1 | /* |
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2 | * ====================================================================== |
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3 | * Rappture::MediaPlayer |
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4 | * |
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5 | * AUTHOR: Derrick Kearney, Purdue University |
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6 | * |
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7 | * Copyright (c) 2004-2012 HUBzero Foundation, LLC |
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8 | * ---------------------------------------------------------------------- |
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9 | * See the file "license.terms" for information on usage and |
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10 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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11 | * ====================================================================== |
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12 | */ |
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13 | |
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14 | #include <cstdlib> |
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15 | #include <cstdio> |
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16 | #include <cstring> |
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17 | #include <cmath> |
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18 | #include <fstream> |
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19 | #include <assert.h> |
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20 | |
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21 | #include "RpMediaPlayer.h" |
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22 | |
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23 | using namespace Rappture; |
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24 | |
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25 | MediaPlayer::MediaPlayer() : |
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26 | _width (0), |
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27 | _height (0), |
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28 | _bitRate(400000), |
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29 | _frameRate(25.0f), |
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30 | _pFormatCtx(NULL), |
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31 | _videoStream(-1), |
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32 | _pCodecCtx(NULL), |
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33 | _pCodec(NULL), |
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34 | _pFrame(NULL), |
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35 | _pFrameRGB(NULL), |
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36 | _packet(), |
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37 | _buffer(NULL), |
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38 | _swsctx(NULL) |
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39 | { |
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40 | } |
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41 | |
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42 | /** |
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43 | * Copy constructor |
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44 | * @param MediaPlayer object to copy |
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45 | */ |
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46 | /* |
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47 | MediaPlayer::MediaPlayer(const MediaPlayer& o) |
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48 | {} |
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49 | */ |
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50 | |
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51 | MediaPlayer::~MediaPlayer() |
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52 | { |
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53 | // release(); |
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54 | } |
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55 | |
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56 | |
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57 | bool |
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58 | MediaPlayer::init(Outcome &status, const char *filename) |
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59 | { |
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60 | status.addContext("Rappture::MediaPlayer::init()"); |
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61 | |
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62 | /* Register all codecs and formats */ |
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63 | av_register_all(); |
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64 | return load(status, filename); |
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65 | } |
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66 | |
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67 | bool |
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68 | MediaPlayer::load(Outcome &status, const char *filename) |
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69 | { |
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70 | status.addContext("Rappture::MediaPlayer::load()"); |
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71 | |
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72 | // Open video file |
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73 | if(av_open_input_file(&_pFormatCtx, filename, NULL, 0, NULL)!=0) { |
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74 | status.addError("Could not open file"); |
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75 | return false; |
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76 | } |
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77 | |
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78 | // Retrieve stream information |
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79 | if(av_find_stream_info(_pFormatCtx)<0) { |
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80 | status.addError("Could not find stream information"); |
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81 | return false; |
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82 | } |
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83 | |
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84 | // Dump information about file onto standard error |
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85 | dump_format(_pFormatCtx, 0, filename, 0); |
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86 | |
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87 | // Find the first video stream |
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88 | _videoStream=-1; |
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89 | for(size_t i=0; i<_pFormatCtx->nb_streams; i++) { |
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90 | if(_pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO) { |
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91 | _videoStream=i; |
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92 | break; |
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93 | } |
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94 | } |
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95 | |
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96 | if(_videoStream==-1) { |
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97 | status.addError("Did not find a video stream"); |
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98 | return false; |
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99 | } |
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100 | |
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101 | // Get a pointer to the codec context for the video stream |
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102 | _pCodecCtx=_pFormatCtx->streams[_videoStream]->codec; |
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103 | |
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104 | // Find the decoder for the video stream |
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105 | _pCodec=avcodec_find_decoder(_pCodecCtx->codec_id); |
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106 | if(_pCodec==NULL) { |
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107 | status.addError("Unsupported codec"); |
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108 | return false; |
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109 | } |
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110 | |
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111 | // Open codec |
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112 | if(avcodec_open(_pCodecCtx, _pCodec)<0) { |
