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4349 | Serge | 1 | /* |
2 | * Copyright (c) 2012 Nicolas George |
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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. |
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14 | * See the GNU 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 License |
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17 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
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18 | * 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 | * concat audio-video filter |
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24 | */ |
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25 | |||
26 | #include "libavutil/avassert.h" |
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27 | #include "libavutil/avstring.h" |
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28 | #include "libavutil/channel_layout.h" |
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29 | #include "libavutil/opt.h" |
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30 | #include "avfilter.h" |
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31 | #define FF_BUFQUEUE_SIZE 256 |
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32 | #include "bufferqueue.h" |
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33 | #include "internal.h" |
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34 | #include "video.h" |
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35 | #include "audio.h" |
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36 | |||
37 | #define TYPE_ALL 2 |
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38 | |||
39 | typedef struct { |
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40 | const AVClass *class; |
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41 | unsigned nb_streams[TYPE_ALL]; /**< number of out streams of each type */ |
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42 | unsigned nb_segments; |
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43 | unsigned cur_idx; /**< index of the first input of current segment */ |
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44 | int64_t delta_ts; /**< timestamp to add to produce output timestamps */ |
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45 | unsigned nb_in_active; /**< number of active inputs in current segment */ |
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46 | unsigned unsafe; |
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47 | struct concat_in { |
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48 | int64_t pts; |
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49 | int64_t nb_frames; |
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50 | unsigned eof; |
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51 | struct FFBufQueue queue; |
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52 | } *in; |
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53 | } ConcatContext; |
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54 | |||
55 | #define OFFSET(x) offsetof(ConcatContext, x) |
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56 | #define A AV_OPT_FLAG_AUDIO_PARAM |
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57 | #define F AV_OPT_FLAG_FILTERING_PARAM |
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58 | #define V AV_OPT_FLAG_VIDEO_PARAM |
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59 | |||
60 | static const AVOption concat_options[] = { |
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61 | { "n", "specify the number of segments", OFFSET(nb_segments), |
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62 | AV_OPT_TYPE_INT, { .i64 = 2 }, 2, INT_MAX, V|A|F}, |
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63 | { "v", "specify the number of video streams", |
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64 | OFFSET(nb_streams[AVMEDIA_TYPE_VIDEO]), |
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65 | AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, V|F }, |
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66 | { "a", "specify the number of audio streams", |
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67 | OFFSET(nb_streams[AVMEDIA_TYPE_AUDIO]), |
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68 | AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, A|F}, |
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69 | { "unsafe", "enable unsafe mode", |
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70 | OFFSET(unsafe), |
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71 | AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V|A|F}, |
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72 | { NULL } |
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73 | }; |
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74 | |||
75 | AVFILTER_DEFINE_CLASS(concat); |
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76 | |||
77 | static int query_formats(AVFilterContext *ctx) |
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78 | { |
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79 | ConcatContext *cat = ctx->priv; |
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80 | unsigned type, nb_str, idx0 = 0, idx, str, seg; |
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81 | AVFilterFormats *formats, *rates = NULL; |
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82 | AVFilterChannelLayouts *layouts = NULL; |
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83 | |||
84 | for (type = 0; type < TYPE_ALL; type++) { |
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85 | nb_str = cat->nb_streams[type]; |
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86 | for (str = 0; str < nb_str; str++) { |
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87 | idx = idx0; |
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88 | |||
89 | /* Set the output formats */ |
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90 | formats = ff_all_formats(type); |
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91 | if (!formats) |
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92 | return AVERROR(ENOMEM); |
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93 | ff_formats_ref(formats, &ctx->outputs[idx]->in_formats); |
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94 | if (type == AVMEDIA_TYPE_AUDIO) { |
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95 | rates = ff_all_samplerates(); |
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96 | if (!rates) |
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97 | return AVERROR(ENOMEM); |
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98 | ff_formats_ref(rates, &ctx->outputs[idx]->in_samplerates); |
