mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
10 years ago
parent
96e73fa649
commit
f76d7d4b01
6 changed files with 267 additions and 1 deletions
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/*
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* Copyright (c) 2015 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/channel_layout.h" |
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#include "libavutil/eval.h" |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/parseutils.h" |
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#include "avfilter.h" |
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#include "formats.h" |
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#include "audio.h" |
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#include "video.h" |
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#include "internal.h" |
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typedef struct ShowVolumeContext { |
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const AVClass *class; |
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int w, h; |
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int f, b; |
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AVRational frame_rate; |
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char *color; |
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AVFrame *out; |
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AVExpr *c_expr; |
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} ShowVolumeContext; |
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#define OFFSET(x) offsetof(ShowVolumeContext, x) |
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption showvolume_options[] = { |
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{ "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS }, |
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{ "r", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS }, |
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{ "b", "set border width", OFFSET(b), AV_OPT_TYPE_INT, {.i64=1}, 0, 5, FLAGS }, |
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{ "w", "set channel width", OFFSET(w), AV_OPT_TYPE_INT, {.i64=400}, 40, 1080, FLAGS }, |
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{ "h", "set channel height", OFFSET(h), AV_OPT_TYPE_INT, {.i64=20}, 1, 100, FLAGS }, |
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{ "f", "set fade", OFFSET(f), AV_OPT_TYPE_INT, {.i64=20}, 1, 255, FLAGS }, |
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{ "c", "set volume color expression", OFFSET(color), AV_OPT_TYPE_STRING, {.str="if(gte(VOLUME,-2), if(gte(VOLUME,-1),0xff, 0xffff),0xff00)"}, 0, 0, FLAGS }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(showvolume); |
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static const char *const var_names[] = { "VOLUME", NULL }; |
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enum { VAR_VOLUME, VAR_VARS_NB }; |
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static av_cold int init(AVFilterContext *ctx) |
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{ |
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ShowVolumeContext *s = ctx->priv; |
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int ret; |
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if (s->color) { |
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ret = av_expr_parse(&s->c_expr, s->color, var_names, |
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NULL, NULL, NULL, NULL, 0, ctx); |
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if (ret < 0) |
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return ret; |
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} |
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return 0; |
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} |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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AVFilterFormats *formats = NULL; |
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AVFilterChannelLayouts *layouts = NULL; |
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AVFilterLink *inlink = ctx->inputs[0]; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE }; |
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static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE }; |
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formats = ff_make_format_list(sample_fmts); |
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if (!formats) |
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return AVERROR(ENOMEM); |
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ff_formats_ref(formats, &inlink->out_formats); |
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layouts = ff_all_channel_layouts(); |
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if (!layouts) |
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return AVERROR(ENOMEM); |
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ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts); |
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formats = ff_all_samplerates(); |
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if (!formats) |
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return AVERROR(ENOMEM); |
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ff_formats_ref(formats, &inlink->out_samplerates); |
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formats = ff_make_format_list(pix_fmts); |
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if (!formats) |
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return AVERROR(ENOMEM); |
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ff_formats_ref(formats, &outlink->in_formats); |
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return 0; |
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} |
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static int config_input(AVFilterLink *inlink) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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ShowVolumeContext *s = ctx->priv; |
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int nb_samples; |
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nb_samples = FFMAX(1024, ((double)inlink->sample_rate / av_q2d(s->frame_rate)) + 0.5); |
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inlink->partial_buf_size = |
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inlink->min_samples = |
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inlink->max_samples = nb_samples; |
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return 0; |
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} |
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static int config_output(AVFilterLink *outlink) |
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{ |
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ShowVolumeContext *s = outlink->src->priv; |
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AVFilterLink *inlink = outlink->src->inputs[0]; |
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outlink->w = s->w; |
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outlink->h = s->h * inlink->channels + (inlink->channels - 1) * s->b; |
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outlink->sample_aspect_ratio = (AVRational){1,1}; |
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outlink->frame_rate = s->frame_rate; |
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return 0; |
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} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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ShowVolumeContext *s = ctx->priv; |
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int c, i, j, k; |
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double values[VAR_VARS_NB]; |
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if (!s->out || s->out->width != outlink->w || |
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s->out->height != outlink->h) { |
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av_frame_free(&s->out); |
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s->out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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if (!s->out) { |
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av_frame_free(&insamples); |
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return AVERROR(ENOMEM); |
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} |
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for (i = 0; i < outlink->h; i++) |
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memset(s->out->data[0] + i * s->out->linesize[0], 0, outlink->w * 4); |
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} |
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s->out->pts = insamples->pts; |
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for (j = 0; j < outlink->h; j++) { |
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uint8_t *dst = s->out->data[0] + j * s->out->linesize[0]; |
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for (k = 0; k < s->w; k++) { |
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dst[k * 4 + 0] = FFMAX(dst[k * 4 + 0] - s->f, 0); |
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dst[k * 4 + 1] = FFMAX(dst[k * 4 + 1] - s->f, 0); |
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dst[k * 4 + 2] = FFMAX(dst[k * 4 + 2] - s->f, 0); |
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dst[k * 4 + 3] = FFMAX(dst[k * 4 + 3] - s->f, 0); |
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} |
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} |
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for (c = 0; c < inlink->channels; c++) { |
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float *src = (float *)insamples->extended_data[c]; |
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float max = 0; |
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int color; |
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for (i = 0; i < insamples->nb_samples; i++) |
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max = FFMAX(max, src[i]); |
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max = av_clipf(max, 0, 1); |
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values[VAR_VOLUME] = 20.0 * log(max) / M_LN10; |
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color = av_expr_eval(s->c_expr, values, NULL); |
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for (j = 0; j < s->h; j++) { |
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uint8_t *dst = s->out->data[0] + (c * s->h + c * s->b + j) * s->out->linesize[0]; |
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for (k = 0; k < s->w * max; k++) |
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AV_WN32A(dst + k * 4, color); |
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} |
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} |
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av_frame_free(&insamples); |
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return ff_filter_frame(outlink, av_frame_clone(s->out)); |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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ShowVolumeContext *s = ctx->priv; |
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av_frame_free(&s->out); |
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av_expr_free(s->c_expr); |
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} |
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static const AVFilterPad showvolume_inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.config_props = config_input, |
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.filter_frame = filter_frame, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad showvolume_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.config_props = config_output, |
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}, |
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{ NULL } |
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}; |
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AVFilter ff_avf_showvolume = { |
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.name = "showvolume", |
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.description = NULL_IF_CONFIG_SMALL("Convert input audio volume to video output."), |
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.init = init, |
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.uninit = uninit, |
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.query_formats = query_formats, |
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.priv_size = sizeof(ShowVolumeContext), |
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.inputs = showvolume_inputs, |
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.outputs = showvolume_outputs, |
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.priv_class = &showvolume_class, |
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}; |
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