picture_ptr, AVPacket *avpkt); |
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63 | |||
64 | /** |
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65 | * If the codec defines update_thread_context(), call this |
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66 | * when they are ready for the next thread to start decoding |
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67 | * the next frame. After calling it, do not change any variables |
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68 | * read by the update_thread_context() method, or call ff_thread_get_buffer(). |
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69 | * |
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70 | * @param avctx The context. |
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71 | */ |
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72 | void ff_thread_finish_setup(AVCodecContext *avctx); |
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73 | |||
74 | /** |
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75 | * Notify later decoding threads when part of their reference picture is ready. |
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76 | * Call this when some part of the picture is finished decoding. |
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77 | * Later calls with lower values of progress have no effect. |
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78 | * |
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79 | * @param f The picture being decoded. |
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80 | * @param progress Value, in arbitrary units, of how much of the picture has decoded. |
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81 | * @param field The field being decoded, for field-picture codecs. |
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82 | * 0 for top field or frame pictures, 1 for bottom field. |
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83 | */ |
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84 | void ff_thread_report_progress(ThreadFrame *f, int progress, int field); |
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85 | |||
86 | /** |
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87 | * Wait for earlier decoding threads to finish reference pictures. |
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88 | * Call this before accessing some part of a picture, with a given |
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89 | * value for progress, and it will return after the responsible decoding |
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90 | * thread calls ff_thread_report_progress() with the same or |
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91 | * higher value for progress. |
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92 | * |
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93 | * @param f The picture being referenced. |
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94 | * @param progress Value, in arbitrary units, to wait for. |
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95 | * @param field The field being referenced, for field-picture codecs. |
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96 | * 0 for top field or frame pictures, 1 for bottom field. |
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97 | */ |
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98 | void ff_thread_await_progress(ThreadFrame *f, int progress, int field); |
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99 | |||
100 | /** |
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101 | * Wrapper around get_format() for frame-multithreaded codecs. |
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102 | * Call this function instead of avctx->get_format(). |
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103 | * Cannot be called after the codec has called ff_thread_finish_setup(). |
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104 | * |
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105 | * @param avctx The current context. |
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106 | * @param fmt The list of available formats. |
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107 | */ |
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108 | enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt); |
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109 | |||
110 | /** |
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111 | * Wrapper around get_buffer() for frame-multithreaded codecs. |
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112 | * Call this function instead of ff_get_buffer(f). |
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113 | * Cannot be called after the codec has called ff_thread_finish_setup(). |
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114 | * |
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115 | * @param avctx The current context. |
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116 | * @param f The frame to write into. |
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117 | */ |
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118 | int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags); |
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119 | |||
120 | /** |
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121 | * Wrapper around release_buffer() frame-for multithreaded codecs. |
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122 | * Call this function instead of avctx->release_buffer(f). |
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123 | * The AVFrame will be copied and the actual release_buffer() call |
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124 | * will be performed later. The contents of data pointed to by the |
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125 | * AVFrame should not be changed until ff_thread_get_buffer() is called |
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126 | * on it. |
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127 | * |
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128 | * @param avctx The current context. |
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129 | * @param f The picture being released. |
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130 | */ |
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131 | void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f); |
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132 | |||
133 | int ff_thread_ref_frame(ThreadFrame *dst, ThreadFrame *src); |
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134 | |||
135 | int ff_thread_init(AVCodecContext *s); |
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136 | void ff_thread_free(AVCodecContext *s); |
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137 | |||
138 | int ff_alloc_entries(AVCodecContext *avctx, int count); |
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139 | void ff_reset_entries(AVCodecContext *avctx); |
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140 | void ff_thread_report_progress2(AVCodecContext *avctx, int field, int thread, int n); |
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141 | void ff_thread_await_progress2(AVCodecContext *avctx, int field, int thread, int shift); |
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142 | |||
143 | #endif /* AVCODEC_THREAD_H */ |