262 lines
8.1 KiB
C
262 lines
8.1 KiB
C
/*
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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 "libavutil/xga_font_data.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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int draw_text;
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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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{ "t", "display channel names", OFFSET(draw_text), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, 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", "CHANNEL", NULL };
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enum { VAR_VOLUME, VAR_CHANNEL, 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 void drawtext(AVFrame *pic, int x, int y, const char *txt)
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{
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const uint8_t *font;
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int font_height;
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int i;
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font = avpriv_cga_font, font_height = 8;
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for (i = 0; txt[i]; i++) {
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int char_y, mask;
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uint8_t *p = pic->data[0] + y*pic->linesize[0] + (x + i*8)*4;
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for (char_y = 0; char_y < font_height; char_y++) {
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for (mask = 0x80; mask; mask >>= 1) {
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if (font[txt[i] * font_height + char_y] & mask)
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AV_WN32(p, ~AV_RN32(p));
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p += 4;
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}
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p += pic->linesize[0] - 8*4;
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}
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}
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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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values[VAR_CHANNEL] = c;
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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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if (s->h >= 8 && s->draw_text)
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drawtext(s->out, 2, c * (s->h + s->b) + (s->h - 8) / 2,
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av_get_channel_name(av_channel_layout_extract_channel(insamples->channel_layout, c)));
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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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