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avfilter/avf_showcqt: render default font at 960x16 

and let ffmpeg scaler scale it
this impoves quality

Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
This commit is contained in:
Muhammad Faiz 2016-06-02 16:10:47 +07:00
parent 958bf659d8
commit 1e6a0c9d14
1 changed files with 24 additions and 19 deletions
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43
libavfilter/avf_showcqt.c
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@ -434,14 +434,16 @@ static double b_func(void *p, double x)
return lrint(x*255.0);
}
static int init_axis_color(ShowCQTContext *s, AVFrame *tmp)
static int init_axis_color(ShowCQTContext *s, AVFrame *tmp, int half)
{
const char *var_names[] = { "timeclamp", "tc", "frequency", "freq", "f", NULL };
const char *func_names[] = { "midi", "r", "g", "b", NULL };
double (*funcs[])(void *, double) = { midi, r_func, g_func, b_func };
AVExpr *expr = NULL;
double *freq = NULL;
int x, y, ret;
int x, xs, y, ret;
int width = half ? 1920/2 : 1920, height = half ? 16 : 32;
int step = half ? 2 : 1;
if (s->basefreq != (double) BASEFREQ || s->endfreq != (double) ENDFREQ) {
av_log(s->ctx, AV_LOG_WARNING, "font axis rendering is not implemented in non-default frequency range,"
@ -460,17 +462,16 @@ static int init_axis_color(ShowCQTContext *s, AVFrame *tmp)
return ret;
}
for (x = 0; x < 1920; x++) {
double vars[] = { s->timeclamp, s->timeclamp, freq[x], freq[x], freq[x] };
for (x = 0, xs = 0; x < width; x++, xs += step) {
double vars[] = { s->timeclamp, s->timeclamp, freq[xs], freq[xs], freq[xs] };
int color = (int) av_expr_eval(expr, vars, NULL);
uint8_t r = (color >> 16) & 0xFF, g = (color >> 8) & 0xFF, b = color & 0xFF;
uint8_t *data = tmp->data[0];
int linesize = tmp->linesize[0];
for (y = 0; y < 32; y++) {
for (y = 0; y < height; y++) {
data[linesize * y + 4 * x] = r;
data[linesize * y + 4 * x + 1] = g;
data[linesize * y + 4 * x + 2] = b;
data[linesize * y + 4 * x + 3] = 0;
}
}
@ -570,19 +571,18 @@ static int render_default_font(AVFrame *tmp)
int x, u, v, mask;
uint8_t *data = tmp->data[0];
int linesize = tmp->linesize[0];
int width = 1920/2, height = 16;
for (x = 0; x < 1920; x += 192) {
for (x = 0; x < width; x += width/10) {
uint8_t *startptr = data + 4 * x;
for (u = 0; u < 12; u++) {
for (v = 0; v < 16; v++) {
uint8_t *p = startptr + 2 * v * linesize + 16 * 4 * u;
for (mask = 0x80; mask; mask >>= 1, p += 8) {
if (mask & avpriv_vga16_font[str[u] * 16 + v]) {
for (v = 0; v < height; v++) {
uint8_t *p = startptr + v * linesize + height/2 * 4 * u;
for (mask = 0x80; mask; mask >>= 1, p += 4) {
if (mask & avpriv_vga16_font[str[u] * 16 + v])
p[3] = 255;
p[7] = 255;
p[linesize+3] = 255;
p[linesize+7] = 255;
}
else
p[3] = 0;
}
}
}
@ -595,22 +595,27 @@ static int init_axis_from_font(ShowCQTContext *s)
{
AVFrame *tmp = NULL;
int ret = AVERROR(ENOMEM);
int width = 1920, height = 32;
int default_font = 0;
if (!(tmp = alloc_frame_empty(AV_PIX_FMT_RGBA, 1920, 32)))
if (!(tmp = alloc_frame_empty(AV_PIX_FMT_RGBA, width, height)))
goto fail;
if (!(s->axis_frame = av_frame_alloc()))
goto fail;
if ((ret = init_axis_color(s, tmp)) < 0)
if (render_freetype(s, tmp) < 0 && (default_font = 1, ret = render_default_font(tmp)) < 0)
goto fail;
if (render_freetype(s, tmp) < 0 && (ret = render_default_font(tmp)) < 0)
if (default_font)
width /= 2, height /= 2;
if ((ret = init_axis_color(s, tmp, default_font)) < 0)
goto fail;
if ((ret = ff_scale_image(s->axis_frame->data, s->axis_frame->linesize, s->width, s->axis_h,
convert_axis_pixel_format(s->format), tmp->data, tmp->linesize,
1920, 32, AV_PIX_FMT_RGBA, s->ctx)) < 0)
width, height, AV_PIX_FMT_RGBA, s->ctx)) < 0)
goto fail;
av_frame_free(&tmp);