| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "filters.h" | ||
| 24 | #include "formats.h" | ||
| 25 | |||
| 26 | typedef struct ASetRateContext { | ||
| 27 | const AVClass *class; | ||
| 28 | int sample_rate; | ||
| 29 | int rescale_pts; | ||
| 30 | } ASetRateContext; | ||
| 31 | |||
| 32 | #define CONTEXT ASetRateContext | ||
| 33 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 34 | |||
| 35 | #define OPT_GENERIC(name, field, def, min, max, descr, type, deffield, ...) \ | ||
| 36 | { name, descr, offsetof(CONTEXT, field), AV_OPT_TYPE_ ## type, \ | ||
| 37 | { .deffield = def }, min, max, FLAGS, __VA_ARGS__ } | ||
| 38 | |||
| 39 | #define OPT_INT(name, field, def, min, max, descr, ...) \ | ||
| 40 | OPT_GENERIC(name, field, def, min, max, descr, INT, i64, __VA_ARGS__) | ||
| 41 | |||
| 42 | static const AVOption asetrate_options[] = { | ||
| 43 | OPT_INT("sample_rate", sample_rate, 44100, 1, INT_MAX, "set the sample rate",), | ||
| 44 | OPT_INT("r", sample_rate, 44100, 1, INT_MAX, "set the sample rate",), | ||
| 45 | {NULL}, | ||
| 46 | }; | ||
| 47 | |||
| 48 | AVFILTER_DEFINE_CLASS(asetrate); | ||
| 49 | |||
| 50 | 1 | static av_cold int query_formats(const AVFilterContext *ctx, | |
| 51 | AVFilterFormatsConfig **cfg_in, | ||
| 52 | AVFilterFormatsConfig **cfg_out) | ||
| 53 | { | ||
| 54 | 1 | const ASetRateContext *sr = ctx->priv; | |
| 55 | 1 | int ret, sample_rates[] = { sr->sample_rate, -1 }; | |
| 56 | |||
| 57 |
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1 | if ((ret = ff_formats_ref(ff_all_samplerates(), |
| 58 | 1 | &cfg_in[0]->samplerates)) < 0) | |
| 59 | ✗ | return ret; | |
| 60 | |||
| 61 | 1 | return ff_formats_ref(ff_make_format_list(sample_rates), | |
| 62 | 1 | &cfg_out[0]->samplerates); | |
| 63 | } | ||
| 64 | |||
| 65 | 1 | static av_cold int config_props(AVFilterLink *outlink) | |
| 66 | { | ||
| 67 | 1 | AVFilterContext *ctx = outlink->src; | |
| 68 | 1 | ASetRateContext *sr = ctx->priv; | |
| 69 | 1 | AVFilterLink *inlink = ctx->inputs[0]; | |
| 70 | 1 | AVRational intb = ctx->inputs[0]->time_base; | |
| 71 | 1 | int inrate = inlink->sample_rate; | |
| 72 | |||
| 73 |
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1 | if (intb.num == 1 && intb.den == inrate) { |
| 74 | 1 | outlink->time_base.num = 1; | |
| 75 | 1 | outlink->time_base.den = outlink->sample_rate; | |
| 76 | } else { | ||
| 77 | ✗ | outlink->time_base = intb; | |
| 78 | ✗ | sr->rescale_pts = 1; | |
| 79 | ✗ | if (av_q2d(intb) > 1.0 / FFMAX(inrate, outlink->sample_rate)) | |
| 80 | ✗ | av_log(ctx, AV_LOG_WARNING, "Time base is inaccurate\n"); | |
| 81 | } | ||
| 82 | 1 | return 0; | |
| 83 | } | ||
| 84 | |||
| 85 | 20 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
| 86 | { | ||
| 87 | 20 | AVFilterContext *ctx = inlink->dst; | |
| 88 | 20 | ASetRateContext *sr = ctx->priv; | |
| 89 | 20 | AVFilterLink *outlink = ctx->outputs[0]; | |
| 90 | |||
| 91 | 20 | frame->sample_rate = outlink->sample_rate; | |
| 92 |
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20 | if (sr->rescale_pts) |
| 93 | ✗ | frame->pts = av_rescale(frame->pts, inlink->sample_rate, | |
| 94 | ✗ | outlink->sample_rate); | |
| 95 | 20 | return ff_filter_frame(outlink, frame); | |
| 96 | } | ||
| 97 | |||
| 98 | static const AVFilterPad asetrate_inputs[] = { | ||
| 99 | { | ||
| 100 | .name = "default", | ||
| 101 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 102 | .filter_frame = filter_frame, | ||
| 103 | }, | ||
| 104 | }; | ||
| 105 | |||
| 106 | static const AVFilterPad asetrate_outputs[] = { | ||
| 107 | { | ||
| 108 | .name = "default", | ||
| 109 | .type = AVMEDIA_TYPE_AUDIO, | ||
| 110 | .config_props = config_props, | ||
| 111 | }, | ||
| 112 | }; | ||
| 113 | |||
| 114 | const AVFilter ff_af_asetrate = { | ||
| 115 | .name = "asetrate", | ||
| 116 | .description = NULL_IF_CONFIG_SMALL("Change the sample rate without " | ||
| 117 | "altering the data."), | ||
| 118 | .priv_size = sizeof(ASetRateContext), | ||
| 119 | FILTER_INPUTS(asetrate_inputs), | ||
| 120 | FILTER_OUTPUTS(asetrate_outputs), | ||
| 121 | FILTER_QUERY_FUNC2(query_formats), | ||
| 122 | .priv_class = &asetrate_class, | ||
| 123 | .flags = AVFILTER_FLAG_METADATA_ONLY, | ||
| 124 | }; | ||
| 125 |