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113 | status.addError("Could not open codec"); |
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114 | return false; |
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115 | } |
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116 | |
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117 | // Allocate video frame |
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118 | _pFrame=avcodec_alloc_frame(); |
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119 | |
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120 | // Allocate an AVFrame structure |
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121 | _pFrameRGB=avcodec_alloc_frame(); |
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122 | if(_pFrameRGB==NULL) { |
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123 | status.addError("Failed to allocate avcodec frame"); |
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124 | return false; |
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125 | } |
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126 | |
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127 | // Determine required buffer size and allocate buffer |
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128 | int numBytes=avpicture_get_size(PIX_FMT_RGB24, _pCodecCtx->width, |
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129 | _pCodecCtx->height); |
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130 | _buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t)); |
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131 | |
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132 | // Assign appropriate parts of buffer to image planes in pFrameRGB |
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133 | avpicture_fill((AVPicture *)_pFrameRGB, _buffer, PIX_FMT_RGB24, |
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134 | _pCodecCtx->width, _pCodecCtx->height); |
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135 | |
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136 | /* setup sws context */ |
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137 | if (_swsctx == NULL) { |
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138 | _swsctx = sws_getContext(_pCodecCtx->width, _pCodecCtx->height, |
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139 | _pCodecCtx->pix_fmt, _pCodecCtx->width, |
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140 | _pCodecCtx->height, PIX_FMT_RGB24, |
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141 | SWS_BILINEAR, NULL, NULL, NULL); |
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142 | if (_swsctx == NULL) { |
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143 | status.addError("Cannot initialize the conversion context"); |
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144 | return false; |
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145 | } |
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146 | } |
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147 | |
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148 | return true; |
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149 | } |
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150 | |
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151 | |
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152 | bool |
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153 | MediaPlayer::release() |
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154 | { |
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155 | // status.addContext("Rappture::MediaPlayer::release()"); |
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156 | |
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157 | // Free the RGB image |
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158 | if (_buffer) { |
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159 | av_free(_buffer); |
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160 | _buffer = NULL; |
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161 | } |
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162 | |
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163 | if (_pFrameRGB) { |
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164 | av_free(_pFrameRGB); |
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165 | _pFrameRGB = NULL; |
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166 | } |
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167 | |
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168 | // Free the YUV frame |
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169 | if (_pFrame) { |
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170 | av_free(_pFrame); |
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171 | _pFrame = NULL; |
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172 | } |
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173 | |
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174 | // Close the codec |
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175 | if (_pCodecCtx) { |
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176 | avcodec_close(_pCodecCtx); |
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177 | _pCodecCtx = NULL; |
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178 | } |
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179 | |
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180 | // Close the video file |
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181 | if (_pFormatCtx) { |
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182 | av_close_input_file(_pFormatCtx); |
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183 | _pFormatCtx = NULL; |
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184 | } |
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185 | |
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186 | return true; |
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187 | } |
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188 | |
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189 | size_t |
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190 | MediaPlayer::read(Outcome &status, SimpleCharBuffer *b) |
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191 | { |
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192 | status.addContext("Rappture::MediaPlayer::read()"); |
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193 | |
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194 | int frameFinished = 0; |
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195 | |
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196 | while(av_read_frame(_pFormatCtx, &_packet)>=0) { |
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197 | // Is this a packet from the video stream? |
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198 | if(_packet.stream_index==_videoStream) { |
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199 | // Decode video frame |
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200 | avcodec_decode_video2(_pCodecCtx, _pFrame, &frameFinished, |
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201 | &_packet); |
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202 | |
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203 | // Did we get a video frame? |
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204 | if (frameFinished) { |
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205 | // Convert the image from its native format to RGB |
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206 | sws_scale(_swsctx, |
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207 | (const uint8_t * const*)_pFrame->data, |
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208 | _pFrame->linesize, 0, _pCodecCtx->height, |
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209 | _pFrameRGB->data, _pFrameRGB->linesize); |
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210 | |
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211 | __frame2ppm(b); |
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212 | break; |
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213 | } |
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214 | } |
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215 | |
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216 | // Free the packet that was allocated by av_read_frame |
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217 | av_free_packet(&_packet); |
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218 | } |
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219 | return 1; |
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220 | } |
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221 | |
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222 | size_t |
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223 | MediaPlayer::nframes() const |
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224 | { |
