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FFmpeg/libavcodec/libaribcaption.c
TADANO Tokumei b6138633cd lavc/libaribcaption.c: add ARIB caption decoder using libaribcaption 
This patch add another ARIB caption decoder using libaribcaption
external library.

Unlike libaribb24, it supports 3 types of subtitle outputs:
* text: plain text
* ass: ASS formatted text
* bitmap: bitmap image

Default subtitle type is ass as same as libaribb24.
Advantages compared with libaribb24 on ASS subtitle are:
* Subtitle positioning.
* Multi-rect subtitle: some captions are displayed at different
  position at a time.
* More stability and reproducibility.

To compile with this feature:
* libaribcaption external library has to be pre-installed.
  https://github.com/xqq/libaribcaption
* configure with `--enable-libaribcaption` option.

`--enable-libaribb24` and `--enable-libaribcaption` options are
not exclusive. If both enabled, libaribcaption precedes as
order listed in `libavcodec/allcodecs.c`.

Signed-off-by: rcombs <rcombs@rcombs.me>
2023-03-28 12:05:19 -04:00

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/*
* ARIB STD-B24 caption decoder using the libaribcaption library
* Copyright (c) 2022 TADANO Tokumei
*
* 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
*/
#include "avcodec.h"
#include "codec_internal.h"
#include "internal.h"
#include "libavcodec/ass.h"
#include "libavutil/avstring.h"
#include "libavutil/avutil.h"
#include "libavutil/thread.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include <aribcaption/aribcaption.h>
#if !defined(DEFAULT_FONT_ASS)
# define DEFAULT_FONT_ASS "sans-serif"
#endif
#define ARIBC_BPRINT_SIZE_INIT 64
#define ARIBC_BPRINT_SIZE_MAX (8 * 1024)
#define ARIBC_ALPHA_MAX_NUM 4
#define ARIBC_ALPHA_DEFAULT_FRONT 0xFF
#define ARIBC_ALPHA_DEFAULT_BACK 0x80
#define ARIBCC_COLOR_RGB(c) ((c) & 0xFFFFFF)
#define ARIBCC_COLOR_DIFF_RGB(c1,c2) (((c1) ^ (c2)) & 0x00FFFFFF)
#define ARIBCC_COLOR_DIFF_A(c1,c2) (((c1) ^ (c2)) & 0xFF000000)
#define CLUT_RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
#define CLUT_A(c) (((c) >> 24) & 0xFF)
#define CLUT_R(c) (((c) >> 16) & 0xFF)
#define CLUT_G(c) (((c) >> 8) & 0xFF)
#define CLUT_B(c) ( (c) & 0xFF)
#define ARIBCC_COLOR_TO_CLUT_RGBA(c,a) (((ARIBCC_COLOR_A(c) ? ARIBCC_COLOR_A(c) : (a)) << 24) | \
(ARIBCC_COLOR_R(c) << 16) | \
(ARIBCC_COLOR_G(c) << 8) | \
(ARIBCC_COLOR_B(c)))
typedef struct ARIBCaptionContext {
AVClass *class;
AVCodecContext *avctx;
const AVPacket *avpkt;
AVSubtitle *sub;
aribcc_context_t *context;
aribcc_decoder_t *decoder;
aribcc_renderer_t *renderer;
int subtitle_type;
int encoding_scheme;
bool ass_single_rect;
char *font;
bool replace_fullwidth_ascii;
bool force_stroke_text;
bool ignore_background;
bool ignore_ruby;
float stroke_width;
bool replace_drcs;
int64_t pts;
AVRational time_base;
int canvas_width;
int canvas_height;
int plane_width;
int plane_height;
int frame_width;
int frame_height;
int bitmap_plane_width;
int bitmap_plane_height;
int font_size;
int charstyle;
int border_style;
int readorder;
aribcc_caption_t caption;
aribcc_render_result_t render_result;
uint32_t *clut;
int clut_idx;
int clut_overflow;
uint8_t clut_alpha[ARIBC_ALPHA_MAX_NUM];
} ARIBCaptionContext;
static void hex_dump_debug(void *ctx, const char *buf, int buf_size)
{
int i;
for (i = 0; i < buf_size; i++) {
ff_dlog(ctx, "%02hhx ", buf[i]);
if (i % 16 == 15)
ff_dlog(ctx, "\n");
}
if (i % 16)
ff_dlog(ctx, "\n");
}
static void logcat_callback(aribcc_loglevel_t level, const char* message, void* userdata)
{
ARIBCaptionContext *ctx = userdata;
int lvl;
if (ctx->decoder != NULL) {
switch (level) {
case ARIBCC_LOGLEVEL_ERROR:
lvl = AV_LOG_ERROR;
break;
case ARIBCC_LOGLEVEL_WARNING:
lvl = AV_LOG_WARNING;
break;
default:
lvl = AV_LOG_INFO;
}
av_log(ctx, lvl, "%s\n", message);
}
}
static void estimate_video_frame_size(ARIBCaptionContext *ctx)
{
if (ctx->avctx->width > 0 && ctx->avctx->height > 0) {
/* input video size specified by -canvas_size option */
ctx->bitmap_plane_width = ctx->avctx->width;
ctx->bitmap_plane_height = ctx->avctx->height;
} else if (ctx->plane_width == 960) {
