FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavfilter/af_apad.c
Date: 2025-10-24 10:15:11
Exec Total Coverage
Lines: 62 72 86.1%
Functions: 5 5 100.0%
Branches: 29 50 58.0%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2012 Michael Niedermayer
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * audio pad filter.
24 *
25 * Based on af_aresample.c
26 */
27
28 #include "libavutil/avstring.h"
29 #include "libavutil/channel_layout.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/avassert.h"
33 #include "avfilter.h"
34 #include "audio.h"
35 #include "filters.h"
36
37 typedef struct APadContext {
38 const AVClass *class;
39 int64_t next_pts;
40
41 int eof;
42 int packet_size;
43 int64_t pad_len, pad_len_left;
44 int64_t whole_len, whole_len_left;
45 int64_t pad_dur;
46 int64_t whole_dur;
47 } APadContext;
48
49 #define OFFSET(x) offsetof(APadContext, x)
50 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
51
52 static const AVOption apad_options[] = {
53 { "packet_size", "set silence packet size", OFFSET(packet_size), AV_OPT_TYPE_INT, { .i64 = 4096 }, 0, INT_MAX, A },
54 { "pad_len", "set number of samples of silence to add", OFFSET(pad_len), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, A },
55 { "whole_len", "set minimum target number of samples in the audio stream", OFFSET(whole_len), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, A },
56 { "pad_dur", "set duration of silence to add", OFFSET(pad_dur), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT64_MAX, A },
57 { "whole_dur", "set minimum target duration in the audio stream", OFFSET(whole_dur), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT64_MAX, A },
58 { NULL }
59 };
60
61 AVFILTER_DEFINE_CLASS(apad);
62
63 2 static av_cold int init(AVFilterContext *ctx)
64 {
65 2 APadContext *s = ctx->priv;
66
67 2 s->next_pts = AV_NOPTS_VALUE;
68
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 2 if (s->whole_len >= 0 && s->pad_len >= 0) {
69 ✗ av_log(ctx, AV_LOG_ERROR, "Both whole and pad length are set, this is not possible\n");
70 ✗ return AVERROR(EINVAL);
71 }
72
73 2 return 0;
74 }
75
76 65 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
77 {
78 65 AVFilterContext *ctx = inlink->dst;
79 65 APadContext *s = ctx->priv;
80
81
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 65 if (s->whole_len >= 0) {
82 ✗ s->whole_len_left = FFMAX(s->whole_len_left - frame->nb_samples, 0);
83 ✗ av_log(ctx, AV_LOG_DEBUG,
84 "n_out:%d whole_len_left:%"PRId64"\n", frame->nb_samples, s->whole_len_left);
85 }
86
87 65 s->next_pts = frame->pts + av_rescale_q(frame->nb_samples, (AVRational){1, inlink->sample_rate}, inlink->time_base);
88 65 return ff_filter_frame(ctx->outputs[0], frame);
89 }
90
91 2 static int push_frame(AVFilterLink *outlink)
92 {
93 2 AVFilterContext *ctx = outlink->src;
94 2 APadContext *s = ctx->priv;
95 AVFrame *outsamplesref;
96 int n_out;
97
98
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 2 if (ctx->is_disabled)
99 ✗ return 0;
100 2 n_out = s->packet_size;
101
102
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 2 if (s->whole_len >= 0 && s->pad_len < 0) {
103 ✗ s->pad_len = s->pad_len_left = s->whole_len_left;
104 }
105
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 2 if (s->pad_len >=0 || s->whole_len >= 0) {
106 2 n_out = FFMIN(n_out, s->pad_len_left);
107 2 s->pad_len_left -= n_out;
108 2 av_log(ctx, AV_LOG_DEBUG,
109 "padding n_out:%d pad_len_left:%"PRId64"\n", n_out, s->pad_len_left);
110 }
111
112
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 2 if (!n_out)
113 1 return AVERROR_EOF;
114
115 1 outsamplesref = ff_get_audio_buffer(outlink, n_out);
116
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 1 if (!outsamplesref)
117 ✗ return AVERROR(ENOMEM);
118
119
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 1 av_assert0(outsamplesref->sample_rate == outlink->sample_rate);
120
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 1 av_assert0(outsamplesref->nb_samples == n_out);
121
122 1 av_samples_set_silence(outsamplesref->extended_data, 0,
123 n_out,
124 outsamplesref->ch_layout.nb_channels,
125 1 outsamplesref->format);
126
127 1 outsamplesref->pts = s->next_pts;
128
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 1 if (s->next_pts != AV_NOPTS_VALUE)
129 1 s->next_pts += av_rescale_q(n_out, (AVRational){1, outlink->sample_rate}, outlink->time_base);
130
131 1 return ff_filter_frame(outlink, outsamplesref);
132 }
133
134 132 static int activate(AVFilterContext *ctx)
135 {
136 132 AVFilterLink *inlink = ctx->inputs[0];
137 132 AVFilterLink *outlink = ctx->outputs[0];
138 132 APadContext *s = ctx->priv;
139 int64_t pts;
140 int status;
141
142
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 132 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
143
144
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 132 if (!s->eof && ff_inlink_queued_frames(inlink)) {
145 65 AVFrame *frame = NULL;
146 int ret;
147
148 65 ret = ff_inlink_consume_frame(inlink, &frame);
149
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 65 if (ret < 0)
150 65 return ret;
151
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 65 if (ret > 0)
152 65 return filter_frame(inlink, frame);
153 }
154
155
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 67 if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &pts))
156 1 s->eof = status == AVERROR_EOF;
157
158
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 67 if (s->eof) {
159 2 int ret = push_frame(outlink);
160
161
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 2 if (ret == AVERROR_EOF) {
162 1 ff_outlink_set_status(outlink, AVERROR_EOF, s->next_pts);
163 1 return 0;
164 }
165 1 return ret;
166 }
167
168
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 65 FF_FILTER_FORWARD_WANTED(outlink, inlink);
169
170 ✗ return FFERROR_NOT_READY;
171 }
172
173 1 static int config_output(AVFilterLink *outlink)
174 {
175 1 AVFilterContext *ctx = outlink->src;
176 1 APadContext *s = ctx->priv;
177
178
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 1 if (s->pad_dur >= 0)
179 ✗ s->pad_len = av_rescale(s->pad_dur, outlink->sample_rate, AV_TIME_BASE);
180
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 1 if (s->whole_dur >= 0)
181 ✗ s->whole_len = av_rescale(s->whole_dur, outlink->sample_rate, AV_TIME_BASE);
182
183 1 s->pad_len_left = s->pad_len;
184 1 s->whole_len_left = s->whole_len;
185
186 1 return 0;
187 }
188
189 static const AVFilterPad apad_outputs[] = {
190 {
191 .name = "default",
192 .type = AVMEDIA_TYPE_AUDIO,
193 .config_props = config_output,
194 },
195 };
196
197 const FFFilter ff_af_apad = {
198 .p.name = "apad",
199 .p.description = NULL_IF_CONFIG_SMALL("Pad audio with silence."),
200 .p.priv_class = &apad_class,
201 .p.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
202 .init = init,
203 .activate = activate,
204 .priv_size = sizeof(APadContext),
205 FILTER_INPUTS(ff_audio_default_filterpad),
206 FILTER_OUTPUTS(apad_outputs),
207 };
208