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Pretty RDFT audio visualization. 

Originally committed as revision 21639 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2010-02-05 02:06:38 +00:00
parent d52ec0029b
commit 12eeda342a
1 changed files with 51 additions and 2 deletions
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53
ffplay.c
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@ -30,6 +30,7 @@
#include "libavcodec/audioconvert.h"
#include "libavcodec/colorspace.h"
#include "libavcodec/opt.h"
#include "libavcodec/dsputil.h"
#include "cmdutils.h"
@ -151,6 +152,9 @@ typedef struct VideoState {
int16_t sample_array[SAMPLE_ARRAY_SIZE];
int sample_array_index;
int last_i_start;
RDFTContext rdft;
int rdft_bits;
int xpos;
SDL_Thread *subtitle_tid;
int subtitle_stream;
@ -799,7 +803,7 @@ static void video_audio_display(VideoState *s)
delay = s->width;
i_start= x = compute_mod(s->sample_array_index - delay * channels, SAMPLE_ARRAY_SIZE);
if(s->show_audio==1){
h= INT_MIN;
for(i=0; i<1000; i+=channels){
int idx= (SAMPLE_ARRAY_SIZE + x - i) % SAMPLE_ARRAY_SIZE;
@ -813,6 +817,7 @@ static void video_audio_display(VideoState *s)
i_start= idx;
}
}
}
s->last_i_start = i_start;
} else {
@ -820,6 +825,7 @@ static void video_audio_display(VideoState *s)
}
bgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
if(s->show_audio==1){
fill_rectangle(screen,
s->xleft, s->ytop, s->width, s->height,
bgcolor);
@ -859,6 +865,49 @@ static void video_audio_display(VideoState *s)
fgcolor);
}
SDL_UpdateRect(screen, s->xleft, s->ytop, s->width, s->height);
}else{
int rdft_bits, nb_freq;
nb_display_channels= FFMIN(nb_display_channels, 2);
for(rdft_bits=1; (1<<rdft_bits)<=s->height; rdft_bits++)
;
if(rdft_bits != s->rdft_bits){
ff_rdft_end(&s->rdft);
ff_rdft_init(&s->rdft, rdft_bits, RDFT);
s->rdft_bits= rdft_bits;
}
nb_freq= 1<<(rdft_bits-1);
{
FFTSample data[2][2*nb_freq];
for(ch = 0;ch < nb_display_channels; ch++) {
i = i_start + ch;
for(x = 0; x < 2*nb_freq; x++) {
double w= (x-nb_freq)*(1.0/nb_freq);
data[ch][x]= s->sample_array[i]*(1.0-w*w);
i += channels;
if (i >= SAMPLE_ARRAY_SIZE)
i -= SAMPLE_ARRAY_SIZE;
}
ff_rdft_calc(&s->rdft, data[ch]);
}
//least efficient way to do this, we should of course directly access it but its more than fast enough
for(y=0; y<nb_freq; y++){
double w= 1/sqrt(nb_freq);
int a= sqrt(w*sqrt(data[0][2*y+0]*data[0][2*y+0] + data[0][2*y+1]*data[0][2*y+1]));
int b= sqrt(w*sqrt(data[1][2*y+0]*data[1][2*y+0] + data[1][2*y+1]*data[1][2*y+1]));
a= FFMIN(a,255);
b= FFMIN(b,255);
fgcolor = SDL_MapRGB(screen->format, a, b, (a+b)/2);
fill_rectangle(screen,
s->xpos, s->height-y, 1, 1,
fgcolor);
}
}
SDL_UpdateRect(screen, s->xpos, s->ytop, 1, s->height);
s->xpos++;
if(s->xpos >= s->width)
s->xpos= s->xleft;
}
}
static int video_open(VideoState *is){
@ -2312,7 +2361,7 @@ static void toggle_audio_display(void)
{
if (cur_stream) {
int bgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
cur_stream->show_audio = !cur_stream->show_audio;
cur_stream->show_audio = (cur_stream->show_audio + 1) % 3;
fill_rectangle(screen,
cur_stream->xleft, cur_stream->ytop, cur_stream->width, cur_stream->height,
bgcolor);