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99 | layouts = ff_all_channel_layouts(); |
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100 | if (!layouts) |
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101 | return AVERROR(ENOMEM); |
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102 | ff_channel_layouts_ref(layouts, &ctx->outputs[idx]->in_channel_layouts); |
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103 | } |
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104 | |||
105 | /* Set the same formats for each corresponding input */ |
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106 | for (seg = 0; seg < cat->nb_segments; seg++) { |
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107 | ff_formats_ref(formats, &ctx->inputs[idx]->out_formats); |
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108 | if (type == AVMEDIA_TYPE_AUDIO) { |
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109 | ff_formats_ref(rates, &ctx->inputs[idx]->out_samplerates); |
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110 | ff_channel_layouts_ref(layouts, &ctx->inputs[idx]->out_channel_layouts); |
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111 | } |
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112 | idx += ctx->nb_outputs; |
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113 | } |
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114 | |||
115 | idx0++; |
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116 | } |
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117 | } |
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118 | return 0; |
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119 | } |
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120 | |||
121 | static int config_output(AVFilterLink *outlink) |
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122 | { |
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123 | AVFilterContext *ctx = outlink->src; |
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124 | ConcatContext *cat = ctx->priv; |
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125 | unsigned out_no = FF_OUTLINK_IDX(outlink); |
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126 | unsigned in_no = out_no, seg; |
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127 | AVFilterLink *inlink = ctx->inputs[in_no]; |
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128 | |||
129 | /* enhancement: find a common one */ |
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130 | outlink->time_base = AV_TIME_BASE_Q; |
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131 | outlink->w = inlink->w; |
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132 | outlink->h = inlink->h; |
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133 | outlink->sample_aspect_ratio = inlink->sample_aspect_ratio; |
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134 | outlink->format = inlink->format; |
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135 | for (seg = 1; seg < cat->nb_segments; seg++) { |
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136 | inlink = ctx->inputs[in_no += ctx->nb_outputs]; |
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137 | if (!outlink->sample_aspect_ratio.num) |
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138 | outlink->sample_aspect_ratio = inlink->sample_aspect_ratio; |
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139 | /* possible enhancement: unsafe mode, do not check */ |
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140 | if (outlink->w != inlink->w || |
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141 | outlink->h != inlink->h || |
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142 | outlink->sample_aspect_ratio.num != inlink->sample_aspect_ratio.num && |
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143 | inlink->sample_aspect_ratio.num || |
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144 | outlink->sample_aspect_ratio.den != inlink->sample_aspect_ratio.den) { |
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145 | av_log(ctx, AV_LOG_ERROR, "Input link %s parameters " |
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146 | "(size %dx%d, SAR %d:%d) do not match the corresponding " |
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147 | "output link %s parameters (%dx%d, SAR %d:%d)\n", |
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148 | ctx->input_pads[in_no].name, inlink->w, inlink->h, |
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149 | inlink->sample_aspect_ratio.num, |
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150 | inlink->sample_aspect_ratio.den, |
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151 | ctx->input_pads[out_no].name, outlink->w, outlink->h, |
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152 | outlink->sample_aspect_ratio.num, |
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153 | outlink->sample_aspect_ratio.den); |
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154 | if (!cat->unsafe) |
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155 | return AVERROR(EINVAL); |
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156 | } |
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157 | } |
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158 | |||
159 | return 0; |
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160 | } |
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161 | |||
162 | static int push_frame(AVFilterContext *ctx, unsigned in_no, AVFrame *buf) |
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163 | { |
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164 | ConcatContext *cat = ctx->priv; |
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165 | unsigned out_no = in_no % ctx->nb_outputs; |
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166 | AVFilterLink * inlink = ctx-> inputs[ in_no]; |
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167 | AVFilterLink *outlink = ctx->outputs[out_no]; |
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168 | struct concat_in *in = &cat->in[in_no]; |
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169 | |||
170 | buf->pts = av_rescale_q(buf->pts, inlink->time_base, outlink->time_base); |
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171 | in->pts = buf->pts; |
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172 | in->nb_frames++; |
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173 | /* add duration to input PTS */ |
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174 | if (inlink->sample_rate) |
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175 | /* use number of audio samples */ |
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176 | in->pts += av_rescale_q(buf->nb_samples, |