/* ARIB TR-B14 Fascicle 2 Volume 3 [Section 2] 4.3.1 */
/* ARIB TR-B14 Fascicle 2 Volume 3 [Section 2] Appendix-4 */
ctx->bitmap_plane_width = 1440;
ctx->bitmap_plane_height = 1080;
} else {
ctx->bitmap_plane_width = ctx->plane_width;
ctx->bitmap_plane_height = ctx->plane_height;
}
/* Expand either width or height */
if (ctx->bitmap_plane_height * ctx->plane_width > ctx->bitmap_plane_width * ctx->plane_height) {
ctx->frame_height = ctx->bitmap_plane_height;
ctx->frame_width = ctx->frame_height * ctx->plane_width / ctx->plane_height;
} else {
ctx->frame_width = ctx->bitmap_plane_width;
ctx->frame_height = ctx->frame_width * ctx->plane_height / ctx->plane_width;
}
}
static void clut_set_alpha(ARIBCaptionContext *ctx, uint8_t a)
{
int i;
for (i = 0; i < ARIBC_ALPHA_MAX_NUM; i++) {
if (ctx->clut_alpha[i] == 0) {
ctx->clut_alpha[i] = a;
return;
}
if (ctx->clut_alpha[i] == a)
return;
}
return;
}
static uint8_t clut_find_nearlest_alpha(ARIBCaptionContext *ctx, uint8_t a)
{
int i, j, d;
if (a == 0)
return a;
d = 256;
j = 0;
for (i = 0; i < ARIBC_ALPHA_MAX_NUM; i++) {
if (ctx->clut_alpha[i] == a)
return a;
if (ctx->clut_alpha[i] == 0)
break;
if (abs((int)a - (int)ctx->clut_alpha[i]) < d) {
d = abs((int)a - (int)ctx->clut_alpha[i]);
j = i;
}
}
return ctx->clut_alpha[j];
}
static int clut_find(ARIBCaptionContext *ctx, uint32_t rgba)
{
int i;
for (i = 0; i < ctx->clut_idx; i++) {
if (ctx->clut[i] == rgba)
return i;
}
return -1;
}
static inline int clut_color_distance(uint32_t rgba1, uint32_t rgba2)
{
return abs((int)CLUT_R(rgba1) - (int)CLUT_R(rgba2)) +
abs((int)CLUT_G(rgba1) - (int)CLUT_G(rgba2)) +
abs((int)CLUT_B(rgba1) - (int)CLUT_B(rgba2));
}
static uint8_t clut_pick_or_set(ARIBCaptionContext *ctx, int r, int g, int b, int a)
{
int c, i, d, d_min;
uint32_t rgba;
a = clut_find_nearlest_alpha(ctx, a);
if (a == 0)
return 0; /* transparent */
rgba = CLUT_RGBA(r,g,b,a);
d_min = 256 * 3;
c = 0;
for (i = 0; i < ctx->clut_idx; i++) {
if (ctx->clut[i] == rgba)
return i;
if (CLUT_A(ctx->clut[i]) != a)
continue;
d = clut_color_distance(ctx->clut[i], rgba);
if (d < d_min) {
d_min = d;
c = i;
}
}
if (d_min > 3) {
if (ctx->clut_idx >= AVPALETTE_COUNT)
ctx->clut_overflow++;
else {
c = ctx->clut_idx;
ctx->clut[ctx->clut_idx++] = rgba;
}
}
return c;
}
/* initialiaze CLUT with each character colors */
static void clut_init(ARIBCaptionContext *ctx, aribcc_caption_region_t *region)
{
aribcc_color_t text_color, back_color, stroke_color;
uint32_t rgba;
ctx->clut[0] = CLUT_RGBA(0,0,0,0); /* transparent */
ctx->clut_alpha[0] = 0xFF;
ctx->clut_idx = 1;
ctx->clut_overflow = 0;
text_color = region->chars[0].text_color;
back_color = region->chars[0].back_color;
stroke_color = region->chars[0].stroke_color;
rgba = ARIBCC_COLOR_TO_CLUT_RGBA(text_color, ARIBC_ALPHA_DEFAULT_FRONT);
ctx->clut[ctx->clut_idx++] = rgba;
clut_set_alpha(ctx, CLUT_A(rgba));
rgba = ARIBCC_COLOR_TO_CLUT_RGBA(back_color, ARIBC_ALPHA_DEFAULT_BACK);
ctx->clut[ctx->clut_idx++] = rgba;
clut_set_alpha(ctx, CLUT_A(rgba));
rgba = ARIBCC_COLOR_TO_CLUT_RGBA(stroke_color, ARIBC_ALPHA_DEFAULT_FRONT);
if (clut_find(ctx, rgba) < 0) {
ctx->clut[ctx->clut_idx++] = rgba;
clut_set_alpha(ctx, CLUT_A(rgba));
}
for (int i = 1; i < region->char_count; i++) {
if (region->chars[i].text_color != text_color) {
rgba = ARIBCC_COLOR_TO_CLUT_RGBA(region->chars[i].text_color,
ARIBC_ALPHA_DEFAULT_FRONT);
if (clut_find(ctx, rgba) < 0) {
ctx->clut[ctx->clut_idx++] = rgba;
clut_set_alpha(ctx, CLUT_A(rgba));
}
}
if (region->chars[i].back_color != back_color) {
rgba = ARIBCC_COLOR_TO_CLUT_RGBA(region->chars[i].back_color,
ARIBC_ALPHA_DEFAULT_BACK);
if (clut_find(ctx, rgba) < 0) {
ctx->clut[ctx->clut_idx++] = rgba;
clut_set_alpha(ctx, CLUT_A(rgba));
}
}
if (region->chars[i].stroke_color != stroke_color) {
rgba = ARIBCC_COLOR_TO_CLUT_RGBA(region->chars[i].stroke_color,
ARIBC_ALPHA_DEFAULT_FRONT);
if (clut_find(ctx, rgba) < 0) {
if (ctx->clut_idx < AVPALETTE_COUNT)
ctx->clut[ctx->clut_idx++] = rgba;
clut_set_alpha(ctx, CLUT_A(rgba));
}
}
}
}
/**
* aribcaption_trans_{bitmap|ass|text}_subtitle()
*
* Transfer decoded subtitle to AVSubtitle with corresponding subtitle type.
