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avfilter/showcqt: adding freetype support 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
tags/n2.3
Muhammad Faiz Michael Niedermayer 11 years ago
parent
9efa7f82ce
commit
46563af79c
2 changed files with 154 additions and 29 deletions
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  1. +3
    -0
      doc/filters.texi
  2. +151
    -29
      libavfilter/avf_showcqt.c

+ 3
- 0
doc/filters.texi View File

@@ -10430,6 +10430,9 @@ Specify gamma. Lower gamma makes the spectrum more contrast, higher gamma
makes the spectrum having more range. Acceptable value is [1.0, 7.0].
Default value is @code{3.0}.

@item fontfile
Specify font file for use with freetype. If not specified, use embedded font.

@item fullhd
If set to 1 (the default), the video size is 1920x1080 (full HD),
if set to 0, the video size is 960x540. Use this option to make CPU usage lower.


+ 151
- 29
libavfilter/avf_showcqt.c View File

@@ -18,6 +18,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include "config.h"
#include "libavcodec/avfft.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
@@ -31,6 +32,11 @@
#include <math.h>
#include <stdlib.h>

#if CONFIG_LIBFREETYPE
#include <ft2build.h>
#include FT_FREETYPE_H
#endif

/* this filter is designed to do 16 bins/semitones constant Q transform with Brown-Puckette algorithm
* start from E0 to D#10 (10 octaves)
* so there are 16 bins/semitones * 12 semitones/octaves * 10 octaves = 1920 bins
@@ -59,6 +65,8 @@ typedef struct {
uint8_t *spectogram;
SparseCoeff *coeff_sort;
SparseCoeff *coeffs[VIDEO_WIDTH];
uint8_t *font_alpha;
char *fontfile; /* using freetype */
int coeffs_len[VIDEO_WIDTH];
uint8_t font_color[VIDEO_WIDTH];
int64_t frame_count;
@@ -87,6 +95,7 @@ static const AVOption showcqt_options[] = {
{ "fullhd", "set full HD resolution", OFFSET(fullhd), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS },
{ "fps", "set video fps", OFFSET(fps), AV_OPT_TYPE_INT, { .i64 = 25 }, 10, 100, FLAGS },
{ "count", "set number of transform per frame", OFFSET(count), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 30, FLAGS },
{ "fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS },
{ NULL }
};

@@ -106,6 +115,7 @@ static av_cold void uninit(AVFilterContext *ctx)
av_freep(&s->fft_result_right);
av_freep(&s->coeff_sort);
av_freep(&s->spectogram);
av_freep(&s->font_alpha);
av_frame_free(&s->outpicref);
}

@@ -145,6 +155,97 @@ static int query_formats(AVFilterContext *ctx)
return 0;
}

#if CONFIG_LIBFREETYPE
static void load_freetype_font(AVFilterContext *ctx)
{
static const char str[] = "EF G A BC D ";
ShowCQTContext *s = ctx->priv;
FT_Library lib = NULL;
FT_Face face = NULL;
int video_scale = s->fullhd ? 2 : 1;
int video_width = (VIDEO_WIDTH/2) * video_scale;
int font_height = (FONT_HEIGHT/2) * video_scale;
int font_width = 8 * video_scale;
int font_repeat = font_width * 12;
int linear_hori_advance = font_width * 65536;
int non_monospace_warning = 0;
int x;

s->font_alpha = NULL;

if (!s->fontfile)
return;

if (FT_Init_FreeType(&lib))
goto fail;

if (FT_New_Face(lib, s->fontfile, 0, &face))
goto fail;

if (FT_Set_Char_Size(face, 16*64, 0, 0, 0))
goto fail;

if (FT_Load_Char(face, 'A', FT_LOAD_RENDER))
goto fail;

if (FT_Set_Char_Size(face, 16*64 * linear_hori_advance / face->glyph->linearHoriAdvance, 0, 0, 0))
goto fail;

s->font_alpha = av_malloc(font_height * video_width);
if (!s->font_alpha)
goto fail;

memset(s->font_alpha, 0, font_height * video_width);

for (x = 0; x < 12; x++) {
int sx, sy, rx, bx, by, dx, dy;

if (str[x] == ' ')
continue;

if (FT_Load_Char(face, str[x], FT_LOAD_RENDER))
goto fail;

if (face->glyph->advance.x != font_width*64 && !non_monospace_warning) {
av_log(ctx, AV_LOG_WARNING, "Font is not monospace\n");
non_monospace_warning = 1;
}

sy = font_height - 4*video_scale - face->glyph->bitmap_top;
for (rx = 0; rx < 10; rx++) {
sx = rx * font_repeat + x * font_width + face->glyph->bitmap_left;
for (by = 0; by < face->glyph->bitmap.rows; by++) {
dy = by + sy;
if (dy < 0)
continue;
if (dy >= font_height)
break;

for (bx = 0; bx < face->glyph->bitmap.width; bx++) {
dx = bx + sx;
if (dx < 0)
continue;
if (dx >= video_width)
break;
s->font_alpha[dy*video_width+dx] = face->glyph->bitmap.buffer[by*face->glyph->bitmap.width+bx];
}
}
}
}

