yading@10: /*
yading@10:  * Copyright (c) 2012 Stefano Sabatini
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * audio to video multimedia filter
yading@10:  */
yading@10: 
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/parseutils.h"
yading@10: #include "avfilter.h"
yading@10: #include "formats.h"
yading@10: #include "audio.h"
yading@10: #include "video.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: enum ShowWavesMode {
yading@10:     MODE_POINT,
yading@10:     MODE_LINE,
yading@10:     MODE_NB,
yading@10: };
yading@10: 
yading@10: typedef struct {
yading@10:     const AVClass *class;
yading@10:     int w, h;
yading@10:     AVRational rate;
yading@10:     int buf_idx;
yading@10:     AVFrame *outpicref;
yading@10:     int req_fullfilled;
yading@10:     int n;
yading@10:     int sample_count_mod;
yading@10:     enum ShowWavesMode mode;
yading@10: } ShowWavesContext;
yading@10: 
yading@10: #define OFFSET(x) offsetof(ShowWavesContext, x)
yading@10: #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
yading@10: 
yading@10: static const AVOption showwaves_options[] = {
yading@10:     { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
yading@10:     { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
yading@10:     { "mode", "select display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_POINT}, 0, MODE_NB-1, FLAGS, "mode"},
yading@10:         { "point", "draw a point for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_POINT}, .flags=FLAGS, .unit="mode"},
yading@10:         { "line",  "draw a line for each sample",  0, AV_OPT_TYPE_CONST, {.i64=MODE_LINE},  .flags=FLAGS, .unit="mode"},
yading@10:     { "n",    "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
yading@10:     { "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
yading@10:     { "r",    "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: AVFILTER_DEFINE_CLASS(showwaves);
yading@10: 
yading@10: static av_cold void uninit(AVFilterContext *ctx)
yading@10: {
yading@10:     ShowWavesContext *showwaves = ctx->priv;
yading@10: 
yading@10:     av_frame_free(&showwaves->outpicref);
yading@10: }
yading@10: 
yading@10: static int query_formats(AVFilterContext *ctx)
yading@10: {
yading@10:     AVFilterFormats *formats = NULL;
yading@10:     AVFilterChannelLayouts *layouts = NULL;
yading@10:     AVFilterLink *inlink = ctx->inputs[0];
yading@10:     AVFilterLink *outlink = ctx->outputs[0];
yading@10:     static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE };
yading@10:     static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
yading@10: 
yading@10:     /* set input audio formats */
yading@10:     formats = ff_make_format_list(sample_fmts);
yading@10:     if (!formats)
yading@10:         return AVERROR(ENOMEM);
yading@10:     ff_formats_ref(formats, &inlink->out_formats);
yading@10: 
yading@10:     layouts = ff_all_channel_layouts();
yading@10:     if (!layouts)
yading@10:         return AVERROR(ENOMEM);
yading@10:     ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
yading@10: 
yading@10:     formats = ff_all_samplerates();
yading@10:     if (!formats)
yading@10:         return AVERROR(ENOMEM);
yading@10:     ff_formats_ref(formats, &inlink->out_samplerates);
yading@10: 
yading@10:     /* set output video format */
yading@10:     formats = ff_make_format_list(pix_fmts);
yading@10:     if (!formats)
yading@10:         return AVERROR(ENOMEM);
yading@10:     ff_formats_ref(formats, &outlink->in_formats);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int config_output(AVFilterLink *outlink)
yading@10: {
yading@10:     AVFilterContext *ctx = outlink->src;
yading@10:     AVFilterLink *inlink = ctx->inputs[0];
yading@10:     ShowWavesContext *showwaves = ctx->priv;
yading@10: 
yading@10:     if (!showwaves->n)
yading@10:         showwaves->n = FFMAX(1, ((double)inlink->sample_rate / (showwaves->w * av_q2d(showwaves->rate))) + 0.5);
yading@10: 
yading@10:     showwaves->buf_idx = 0;
yading@10:     outlink->w = showwaves->w;
yading@10:     outlink->h = showwaves->h;
yading@10:     outlink->sample_aspect_ratio = (AVRational){1,1};
yading@10: 
yading@10:     outlink->frame_rate = av_div_q((AVRational){inlink->sample_rate,showwaves->n},
yading@10:                                    (AVRational){showwaves->w,1});
yading@10: 
yading@10:     av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d r:%f n:%d\n",
yading@10:            showwaves->w, showwaves->h, av_q2d(outlink->frame_rate), showwaves->n);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: inline static int push_frame(AVFilterLink *outlink)
yading@10: {
yading@10:     ShowWavesContext *showwaves = outlink->src->priv;
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = ff_filter_frame(outlink, showwaves->outpicref)) >= 0)
yading@10:         showwaves->req_fullfilled = 1;
yading@10:     showwaves->outpicref = NULL;
yading@10:     showwaves->buf_idx = 0;
