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4349 | Serge | 1 | /* |
2 | * Copyright (c) 2011 Stefano Sabatini |
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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 | * libavfilter virtual input device |
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24 | */ |
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25 | |||
26 | /* #define DEBUG */ |
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27 | |||
28 | #include |
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29 | |||
30 | #include "libavutil/bprint.h" |
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31 | #include "libavutil/channel_layout.h" |
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32 | #include "libavutil/file.h" |
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33 | #include "libavutil/log.h" |
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34 | #include "libavutil/mem.h" |
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35 | #include "libavutil/opt.h" |
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36 | #include "libavutil/parseutils.h" |
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37 | #include "libavutil/pixdesc.h" |
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38 | #include "libavfilter/avfilter.h" |
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39 | #include "libavfilter/avfiltergraph.h" |
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40 | #include "libavfilter/buffersink.h" |
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41 | #include "libavformat/internal.h" |
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42 | #include "avdevice.h" |
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43 | |||
44 | typedef struct { |
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45 | AVClass *class; ///< class for private options |
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46 | char *graph_str; |
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47 | char *graph_filename; |
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48 | char *dump_graph; |
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49 | AVFilterGraph *graph; |
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50 | AVFilterContext **sinks; |
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51 | int *sink_stream_map; |
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52 | int *sink_eof; |
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53 | int *stream_sink_map; |
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54 | AVFrame *decoded_frame; |
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55 | } LavfiContext; |
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56 | |||
57 | static int *create_all_formats(int n) |
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58 | { |
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59 | int i, j, *fmts, count = 0; |
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60 | |||
61 | for (i = 0; i < n; i++) { |
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62 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i); |
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63 | if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) |
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64 | count++; |
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65 | } |
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66 | |||
67 | if (!(fmts = av_malloc((count+1) * sizeof(int)))) |
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68 | return NULL; |
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69 | for (j = 0, i = 0; i < n; i++) { |
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70 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i); |
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71 | if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) |
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72 | fmts[j++] = i; |
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73 | } |
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74 | fmts[j] = -1; |
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75 | return fmts; |
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76 | } |
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77 | |||
78 | av_cold static int lavfi_read_close(AVFormatContext *avctx) |
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79 | { |
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80 | LavfiContext *lavfi = avctx->priv_data; |
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81 | |||
82 | av_freep(&lavfi->sink_stream_map); |
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83 | av_freep(&lavfi->sink_eof); |
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84 | av_freep(&lavfi->stream_sink_map); |
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85 | av_freep(&lavfi->sinks); |
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86 | avfilter_graph_free(&lavfi->graph); |
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87 | av_frame_free(&lavfi->decoded_frame); |
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88 | |||
89 | return 0; |
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90 | } |
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91 | |||
92 | av_cold static int lavfi_read_header(AVFormatContext *avctx) |
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93 | { |
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94 | LavfiContext *lavfi = avctx->priv_data; |
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95 | AVFilterInOut *input_links = NULL, *output_links = NULL, *inout; |
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96 | AVFilter *buffersink, *abuffersink; |
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97 | int *pix_fmts = create_all_formats(AV_PIX_FMT_NB); |
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98 | enum AVMediaType type; |
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99 | int ret = 0, i, n; |
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100 | |||
101 | #define FAIL(ERR) { ret = ERR; goto end; } |
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102 | |||
103 | if (!pix_fmts) |
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104 | FAIL(AVERROR(ENOMEM)); |
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105 | |||
106 | avfilter_register_all(); |
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107 | |||
108 | buffersink = avfilter_get_by_name("buffersink"); |
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109 | abuffersink = avfilter_get_by_name("abuffersink"); |
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110 | |||
111 | if (lavfi->graph_filename && lavfi->graph_str) { |
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112 | av_log(avctx, AV_LOG_ERROR, |
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113 | "Only one of the graph or graph_file options must be specified\n"); |
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114 | FAIL(AVERROR(EINVAL)); |
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115 | } |
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116 | |||
117 | if (lavfi->graph_filename) { |
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118 | uint8_t *file_buf, *graph_buf; |
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119 | size_t file_bufsize; |
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120 | ret = av_file_map(lavfi->graph_filename, |
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121 | &file_buf, &file_bufsize, 0, avctx); |
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122 | if (ret < 0) |
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123 | goto end; |
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124 | |||
125 | /* create a 0-terminated string based on the read file */ |
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126 | graph_buf = av_malloc(file_bufsize + 1); |
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127 | if (!graph_buf) { |
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128 | av_file_unmap(file_buf, file_bufsize); |
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129 | FAIL(AVERROR(ENOMEM)); |
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130 | } |
