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6147 | serge | 1 | /* |
2 | * Copyright (c) 2013 Paul B Mahol |
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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 | #include "libavutil/avstring.h" |
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22 | #include "libavutil/opt.h" |
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23 | #include "libavutil/samplefmt.h" |
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24 | #include "avfilter.h" |
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25 | #include "audio.h" |
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26 | #include "internal.h" |
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27 | |||
28 | typedef struct ChanDelay { |
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29 | int delay; |
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30 | unsigned delay_index; |
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31 | unsigned index; |
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32 | uint8_t *samples; |
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33 | } ChanDelay; |
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34 | |||
35 | typedef struct AudioDelayContext { |
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36 | const AVClass *class; |
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37 | char *delays; |
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38 | ChanDelay *chandelay; |
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39 | int nb_delays; |
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40 | int block_align; |
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41 | unsigned max_delay; |
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42 | int64_t next_pts; |
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43 | |||
44 | void (*delay_channel)(ChanDelay *d, int nb_samples, |
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45 | const uint8_t *src, uint8_t *dst); |
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46 | } AudioDelayContext; |
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47 | |||
48 | #define OFFSET(x) offsetof(AudioDelayContext, x) |
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49 | #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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50 | |||
51 | static const AVOption adelay_options[] = { |
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52 | { "delays", "set list of delays for each channel", OFFSET(delays), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A }, |
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53 | { NULL } |
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54 | }; |
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55 | |||
56 | AVFILTER_DEFINE_CLASS(adelay); |
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57 | |||
58 | static int query_formats(AVFilterContext *ctx) |
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59 | { |
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60 | AVFilterChannelLayouts *layouts; |
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61 | AVFilterFormats *formats; |
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62 | static const enum AVSampleFormat sample_fmts[] = { |
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63 | AV_SAMPLE_FMT_U8P, AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_S32P, |
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64 | AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP, |
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65 | AV_SAMPLE_FMT_NONE |
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66 | }; |
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67 | int ret; |
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68 | |||
69 | layouts = ff_all_channel_layouts(); |
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70 | if (!layouts) |
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71 | return AVERROR(ENOMEM); |
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72 | ret = ff_set_common_channel_layouts(ctx, layouts); |
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73 | if (ret < 0) |
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74 | return ret; |
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75 | |||
76 | formats = ff_make_format_list(sample_fmts); |
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77 | if (!formats) |
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78 | return AVERROR(ENOMEM); |
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79 | ret = ff_set_common_formats(ctx, formats); |
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80 | if (ret < 0) |
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81 | return ret; |
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82 | |||
83 | formats = ff_all_samplerates(); |
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84 | if (!formats) |
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85 | return AVERROR(ENOMEM); |
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86 | return ff_set_common_samplerates(ctx, formats); |
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87 | } |
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88 | |||
89 | #define DELAY(name, type, fill) \ |
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90 | static void delay_channel_## name ##p(ChanDelay *d, int nb_samples, \ |
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91 | const uint8_t *ssrc, uint8_t *ddst) \ |
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92 | { \ |
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93 | const type *src = (type *)ssrc; \ |
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94 | type *dst = (type *)ddst; \ |
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95 | type *samples = (type *)d->samples; \ |
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96 | \ |
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97 | while (nb_samples) { \ |
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98 | if (d->delay_index < d->delay) { \ |
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99 | const int len = FFMIN(nb_samples, d->delay - d->delay_index); \ |
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100 | \ |
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101 | memcpy(&samples[d->delay_index], src, len * sizeof(type)); \ |
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102 | memset(dst, fill, len * sizeof(type)); \ |
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103 | d->delay_index += len; \ |
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104 | src += len; \ |