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int request_frame(AVFilterLink *outlink)
yading@10: {
yading@10:     ShowWavesContext *showwaves = outlink->src->priv;
yading@10:     AVFilterLink *inlink = outlink->src->inputs[0];
yading@10:     int ret;
yading@10: 
yading@10:     showwaves->req_fullfilled = 0;
yading@10:     do {
yading@10:         ret = ff_request_frame(inlink);
yading@10:     } while (!showwaves->req_fullfilled && ret >= 0);
yading@10: 
yading@10:     if (ret == AVERROR_EOF && showwaves->outpicref)
yading@10:         push_frame(outlink);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: #define MAX_INT16 ((1<<15) -1)
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
yading@10: {
yading@10:     AVFilterContext *ctx = inlink->dst;
yading@10:     AVFilterLink *outlink = ctx->outputs[0];
yading@10:     ShowWavesContext *showwaves = ctx->priv;
yading@10:     const int nb_samples = insamples->nb_samples;
yading@10:     AVFrame *outpicref = showwaves->outpicref;
yading@10:     int linesize = outpicref ? outpicref->linesize[0] : 0;
yading@10:     int16_t *p = (int16_t *)insamples->data[0];
yading@10:     int nb_channels = av_get_channel_layout_nb_channels(insamples->channel_layout);
yading@10:     int i, j, k, h, ret = 0;
yading@10:     const int n = showwaves->n;
yading@10:     const int x = 255 / (nb_channels * n); /* multiplication factor, pre-computed to avoid in-loop divisions */
yading@10: 
yading@10:     /* draw data in the buffer */
yading@10:     for (i = 0; i < nb_samples; i++) {
yading@10:         if (!showwaves->outpicref) {
yading@10:             showwaves->outpicref = outpicref =
yading@10:                 ff_get_video_buffer(outlink, outlink->w, outlink->h);
yading@10:             if (!outpicref)
yading@10:                 return AVERROR(ENOMEM);
yading@10:             outpicref->width  = outlink->w;
yading@10:             outpicref->height = outlink->h;
yading@10:             outpicref->pts = insamples->pts +
yading@10:                              av_rescale_q((p - (int16_t *)insamples->data[0]) / nb_channels,
yading@10:                                           (AVRational){ 1, inlink->sample_rate },
yading@10:                                           outlink->time_base);
yading@10:             linesize = outpicref->linesize[0];
yading@10:             memset(outpicref->data[0], 0, showwaves->h*linesize);
yading@10:         }
yading@10:         for (j = 0; j < nb_channels; j++) {
yading@10:             h = showwaves->h/2 - av_rescale(*p++, showwaves->h/2, MAX_INT16);
yading@10:             switch (showwaves->mode) {
yading@10:             case MODE_POINT:
yading@10:                 if (h >= 0 && h < outlink->h)
yading@10:                     *(outpicref->data[0] + showwaves->buf_idx + h * linesize) += x;
yading@10:                 break;
yading@10: 
yading@10:             case MODE_LINE:
yading@10:             {
yading@10:                 int start = showwaves->h/2, end = av_clip(h, 0, outlink->h-1);
yading@10:                 if (start > end) FFSWAP(int16_t, start, end);
yading@10:                 for (k = start; k < end; k++)
yading@10:                     *(outpicref->data[0] + showwaves->buf_idx + k * linesize) += x;
yading@10:                 break;
yading@10:             }
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         showwaves->sample_count_mod++;
yading@10:         if (showwaves->sample_count_mod == n) {
yading@10:             showwaves->sample_count_mod = 0;
yading@10:             showwaves->buf_idx++;
yading@10:         }
yading@10:         if (showwaves->buf_idx == showwaves->w)
yading@10:             if ((ret = push_frame(outlink)) < 0)
yading@10:                 break;
yading@10:         outpicref = showwaves->outpicref;
yading@10:     }
yading@10: 
yading@10:     av_frame_free(&insamples);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static const AVFilterPad showwaves_inputs[] = {
yading@10:     {
yading@10:         .name         = "default",
yading@10:         .type         = AVMEDIA_TYPE_AUDIO,
yading@10:         .filter_frame = filter_frame,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVFilterPad showwaves_outputs[] = {
yading@10:     {
yading@10:         .name          = "default",
yading@10:         .type          = AVMEDIA_TYPE_VIDEO,
yading@10:         .config_props  = config_output,
yading@10:         .request_frame = request_frame,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_avf_showwaves = {
yading@10:     .name           = "showwaves",
yading@10:     .description    = NULL_IF_CONFIG_SMALL("Convert input audio to a video output."),
yading@10:     .uninit         = uninit,
yading@10:     .query_formats  = query_formats,
yading@10:     .priv_size      = sizeof(ShowWavesContext),
yading@10:     .inputs         = showwaves_inputs,
yading@10:     .outputs        = showwaves_outputs,
yading@10:     .priv_class     = &showwaves_class,
yading@10: };