*
* @param ctx pointer to the ARIBCaptionContext
* @return > 0 number of rectangles to be displayed
* = 0 no subtitle
* < 0 error code
*/
static int aribcaption_trans_bitmap_subtitle(ARIBCaptionContext *ctx)
{
int ret = 0;
AVSubtitle *sub = ctx->sub;
int status, rect_idx;
int old_width = ctx->frame_width;
int old_height = ctx->frame_height;
if (ctx->caption.plane_width > 0 && ctx->caption.plane_height > 0) {
ctx->plane_width = ctx->caption.plane_width;
ctx->plane_height = ctx->caption.plane_height;
}
estimate_video_frame_size(ctx);
if (ctx->frame_width != old_width || ctx->frame_height != old_height) {
ff_dlog(ctx, "canvas: %dx%d plane: %dx%d bitmap: %dx%d frame: %dx%d\n",
ctx->avctx->width, ctx->avctx->height,
ctx->plane_width, ctx->plane_height,
ctx->bitmap_plane_width, ctx->bitmap_plane_height,
ctx->frame_width, ctx->frame_height);
if (!aribcc_renderer_set_frame_size(ctx->renderer,
ctx->frame_width, ctx->frame_height)) {
av_log(ctx, AV_LOG_ERROR,
"aribcc_renderer_set_frame_size() returned with error.\n");
return AVERROR_EXTERNAL;
}
}
status = aribcc_renderer_append_caption(ctx->renderer, &ctx->caption);
if (!status) {
av_log(ctx, AV_LOG_ERROR,
"aribcc_renderer_append_caption() returned with error.\n");
return AVERROR_EXTERNAL;
}
status = aribcc_renderer_render(ctx->renderer, ctx->pts, &ctx->render_result);
switch (status) {
case ARIBCC_RENDER_STATUS_GOT_IMAGE:
break;
case ARIBCC_RENDER_STATUS_GOT_IMAGE_UNCHANGED:
aribcc_render_result_cleanup(&ctx->render_result);
ff_dlog(ctx, "got image unchanged\n");
return 0;
case ARIBCC_RENDER_STATUS_NO_IMAGE:
ff_dlog(ctx, "no image\n");
return 0;
case ARIBCC_RENDER_STATUS_ERROR:
av_log(ctx, AV_LOG_ERROR,
"aribcc_renderer_render() returned with error.\n");
return AVERROR_EXTERNAL;
default:
aribcc_render_result_cleanup(&ctx->render_result);
av_log(ctx, AV_LOG_ERROR,
"aribcc_renderer_render() returned unknown status: %d\n", status);
return AVERROR_EXTERNAL;
}
if (!ctx->render_result.image_count || ctx->render_result.images == NULL) {
aribcc_render_result_cleanup(&ctx->render_result);
ff_dlog(ctx, "no image (%d)\n", ctx->render_result.image_count);
return 0;
}
sub->format = 0; /* graphic */
sub->rects = av_calloc(ctx->render_result.image_count, sizeof(*sub->rects));
if (!sub->rects) {
ret = AVERROR(ENOMEM);
goto fail;
}
for (int i = 0; i < ctx->render_result.image_count; i++) {
sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
if (!sub->rects[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
for (rect_idx = 0; rect_idx < ctx->caption.region_count; rect_idx++) {
AVSubtitleRect *rect = sub->rects[rect_idx];
aribcc_image_t *image = &ctx->render_result.images[rect_idx];
int w, h, shrink_height, dst_idx;
clut_init(ctx, &ctx->caption.regions[rect_idx]);
rect->w = image->width * ctx->bitmap_plane_width / ctx->frame_width;
rect->h = image->height * ctx->bitmap_plane_height / ctx->frame_height;
rect->data[0] = av_mallocz(rect->w * rect->h);
if (!rect->data[0]) {
ret = AVERROR(ENOMEM);
goto fail;
}
if ((image->height != rect->h && image->width != rect->w) ||
image->stride < image->width * 4 ||
image->stride * image->height > image->bitmap_size) {
av_log(ctx, AV_LOG_ERROR, "Bug: unexpected rendered image: %d(%d)x%d -> %dx%d\n",
image->width, image->stride / 4, image->height, rect->w, rect->h);
ret = AVERROR_EXTERNAL;
goto fail;
}
shrink_height = image->height != rect->h;
dst_idx = 0;
for (h = 0; h < rect->h; h++) {
for (w = 0; w < rect->w; w++) {
/* Bi-linear interpolation */
int n, m, idx0, idx1, r, g, b, a;
if (shrink_height) {
int div_a, y0, y1;
div_a = h * ctx->frame_height;
n = ctx->bitmap_plane_height;
y0 = div_a / n;
y1 = FFMIN(y0 + 1, image->height - 1);
m = div_a - n * y0;
idx0 = image->stride * y0 + w * 4;
idx1 = image->stride * y1 + w * 4;
} else {
int div_a, x0, x1;
div_a = w * ctx->frame_width;
n = ctx->bitmap_plane_width;
x0 = div_a / n;
x1 = FFMIN(x0 + 1, image->width - 1);
m = div_a - n * x0;
idx0 = image->stride * h + x0 * 4;
