/* * Copyright (c) 2012 Stefano Sabatini * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * audio to video multimedia filter */ #include "libavutil/channel_layout.h" #include "libavutil/opt.h" #include "libavutil/parseutils.h" #include "avfilter.h" #include "formats.h" #include "audio.h" #include "video.h" #include "internal.h" enum ShowWavesMode { MODE_POINT, MODE_LINE, MODE_NB, }; typedef struct { const AVClass *class; int w, h; AVRational rate; int buf_idx; AVFrame *outpicref; int req_fullfilled; int n; int sample_count_mod; enum ShowWavesMode mode; } ShowWavesContext; #define OFFSET(x) offsetof(ShowWavesContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static const AVOption showwaves_options[] = { { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS }, { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS }, { "mode", "select display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_POINT}, 0, MODE_NB-1, FLAGS, "mode"}, { "point", "draw a point for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_POINT}, .flags=FLAGS, .unit="mode"}, { "line", "draw a line for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_LINE}, .flags=FLAGS, .unit="mode"}, { "n", "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS }, { "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS }, { "r", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS }, { NULL } }; AVFILTER_DEFINE_CLASS(showwaves); static av_cold void uninit(AVFilterContext *ctx) { ShowWavesContext *showwaves = ctx->priv; av_frame_free(&showwaves->outpicref); } static int query_formats(AVFilterContext *ctx) { AVFilterFormats *formats = NULL; AVFilterChannelLayouts *layouts = NULL; AVFilterLink *inlink = ctx->inputs[0]; AVFilterLink *outlink = ctx->outputs[0]; static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE }; static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE }; /* set input audio formats */ formats = ff_make_format_list(sample_fmts); if (!formats) return AVERROR(ENOMEM); ff_formats_ref(formats, &inlink->out_formats); layouts = ff_all_channel_layouts(); if (!layouts) return AVERROR(ENOMEM); ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts); formats = ff_all_samplerates(); if (!formats) return AVERROR(ENOMEM); ff_formats_ref(formats, &inlink->out_samplerates); /* set output video format */ formats = ff_make_format_list(pix_fmts); if (!formats) return AVERROR(ENOMEM); ff_formats_ref(formats, &outlink->in_formats); return 0; } static int config_output(AVFilterLink *outlink) { AVFilterContext *ctx = outlink->src; AVFilterLink *inlink = ctx->inputs[0]; ShowWavesContext *showwaves = ctx->priv; if (!showwaves->n) showwaves->n = FFMAX(1, ((double)inlink->sample_rate / (showwaves->w * av_q2d(showwaves->rate))) + 0.5); showwaves->buf_idx = 0; outlink->w = showwaves->w; outlink->h = showwaves->h; outlink->sample_aspect_ratio = (AVRational){1,1}; outlink->frame_rate = av_div_q((AVRational){inlink->sample_rate,showwaves->n}, (AVRational){showwaves->w,1}); av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d r:%f n:%d\n", showwaves->w, showwaves->h, av_q2d(outlink->frame_rate), showwaves->n); return 0; } inline static int push_frame(AVFilterLink *outlink) { ShowWavesContext *showwaves = outlink->src->priv; int ret; if ((ret = ff_filter_frame(outlink, showwaves->outpicref)) >= 0) showwaves->req_fullfilled = 1; showwaves->outpicref = NULL; showwaves->buf_idx = 0; return ret; } static int request_frame(AVFilterLink *outlink) { ShowWavesContext *showwaves = outlink->src->priv; AVFilterLink *inlink = outlink->src->inputs[0]; int ret; showwaves->req_fullfilled = 0; do { ret = ff_request_frame(inlink); } while (!showwaves->req_fullfilled && ret >= 0); if (ret == AVERROR_EOF && showwaves->outpicref) push_frame(outlink); return ret; } #define MAX_INT16 ((1<<15) -1) static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) { AVFilterContext *ctx = inlink->dst; AVFilterLink *outlink = ctx->outputs[0]; ShowWavesContext *showwaves = ctx->priv; const int nb_samples = insamples->nb_samples; AVFrame *outpicref = showwaves->outpicref; int linesize = outpicref ? outpicref->linesize[0] : 0; int16_t *p = (int16_t *)insamples->data[0]; int nb_channels = inlink->channels; int i, j, k, h, ret = 0; const int n = showwaves->n; const int x = 255 / (nb_channels * n); /* multiplication factor, pre-computed to avoid in-loop divisions */ /* draw data in the buffer */ for (i = 0; i < nb_samples; i++) { if (!showwaves->outpicref) { showwaves->outpicref = outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h); if (!outpicref) return AVERROR(ENOMEM); outpicref->width = outlink->w; outpicref->height = outlink->h; outpicref->pts = insamples->pts + av_rescale_q((p - (int16_t *)insamples->data[0]) / nb_channels, (AVRational){ 1, inlink->sample_rate }, outlink->time_base); linesize = outpicref->linesize[0]; for (j = 0; j < outlink->h; j++) memset(outpicref->data[0] + j * linesize, 0, outlink->w); } for (j = 0; j < nb_channels; j++) { h = showwaves->h/2 - av_rescale(*p++, showwaves->h/2, MAX_INT16); switch (showwaves->mode) { case MODE_POINT: if (h >= 0 && h < outlink->h) *(outpicref->data[0] + showwaves->buf_idx + h * linesize) += x; break; case MODE_LINE: { int start = showwaves->h/2, end = av_clip(h, 0, outlink->h-1); if (start > end) FFSWAP(int16_t, start, end); for (k = start; k < end; k++) *(outpicref->data[0] + showwaves->buf_idx + k * linesize) += x; break; } } } showwaves->sample_count_mod++; if (showwaves->sample_count_mod == n) { showwaves->sample_count_mod = 0; showwaves->buf_idx++; } if (showwaves->buf_idx == showwaves->w) if ((ret = push_frame(outlink)) < 0) break; outpicref = showwaves->outpicref; } av_frame_free(&insamples); return ret; } static const AVFilterPad showwaves_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_AUDIO, .filter_frame = filter_frame, }, { NULL } }; static const AVFilterPad showwaves_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .config_props = config_output, .request_frame = request_frame, }, { NULL } }; AVFilter ff_avf_showwaves = { .name = "showwaves", .description = NULL_IF_CONFIG_SMALL("Convert input audio to a video output."), .uninit = uninit, .query_formats = query_formats, .priv_size = sizeof(ShowWavesContext), .inputs = showwaves_inputs, .outputs = showwaves_outputs, .priv_class = &showwaves_class, };