mirror of
https://github.com/FFmpeg/FFmpeg.git
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a212a983c7
Fixes potential division by zero Fixes: CID1292295 Reviewed-by: Ganesh Ajjanagadde <gajjanag@mit.edu> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
541 lines
17 KiB
C
541 lines
17 KiB
C
/*
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* Copyright (c) 2012 Stefano Sabatini
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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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/**
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* @file
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* audio to video multimedia filter
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/channel_layout.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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enum ShowWavesMode {
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MODE_POINT,
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MODE_LINE,
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MODE_P2P,
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MODE_CENTERED_LINE,
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MODE_NB,
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};
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struct frame_node {
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AVFrame *frame;
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struct frame_node *next;
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};
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typedef struct {
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const AVClass *class;
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int w, h;
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AVRational rate;
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int buf_idx;
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int16_t *buf_idy; /* y coordinate of previous sample for each channel */
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AVFrame *outpicref;
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int req_fullfilled;
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int n;
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int sample_count_mod;
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int mode; ///< ShowWavesMode
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int split_channels;
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void (*draw_sample)(uint8_t *buf, int height, int linesize,
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int16_t sample, int16_t *prev_y, int intensity);
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/* single picture */
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int single_pic;
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struct frame_node *audio_frames;
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struct frame_node *last_frame;
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int64_t total_samples;
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int64_t *sum; /* abs sum of the samples per channel */
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} ShowWavesContext;
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#define OFFSET(x) offsetof(ShowWavesContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption showwaves_options[] = {
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{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
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{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
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{ "mode", "select display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_POINT}, 0, MODE_NB-1, FLAGS, "mode"},
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{ "point", "draw a point for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_POINT}, .flags=FLAGS, .unit="mode"},
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{ "line", "draw a line for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_LINE}, .flags=FLAGS, .unit="mode"},
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{ "p2p", "draw a line between samples", 0, AV_OPT_TYPE_CONST, {.i64=MODE_P2P}, .flags=FLAGS, .unit="mode"},
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{ "cline", "draw a centered line for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_CENTERED_LINE}, .flags=FLAGS, .unit="mode"},
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{ "n", "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
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{ "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
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{ "r", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
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{ "split_channels", "draw channels separately", OFFSET(split_channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(showwaves);
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static av_cold void uninit(AVFilterContext *ctx)
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{
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ShowWavesContext *showwaves = ctx->priv;
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av_frame_free(&showwaves->outpicref);
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av_freep(&showwaves->buf_idy);
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if (showwaves->single_pic) {
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struct frame_node *node = showwaves->audio_frames;
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while (node) {
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struct frame_node *tmp = node;
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node = node->next;
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av_frame_free(&tmp->frame);
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av_freep(&tmp);
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}
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av_freep(&showwaves->sum);
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showwaves->last_frame = NULL;
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}
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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_S16, AV_SAMPLE_FMT_NONE };
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static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
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/* set input audio formats */
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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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/* set output video format */
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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_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *inlink = ctx->inputs[0];
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ShowWavesContext *showwaves = ctx->priv;
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int nb_channels = inlink->channels;
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if (!showwaves->n)
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showwaves->n = FFMAX(1, ((double)inlink->sample_rate / (showwaves->w * av_q2d(showwaves->rate))) + 0.5);
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showwaves->buf_idx = 0;
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if (!(showwaves->buf_idy = av_mallocz_array(nb_channels, sizeof(*showwaves->buf_idy)))) {
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av_log(ctx, AV_LOG_ERROR, "Could not allocate showwaves buffer\n");
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return AVERROR(ENOMEM);
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}
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outlink->w = showwaves->w;
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outlink->h = showwaves->h;
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outlink->sample_aspect_ratio = (AVRational){1,1};
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outlink->frame_rate = av_div_q((AVRational){inlink->sample_rate,showwaves->n},
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(AVRational){showwaves->w,1});
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av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d r:%f n:%d\n",
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showwaves->w, showwaves->h, av_q2d(outlink->frame_rate), showwaves->n);
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return 0;
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}
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inline static int push_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *inlink = ctx->inputs[0];
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ShowWavesContext *showwaves = outlink->src->priv;
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int nb_channels = inlink->channels;
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int ret, i;
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if ((ret = ff_filter_frame(outlink, showwaves->outpicref)) >= 0)
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showwaves->req_fullfilled = 1;
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showwaves->outpicref = NULL;
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showwaves->buf_idx = 0;
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for (i = 0; i < nb_channels; i++)
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showwaves->buf_idy[i] = 0;