idx1 = image->stride * h + x1 * 4;
}
r = (image->bitmap[idx0++] * (n - m) + image->bitmap[idx1++] * m) / n;
g = (image->bitmap[idx0++] * (n - m) + image->bitmap[idx1++] * m) / n;
b = (image->bitmap[idx0++] * (n - m) + image->bitmap[idx1++] * m) / n;
a = (image->bitmap[idx0++] * (n - m) + image->bitmap[idx1++] * m) / n;
rect->data[0][dst_idx++] = clut_pick_or_set(ctx, r, g, b, a);
}
}
rect->data[1] = av_memdup(ctx->clut, AVPALETTE_SIZE);
if (!rect->data[1]) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (ctx->avctx->profile == FF_PROFILE_ARIB_PROFILE_C) {
/* ARIB TR-B14 version 3.8 Fascicle 1-(2/2) Volume 3 [Section 4] */
/* No position information is provided for profile C */
rect->x = (ctx->frame_width - rect->w) / 2;
rect->y = ctx->frame_height - rect->h * (ctx->caption.region_count - rect_idx);
} else {
rect->x = image->dst_x * ctx->bitmap_plane_width / ctx->frame_width;
rect->y = image->dst_y * ctx->bitmap_plane_height / ctx->frame_height;
}
rect->type = SUBTITLE_BITMAP;
rect->linesize[0] = rect->w;
rect->nb_colors = 256;
ff_dlog(ctx, "BITMAP subtitle%s (%d,%d) %dx%d -> (%d,%d) %dx%d [%d]: %d colors\n",
(ctx->caption.regions[rect_idx].is_ruby) ? " (ruby)" : "",
image->dst_x, image->dst_y, image->width, image->height,
rect->x, rect->y, rect->w, rect->h,
rect_idx, ctx->clut_idx);
if (ctx->clut_overflow)
av_log(ctx, AV_LOG_WARNING, "CLUT overflow (%d).\n", ctx->clut_overflow);
}
sub->num_rects = rect_idx;
return rect_idx;
fail:
if (sub->rects) {
for (int i = 0; i < ctx->caption.region_count; i++) {
if (sub->rects[i]) {
av_freep(&sub->rects[i]->data[0]);
av_freep(&sub->rects[i]->data[1]);
av_freep(&sub->rects[i]);
}
}
av_freep(&sub->rects);
}
sub->num_rects = 0;
return ret;
}
static int set_ass_header(ARIBCaptionContext *ctx)
{
AVCodecContext *avctx = ctx->avctx;
int outline, shadow;
const char *font_name;
const char *fonts = ctx->font;
if (ctx->border_style == 4) {
outline = 0;
shadow = 4;
} else {
outline = 1;
shadow = 0;
}
if (ctx->force_stroke_text)
outline = (int)(ctx->stroke_width * 4.0 / 3.0);
if (fonts && *fonts)
font_name = av_get_token(&fonts, ",");
else
font_name = av_strdup(DEFAULT_FONT_ASS);
if (!font_name)
return AVERROR(ENOMEM);
av_freep(&avctx->subtitle_header);
avctx->subtitle_header = av_asprintf(
"[Script Info]\r\n"
"ScriptType: v4.00+\r\n"
"PlayResX: %d\r\n"
"PlayResY: %d\r\n"
"WrapStyle: 2\r\n" /* 2: no word wrapping */
"\r\n"
"[V4+ Styles]\r\n"
"Format: Name, "
"Fontname, Fontsize, "
"PrimaryColour, SecondaryColour, OutlineColour, BackColour, "
"Bold, Italic, Underline, StrikeOut, "
"ScaleX, ScaleY, "
"Spacing, Angle, "
"BorderStyle, Outline, Shadow, "
"Alignment, MarginL, MarginR, MarginV, "
"Encoding\r\n"
"Style: "
"Default," /* Name */
"%s,%d," /* Font{name,size} */
"&H%x,&H%x,&H%x,&H%x," /* {Primary,Secondary,Outline,Back}Colour */
"%d,%d,%d,0," /* Bold, Italic, Underline, StrikeOut */
"100,100," /* Scale{X,Y} */
"0,0," /* Spacing, Angle */
"%d,%d,%d," /* BorderStyle, Outline, Shadow */
"%d,10,10,10," /* Alignment, Margin[LRV] */
"0\r\n" /* Encoding */
"\r\n"
"[Events]\r\n"
"Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n",
ctx->plane_width, ctx->plane_height,
font_name, ctx->font_size,
ASS_DEFAULT_COLOR, ASS_DEFAULT_COLOR,
ASS_DEFAULT_BACK_COLOR, ASS_DEFAULT_BACK_COLOR,
-ASS_DEFAULT_BOLD, -ASS_DEFAULT_ITALIC, -ASS_DEFAULT_UNDERLINE,
ctx->border_style, outline, shadow, ASS_DEFAULT_ALIGNMENT);
av_freep(&font_name);
if (!avctx->subtitle_header)
return AVERROR(ENOMEM);
avctx->subtitle_header_size = strlen(avctx->subtitle_header);
return 0;
}
static void set_ass_color(AVBPrint *buf, int color_num,
aribcc_color_t new_color, aribcc_color_t old_color)
{
if (ARIBCC_COLOR_DIFF_RGB(new_color, old_color))
av_bprintf(buf, "{\\%dc&H%06x&}", color_num,
ARIBCC_COLOR_RGB(new_color));
if (ARIBCC_COLOR_DIFF_A(new_color, old_color))
av_bprintf(buf, "{\\%da&H%02x&}", color_num,
0xFF - ARIBCC_COLOR_A(new_color));
}
static int aribcaption_trans_ass_subtitle(ARIBCaptionContext *ctx)
{
