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/*
* 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/avassert.h"
#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_P2P,
MODE_CENTERED_LINE,
MODE_NB,
};
struct frame_node {
AVFrame *frame;
struct frame_node *next;
};
typedef struct {
const AVClass *class;
int w, h;
AVRational rate;
int buf_idx;
int16_t *buf_idy; /* y coordinate of previous sample for each channel */
AVFrame *outpicref;
int req_fullfilled;
int n;
int sample_count_mod;
int mode; ///< ShowWavesMode
int split_channels;
void (*draw_sample)(uint8_t *buf, int height, int linesize,
int16_t sample, int16_t *prev_y, int intensity);
/* single picture */
int single_pic;
struct frame_node *audio_frames;
struct frame_node *last_frame;
int64_t total_samples;
int64_t *sum; /* abs sum of the samples per channel */
} 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"},
{ "p2p", "draw a line between samples", 0, AV_OPT_TYPE_CONST, {.i64=MODE_P2P}, .flags=FLAGS, .unit="mode"},
{ "cline", "draw a centered line for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_CENTERED_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 },
{ "split_channels", "draw channels separately", OFFSET(split_channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(showwaves);
static av_cold void uninit(AVFilterContext *ctx)
{
ShowWavesContext *showwaves = ctx->priv;
av_frame_free(&showwaves->outpicref);
av_freep(&showwaves->buf_idy);
if (showwaves->single_pic) {
struct frame_node *node = showwaves->audio_frames;
while (node) {
struct frame_node *tmp = node;
node = node->next;
av_frame_free(&tmp->frame);
av_freep(&tmp);
}
av_freep(&showwaves->sum);
showwaves->last_frame = NULL;
}
}
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;
int nb_channels = inlink->channels;
if (!showwaves->n)
showwaves->n = FFMAX(1, ((double)inlink->sample_rate / (showwaves->w * av_q2d(showwaves->rate))) + 0.5);
showwaves->buf_idx = 0;
if (!(showwaves->buf_idy = av_mallocz_array(nb_channels, sizeof(*showwaves->buf_idy)))) {
av_log(ctx, AV_LOG_ERROR, "Could not allocate showwaves buffer\n");
return AVERROR(ENOMEM);
}
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)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
ShowWavesContext *showwaves = outlink->src->priv;
int nb_channels = inlink->channels;
int ret, i;
if ((ret = ff_filter_frame(outlink, showwaves->outpicref)) >= 0)
showwaves->req_fullfilled = 1;
showwaves->outpicref = NULL;
showwaves->buf_idx = 0;
for (i = 0; i < nb_channels; i++)
showwaves->buf_idy[i] = 0;
return ret;
}
static int push_single_pic(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
ShowWavesContext *showwaves = ctx->priv;
int64_t n = 0, max_samples = showwaves->total_samples / outlink->w;
AVFrame *out = showwaves->outpicref;
struct frame_node *node;
const int nb_channels = inlink->channels;
const int x = 255 / (showwaves->split_channels ? 1 : nb_channels);
const int ch_height = showwaves->split_channels ? outlink->h / nb_channels : outlink->h;
const int linesize = out->linesize[0];
int col = 0;
int64_t *sum = showwaves->sum;
av_log(ctx, AV_LOG_DEBUG, "Create frame averaging %"PRId64" samples per column\n", max_samples);
memset(sum, 0, nb_channels);
for (node = showwaves->audio_frames; node; node = node->next) {
int i;
const AVFrame *frame = node->frame;
const int16_t *p = (const int16_t *)frame->data[0];
for (i = 0; i < frame->nb_samples; i++) {
int ch;
for (ch = 0; ch < nb_channels; ch++)
sum[ch] += abs(p[ch + i*nb_channels]) << 1;
if (n++ == max_samples) {
for (ch = 0; ch < nb_channels; ch++) {
int16_t sample = sum[ch] / max_samples;
uint8_t *buf = out->data[0] + col;
if (showwaves->split_channels)
buf += ch*ch_height*linesize;
av_assert0(col < outlink->w);
showwaves->draw_sample(buf, ch_height, linesize, sample, &showwaves->buf_idy[ch], x);
sum[ch] = 0;
}
col++;
n = 0;
}
}
}
return push_frame(outlink);
}
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) {
if (showwaves->single_pic)
push_single_pic(outlink);
else
push_frame(outlink);
}
return ret;
}
static void draw_sample_point(uint8_t *buf, int height, int linesize,
int16_t sample, int16_t *prev_y, int intensity)
{
const int h = height/2 - av_rescale(sample, height/2, INT16_MAX);
if (h >= 0 && h < height)
