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1 | /* |
2 | * Copyright (c) 2013 Nicolas George | |
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 License | |
8 | * 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 | |
14 | * GNU Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public License | |
17 | * along with FFmpeg; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "libavutil/opt.h" | |
22 | #include "avfilter.h" | |
23 | #include "internal.h" | |
24 | ||
25 | typedef struct { | |
26 | const AVClass *class; | |
27 | int sample_rate; | |
28 | int rescale_pts; | |
29 | } ASetRateContext; | |
30 | ||
31 | #define CONTEXT ASetRateContext | |
32 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | |
33 | ||
34 | #define OPT_GENERIC(name, field, def, min, max, descr, type, deffield, ...) \ | |
35 | { name, descr, offsetof(CONTEXT, field), AV_OPT_TYPE_ ## type, \ | |
36 | { .deffield = def }, min, max, FLAGS, __VA_ARGS__ } | |
37 | ||
38 | #define OPT_INT(name, field, def, min, max, descr, ...) \ | |
39 | OPT_GENERIC(name, field, def, min, max, descr, INT, i64, __VA_ARGS__) | |
40 | ||
41 | static const AVOption asetrate_options[] = { | |
42 | OPT_INT("sample_rate", sample_rate, 44100, 1, INT_MAX, "set the sample rate"), | |
43 | OPT_INT("r", sample_rate, 44100, 1, INT_MAX, "set the sample rate"), | |
44 | {NULL}, | |
45 | }; | |
46 | ||
47 | AVFILTER_DEFINE_CLASS(asetrate); | |
48 | ||
49 | static av_cold int query_formats(AVFilterContext *ctx) | |
50 | { | |
51 | ASetRateContext *sr = ctx->priv; | |
52 | int sample_rates[] = { sr->sample_rate, -1 }; | |
53 | ||
54 | ff_formats_ref(ff_make_format_list(sample_rates), | |
55 | &ctx->outputs[0]->in_samplerates); | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static av_cold int config_props(AVFilterLink *outlink) | |
60 | { | |
61 | AVFilterContext *ctx = outlink->src; | |
62 | ASetRateContext *sr = ctx->priv; | |
63 | AVFilterLink *inlink = ctx->inputs[0]; | |
64 | AVRational intb = ctx->inputs[0]->time_base; | |
65 | int inrate = inlink->sample_rate; | |
66 | ||
67 | if (intb.num == 1 && intb.den == inrate) { | |
68 | outlink->time_base.num = 1; | |
69 | outlink->time_base.den = outlink->sample_rate; | |
70 | } else { | |
71 | outlink->time_base = intb; | |
72 | sr->rescale_pts = 1; | |
73 | if (av_q2d(intb) > 1.0 / FFMAX(inrate, outlink->sample_rate)) | |
74 | av_log(ctx, AV_LOG_WARNING, "Time base is inaccurate\n"); | |
75 | } | |
76 | return 0; | |
77 | } | |
78 | ||
79 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
80 | { | |
81 | AVFilterContext *ctx = inlink->dst; | |
82 | ASetRateContext *sr = ctx->priv; | |
83 | AVFilterLink *outlink = ctx->outputs[0]; | |
84 | ||
85 | frame->sample_rate = outlink->sample_rate; | |
86 | if (sr->rescale_pts) | |
87 | frame->pts = av_rescale(frame->pts, inlink->sample_rate, | |
88 | outlink->sample_rate); | |
89 | return ff_filter_frame(outlink, frame); | |
90 | } | |
91 | ||
92 | static const AVFilterPad asetrate_inputs[] = { | |
93 | { | |
94 | .name = "default", | |
95 | .type = AVMEDIA_TYPE_AUDIO, | |
96 | .filter_frame = filter_frame, | |
97 | }, | |
98 | { NULL } | |
99 | }; | |
100 | ||
101 | static const AVFilterPad asetrate_outputs[] = { | |
102 | { | |
103 | .name = "default", | |
104 | .type = AVMEDIA_TYPE_AUDIO, | |
105 | .config_props = config_props, | |
106 | }, | |
107 | { NULL } | |
108 | }; | |
109 | ||
110 | AVFilter ff_af_asetrate = { | |
111 | .name = "asetrate", | |
112 | .description = NULL_IF_CONFIG_SMALL("Change the sample rate without " | |
113 | "altering the data."), | |
114 | .query_formats = query_formats, | |
115 | .priv_size = sizeof(ASetRateContext), | |
116 | .inputs = asetrate_inputs, | |
117 | .outputs = asetrate_outputs, | |
118 | .priv_class = &asetrate_class, | |
119 | }; |