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225 | // status.addContext("Rappture::MediaPlayer::nframes()"); |
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226 | return 0; |
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227 | } |
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228 | /* |
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229 | int packet_queue_put(PacketQueue *q, AVPacket *pkt) { |
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230 | |
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231 | AVPacketList *pkt1; |
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232 | if(pkt != &flush_pkt && av_dup_packet(pkt) < 0) { |
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233 | return -1; |
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234 | } |
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235 | if(packet_queue_get(&is->audioq, pkt, 1) < 0) { |
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236 | return -1; |
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237 | } |
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238 | if(packet->data == flush_pkt.data) { |
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239 | avcodec_flush_buffers(is->audio_st->codec); |
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240 | continue; |
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241 | } |
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242 | */ |
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243 | |
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244 | |
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245 | int |
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246 | MediaPlayer::seek(long offset, int whence) |
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247 | { |
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248 | // status.addContext("Rappture::MediaPlayer::seek()"); |
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249 | int stream_index= -1; |
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250 | int64_t seek_target = is->seek_pos; |
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251 | |
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252 | if (is->videoStream >= 0) { |
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253 | stream_index = is->videoStream; |
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254 | } else if (is->audioStream >= 0) { |
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255 | stream_index = is->audioStream; |
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256 | } |
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257 | |
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258 | if(stream_index>=0){ |
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259 | seek_target= av_rescale_q(seek_target, AV_TIME_BASE_Q, |
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260 | pFormatCtx->streams[stream_index]->time_base); |
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261 | } |
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262 | if(av_seek_frame(is->pFormatCtx, stream_index, |
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263 | seek_target, is->seek_flags) < 0) { |
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264 | fprintf(stderr, "%s: error while seeking\n", |
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265 | is->pFormatCtx->filename); |
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266 | } else { |
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267 | /* handle packet queues... more later... */ |
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268 | if(is->audioStream >= 0) { |
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269 | packet_queue_flush(&is->audioq); |
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270 | packet_queue_put(&is->audioq, &flush_pkt); |
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271 | } |
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272 | if(is->videoStream >= 0) { |
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273 | packet_queue_flush(&is->videoq); |
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274 | packet_queue_put(&is->videoq, &flush_pkt); |
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275 | } |
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276 | } |
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277 | is->seek_req = 0; |
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278 | return 0; |
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279 | } |
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280 | |
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281 | int |
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282 | MediaPlayer::tell() const |
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283 | { |
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284 | // status.addContext("Rappture::MediaPlayer::tell()"); |
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285 | return 0; |
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286 | } |
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287 | |
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288 | size_t |
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289 | MediaPlayer::set(size_t nframes) |
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290 | { |
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291 | // status.addContext("Rappture::MediaPlayer::set()"); |
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292 | return 0; |
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293 | } |
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294 | |
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295 | bool |
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296 | MediaPlayer::good() const |
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297 | { |
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298 | // status.addContext("Rappture::MediaPlayer::good()"); |
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299 | return true; |
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300 | } |
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301 | |
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302 | bool |
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303 | MediaPlayer::bad() const |
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304 | { |
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305 | // status.addContext("Rappture::MediaPlayer::bad()"); |
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306 | return false; |
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307 | } |
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308 | |
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309 | bool |
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310 | MediaPlayer::eof() const |
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311 | { |
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312 | // status.addContext("Rappture::MediaPlayer::eof()"); |
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313 | return false; |
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314 | } |
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315 | |
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316 | void |
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317 | MediaPlayer::__frame2ppm(SimpleCharBuffer *b) |
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318 | { |
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319 | // status.addContext("Rappture::MediaPlayer::__frame2ppm()"); |
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320 | |
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321 | // FIXME: look into using rewind or some other method that |
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322 | // does not free the already allocated memory. just |
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323 | // reuses the block. |
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324 | b->clear(); |
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325 | |
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326 | // Write header |
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327 | b->appendf("P6\n%d %d\n255\n", _pCodecCtx->width, _pCodecCtx->height); |
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328 | |
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329 | // Write pixel data |
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330 | for(int y=0; y<_pCodecCtx->height; y++) { |
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331 | // really want to store a void*... |
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332 | b->append((const char *)(_pFrameRGB->data[0]+y*_pFrameRGB->linesize[0]), _pCodecCtx->width*3); |
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333 | } |
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334 | } |
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