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177 | (AVRational){ 1, inlink->sample_rate }, |
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178 | outlink->time_base); |
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179 | else if (in->nb_frames >= 2) |
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180 | /* use mean duration */ |
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181 | in->pts = av_rescale(in->pts, in->nb_frames, in->nb_frames - 1); |
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182 | |||
183 | buf->pts += cat->delta_ts; |
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184 | return ff_filter_frame(outlink, buf); |
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185 | } |
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186 | |||
187 | static int process_frame(AVFilterLink *inlink, AVFrame *buf) |
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188 | { |
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189 | AVFilterContext *ctx = inlink->dst; |
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190 | ConcatContext *cat = ctx->priv; |
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191 | unsigned in_no = FF_INLINK_IDX(inlink); |
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192 | |||
193 | if (in_no < cat->cur_idx) { |
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194 | av_log(ctx, AV_LOG_ERROR, "Frame after EOF on input %s\n", |
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195 | ctx->input_pads[in_no].name); |
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196 | av_frame_free(&buf); |
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197 | } else if (in_no >= cat->cur_idx + ctx->nb_outputs) { |
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198 | ff_bufqueue_add(ctx, &cat->in[in_no].queue, buf); |
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199 | } else { |
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200 | return push_frame(ctx, in_no, buf); |
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201 | } |
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202 | return 0; |
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203 | } |
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204 | |||
205 | static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h) |
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206 | { |
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207 | AVFilterContext *ctx = inlink->dst; |
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208 | unsigned in_no = FF_INLINK_IDX(inlink); |
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209 | AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs]; |
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210 | |||
211 | return ff_get_video_buffer(outlink, w, h); |
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212 | } |
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213 | |||
214 | static AVFrame *get_audio_buffer(AVFilterLink *inlink, int nb_samples) |
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215 | { |
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216 | AVFilterContext *ctx = inlink->dst; |
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217 | unsigned in_no = FF_INLINK_IDX(inlink); |
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218 | AVFilterLink *outlink = ctx->outputs[in_no % ctx->nb_outputs]; |
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219 | |||
220 | return ff_get_audio_buffer(outlink, nb_samples); |
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221 | } |
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222 | |||
223 | static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
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224 | { |
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225 | return process_frame(inlink, buf); |
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226 | } |
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227 | |||
228 | static void close_input(AVFilterContext *ctx, unsigned in_no) |
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229 | { |
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230 | ConcatContext *cat = ctx->priv; |
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231 | |||
232 | cat->in[in_no].eof = 1; |
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233 | cat->nb_in_active--; |
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234 | av_log(ctx, AV_LOG_VERBOSE, "EOF on %s, %d streams left in segment.\n", |
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235 | ctx->input_pads[in_no].name, cat->nb_in_active); |
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236 | } |
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237 | |||
238 | static void find_next_delta_ts(AVFilterContext *ctx, int64_t *seg_delta) |
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239 | { |
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240 | ConcatContext *cat = ctx->priv; |
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241 | unsigned i = cat->cur_idx; |
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242 | unsigned imax = i + ctx->nb_outputs; |
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243 | int64_t pts; |
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244 | |||
245 | pts = cat->in[i++].pts; |
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246 | for (; i < imax; i++) |
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247 | pts = FFMAX(pts, cat->in[i].pts); |
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248 | cat->delta_ts += pts; |
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249 | *seg_delta = pts; |
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250 | } |
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251 | |||
252 | static int send_silence(AVFilterContext *ctx, unsigned in_no, unsigned out_no, |
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253 | int64_t seg_delta) |
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254 | { |
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255 | ConcatContext *cat = ctx->priv; |
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256 | AVFilterLink *outlink = ctx->outputs[out_no]; |
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257 | int64_t base_pts = cat->in[in_no].pts + cat->delta_ts - seg_delta; |
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258 | int64_t nb_samples, sent = 0; |
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259 | int frame_nb_samples, ret; |
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260 | AVRational rate_tb = { 1, ctx->inputs[in_no]->sample_rate }; |
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261 | AVFrame *buf; |