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return ret;
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}
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static int push_single_pic(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *inlink = ctx->inputs[0];
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ShowWavesContext *showwaves = ctx->priv;
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int64_t n = 0, max_samples = showwaves->total_samples / outlink->w;
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AVFrame *out = showwaves->outpicref;
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struct frame_node *node;
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const int nb_channels = inlink->channels;
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const int x = 255 / (showwaves->split_channels ? 1 : nb_channels);
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const int ch_height = showwaves->split_channels ? outlink->h / nb_channels : outlink->h;
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const int linesize = out->linesize[0];
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int col = 0;
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int64_t *sum = showwaves->sum;
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if (max_samples == 0) {
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av_log(ctx, AV_LOG_ERROR, "Too few samples\n");
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return AVERROR(EINVAL);
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}
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av_log(ctx, AV_LOG_DEBUG, "Create frame averaging %"PRId64" samples per column\n", max_samples);
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memset(sum, 0, nb_channels);
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for (node = showwaves->audio_frames; node; node = node->next) {
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int i;
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const AVFrame *frame = node->frame;
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const int16_t *p = (const int16_t *)frame->data[0];
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for (i = 0; i < frame->nb_samples; i++) {
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int ch;
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for (ch = 0; ch < nb_channels; ch++)
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sum[ch] += abs(p[ch + i*nb_channels]) << 1;
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if (n++ == max_samples) {
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for (ch = 0; ch < nb_channels; ch++) {
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int16_t sample = sum[ch] / max_samples;
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uint8_t *buf = out->data[0] + col;
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if (showwaves->split_channels)
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buf += ch*ch_height*linesize;
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av_assert0(col < outlink->w);
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showwaves->draw_sample(buf, ch_height, linesize, sample, &showwaves->buf_idy[ch], x);
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sum[ch] = 0;
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}
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col++;
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n = 0;
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}
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}
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}
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return push_frame(outlink);
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}
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static int request_frame(AVFilterLink *outlink)
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{
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ShowWavesContext *showwaves = outlink->src->priv;
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AVFilterLink *inlink = outlink->src->inputs[0];
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int ret;
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showwaves->req_fullfilled = 0;
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do {
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ret = ff_request_frame(inlink);
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} while (!showwaves->req_fullfilled && ret >= 0);
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if (ret == AVERROR_EOF && showwaves->outpicref) {
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if (showwaves->single_pic)
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push_single_pic(outlink);
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else
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push_frame(outlink);
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}
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return ret;
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}
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static void draw_sample_point(uint8_t *buf, int height, int linesize,
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int16_t sample, int16_t *prev_y, int intensity)
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{
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const int h = height/2 - av_rescale(sample, height/2, INT16_MAX);
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if (h >= 0 && h < height)
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buf[h * linesize] += intensity;
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}
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static void draw_sample_line(uint8_t *buf, int height, int linesize,
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int16_t sample, int16_t *prev_y, int intensity)
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{
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int k;
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const int h = height/2 - av_rescale(sample, height/2, INT16_MAX);
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int start = height/2;
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int end = av_clip(h, 0, height-1);
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if (start > end)
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FFSWAP(int16_t, start, end);
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for (k = start; k < end; k++)
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buf[k * linesize] += intensity;
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}
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static void draw_sample_p2p(uint8_t *buf, int height, int linesize,
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int16_t sample, int16_t *prev_y, int intensity)
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{
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int k;
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const int h = height/2 - av_rescale(sample, height/2, INT16_MAX);
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if (h >= 0 && h < height) {
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buf[h * linesize] += intensity;
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if (*prev_y && h != *prev_y) {
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int start = *prev_y;
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int end = av_clip(h, 0, height-1);
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if (start > end)
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FFSWAP(int16_t, start, end);
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for (k = start + 1; k < end; k++)
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buf[k * linesize] += intensity;
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}
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}
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*prev_y = h;
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}
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static void draw_sample_cline(uint8_t *buf, int height, int linesize,
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int16_t sample, int16_t *prev_y, int intensity)
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{
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int k;
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const int h = av_rescale(abs(sample), height, INT16_MAX);
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const int start = (height - h) / 2;
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const int end = start + h;
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for (k = start; k < end; k++)
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buf[k * linesize] += intensity;
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}
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static int alloc_out_frame(ShowWavesContext *showwaves, const int16_t *p,
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const AVFilterLink *inlink, AVFilterLink *outlink,
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const AVFrame *in)
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{
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if (!showwaves->outpicref) {
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int j;
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AVFrame *out = showwaves->outpicref =
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ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out)
