summaryrefslogtreecommitdiff
path: root/libavfilter/avf_showwaves.c
diff options
context:
space:
mode:
Diffstat (limited to 'libavfilter/avf_showwaves.c')
-rw-r--r--libavfilter/avf_showwaves.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/libavfilter/avf_showwaves.c b/libavfilter/avf_showwaves.c
new file mode 100644
index 0000000000..0b45bd070f
--- /dev/null
+++ b/libavfilter/avf_showwaves.c
@@ -0,0 +1,256 @@
+/*
+ * 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,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 16:25:40 +0000