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262 | int nb_channels = av_get_channel_layout_nb_channels(outlink->channel_layout); |
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263 | |||
264 | if (!rate_tb.den) |
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265 | return AVERROR_BUG; |
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266 | nb_samples = av_rescale_q(seg_delta - cat->in[in_no].pts, |
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267 | outlink->time_base, rate_tb); |
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268 | frame_nb_samples = FFMAX(9600, rate_tb.den / 5); /* arbitrary */ |
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269 | while (nb_samples) { |
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270 | frame_nb_samples = FFMIN(frame_nb_samples, nb_samples); |
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271 | buf = ff_get_audio_buffer(outlink, frame_nb_samples); |
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272 | if (!buf) |
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273 | return AVERROR(ENOMEM); |
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274 | av_samples_set_silence(buf->extended_data, 0, frame_nb_samples, |
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275 | nb_channels, outlink->format); |
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276 | buf->pts = base_pts + av_rescale_q(sent, rate_tb, outlink->time_base); |
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277 | ret = ff_filter_frame(outlink, buf); |
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278 | if (ret < 0) |
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279 | return ret; |
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280 | sent += frame_nb_samples; |
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281 | nb_samples -= frame_nb_samples; |
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282 | } |
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283 | return 0; |
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284 | } |
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285 | |||
286 | static int flush_segment(AVFilterContext *ctx) |
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287 | { |
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288 | int ret; |
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289 | ConcatContext *cat = ctx->priv; |
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290 | unsigned str, str_max; |
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291 | int64_t seg_delta; |
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292 | |||
293 | find_next_delta_ts(ctx, &seg_delta); |
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294 | cat->cur_idx += ctx->nb_outputs; |
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295 | cat->nb_in_active = ctx->nb_outputs; |
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296 | av_log(ctx, AV_LOG_VERBOSE, "Segment finished at pts=%"PRId64"\n", |
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297 | cat->delta_ts); |
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298 | |||
299 | if (cat->cur_idx < ctx->nb_inputs) { |
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300 | /* pad audio streams with silence */ |
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301 | str = cat->nb_streams[AVMEDIA_TYPE_VIDEO]; |
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302 | str_max = str + cat->nb_streams[AVMEDIA_TYPE_AUDIO]; |
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303 | for (; str < str_max; str++) { |
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304 | ret = send_silence(ctx, cat->cur_idx - ctx->nb_outputs + str, str, |
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305 | seg_delta); |
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306 | if (ret < 0) |
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307 | return ret; |
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308 | } |
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309 | /* flush queued buffers */ |
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310 | /* possible enhancement: flush in PTS order */ |
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311 | str_max = cat->cur_idx + ctx->nb_outputs; |
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312 | for (str = cat->cur_idx; str < str_max; str++) { |
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313 | while (cat->in[str].queue.available) { |
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314 | ret = push_frame(ctx, str, ff_bufqueue_get(&cat->in[str].queue)); |
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315 | if (ret < 0) |
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316 | return ret; |
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317 | } |
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318 | } |
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319 | } |
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320 | return 0; |
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321 | } |
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322 | |||
323 | static int request_frame(AVFilterLink *outlink) |
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324 | { |
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325 | AVFilterContext *ctx = outlink->src; |
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326 | ConcatContext *cat = ctx->priv; |
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327 | unsigned out_no = FF_OUTLINK_IDX(outlink); |
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328 | unsigned in_no = out_no + cat->cur_idx; |
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329 | unsigned str, str_max; |
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330 | int ret; |
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331 | |||
332 | while (1) { |
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333 | if (in_no >= ctx->nb_inputs) |
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334 | return AVERROR_EOF; |
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335 | if (!cat->in[in_no].eof) { |
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336 | ret = ff_request_frame(ctx->inputs[in_no]); |
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337 | if (ret != AVERROR_EOF) |
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338 | return ret; |
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339 | close_input(ctx, in_no); |
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340 | } |
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341 | /* cycle on all inputs to finish the segment */ |
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342 | /* possible enhancement: request in PTS order */ |