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105 | dst += len; \ |
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106 | nb_samples -= len; \ |
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107 | } else { \ |
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108 | *dst = samples[d->index]; \ |
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109 | samples[d->index] = *src; \ |
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110 | nb_samples--; \ |
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111 | d->index++; \ |
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112 | src++, dst++; \ |
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113 | d->index = d->index >= d->delay ? 0 : d->index; \ |
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114 | } \ |
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115 | } \ |
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116 | } |
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117 | |||
118 | DELAY(u8, uint8_t, 0x80) |
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119 | DELAY(s16, int16_t, 0) |
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120 | DELAY(s32, int32_t, 0) |
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121 | DELAY(flt, float, 0) |
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122 | DELAY(dbl, double, 0) |
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123 | |||
124 | static int config_input(AVFilterLink *inlink) |
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125 | { |
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126 | AVFilterContext *ctx = inlink->dst; |
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127 | AudioDelayContext *s = ctx->priv; |
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128 | char *p, *arg, *saveptr = NULL; |
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129 | int i; |
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130 | |||
131 | s->chandelay = av_calloc(inlink->channels, sizeof(*s->chandelay)); |
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132 | if (!s->chandelay) |
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133 | return AVERROR(ENOMEM); |
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134 | s->nb_delays = inlink->channels; |
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135 | s->block_align = av_get_bytes_per_sample(inlink->format); |
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136 | |||
137 | p = s->delays; |
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138 | for (i = 0; i < s->nb_delays; i++) { |
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139 | ChanDelay *d = &s->chandelay[i]; |
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140 | float delay; |
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141 | |||
142 | if (!(arg = av_strtok(p, "|", &saveptr))) |
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143 | break; |
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144 | |||
145 | p = NULL; |
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146 | sscanf(arg, "%f", &delay); |
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147 | |||
148 | d->delay = delay * inlink->sample_rate / 1000.0; |
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149 | if (d->delay < 0) { |
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150 | av_log(ctx, AV_LOG_ERROR, "Delay must be non negative number.\n"); |
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151 | return AVERROR(EINVAL); |
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152 | } |
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153 | } |
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154 | |||
155 | for (i = 0; i < s->nb_delays; i++) { |
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156 | ChanDelay *d = &s->chandelay[i]; |
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157 | |||
158 | if (!d->delay) |
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159 | continue; |
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160 | |||
161 | d->samples = av_malloc_array(d->delay, s->block_align); |
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162 | if (!d->samples) |
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163 | return AVERROR(ENOMEM); |
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164 | |||
165 | s->max_delay = FFMAX(s->max_delay, d->delay); |
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166 | } |
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167 | |||
168 | if (!s->max_delay) { |
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169 | av_log(ctx, AV_LOG_ERROR, "At least one delay >0 must be specified.\n"); |
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170 | return AVERROR(EINVAL); |
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171 | } |
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172 | |||
173 | switch (inlink->format) { |
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174 | case AV_SAMPLE_FMT_U8P : s->delay_channel = delay_channel_u8p ; break; |
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175 | case AV_SAMPLE_FMT_S16P: s->delay_channel = delay_channel_s16p; break; |
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176 | case AV_SAMPLE_FMT_S32P: s->delay_channel = delay_channel_s32p; break; |
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177 | case AV_SAMPLE_FMT_FLTP: s->delay_channel = delay_channel_fltp; break; |
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178 | case AV_SAMPLE_FMT_DBLP: s->delay_channel = delay_channel_dblp; break; |
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179 | } |
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180 | |||
181 | return 0; |
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182 | } |
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183 | |||
184 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) |
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185 | { |
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186 | AVFilterContext *ctx = inlink->dst; |
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187 | AudioDelayContext *s = ctx->priv; |
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188 | AVFrame *out_frame; |
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189 | int i; |
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190 | |||
191 | if (ctx->is_disabled || !s->delays) |
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192 | return ff_filter_frame(ctx->outputs[0], frame); |
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193 | |||
194 | out_frame = ff_get_audio_buffer(inlink, frame->nb_samples); |
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195 | if (!out_frame) |
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196 | return AVERROR(ENOMEM); |