AVSubtitle *sub = ctx->sub;
AVBPrint buf;
bool single_rect = ctx->ass_single_rect;
int ret = 0, rect_idx;
if (ctx->caption.plane_width > 0 && ctx->caption.plane_height > 0 &&
(ctx->caption.plane_width != ctx->plane_width ||
ctx->caption.plane_height != ctx->plane_height)) {
ctx->plane_width = ctx->caption.plane_width;
ctx->plane_height = ctx->caption.plane_height;
if ((ret = set_ass_header(ctx)) < 0)
return ret;
}
/* ARIB TR-B14 version 3.8 Fascicle 1-(2/2) Volume 3 [Section 4] */
/* No position information is provided for profile C */
if (ctx->avctx->profile == FF_PROFILE_ARIB_PROFILE_C)
single_rect = true;
sub->format = 1; /* text */
if (ctx->caption.region_count == 0) {
/* clear previous caption for indefinite duration */
ff_ass_add_rect(sub, "", ctx->readorder++, 0, NULL, NULL);
return 1;
}
av_bprint_init(&buf, ARIBC_BPRINT_SIZE_INIT, ARIBC_BPRINT_SIZE_MAX);
if (single_rect && ctx->avctx->profile != FF_PROFILE_ARIB_PROFILE_C) {
int x, y, rx, ry;
x = ctx->plane_width;
y = ctx->plane_height;
for (int i = 0; i < ctx->caption.region_count; i++) {
rx = ctx->caption.regions[i].x;
ry = ctx->caption.regions[i].y;
if (rx < x)
x = rx;
if (ry < y)
y = ry;
}
av_bprintf(&buf, "{\\an7}");
if (y < 0)
y += ctx->plane_height;
if (x > 0 || y > 0)
av_bprintf(&buf, "{\\pos(%d,%d)}", x, y);
}
rect_idx = 0;
for (int i = 0; i < ctx->caption.region_count; i++) {
aribcc_caption_region_t *region = &ctx->caption.regions[i];
aribcc_color_t text_color = ARIBCC_MAKE_RGBA(0xFF, 0xFF, 0xFF,
ARIBC_ALPHA_DEFAULT_FRONT);
aribcc_color_t stroke_color = ARIBCC_MAKE_RGBA(0, 0, 0,
ARIBC_ALPHA_DEFAULT_FRONT);
aribcc_color_t back_color = ARIBCC_MAKE_RGBA(0, 0, 0,
ARIBC_ALPHA_DEFAULT_BACK);
aribcc_charstyle_t charstyle = ctx->charstyle;
int char_width = ctx->font_size;
int char_height = ctx->font_size;
int char_horizontal_spacing = 0;
if (region->is_ruby && ctx->ignore_ruby)
continue;
if (!single_rect) {
int x = region->x;
int y = region->y;
if (x < 0)
x += ctx->plane_width;
if (y < 0)
y += ctx->plane_height;
av_bprint_clear(&buf);
av_bprintf(&buf, "{\\an7}");
if (x > 0 || y > 0)
av_bprintf(&buf, "{\\pos(%d,%d)}", x, y);
}
if (region->is_ruby)
av_bprintf(&buf, "{\\fs%d}", char_height / 2);
for (int j = 0; j < region->char_count; j++) {
aribcc_caption_char_t *ch = &region->chars[j];
if (ctx->avctx->profile != FF_PROFILE_ARIB_PROFILE_C) {
if (ch->char_horizontal_spacing != char_horizontal_spacing) {
av_bprintf(&buf, "{\\fsp%d}", (region->is_ruby) ?
ch->char_horizontal_spacing / 2 :
ch->char_horizontal_spacing);
char_horizontal_spacing = ch->char_horizontal_spacing;
}
if (ch->char_width != char_width) {
av_bprintf(&buf, "{\\fscx%"PRId64"}",
av_rescale(ch->char_width, 100, ctx->font_size));
char_width = ch->char_width;
}
if (ch->char_height != char_height) {
av_bprintf(&buf, "{\\fscy%"PRId64"}",
av_rescale(ch->char_height, 100, ctx->font_size));
char_height = ch->char_height;
}
}
if (ch->style != charstyle) {
aribcc_charstyle_t diff = ch->style ^ charstyle;
if (diff & ARIBCC_CHARSTYLE_STROKE) {
if (charstyle & ARIBCC_CHARSTYLE_STROKE) {
if (ctx->force_stroke_text)
av_bprintf(&buf, "{\\bord%d}",
(int)(ctx->stroke_width * 4.0 / 3.0));
else
av_bprintf(&buf, "{\\bord0}");
} else
av_bprintf(&buf, "{\\bord3}");
}
if (diff & ARIBCC_CHARSTYLE_BOLD) {
if (charstyle & ARIBCC_CHARSTYLE_BOLD)
av_bprintf(&buf, "{\\b0}");
else
av_bprintf(&buf, "{\\b1}");
}
if (diff & ARIBCC_CHARSTYLE_ITALIC) {
if (charstyle & ARIBCC_CHARSTYLE_ITALIC)
av_bprintf(&buf, "{\\i0}");
else
av_bprintf(&buf, "{\\i1}");
}
if (diff & ARIBCC_CHARSTYLE_UNDERLINE) {
if (charstyle & ARIBCC_CHARSTYLE_UNDERLINE)
av_bprintf(&buf, "{\\u0}");
else
av_bprintf(&buf, "{\\u1}");
}
charstyle = ch->style;
}
if (ch->text_color != text_color) {
set_ass_color(&buf, 1, ch->text_color, text_color);
text_color = ch->text_color;
}
if (ch->stroke_color != stroke_color) {
set_ass_color(&buf, 3, ch->stroke_color, stroke_color);
stroke_color = ch->stroke_color;
}
if (ch->back_color != back_color) {
if (ctx->border_style == 4)