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return AVERROR(ENOMEM);
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out->width = outlink->w;
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out->height = outlink->h;
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out->pts = in->pts + av_rescale_q((p - (int16_t *)in->data[0]) / inlink->channels,
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av_make_q(1, inlink->sample_rate),
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outlink->time_base);
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for (j = 0; j < outlink->h; j++)
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memset(out->data[0] + j*out->linesize[0], 0, outlink->w);
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}
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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ShowWavesContext *showwaves = ctx->priv;
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if (!strcmp(ctx->filter->name, "showwavespic")) {
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showwaves->single_pic = 1;
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showwaves->mode = MODE_CENTERED_LINE;
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}
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switch (showwaves->mode) {
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case MODE_POINT: showwaves->draw_sample = draw_sample_point; break;
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case MODE_LINE: showwaves->draw_sample = draw_sample_line; break;
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case MODE_P2P: showwaves->draw_sample = draw_sample_p2p; break;
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case MODE_CENTERED_LINE: showwaves->draw_sample = draw_sample_cline; break;
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default:
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return AVERROR_BUG;
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}
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return 0;
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}
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#if CONFIG_SHOWWAVES_FILTER
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static int showwaves_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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ShowWavesContext *showwaves = ctx->priv;
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const int nb_samples = insamples->nb_samples;
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AVFrame *outpicref = showwaves->outpicref;
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int16_t *p = (int16_t *)insamples->data[0];
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int nb_channels = inlink->channels;
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int i, j, ret = 0;
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const int n = showwaves->n;
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const int x = 255 / ((showwaves->split_channels ? 1 : nb_channels) * n); /* multiplication factor, pre-computed to avoid in-loop divisions */
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const int ch_height = showwaves->split_channels ? outlink->h / nb_channels : outlink->h;
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/* draw data in the buffer */
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for (i = 0; i < nb_samples; i++) {
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ret = alloc_out_frame(showwaves, p, inlink, outlink, insamples);
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if (ret < 0)
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goto end;
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outpicref = showwaves->outpicref;
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for (j = 0; j < nb_channels; j++) {
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uint8_t *buf = outpicref->data[0] + showwaves->buf_idx;
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const int linesize = outpicref->linesize[0];
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if (showwaves->split_channels)
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buf += j*ch_height*linesize;
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showwaves->draw_sample(buf, ch_height, linesize, *p++,
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&showwaves->buf_idy[j], x);
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}
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showwaves->sample_count_mod++;
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if (showwaves->sample_count_mod == n) {
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showwaves->sample_count_mod = 0;
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showwaves->buf_idx++;
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}
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if (showwaves->buf_idx == showwaves->w)
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if ((ret = push_frame(outlink)) < 0)
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break;
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outpicref = showwaves->outpicref;
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}
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end:
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av_frame_free(&insamples);
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return ret;
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}
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static const AVFilterPad showwaves_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = showwaves_filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad showwaves_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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.request_frame = request_frame,
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},
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{ NULL }
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};
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AVFilter ff_avf_showwaves = {
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.name = "showwaves",
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.description = NULL_IF_CONFIG_SMALL("Convert input audio to a 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(ShowWavesContext),
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.inputs = showwaves_inputs,
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.outputs = showwaves_outputs,
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.priv_class = &showwaves_class,
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};
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#endif // CONFIG_SHOWWAVES_FILTER
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#if CONFIG_SHOWWAVESPIC_FILTER
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#define OFFSET(x) offsetof(ShowWavesContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption showwavespic_options[] = {
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{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
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{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
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{ "split_channels", "draw channels separately", OFFSET(split_channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(showwavespic);
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static int showwavespic_config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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ShowWavesContext *showwaves = ctx->priv;
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if (showwaves->single_pic) {
|
|
showwaves->sum = av_mallocz_array(inlink->channels, sizeof(*showwaves->sum));
|
|
if (!showwaves->sum)
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int showwavespic_filter_frame(AVFilterLink *inlink, AVFrame *insamples)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
ShowWavesContext *showwaves = ctx->priv;
|
|
int16_t *p = (int16_t *)insamples->data[0];
|
|
int ret = 0;
|
|
|
|
if (showwaves->single_pic) {
|
|
struct frame_node *f;
|
|
|
|
ret = alloc_out_frame(showwaves, p, inlink, outlink, insamples);
|
|
if (ret < 0)
|
|
goto end;
|
|
|
|
/* queue the audio frame */
|
|
f = av_malloc(sizeof(*f));
|
|
if (!f) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto end;
|
|
}
|
|
f->frame = insamples;
|
|
f->next = NULL;
|
|
if (!showwaves->last_frame) {
|
|
showwaves->audio_frames =
|
|
showwaves->last_frame = f;
|
|
} else {
|
|
showwaves->last_frame->next = f;
|
|
showwaves->last_frame = f;
|
|
}
|
|
showwaves->total_samples += insamples->nb_samples;
|
|
|
|
return 0;
|
|
}
|
|
|
|
end:
|
|
av_frame_free(&insamples);
|
|
return ret;
|
|
}
|
|
|
|
static const AVFilterPad showwavespic_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = showwavespic_config_input,
|
|
.filter_frame = showwavespic_filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad showwavespic_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_output,
|
|
.request_frame = request_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_avf_showwavespic = {
|
|
.name = "showwavespic",
|
|
.description = NULL_IF_CONFIG_SMALL("Convert input audio to a video output single picture."),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
.priv_size = sizeof(ShowWavesContext),
|
|
.inputs = showwavespic_inputs,
|
|
.outputs = showwavespic_outputs,
|
|
.priv_class = &showwavespic_class,
|
|
};
|
|
|
|
#endif // CONFIG_SHOWWAVESPIC_FILTER
|