| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2012 Andrey Utkin | ||
| 3 | * Copyright (c) 2012 Stefano Sabatini | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | /** | ||
| 23 | * @file | ||
| 24 | * Filter that changes number of samples on single output operation | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "libavutil/channel_layout.h" | ||
| 28 | #include "libavutil/opt.h" | ||
| 29 | #include "avfilter.h" | ||
| 30 | #include "audio.h" | ||
| 31 | #include "filters.h" | ||
| 32 | #include "internal.h" | ||
| 33 | |||
| 34 | typedef struct ASNSContext { | ||
| 35 | const AVClass *class; | ||
| 36 | int nb_out_samples; ///< how many samples to output | ||
| 37 | int pad; | ||
| 38 | } ASNSContext; | ||
| 39 | |||
| 40 | #define OFFSET(x) offsetof(ASNSContext, x) | ||
| 41 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM | ||
| 42 | |||
| 43 | static const AVOption asetnsamples_options[] = { | ||
| 44 | { "nb_out_samples", "set the number of per-frame output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS }, | ||
| 45 | { "n", "set the number of per-frame output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS }, | ||
| 46 | { "pad", "pad last frame with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS }, | ||
| 47 | { "p", "pad last frame with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS }, | ||
| 48 | { NULL } | ||
| 49 | }; | ||
| 50 | |||
| 51 | AVFILTER_DEFINE_CLASS(asetnsamples); | ||
| 52 | |||
| 53 | 1564 | static int activate(AVFilterContext *ctx) | |
| 54 | { | ||
| 55 | 1564 | AVFilterLink *inlink = ctx->inputs[0]; | |
| 56 | 1564 | AVFilterLink *outlink = ctx->outputs[0]; | |
| 57 | 1564 | ASNSContext *s = ctx->priv; | |
| 58 | 1564 | AVFrame *frame = NULL, *pad_frame; | |
| 59 | int ret; | ||
| 60 | |||
| 61 |
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1564 | FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); |
| 62 | |||
| 63 |
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1564 | if (ctx->is_disabled) |
| 64 | ✗ | ret = ff_inlink_consume_frame(inlink, &frame); | |
| 65 | else | ||
| 66 | 1564 | ret = ff_inlink_consume_samples(inlink, s->nb_out_samples, s->nb_out_samples, &frame); | |
| 67 |
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1564 | if (ret < 0) |
| 68 | ✗ | return ret; | |
| 69 | |||
| 70 |
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1564 | if (ret > 0) { |
| 71 |
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1037 | if (!s->pad || ctx->is_disabled || frame->nb_samples == s->nb_out_samples) |
| 72 | 1035 | return ff_filter_frame(outlink, frame); | |
| 73 | |||
| 74 | 2 | pad_frame = ff_get_audio_buffer(outlink, s->nb_out_samples); | |
| 75 |
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2 | if (!pad_frame) { |
| 76 | ✗ | av_frame_free(&frame); | |
| 77 | ✗ | return AVERROR(ENOMEM); | |
| 78 | } | ||
| 79 | |||
| 80 | 2 | ret = av_frame_copy_props(pad_frame, frame); | |
| 81 |
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2 | if (ret < 0) { |
| 82 | ✗ | av_frame_free(&pad_frame); | |
| 83 | ✗ | av_frame_free(&frame); | |
| 84 | ✗ | return ret; | |
| 85 | } | ||
| 86 | |||
| 87 | 2 | av_samples_copy(pad_frame->extended_data, frame->extended_data, | |
| 88 | 2 | 0, 0, frame->nb_samples, frame->ch_layout.nb_channels, frame->format); | |
| 89 | 2 | av_samples_set_silence(pad_frame->extended_data, frame->nb_samples, | |
| 90 | 2 | s->nb_out_samples - frame->nb_samples, frame->ch_layout.nb_channels, | |
| 91 | 2 | frame->format); | |
| 92 | 2 | av_frame_free(&frame); | |
| 93 | 2 | return ff_filter_frame(outlink, pad_frame); | |
| 94 | } | ||
| 95 | |||
| 96 |
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527 | FF_FILTER_FORWARD_STATUS(inlink, outlink); |
| 97 |
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524 | if (ff_inlink_queued_samples(inlink) >= s->nb_out_samples) { |
| 98 | ✗ | ff_filter_set_ready(ctx, 100); | |
| 99 | ✗ | return 0; | |
| 100 | } | ||
| 101 |
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524 | FF_FILTER_FORWARD_WANTED(outlink, inlink); |
| 102 | |||
| 103 | ✗ | return FFERROR_NOT_READY; | |
| 104 | } | ||
| 105 | |||
| 106 | const AVFilter ff_af_asetnsamples = { | ||
| 107 | .name = "asetnsamples", | ||
| 108 | .description = NULL_IF_CONFIG_SMALL("Set the number of samples for each output audio frames."), | ||
| 109 | .priv_size = sizeof(ASNSContext), | ||
| 110 | .priv_class = &asetnsamples_class, | ||
| 111 | FILTER_INPUTS(ff_audio_default_filterpad), | ||
| 112 | FILTER_OUTPUTS(ff_audio_default_filterpad), | ||
| 113 | .activate = activate, | ||
| 114 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, | ||
| 115 | .process_command = ff_filter_process_command, | ||
| 116 | }; | ||
| 117 |