1 | // |
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2 | // moviemaker.cc |
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3 | // |
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4 | // Class for writing movies from Aven. |
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5 | // |
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6 | // Copyright (C) 2004 Olly Betts |
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7 | // |
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8 | // This program is free software; you can redistribute it and/or modify |
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9 | // it under the terms of the GNU General Public License as published by |
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10 | // the Free Software Foundation; either version 2 of the License, or |
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11 | // (at your option) any later version. |
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12 | // |
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13 | // This program is distributed in the hope that it will be useful, |
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14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | // GNU General Public License for more details. |
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17 | // |
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18 | // You should have received a copy of the GNU General Public License |
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19 | // along with this program; if not, write to the Free Software |
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20 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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21 | // |
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22 | |
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23 | #ifdef HAVE_CONFIG_H |
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24 | #include <config.h> |
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25 | #endif |
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26 | |
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27 | #include <assert.h> |
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28 | #include <stdlib.h> |
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29 | #include <string.h> |
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30 | |
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31 | #include "moviemaker.h" |
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32 | |
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33 | #ifdef HAVE_AVFORMAT_H |
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34 | #include "avformat.h" |
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35 | #endif |
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36 | |
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37 | // ffmpeg CVS has added av_alloc_format_context() - we're ready for it! |
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38 | #define av_alloc_format_context() \ |
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39 | ((AVFormatContext*)av_mallocz(sizeof(AVFormatContext))) |
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40 | |
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41 | const int OUTBUF_SIZE = 200000; |
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42 | |
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43 | MovieMaker::MovieMaker() |
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44 | : oc(0), st(0), frame(0), outbuf(0), in(0), out(0), pixels(0) |
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45 | { |
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46 | #ifdef HAVE_AVFORMAT_H |
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47 | static bool initialised_ffmpeg = false; |
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48 | if (initialised_ffmpeg) return; |
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49 | |
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50 | // FIXME: register only the codec(s) we want to use... |
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51 | av_register_all(); |
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52 | |
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53 | initialised_ffmpeg = true; |
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54 | #endif |
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55 | } |
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56 | |
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57 | bool MovieMaker::Open(const char *fnm, int width, int height) |
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58 | { |
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59 | #ifdef HAVE_AVFORMAT_H |
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60 | AVOutputFormat * fmt = guess_format(NULL, fnm, NULL); |
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61 | if (!fmt) { |
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62 | // We couldn't deduce the output format from file extension so default |
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63 | // to MPEG. |
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64 | fmt = guess_format("mpeg", NULL, NULL); |
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65 | if (!fmt) { |
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66 | // FIXME : error finding a format... |
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67 | return false; |
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68 | } |
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69 | } |
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70 | if (fmt->video_codec == CODEC_ID_NONE) { |
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71 | // FIXME : The user asked for a format which is audio-only! |
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72 | return false; |
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73 | } |
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74 | |
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75 | // Allocate the output media context. |
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76 | oc = av_alloc_format_context(); |
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77 | if (!oc) { |
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78 | // FIXME : out of memory |
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79 | return false; |
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80 | } |
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81 | oc->oformat = fmt; |
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82 | if (strlen(fnm) >= sizeof(oc->filename)) { |
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83 | // FIXME : filename too long |
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84 | return false; |
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85 | } |
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86 | strcpy(oc->filename, fnm); |
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87 | |
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88 | // Add the video stream using the default format codec. |
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89 | st = av_new_stream(oc, 0); |
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90 | if (!st) { |
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91 | // FIXME : possible errors are "too many streams" (can't be - we only |
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92 | // ask for one) and "out of memory" |
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93 | return false; |
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94 | } |
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95 | |
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96 | // Initialise the code. |
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97 | AVCodecContext *c = &st->codec; |
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98 | c->codec_id = fmt->video_codec; |
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99 | c->codec_type = CODEC_TYPE_VIDEO; |
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100 | |
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101 | // Set sample parameters. |
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102 | c->bit_rate = 400000; |
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103 | c->width = width; |
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104 | c->height = height; |
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105 | c->frame_rate = 25; // FPS |
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106 | c->frame_rate_base = 1; |
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107 | c->gop_size = 12; // One intra frame every twelve frames. |
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108 | c->pix_fmt = PIX_FMT_YUV420P; |
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109 | // B frames are backwards predicted - they can improve compression, |
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110 | // but may slow encoding and decoding. |
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111 | // c->max_b_frames = 2; |
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112 | |
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113 | // Set the output parameters (must be done even if no parameters). |
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114 | if (av_set_parameters(oc, NULL) < 0) { |
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115 | // FIXME : return value is an AVERROR_* value - probably |
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116 | // AVERROR_NOMEM or AVERROR_UNKNOWN. |
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117 | return false; |
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118 | } |
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119 | |
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120 | // Show the format we've ended up with (for debug purposes). |
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121 | // dump_format(oc, 0, fnm, 1); |
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122 | |
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123 | // Open the video codec and allocate the necessary encode buffers. |
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124 | AVCodec * codec = avcodec_find_encoder(c->codec_id); |
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125 | if (!codec) { |
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126 | // FIXME : Erm - internal ffmpeg library problem? |
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127 | return false; |
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128 | } |
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129 | if (avcodec_open(c, codec) < 0) { |
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130 | // FIXME : return value is an AVERROR_* value - probably |
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131 | // AVERROR_NOMEM or AVERROR_UNKNOWN. |
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132 | return false; |
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133 | } |
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134 | |
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135 | outbuf = (unsigned char *)malloc(OUTBUF_SIZE); |
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136 | if (!outbuf) { |
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137 | // FIXME : out of memory |
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138 | return false; |
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139 | } |
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140 | |