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197 | av_frame_copy_props(out_frame, frame); |
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198 | |||
199 | for (i = 0; i < s->nb_delays; i++) { |
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200 | ChanDelay *d = &s->chandelay[i]; |
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201 | const uint8_t *src = frame->extended_data[i]; |
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202 | uint8_t *dst = out_frame->extended_data[i]; |
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203 | |||
204 | if (!d->delay) |
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205 | memcpy(dst, src, frame->nb_samples * s->block_align); |
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206 | else |
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207 | s->delay_channel(d, frame->nb_samples, src, dst); |
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208 | } |
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209 | |||
210 | s->next_pts = frame->pts + av_rescale_q(frame->nb_samples, (AVRational){1, inlink->sample_rate}, inlink->time_base); |
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211 | av_frame_free(&frame); |
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212 | return ff_filter_frame(ctx->outputs[0], out_frame); |
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213 | } |
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214 | |||
215 | static int request_frame(AVFilterLink *outlink) |
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216 | { |
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217 | AVFilterContext *ctx = outlink->src; |
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218 | AudioDelayContext *s = ctx->priv; |
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219 | int ret; |
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220 | |||
221 | ret = ff_request_frame(ctx->inputs[0]); |
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222 | if (ret == AVERROR_EOF && !ctx->is_disabled && s->max_delay) { |
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223 | int nb_samples = FFMIN(s->max_delay, 2048); |
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224 | AVFrame *frame; |
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225 | |||
226 | frame = ff_get_audio_buffer(outlink, nb_samples); |
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227 | if (!frame) |
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228 | return AVERROR(ENOMEM); |
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229 | s->max_delay -= nb_samples; |
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230 | |||
231 | av_samples_set_silence(frame->extended_data, 0, |
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232 | frame->nb_samples, |
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233 | outlink->channels, |
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234 | frame->format); |
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235 | |||
236 | frame->pts = s->next_pts; |
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237 | if (s->next_pts != AV_NOPTS_VALUE) |
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238 | s->next_pts += av_rescale_q(nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base); |
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239 | |||
240 | ret = filter_frame(ctx->inputs[0], frame); |
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241 | } |
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242 | |||
243 | return ret; |
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244 | } |
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245 | |||
246 | static av_cold void uninit(AVFilterContext *ctx) |
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247 | { |
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248 | AudioDelayContext *s = ctx->priv; |
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249 | int i; |
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250 | |||
251 | for (i = 0; i < s->nb_delays; i++) |
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252 | av_freep(&s->chandelay[i].samples); |
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253 | av_freep(&s->chandelay); |
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254 | } |
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255 | |||
256 | static const AVFilterPad adelay_inputs[] = { |
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257 | { |
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258 | .name = "default", |
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259 | .type = AVMEDIA_TYPE_AUDIO, |
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260 | .config_props = config_input, |
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261 | .filter_frame = filter_frame, |
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262 | }, |
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263 | { NULL } |
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264 | }; |
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265 | |||
266 | static const AVFilterPad adelay_outputs[] = { |
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267 | { |
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268 | .name = "default", |
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269 | .request_frame = request_frame, |
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270 | .type = AVMEDIA_TYPE_AUDIO, |
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271 | }, |
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272 | { NULL } |
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273 | }; |
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274 | |||
275 | AVFilter ff_af_adelay = { |
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276 | .name = "adelay", |
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277 | .description = NULL_IF_CONFIG_SMALL("Delay one or more audio channels."), |
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278 | .query_formats = query_formats, |
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279 | .priv_size = sizeof(AudioDelayContext), |
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280 | .priv_class = &adelay_class, |
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281 | .uninit = uninit, |
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282 | .inputs = adelay_inputs, |
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283 | .outputs = adelay_outputs, |
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284 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, |
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285 | };>>>>>>>> |