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131 | memcpy(graph_buf, file_buf, file_bufsize); |
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132 | graph_buf[file_bufsize] = 0; |
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133 | av_file_unmap(file_buf, file_bufsize); |
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134 | lavfi->graph_str = graph_buf; |
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135 | } |
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136 | |||
137 | if (!lavfi->graph_str) |
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138 | lavfi->graph_str = av_strdup(avctx->filename); |
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139 | |||
140 | /* parse the graph, create a stream for each open output */ |
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141 | if (!(lavfi->graph = avfilter_graph_alloc())) |
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142 | FAIL(AVERROR(ENOMEM)); |
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143 | |||
144 | if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str, |
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145 | &input_links, &output_links, avctx)) < 0) |
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146 | FAIL(ret); |
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147 | |||
148 | if (input_links) { |
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149 | av_log(avctx, AV_LOG_ERROR, |
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150 | "Open inputs in the filtergraph are not acceptable\n"); |
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151 | FAIL(AVERROR(EINVAL)); |
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152 | } |
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153 | |||
154 | /* count the outputs */ |
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155 | for (n = 0, inout = output_links; inout; n++, inout = inout->next); |
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156 | |||
157 | if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n))) |
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158 | FAIL(AVERROR(ENOMEM)); |
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159 | if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n))) |
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160 | FAIL(AVERROR(ENOMEM)); |
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161 | if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n))) |
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162 | FAIL(AVERROR(ENOMEM)); |
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163 | |||
164 | for (i = 0; i < n; i++) |
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165 | lavfi->stream_sink_map[i] = -1; |
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166 | |||
167 | /* parse the output link names - they need to be of the form out0, out1, ... |
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168 | * create a mapping between them and the streams */ |
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169 | for (i = 0, inout = output_links; inout; i++, inout = inout->next) { |
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170 | int stream_idx; |
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171 | if (!strcmp(inout->name, "out")) |
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172 | stream_idx = 0; |
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173 | else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) { |
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174 | av_log(avctx, AV_LOG_ERROR, |
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175 | "Invalid outpad name '%s'\n", inout->name); |
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176 | FAIL(AVERROR(EINVAL)); |
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177 | } |
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178 | |||
179 | if ((unsigned)stream_idx >= n) { |
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180 | av_log(avctx, AV_LOG_ERROR, |
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181 | "Invalid index was specified in output '%s', " |
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182 | "must be a non-negative value < %d\n", |
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183 | inout->name, n); |
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184 | FAIL(AVERROR(EINVAL)); |
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185 | } |
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186 | |||
187 | /* is an audio or video output? */ |
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188 | type = inout->filter_ctx->output_pads[inout->pad_idx].type; |
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189 | if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) { |
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190 | av_log(avctx, AV_LOG_ERROR, |
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191 | "Output '%s' is not a video or audio output, not yet supported\n", inout->name); |
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192 | FAIL(AVERROR(EINVAL)); |
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193 | } |
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194 | |||
195 | if (lavfi->stream_sink_map[stream_idx] != -1) { |
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196 | av_log(avctx, AV_LOG_ERROR, |
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197 | "An output with stream index %d was already specified\n", |
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198 | stream_idx); |
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199 | FAIL(AVERROR(EINVAL)); |
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200 | } |
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201 | lavfi->sink_stream_map[i] = stream_idx; |
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202 | lavfi->stream_sink_map[stream_idx] = i; |
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203 | } |
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204 | |||
205 | /* for each open output create a corresponding stream */ |
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206 | for (i = 0, inout = output_links; inout; i++, inout = inout->next) { |
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207 | AVStream *st; |
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208 | if (!(st = avformat_new_stream(avctx, NULL))) |
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209 | FAIL(AVERROR(ENOMEM)); |
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210 | st->id = i; |
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211 | } |
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212 | |||
213 | /* create a sink for each output and connect them to the graph */ |
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214 | lavfi->sinks = av_malloc(sizeof(AVFilterContext *) * avctx->nb_streams); |
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215 | if (!lavfi->sinks) |
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216 | FAIL(AVERROR(ENOMEM)); |
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217 | |||
218 | for (i = 0, inout = output_links; inout; i++, inout = inout->next) { |
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219 | AVFilterContext *sink; |
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220 | |||
221 | type = inout->filter_ctx->output_pads[inout->pad_idx].type; |
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222 | |||
223 | if (type == AVMEDIA_TYPE_VIDEO && ! buffersink || |
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224 | type == AVMEDIA_TYPE_AUDIO && ! abuffersink) { |
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225 | av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n"); |
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226 | FAIL(AVERROR_FILTER_NOT_FOUND); |
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227 | } |
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228 | |||
229 | if (type == AVMEDIA_TYPE_VIDEO) { |
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230 | ret = avfilter_graph_create_filter(&sink, buffersink, |
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231 | inout->name, NULL, |
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232 | NULL, lavfi->graph); |