FT_Done_Face(face);
FT_Done_FreeType(lib);
return;

fail:
av_log(ctx, AV_LOG_WARNING, "Error while loading freetype font, using default font instead\n");
FT_Done_Face(face);
FT_Done_FreeType(lib);
av_freep(&s->font_alpha);
return;
}
#endif

static inline int qsort_sparsecoeff(const SparseCoeff *a, const SparseCoeff *b)
{
if (fabsf(a->value) >= fabsf(b->value))
@@ -196,6 +297,14 @@ static int config_output(AVFilterLink *outlink)
}
}

#if CONFIG_LIBFREETYPE
load_freetype_font(ctx);
#else
if (s->fontfile)
av_log(ctx, AV_LOG_WARNING, "Freetype is not available, ignoring fontfile option\n");
s->font_alpha = NULL;
#endif

av_log(ctx, AV_LOG_INFO, "Calculating spectral kernel, please wait\n");
start_time = av_gettime_relative();
for (k = 0; k < VIDEO_WIDTH; k++) {
@@ -413,40 +522,53 @@ static int plot_cqt(AVFilterLink *inlink)
}

/* drawing font */
for (y = 0; y < font_height; y++) {
uint8_t *lineptr = data + (spectogram_height + y) * linesize;
memcpy(lineptr, s->spectogram + s->spectogram_index * linesize, video_width*3);
}
for (x = 0; x < video_width; x += video_width/10) {
int u;
static const char str[] = "EF G A BC D ";
uint8_t *startptr = data + spectogram_height * linesize + x * 3;
for (u = 0; str[u]; u++) {
int v;
for (v = 0; v < 16; v++) {
uint8_t *p = startptr + v * linesize * video_scale + 8 * 3 * u * video_scale;
int ux = x + 8 * u * video_scale;
int mask;
for (mask = 0x80; mask; mask >>= 1) {
if (mask & avpriv_vga16_font[str[u] * 16 + v]) {
p[0] = 255 - s->font_color[ux];
p[1] = 0;
p[2] = s->font_color[ux];
if (video_scale == 2) {
p[linesize] = p[0];
p[linesize+1] = p[1];
p[linesize+2] = p[2];
p[3] = p[linesize+3] = 255 - s->font_color[ux+1];
p[4] = p[linesize+4] = 0;
p[5] = p[linesize+5] = s->font_color[ux+1];
if (s->font_alpha) {
for (y = 0; y < font_height; y++) {
uint8_t *lineptr = data + (spectogram_height + y) * linesize;
uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize;
for (x = 0; x < video_width; x++) {
uint8_t alpha = s->font_alpha[y*video_width+x];
uint8_t color = s->font_color[x];
lineptr[3*x] = (spectogram_src[3*x] * (255-alpha) + (255-color) * alpha + 255) >> 8;
lineptr[3*x+1] = (spectogram_src[3*x+1] * (255-alpha) + 255) >> 8;
lineptr[3*x+2] = (spectogram_src[3*x+2] * (255-alpha) + color * alpha + 255) >> 8;
}
}
} else {
for (y = 0; y < font_height; y++) {
uint8_t *lineptr = data + (spectogram_height + y) * linesize;
memcpy(lineptr, s->spectogram + s->spectogram_index * linesize, video_width*3);
}
for (x = 0; x < video_width; x += video_width/10) {
int u;
static const char str[] = "EF G A BC D ";
uint8_t *startptr = data + spectogram_height * linesize + x * 3;
for (u = 0; str[u]; u++) {
int v;
for (v = 0; v < 16; v++) {
uint8_t *p = startptr + v * linesize * video_scale + 8 * 3 * u * video_scale;
int ux = x + 8 * u * video_scale;
int mask;
for (mask = 0x80; mask; mask >>= 1) {
if (mask & avpriv_vga16_font[str[u] * 16 + v]) {
p[0] = 255 - s->font_color[ux];
p[1] = 0;
p[2] = s->font_color[ux];
if (video_scale == 2) {
p[linesize] = p[0];
p[linesize+1] = p[1];
p[linesize+2] = p[2];
p[3] = p[linesize+3] = 255 - s->font_color[ux+1];
p[4] = p[linesize+4] = 0;
p[5] = p[linesize+5] = s->font_color[ux+1];
}
}
p += 3 * video_scale;
ux += video_scale;
}
p += 3 * video_scale;
ux += video_scale;
}
}
}

}

/* drawing spectogram/sonogram */


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