FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/af_apad.c
Date: 2024-04-19 07:31:02
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 #include "internal.h"
37
38 typedef struct APadContext {
39 const AVClass *class;
40 int64_t next_pts;
41
42 int eof;
43 int packet_size;
44 int64_t pad_len, pad_len_left;
45 int64_t whole_len, whole_len_left;
46 int64_t pad_dur;
47 int64_t whole_dur;
48 } APadContext;
49
50 #define OFFSET(x) offsetof(APadContext, x)
51 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
52
53 static const AVOption apad_options[] = {
54 { "packet_size", "set silence packet size", OFFSET(packet_size), AV_OPT_TYPE_INT, { .i64 = 4096 }, 0, INT_MAX, A },
55 { "pad_len", "set number of samples of silence to add", OFFSET(pad_len), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, A },
56 { "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 },
57 { "pad_dur", "set duration of silence to add", OFFSET(pad_dur), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT64_MAX, A },
58 { "whole_dur", "set minimum target duration in the audio stream", OFFSET(whole_dur), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT64_MAX, A },
59 { NULL }
60 };
61
62 AVFILTER_DEFINE_CLASS(apad);
63
64 2 static av_cold int init(AVFilterContext *ctx)
65 {
66 2 APadContext *s = ctx->priv;
67
68 2 s->next_pts = AV_NOPTS_VALUE;
69
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2 if (s->whole_len >= 0 && s->pad_len >= 0) {
70 av_log(ctx, AV_LOG_ERROR, "Both whole and pad length are set, this is not possible\n");
71 return AVERROR(EINVAL);
72 }
73
74 2 return 0;
75 }
76
77 65 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
78 {
79 65 AVFilterContext *ctx = inlink->dst;
80 65 APadContext *s = ctx->priv;
81
82
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65 if (s->whole_len >= 0) {
83 s->whole_len_left = FFMAX(s->whole_len_left - frame->nb_samples, 0);
84 av_log(ctx, AV_LOG_DEBUG,
85 "n_out:%d whole_len_left:%"PRId64"\n", frame->nb_samples, s->whole_len_left);
86 }
87
88 65 s->next_pts = frame->pts + av_rescale_q(frame->nb_samples, (AVRational){1, inlink->sample_rate}, inlink->time_base);
89 65 return ff_filter_frame(ctx->outputs[0], frame);
90 }
91
92 2 static int push_frame(AVFilterLink *outlink)
93 {
94 2 AVFilterContext *ctx = outlink->src;
95 2 APadContext *s = ctx->priv;
96 AVFrame *outsamplesref;
97 int n_out;
98
99
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2 if (ctx->is_disabled)
100 return 0;
101 2 n_out = s->packet_size;
102
103
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2 if (s->whole_len >= 0 && s->pad_len < 0) {
104 s->pad_len = s->pad_len_left = s->whole_len_left;
105 }
106
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2 if (s->pad_len >=0 || s->whole_len >= 0) {
107 2 n_out = FFMIN(n_out, s->pad_len_left);
108 2 s->pad_len_left -= n_out;
109 2 av_log(ctx, AV_LOG_DEBUG,
110 "padding n_out:%d pad_len_left:%"PRId64"\n", n_out, s->pad_len_left);
111 }
112
113
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2 if (!n_out)
114 1 return AVERROR_EOF;
115
116 1 outsamplesref = ff_get_audio_buffer(outlink, n_out);
117
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1 if (!outsamplesref)
118 return AVERROR(ENOMEM);
119
120
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1 av_assert0(outsamplesref->sample_rate == outlink->sample_rate);
121
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1 av_assert0(outsamplesref->nb_samples == n_out);
122
123 1 av_samples_set_silence(outsamplesref->extended_data, 0,
124 n_out,
125 outsamplesref->ch_layout.nb_channels,
126 1 outsamplesref->format);
127
128 1 outsamplesref->pts = s->next_pts;
129
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1 if (s->next_pts != AV_NOPTS_VALUE)
130 1 s->next_pts += av_rescale_q(n_out, (AVRational){1, outlink->sample_rate}, outlink->time_base);
131
132 1 return ff_filter_frame(outlink, outsamplesref);
133 }
134
135 132 static int activate(AVFilterContext *ctx)
136 {
137 132 AVFilterLink *inlink = ctx->inputs[0];
138 132 AVFilterLink *outlink = ctx->outputs[0];
139 132 APadContext *s = ctx->priv;
140 int64_t pts;
141 int status;
142
143
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132 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
144
145
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132 if (!s->eof && ff_inlink_queued_frames(inlink)) {
146 65 AVFrame *frame = NULL;
147 int ret;
148
149 65 ret = ff_inlink_consume_frame(inlink, &frame);
150
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65 if (ret < 0)
151 65 return ret;
152
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65 if (ret > 0)
153 65 return filter_frame(inlink, frame);
154 }
155
156
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67 if (!s->eof && ff_inlink_acknowledge_status(inlink, &status, &pts))
157 1 s->eof = status == AVERROR_EOF;
158
159
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67 if (s->eof) {
160 2 int ret = push_frame(outlink);
161
162
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2 if (ret == AVERROR_EOF) {
163 1 ff_outlink_set_status(outlink, AVERROR_EOF, s->next_pts);
164 1 return 0;
165 }
166 1 return ret;
167 }
168
169
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65 FF_FILTER_FORWARD_WANTED(outlink, inlink);
170
171 return FFERROR_NOT_READY;
172 }
173
174 1 static int config_output(AVFilterLink *outlink)
175 {
176 1 AVFilterContext *ctx = outlink->src;
177 1 APadContext *s = ctx->priv;
178
179
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1 if (s->pad_dur >= 0)
180 s->pad_len = av_rescale(s->pad_dur, outlink->sample_rate, AV_TIME_BASE);
181
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1 if (s->whole_dur >= 0)
182 s->whole_len = av_rescale(s->whole_dur, outlink->sample_rate, AV_TIME_BASE);
183
184 1 s->pad_len_left = s->pad_len;
185 1 s->whole_len_left = s->whole_len;
186
187 1 return 0;
188 }
189
190 static const AVFilterPad apad_outputs[] = {
191 {
192 .name = "default",
193 .type = AVMEDIA_TYPE_AUDIO,
194 .config_props = config_output,
195 },
196 };
197
198 const AVFilter ff_af_apad = {
199 .name = "apad",
200 .description = NULL_IF_CONFIG_SMALL("Pad audio with silence."),
201 .init = init,
202 .activate = activate,
203 .priv_size = sizeof(APadContext),
204 FILTER_INPUTS(ff_audio_default_filterpad),
205 FILTER_OUTPUTS(apad_outputs),
206 .priv_class = &apad_class,
207 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
208 };
209