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233 | if (ret >= 0) |
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234 | ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN); |
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235 | if (ret < 0) |
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236 | goto end; |
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237 | } else if (type == AVMEDIA_TYPE_AUDIO) { |
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238 | enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_U8, |
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239 | AV_SAMPLE_FMT_S16, |
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240 | AV_SAMPLE_FMT_S32, |
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241 | AV_SAMPLE_FMT_FLT, |
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242 | AV_SAMPLE_FMT_DBL, -1 }; |
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243 | |||
244 | ret = avfilter_graph_create_filter(&sink, abuffersink, |
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245 | inout->name, NULL, |
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246 | NULL, lavfi->graph); |
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247 | if (ret >= 0) |
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248 | ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN); |
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249 | if (ret < 0) |
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250 | goto end; |
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251 | } |
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252 | |||
253 | lavfi->sinks[i] = sink; |
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254 | if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0) |
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255 | FAIL(ret); |
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256 | } |
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257 | |||
258 | /* configure the graph */ |
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259 | if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0) |
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260 | FAIL(ret); |
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261 | |||
262 | if (lavfi->dump_graph) { |
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263 | char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph); |
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264 | fputs(dump, stderr); |
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265 | fflush(stderr); |
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266 | av_free(dump); |
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267 | } |
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268 | |||
269 | /* fill each stream with the information in the corresponding sink */ |
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270 | for (i = 0; i < avctx->nb_streams; i++) { |
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271 | AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0]; |
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272 | AVStream *st = avctx->streams[i]; |
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273 | st->codec->codec_type = link->type; |
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274 | avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den); |
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275 | if (link->type == AVMEDIA_TYPE_VIDEO) { |
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276 | st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; |
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277 | st->codec->pix_fmt = link->format; |
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278 | st->codec->time_base = link->time_base; |
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279 | st->codec->width = link->w; |
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280 | st->codec->height = link->h; |
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281 | st ->sample_aspect_ratio = |
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282 | st->codec->sample_aspect_ratio = link->sample_aspect_ratio; |
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283 | avctx->probesize = FFMAX(avctx->probesize, |
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284 | link->w * link->h * |
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285 | av_get_padded_bits_per_pixel(av_pix_fmt_desc_get(link->format)) * |
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286 | 30); |
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287 | } else if (link->type == AVMEDIA_TYPE_AUDIO) { |
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288 | st->codec->codec_id = av_get_pcm_codec(link->format, -1); |
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289 | st->codec->channels = avfilter_link_get_channels(link); |
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290 | st->codec->sample_fmt = link->format; |
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291 | st->codec->sample_rate = link->sample_rate; |
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292 | st->codec->time_base = link->time_base; |
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293 | st->codec->channel_layout = link->channel_layout; |
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294 | if (st->codec->codec_id == AV_CODEC_ID_NONE) |
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295 | av_log(avctx, AV_LOG_ERROR, |
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296 | "Could not find PCM codec for sample format %s.\n", |
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297 | av_get_sample_fmt_name(link->format)); |
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298 | } |
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299 | } |
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300 | |||
301 | if (!(lavfi->decoded_frame = av_frame_alloc())) |
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302 | FAIL(AVERROR(ENOMEM)); |
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303 | |||
304 | end: |
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305 | av_free(pix_fmts); |
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306 | avfilter_inout_free(&input_links); |
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307 | avfilter_inout_free(&output_links); |
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308 | if (ret < 0) |
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309 | lavfi_read_close(avctx); |
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310 | return ret; |
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311 | } |
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312 | |||
313 | static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt) |
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314 | { |
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315 | LavfiContext *lavfi = avctx->priv_data; |
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316 | double min_pts = DBL_MAX; |
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317 | int stream_idx, min_pts_sink_idx = 0; |
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318 | AVFrame *frame = lavfi->decoded_frame; |
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319 | AVPicture pict; |
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320 | AVDictionary *frame_metadata; |
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321 | int ret, i; |
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322 | int size = 0; |
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323 | |||
324 | /* iterate through all the graph sinks. Select the sink with the |
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325 | * minimum PTS */ |
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326 | for (i = 0; i < avctx->nb_streams; i++) { |
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327 | AVRational tb = lavfi->sinks[i]->inputs[0]->time_base; |
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328 | double d; |
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329 | int ret; |
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330 | |||
331 | if (lavfi->sink_eof[i]) |
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332 | continue; |