set_ass_color(&buf, 4, ch->back_color, back_color);
else
set_ass_color(&buf, 3, ch->back_color, back_color);
back_color = ch->back_color;
}
if (region->chars[j].type == ARIBCC_CHARTYPE_DRCS)
av_bprintf(&buf, "\xe3\x80\x93"); /* Geta Mark */
else
ff_ass_bprint_text_event(&buf, ch->u8str, strlen(ch->u8str), "", 0);
}
if (single_rect) {
if (i + 1 < ctx->caption.region_count)
av_bprintf(&buf, "{\\r}\\N");
ff_dlog(ctx, "ASS subtitle%s (%d,%d) %dx%d [%d]\n",
(region->is_ruby) ? " (ruby)" : "",
region->x, region->y, region->width, region->height,
rect_idx);
} else {
if (!av_bprint_is_complete(&buf)) {
ret = AVERROR(ENOMEM);
goto fail;
}
ff_dlog(ctx, "ASS subtitle%s (%d,%d) %dx%d [%d]: %s\n",
(region->is_ruby) ? " (ruby)" : "",
region->x, region->y, region->width, region->height,
rect_idx, buf.str);
ret = ff_ass_add_rect(sub, buf.str, ctx->readorder++, 0 , NULL, NULL);
if (ret != 0)
goto fail;
rect_idx++;
}
}
if (single_rect) {
if (!av_bprint_is_complete(&buf)) {
ret = AVERROR(ENOMEM);
goto fail;
}
ff_dlog(ctx, "ASS subtitle: %s\n", buf.str);
ret = ff_ass_add_rect(sub, buf.str, ctx->readorder++, 0 , NULL, NULL);
if (ret != 0)
goto fail;
rect_idx++;
}
av_bprint_finalize(&buf, NULL);
return rect_idx;
fail:
if (sub->rects) {
for (int i = 0; i < ctx->caption.region_count; i++) {
if (sub->rects[i]) {
av_freep(&sub->rects[i]->ass);
av_freep(&sub->rects[i]);
}
}
av_freep(&sub->rects);
}
sub->num_rects = 0;
av_bprint_finalize(&buf, NULL);
return ret;
}
static int aribcaption_trans_text_subtitle(ARIBCaptionContext *ctx)
{
AVSubtitle *sub = ctx->sub;
AVSubtitleRect *rect;
int ret = 0;
const char *text;
sub->rects = av_calloc(ctx->caption.region_count, sizeof(*sub->rects));
if (!sub->rects) {
ret = AVERROR(ENOMEM);
goto fail;
}
sub->num_rects = 1;
sub->rects[0] = av_mallocz(sizeof(*sub->rects[0]));
if (!sub->rects[0]) {
ret = AVERROR(ENOMEM);
goto fail;
}
rect = sub->rects[0];
if (ctx->caption.region_count == 0)
text = ""; /* clear previous caption */
else {
text = ctx->caption.text;
ff_dlog(ctx, "TEXT subtitle: %s\n", text);
}
rect->text = av_strdup(text);
if (!rect->text) {
ret = AVERROR(ENOMEM);
goto fail;
}
sub->format = 1; /* text */
rect->type = SUBTITLE_TEXT;
return 1;
fail:
if (sub->rects) {
rect = sub->rects[0];
if (rect) {
av_freep(&rect->text);
av_freep(&rect);
}
av_freep(&sub->rects);
}
sub->num_rects = 0;
return ret;
}
static int aribcaption_decode(AVCodecContext *avctx, AVSubtitle *sub,
int *got_sub_ptr, const AVPacket *avpkt)
{
ARIBCaptionContext *ctx = avctx->priv_data;
int status;
ff_dlog(ctx, "ARIB caption packet pts=%"PRIx64":\n", avpkt->pts);
if (sub->num_rects) {
avpriv_request_sample(ctx, "Different Version of Segment asked Twice");
return AVERROR_PATCHWELCOME;
}
hex_dump_debug(ctx, avpkt->data, avpkt->size);
ctx->sub = sub;
ctx->avpkt = avpkt;
ctx->time_base = avctx->pkt_timebase;
if (ctx->time_base.num <= 0 || ctx->time_base.den <= 0) {
av_log(ctx, AV_LOG_VERBOSE, "No timebase set. assuming 90kHz.\n");
ctx->time_base = av_make_q(1, 90000);
}
if (avpkt->pts == AV_NOPTS_VALUE)
ctx->pts = ARIBCC_PTS_NOPTS;
else
ctx->pts = av_rescale_q(avpkt->pts, ctx->time_base, (AVRational){1, 1000});
status = aribcc_decoder_decode(ctx->decoder, avpkt->data, avpkt->size,
ctx->pts, &ctx->caption);
if (status == ARIBCC_DECODE_STATUS_ERROR) {
av_log(ctx, AV_LOG_ERROR,
"aribcc_decoder_decode() returned with error.\n");
return AVERROR(EAGAIN);
}
if (status == ARIBCC_DECODE_STATUS_NO_CAPTION) {
ff_dlog(ctx, "No caption.\n");
return avpkt->size;
} else {
ff_dlog(ctx, "type=%02x, flags=%x, lang=%03x\n",
ctx->caption.type, ctx->caption.flags, ctx->caption.iso6392_language_code);
ff_dlog(ctx, "region count = %d, start=%d.%d, duration=%d.%d\n",
ctx->caption.region_count,
(int)(ctx->caption.pts / 1000), (int)(ctx->caption.pts % 1000),
(int)((ctx->caption.wait_duration == ARIBCC_DURATION_INDEFINITE) ?
-1 : ctx->caption.wait_duration / 1000),
(int)((ctx->caption.wait_duration == ARIBCC_DURATION_INDEFINITE) ?