buf[h * linesize] += intensity;
}
static void draw_sample_line(uint8_t *buf, int height, int linesize,
int16_t sample, int16_t *prev_y, int intensity)
{
int k;
const int h = height/2 - av_rescale(sample, height/2, INT16_MAX);
int start = height/2;
int end = av_clip(h, 0, height-1);
if (start > end)
FFSWAP(int16_t, start, end);
for (k = start; k < end; k++)
buf[k * linesize] += intensity;
}
static void draw_sample_p2p(uint8_t *buf, int height, int linesize,
int16_t sample, int16_t *prev_y, int intensity)
{
int k;
const int h = height/2 - av_rescale(sample, height/2, INT16_MAX);
if (h >= 0 && h < height) {
buf[h * linesize] += intensity;
if (*prev_y && h != *prev_y) {
int start = *prev_y;
int end = av_clip(h, 0, height-1);
if (start > end)
FFSWAP(int16_t, start, end);
for (k = start + 1; k < end; k++)
buf[k * linesize] += intensity;
}
}
*prev_y = h;
}
static void draw_sample_cline(uint8_t *buf, int height, int linesize,
int16_t sample, int16_t *prev_y, int intensity)
{
int k;
const int h = av_rescale(abs(sample), height, INT16_MAX);
const int start = (height - h) / 2;
const int end = start + h;
for (k = start; k < end; k++)
buf[k * linesize] += intensity;
}
static int alloc_out_frame(ShowWavesContext *showwaves, const int16_t *p,
const AVFilterLink *inlink, AVFilterLink *outlink,
const AVFrame *in)
{
if (!showwaves->outpicref) {
int j;
AVFrame *out = showwaves->outpicref =
ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
out->width = outlink->w;
out->height = outlink->h;
out->pts = in->pts + av_rescale_q((p - (int16_t *)in->data[0]) / inlink->channels,
av_make_q(1, inlink->sample_rate),
outlink->time_base);
for (j = 0; j < outlink->h; j++)
memset(out->data[0] + j*out->linesize[0], 0, outlink->w);
}
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
ShowWavesContext *showwaves = ctx->priv;
if (!strcmp(ctx->filter->name, "showwavespic")) {
showwaves->single_pic = 1;
showwaves->mode = MODE_CENTERED_LINE;
}
switch (showwaves->mode) {
case MODE_POINT: showwaves->draw_sample = draw_sample_point; break;
case MODE_LINE: showwaves->draw_sample = draw_sample_line; break;
case MODE_P2P: showwaves->draw_sample = draw_sample_p2p; break;
case MODE_CENTERED_LINE: showwaves->draw_sample = draw_sample_cline; break;
default:
return AVERROR_BUG;
}
return 0;
}
#if CONFIG_SHOWWAVES_FILTER
static int showwaves_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;
int16_t *p = (int16_t *)insamples->data[0];
int nb_channels = inlink->channels;
int i, j, ret = 0;
const int n = showwaves->n;
const int x = 255 / ((showwaves->split_channels ? 1 : nb_channels) * n); /* multiplication factor, pre-computed to avoid in-loop divisions */
const int ch_height = showwaves->split_channels ? outlink->h / nb_channels : outlink->h;
/* draw data in the buffer */
for (i = 0; i < nb_samples; i++) {
ret = alloc_out_frame(showwaves, p, inlink, outlink, insamples);
if (ret < 0)
goto end;
outpicref = showwaves->outpicref;
for (j = 0; j < nb_channels; j++) {
uint8_t *buf = outpicref->data[0] + showwaves->buf_idx;
const int linesize = outpicref->linesize[0];
if (showwaves->split_channels)
buf += j*ch_height*linesize;
showwaves->draw_sample(buf, ch_height, linesize, *p++,
&showwaves->buf_idy[j], x);
}
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;
}
end:
av_frame_free(&insamples);
return ret;
}
static const AVFilterPad showwaves_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = showwaves_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."),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.priv_size = sizeof(ShowWavesContext),
.inputs = showwaves_inputs,
.outputs = showwaves_outputs,
.priv_class = &showwaves_class,
};
#endif // CONFIG_SHOWWAVES_FILTER
#if CONFIG_SHOWWAVESPIC_FILTER
#define OFFSET(x) offsetof(ShowWavesContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption showwavespic_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 },
{ "split_channels", "draw channels separately", OFFSET(split_channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(showwavespic);
static int showwavespic_config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
ShowWavesContext *showwaves = ctx->priv;
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
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