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333 | |||
334 | ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame, |
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335 | AV_BUFFERSINK_FLAG_PEEK); |
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336 | if (ret == AVERROR_EOF) { |
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337 | av_dlog(avctx, "EOF sink_idx:%d\n", i); |
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338 | lavfi->sink_eof[i] = 1; |
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339 | continue; |
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340 | } else if (ret < 0) |
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341 | return ret; |
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342 | d = av_rescale_q(frame->pts, tb, AV_TIME_BASE_Q); |
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343 | av_dlog(avctx, "sink_idx:%d time:%f\n", i, d); |
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344 | av_frame_unref(frame); |
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345 | |||
346 | if (d < min_pts) { |
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347 | min_pts = d; |
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348 | min_pts_sink_idx = i; |
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349 | } |
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350 | } |
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351 | if (min_pts == DBL_MAX) |
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352 | return AVERROR_EOF; |
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353 | |||
354 | av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx); |
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355 | |||
356 | av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0); |
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357 | stream_idx = lavfi->sink_stream_map[min_pts_sink_idx]; |
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358 | |||
359 | if (frame->width /* FIXME best way of testing a video */) { |
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360 | size = avpicture_get_size(frame->format, frame->width, frame->height); |
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361 | if ((ret = av_new_packet(pkt, size)) < 0) |
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362 | return ret; |
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363 | |||
364 | memcpy(pict.data, frame->data, 4*sizeof(frame->data[0])); |
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365 | memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0])); |
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366 | |||
367 | avpicture_layout(&pict, frame->format, frame->width, frame->height, |
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368 | pkt->data, size); |
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369 | } else if (av_frame_get_channels(frame) /* FIXME test audio */) { |
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370 | size = frame->nb_samples * av_get_bytes_per_sample(frame->format) * |
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371 | av_frame_get_channels(frame); |
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372 | if ((ret = av_new_packet(pkt, size)) < 0) |
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373 | return ret; |
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374 | memcpy(pkt->data, frame->data[0], size); |
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375 | } |
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376 | |||
377 | frame_metadata = av_frame_get_metadata(frame); |
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378 | if (frame_metadata) { |
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379 | uint8_t *metadata; |
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380 | AVDictionaryEntry *e = NULL; |
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381 | AVBPrint meta_buf; |
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382 | |||
383 | av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
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384 | while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) { |
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385 | av_bprintf(&meta_buf, "%s", e->key); |
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386 | av_bprint_chars(&meta_buf, '\0', 1); |
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387 | av_bprintf(&meta_buf, "%s", e->value); |
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388 | av_bprint_chars(&meta_buf, '\0', 1); |
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389 | } |
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390 | if (!av_bprint_is_complete(&meta_buf) || |
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391 | !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA, |
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392 | meta_buf.len))) { |
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393 | av_bprint_finalize(&meta_buf, NULL); |
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394 | return AVERROR(ENOMEM); |
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395 | } |
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396 | memcpy(metadata, meta_buf.str, meta_buf.len); |
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397 | av_bprint_finalize(&meta_buf, NULL); |
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398 | } |
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399 | |||
400 | pkt->stream_index = stream_idx; |
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401 | pkt->pts = frame->pts; |
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402 | pkt->pos = av_frame_get_pkt_pos(frame); |
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403 | pkt->size = size; |
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404 | av_frame_unref(frame); |
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405 | return size; |
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406 | } |
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407 | |||
408 | #define OFFSET(x) offsetof(LavfiContext, x) |
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409 | |||
410 | #define DEC AV_OPT_FLAG_DECODING_PARAM |
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411 | |||
412 | static const AVOption options[] = { |
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413 | { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
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414 | { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC}, |
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415 | { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
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416 | { NULL }, |
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417 | }; |
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418 | |||
419 | static const AVClass lavfi_class = { |
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420 | .class_name = "lavfi indev", |
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421 | .item_name = av_default_item_name, |
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422 | .option = options, |
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423 | .version = LIBAVUTIL_VERSION_INT, |
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424 | }; |
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425 | |||
426 | AVInputFormat ff_lavfi_demuxer = { |
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427 | .name = "lavfi", |
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428 | .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"), |
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429 | .priv_data_size = sizeof(LavfiContext), |
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430 | .read_header = lavfi_read_header, |
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431 | .read_packet = lavfi_read_packet, |
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432 | .read_close = lavfi_read_close, |
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433 | .flags = AVFMT_NOFILE, |
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434 | .priv_class = &lavfi_class, |
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435 | };>>>>>>>>>>>>>>>>>> |