0 : ctx->caption.wait_duration % 1000));
}
switch ((enum AVSubtitleType) ctx->subtitle_type) {
case SUBTITLE_TEXT:
status = aribcaption_trans_text_subtitle(ctx);
break;
case SUBTITLE_ASS:
status = aribcaption_trans_ass_subtitle(ctx);
break;
case SUBTITLE_BITMAP:
status = aribcaption_trans_bitmap_subtitle(ctx);
break;
case SUBTITLE_NONE:
default:
status = 0;
}
if (status < 0) {
av_log(ctx, AV_LOG_ERROR, "Failed to set Subtitle: %s\n",
av_err2str(status));
aribcc_caption_cleanup(&ctx->caption);
return status;
}
if (status > 0) {
*got_sub_ptr = 1;
if (ctx->avpkt->pts != AV_NOPTS_VALUE)
sub->pts = av_rescale_q(ctx->avpkt->pts,
ctx->time_base, AV_TIME_BASE_Q);
if (ctx->caption.wait_duration == ARIBCC_DURATION_INDEFINITE)
sub->end_display_time = UINT32_MAX;
else
sub->end_display_time = (uint32_t)ctx->caption.wait_duration;
}
aribcc_caption_cleanup(&ctx->caption);
return avpkt->size;
}
static void aribcaption_flush(AVCodecContext *avctx)
{
ARIBCaptionContext *ctx = avctx->priv_data;
if (ctx->decoder)
aribcc_decoder_flush(ctx->decoder);
if (ctx->renderer)
aribcc_renderer_flush(ctx->renderer);
if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
ctx->readorder = 0;
}
static int aribcaption_close(AVCodecContext *avctx)
{
ARIBCaptionContext *ctx = avctx->priv_data;
av_freep(&ctx->clut);
if (ctx->renderer)
aribcc_renderer_free(ctx->renderer);
if (ctx->decoder)
aribcc_decoder_free(ctx->decoder);
if (ctx->context)
aribcc_context_free(ctx->context);
return 0;
}
static int aribcaption_init(AVCodecContext *avctx)
{
ARIBCaptionContext *ctx = avctx->priv_data;
aribcc_profile_t profile;
int ret = 0;
ctx->avctx = avctx;
switch (avctx->profile) {
case FF_PROFILE_ARIB_PROFILE_A:
profile = ARIBCC_PROFILE_A;
/* assume 960x540 at initial state */
ctx->plane_width = 960;
ctx->plane_height = 540;
ctx->font_size = 36;
break;
case FF_PROFILE_ARIB_PROFILE_C:
profile = ARIBCC_PROFILE_C;
ctx->plane_width = 320;
ctx->plane_height = 180;
ctx->font_size = 16;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown or unsupported profile set.\n");
return AVERROR(EINVAL);
}
/* determine BorderStyle of ASS header */
if (ctx->ignore_background)
ctx->border_style = 1;
else
ctx->border_style = 4;
ctx->charstyle = ARIBCC_CHARSTYLE_DEFAULT;
if (ctx->force_stroke_text || ctx->ignore_background)
ctx->charstyle |= ARIBCC_CHARSTYLE_STROKE;
if (!(ctx->context = aribcc_context_alloc())) {
av_log(avctx, AV_LOG_ERROR, "Failed to alloc libaribcaption context.\n");
return AVERROR_EXTERNAL;
}
aribcc_context_set_logcat_callback(ctx->context, logcat_callback, avctx);
if (!(ctx->decoder = aribcc_decoder_alloc(ctx->context))) {
av_log(avctx, AV_LOG_ERROR, "Failed to alloc libaribcaption decoder.\n");
return AVERROR_EXTERNAL;
}
if (!aribcc_decoder_initialize(ctx->decoder,
(enum aribcc_encoding_scheme_t) ctx->encoding_scheme,
ARIBCC_CAPTIONTYPE_CAPTION,
profile,
ARIBCC_LANGUAGEID_FIRST)) {
av_log(avctx, AV_LOG_ERROR, "Failed to initialize libaribcaption decoder.\n");
return AVERROR_EXTERNAL;
}
aribcc_decoder_set_replace_msz_fullwidth_ascii(ctx->decoder,
ctx->replace_fullwidth_ascii);
/* Similar behavior as ffmpeg tool to set canvas size */
if (ctx->canvas_width > 0 && ctx->canvas_height > 0 &&
(ctx->avctx->width == 0 || ctx->avctx->height == 0)) {
ctx->avctx->width = ctx->canvas_width;
ctx->avctx->height = ctx->canvas_height;
}
switch ((enum AVSubtitleType) ctx->subtitle_type) {
case SUBTITLE_ASS:
ret = set_ass_header(ctx);
if (ret != 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to set ASS header: %s\n",
av_err2str(ret));
return ret;
}
break;
case SUBTITLE_BITMAP:
if(!(ctx->renderer = aribcc_renderer_alloc(ctx->context))) {
av_log(avctx, AV_LOG_ERROR, "Failed to alloc libaribcaption renderer.\n");
return AVERROR_EXTERNAL;
}
if(!aribcc_renderer_initialize(ctx->renderer,
ARIBCC_CAPTIONTYPE_CAPTION,
ARIBCC_FONTPROVIDER_TYPE_AUTO,
ARIBCC_TEXTRENDERER_TYPE_AUTO)) {
av_log(avctx, AV_LOG_ERROR, "Failed to initialize libaribcaption renderer.\n");
return AVERROR_EXTERNAL;
}
estimate_video_frame_size(ctx);
ff_dlog(ctx, "canvas: %dx%d plane: %dx%d bitmap: %dx%d frame: %dx%d\n",
ctx->avctx->width, ctx->avctx->height,
ctx->plane_width, ctx->plane_height,
ctx->bitmap_plane_width, ctx->bitmap_plane_height,
ctx->frame_width, ctx->frame_height);
if (!aribcc_renderer_set_frame_size(ctx->renderer,
ctx->frame_width, ctx->frame_height)) {
av_log(ctx, AV_LOG_ERROR,
"aribcc_renderer_set_frame_size() returned with error.\n");
return AVERROR_EXTERNAL;
}
if (!(ctx->clut = av_mallocz(AVPALETTE_SIZE)))
return AVERROR(ENOMEM);
aribcc_renderer_set_storage_policy(ctx->renderer, ARIBCC_CAPTION_STORAGE_POLICY_MINIMUM, 0);
aribcc_renderer_set_replace_drcs(ctx->renderer, ctx->replace_drcs);