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343 | str_max = cat->cur_idx + ctx->nb_outputs - 1; |
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344 | for (str = cat->cur_idx; cat->nb_in_active; |
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345 | str = str == str_max ? cat->cur_idx : str + 1) { |
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346 | if (cat->in[str].eof) |
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347 | continue; |
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348 | ret = ff_request_frame(ctx->inputs[str]); |
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349 | if (ret == AVERROR_EOF) |
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350 | close_input(ctx, str); |
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351 | else if (ret < 0) |
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352 | return ret; |
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353 | } |
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354 | ret = flush_segment(ctx); |
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355 | if (ret < 0) |
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356 | return ret; |
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357 | in_no += ctx->nb_outputs; |
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358 | } |
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359 | } |
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360 | |||
361 | static av_cold int init(AVFilterContext *ctx) |
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362 | { |
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363 | ConcatContext *cat = ctx->priv; |
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364 | unsigned seg, type, str; |
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365 | |||
366 | /* create input pads */ |
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367 | for (seg = 0; seg < cat->nb_segments; seg++) { |
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368 | for (type = 0; type < TYPE_ALL; type++) { |
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369 | for (str = 0; str < cat->nb_streams[type]; str++) { |
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370 | AVFilterPad pad = { |
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371 | .type = type, |
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372 | .get_video_buffer = get_video_buffer, |
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373 | .get_audio_buffer = get_audio_buffer, |
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374 | .filter_frame = filter_frame, |
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375 | }; |
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376 | pad.name = av_asprintf("in%d:%c%d", seg, "va"[type], str); |
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377 | ff_insert_inpad(ctx, ctx->nb_inputs, &pad); |
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378 | } |
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379 | } |
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380 | } |
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381 | /* create output pads */ |
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382 | for (type = 0; type < TYPE_ALL; type++) { |
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383 | for (str = 0; str < cat->nb_streams[type]; str++) { |
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384 | AVFilterPad pad = { |
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385 | .type = type, |
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386 | .config_props = config_output, |
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387 | .request_frame = request_frame, |
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388 | }; |
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389 | pad.name = av_asprintf("out:%c%d", "va"[type], str); |
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390 | ff_insert_outpad(ctx, ctx->nb_outputs, &pad); |
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391 | } |
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392 | } |
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393 | |||
394 | cat->in = av_calloc(ctx->nb_inputs, sizeof(*cat->in)); |
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395 | if (!cat->in) |
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396 | return AVERROR(ENOMEM); |
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397 | cat->nb_in_active = ctx->nb_outputs; |
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398 | return 0; |
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399 | } |
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400 | |||
401 | static av_cold void uninit(AVFilterContext *ctx) |
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402 | { |
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403 | ConcatContext *cat = ctx->priv; |
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404 | unsigned i; |
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405 | |||
406 | for (i = 0; i < ctx->nb_inputs; i++) { |
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407 | av_freep(&ctx->input_pads[i].name); |
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408 | ff_bufqueue_discard_all(&cat->in[i].queue); |
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409 | } |
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410 | for (i = 0; i < ctx->nb_outputs; i++) |
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411 | av_freep(&ctx->output_pads[i].name); |
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412 | av_free(cat->in); |
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413 | } |
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414 | |||
415 | AVFilter avfilter_avf_concat = { |
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416 | .name = "concat", |
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417 | .description = NULL_IF_CONFIG_SMALL("Concatenate audio and video streams."), |
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418 | .init = init, |
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419 | .uninit = uninit, |
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420 | .query_formats = query_formats, |
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421 | .priv_size = sizeof(ConcatContext), |
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422 | .inputs = NULL, |
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423 | .outputs = NULL, |
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424 | .priv_class = &concat_class, |
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425 | .flags = AVFILTER_FLAG_DYNAMIC_INPUTS | AVFILTER_FLAG_DYNAMIC_OUTPUTS, |
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426 | };>>>>>>>>>>>>>>>>>>>>>>>>> |