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141 | frame = avcodec_alloc_frame(); |
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142 | in = (AVPicture *)malloc(sizeof(AVPicture)); |
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143 | out = (AVPicture *)malloc(sizeof(AVPicture)); |
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144 | if (!frame || !in || !out) { |
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145 | // FIXME : out of memory |
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146 | return false; |
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147 | } |
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148 | |
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149 | int size = width * height; |
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150 | out->data[0] = (unsigned char *)malloc(size * 3 / 2); |
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151 | if (!out->data[0]) { |
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152 | // FIXME : out of memory |
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153 | return false; |
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154 | } |
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155 | avpicture_fill((AVPicture *)frame, out->data[0], c->pix_fmt, width, height); |
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156 | out->data[1] = frame->data[1]; |
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157 | out->data[2] = frame->data[2]; |
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158 | out->linesize[0] = frame->linesize[0]; |
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159 | out->linesize[1] = frame->linesize[1]; |
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160 | out->linesize[2] = frame->linesize[2]; |
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161 | |
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162 | pixels = (unsigned char *)malloc(width * height * 6); |
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163 | if (!pixels) { |
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164 | // FIXME : out of memory |
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165 | return false; |
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166 | } |
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167 | in->data[0] = pixels + height * width * 3; |
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168 | in->linesize[0] = width * 3; |
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169 | |
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170 | out_size = 0; |
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171 | |
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172 | if (url_fopen(&oc->pb, fnm, URL_WRONLY) < 0) { |
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173 | // FIXME : return value is -E* (e.g. -EIO). |
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174 | return false; |
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175 | } |
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176 | |
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177 | // Write the stream header, if any. |
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178 | if (av_write_header(oc) < 0) { |
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179 | // FIXME : return value is an AVERROR_* value. |
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180 | return false; |
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181 | } |
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182 | return true; |
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183 | #else |
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184 | return false; |
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185 | #endif |
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186 | } |
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187 | |
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188 | unsigned char * MovieMaker::GetBuffer() const { |
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189 | return pixels; |
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190 | } |
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191 | |
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192 | int MovieMaker::GetWidth() const { |
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193 | assert(st); |
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194 | #ifdef HAVE_AVFORMAT_H |
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195 | AVCodecContext *c = &st->codec; |
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196 | return c->width; |
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197 | #else |
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198 | return 0; |
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199 | #endif |
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200 | } |
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201 | |
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202 | int MovieMaker::GetHeight() const { |
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203 | assert(st); |
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204 | #ifdef HAVE_AVFORMAT_H |
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205 | AVCodecContext *c = &st->codec; |
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206 | return c->height; |
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207 | #else |
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208 | return 0; |
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209 | #endif |
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210 | } |
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211 | |
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212 | void MovieMaker::AddFrame() |
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213 | { |
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214 | #ifdef HAVE_AVFORMAT_H |
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215 | AVCodecContext * c = &st->codec; |
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216 | |
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217 | const int len = 3 * c->width; |
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218 | const int h = c->height; |
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219 | // Flip image vertically |
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220 | for (int y = 0; y < h; ++y) { |
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221 | memcpy(pixels + (2 * h - y - 1) * len, pixels + y * len, len); |
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222 | } |
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223 | |
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224 | img_convert(out, PIX_FMT_YUV420P, in, PIX_FMT_RGB24, c->width, c->height); |
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225 | |
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226 | // Encode this frame. |
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227 | out_size = avcodec_encode_video(c, outbuf, OUTBUF_SIZE, frame); |
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228 | // outsize == 0 means that this frame has been buffered, so there's nothing |
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229 | // to write yet. |
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230 | if (out_size != 0) { |
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231 | // Write the compressed frame to the media file. |
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232 | if (av_write_frame(oc, st->index, outbuf, out_size) != 0) { |
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233 | fprintf(stderr, "Error while writing video frame\n"); |
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234 | exit(1); |
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235 | } |
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236 | } |
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237 | #endif |
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238 | } |
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239 | |
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240 | MovieMaker::~MovieMaker() |
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241 | { |
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242 | #ifdef HAVE_AVFORMAT_H |
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243 | if (st) { |
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244 | // No more frames to compress. The codec may have a few frames |
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245 | // buffered if we're using B frames, so write those too. |
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246 | AVCodecContext * c = &st->codec; |
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247 | |
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248 | while (out_size) { |
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249 | out_size = avcodec_encode_video(c, outbuf, OUTBUF_SIZE, NULL); |
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250 | if (out_size) { |
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251 | if (av_write_frame(oc, st->index, outbuf, out_size) != 0) { |
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252 | fprintf(stderr, "Error while writing video frame\n"); |
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253 | exit(1); |
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254 | } |
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255 | } |
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256 | } |
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257 | |
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258 | // Close codec. |
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259 | avcodec_close(c); |
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260 | } |
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261 | |
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262 | free(frame); |
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263 | if (out) free(out->data[0]); |
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264 | free(outbuf); |
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265 | free(pixels); |
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266 | free(in); |
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267 | free(out); |
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268 | |
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269 | if (oc) { |
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270 | // Write the trailer, if any. |
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271 | av_write_trailer(oc); |
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272 | |
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273 | // Free the streams. |
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274 | for(int i = 0; i < oc->nb_streams; ++i) { |
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275 | av_freep(&oc->streams[i]); |
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276 | } |
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277 | |
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278 | // Close the output file. |
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279 | url_fclose(&oc->pb); |
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280 | |
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281 | // Free the stream. |
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282 | free(oc); |
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283 | } |
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284 | #endif |
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285 | } |
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