aribcc_renderer_set_force_stroke_text(ctx->renderer, ctx->force_stroke_text);
aribcc_renderer_set_force_no_background(ctx->renderer, ctx->ignore_background);
aribcc_renderer_set_force_no_ruby(ctx->renderer, ctx->ignore_ruby);
aribcc_renderer_set_stroke_width(ctx->renderer, ctx->stroke_width);
if (ctx->font) {
int is_nomem = 0;
size_t count = 0;
const char **font_families = NULL;
const char *fonts = ctx->font;
while (*fonts) {
const char **ff = av_realloc_array(font_families, count + 1, sizeof(*font_families));
if (!ff) {
is_nomem = 1;
break;
} else {
font_families = ff;
ff[count++] = av_get_token(&fonts, ",");
if (!ff[count - 1]) {
is_nomem = 1;
break;
} else if (*fonts)
fonts++;
}
}
if (!is_nomem && count)
aribcc_renderer_set_default_font_family(ctx->renderer, font_families, count, true);
while (count)
av_freep(&font_families[--count]);
av_freep(&font_families);
if (is_nomem)
return AVERROR(ENOMEM);
}
break;
case SUBTITLE_TEXT:
case SUBTITLE_NONE:
default:
/* do nothing */ ;
}
ctx->readorder = 0;
return 0;
}
#if !defined(ASS_SINGLE_RECT)
# define ASS_SINGLE_RECT 0
#endif
#define OFFSET(x) offsetof(ARIBCaptionContext, x)
#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "sub_type", "subtitle rendering type",
OFFSET(subtitle_type), AV_OPT_TYPE_INT,
{ .i64 = SUBTITLE_ASS }, SUBTITLE_NONE, SUBTITLE_ASS, SD, "type" },
{ "none", "do nothing", 0, AV_OPT_TYPE_CONST,
{ .i64 = SUBTITLE_NONE }, .flags = SD, .unit = "type" },
{ "bitmap", "bitmap rendering", 0, AV_OPT_TYPE_CONST,
{ .i64 = SUBTITLE_BITMAP }, .flags = SD, .unit = "type" },
{ "text", "plain text", 0, AV_OPT_TYPE_CONST,
{ .i64 = SUBTITLE_TEXT }, .flags = SD, .unit = "type" },
{ "ass", "formatted text", 0, AV_OPT_TYPE_CONST,
{ .i64 = SUBTITLE_ASS }, .flags = SD, .unit = "type" },
{ "caption_encoding", "encoding scheme of subtitle text",
OFFSET(encoding_scheme), AV_OPT_TYPE_INT, { .i64 = ARIBCC_ENCODING_SCHEME_AUTO },
ARIBCC_ENCODING_SCHEME_AUTO, ARIBCC_ENCODING_SCHEME_ABNT_NBR_15606_1_LATIN, SD, "encoding" },
{ "auto", "automatically detect encoding scheme", 0, AV_OPT_TYPE_CONST,
{ .i64 = ARIBCC_ENCODING_SCHEME_AUTO }, .flags = SD, .unit = "encoding" },
{ "jis", "8bit-char JIS encoding (Japanese ISDB captions)", 0, AV_OPT_TYPE_CONST,
{ .i64 = ARIBCC_ENCODING_SCHEME_ARIB_STD_B24_JIS }, .flags = SD, .unit = "encoding" },
{ "utf8", "UTF-8 encoding (Philippines ISDB-T captions)", 0, AV_OPT_TYPE_CONST,
{ .i64 = ARIBCC_ENCODING_SCHEME_ARIB_STD_B24_UTF8 }, .flags = SD, .unit = "encoding" },
{ "latin", "latin characters (SBTVD / ISDB-Tb captions used in South America)", 0, AV_OPT_TYPE_CONST,
{ .i64 = ARIBCC_ENCODING_SCHEME_ABNT_NBR_15606_1_LATIN }, .flags = SD, .unit = "encoding" },
{ "ass_single_rect", "workaround of ASS subtitle for players which can't handle multi-rectangle [ass]",
OFFSET(ass_single_rect), AV_OPT_TYPE_BOOL, { .i64 = ASS_SINGLE_RECT }, 0, 1, SD },
{ "font", "comma-separated font family [ass, bitmap]",
OFFSET(font), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
{ "replace_fullwidth_ascii", "replace MSZ fullwidth alphanumerics with halfwidth alphanumerics [ass, bitmap]",
OFFSET(replace_fullwidth_ascii), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, SD },
{ "force_outline_text", "always render characters with outline [(ass), bitmap]",
OFFSET(force_stroke_text), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, SD },
{ "ignore_background", "ignore rendering caption background [(ass), bitmap]",
OFFSET(ignore_background), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, SD },
{ "ignore_ruby", "ignore ruby-like characters [ass, bitmap]",
OFFSET(ignore_ruby), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, SD },
{ "outline_width", "outline width of text [(ass), bitmap]",
OFFSET(stroke_width), AV_OPT_TYPE_FLOAT, { .dbl = 1.5 }, 0.0, 3.0, SD },
{ "replace_drcs", "replace known DRCS [bitmap]",
OFFSET(replace_drcs), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, SD },
{"canvas_size", "set input video size (WxH or abbreviation) [bitmap]",
OFFSET(canvas_width), AV_OPT_TYPE_IMAGE_SIZE, { .str = NULL }, 0, INT_MAX, SD },
{ NULL }
};
static const AVClass aribcaption_class = {
.class_name = "aribcaption decoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_libaribcaption_decoder = {
.p.name = "libaribcaption",
.p.long_name = NULL_IF_CONFIG_SMALL("ARIB STD-B24 caption decoder"),
.p.type = AVMEDIA_TYPE_SUBTITLE,
.p.id = AV_CODEC_ID_ARIB_CAPTION,
.priv_data_size = sizeof(ARIBCaptionContext),
.init = aribcaption_init,
.close = aribcaption_close,
FF_CODEC_DECODE_SUB_CB(aribcaption_decode),
.flush = aribcaption_flush,
.p.priv_class = &aribcaption_class,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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