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FFmpeg/libavcodec/libaribb24.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

396 lines
13 KiB
C

/*
* ARIB STD-B24 caption decoder using the libaribb24 library
* Copyright (c) 2019 Jan Ekström
*
* 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 "libavcodec/ass.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include <aribb24/aribb24.h>
#include <aribb24/parser.h>
#include <aribb24/decoder.h>
typedef struct Libaribb24Context {
AVClass *class;
arib_instance_t *lib_instance;
arib_parser_t *parser;
arib_decoder_t *decoder;
int read_order;
char *aribb24_base_path;
unsigned int aribb24_skip_ruby;
} Libaribb24Context;
static unsigned int get_profile_font_size(int profile)
{
switch (profile) {
case FF_PROFILE_ARIB_PROFILE_A:
return 36;
case FF_PROFILE_ARIB_PROFILE_C:
return 18;
default:
return 0;
}
}
static void libaribb24_log(void *p, const char *msg)
{
av_log((AVCodecContext *)p, AV_LOG_INFO, "%s\n", msg);
}
static int libaribb24_generate_ass_header(AVCodecContext *avctx)
{
unsigned int plane_width = 0;
unsigned int plane_height = 0;
unsigned int font_size = 0;
switch (avctx->profile) {
case FF_PROFILE_ARIB_PROFILE_A:
plane_width = 960;
plane_height = 540;
font_size = get_profile_font_size(avctx->profile);
break;
case FF_PROFILE_ARIB_PROFILE_C:
plane_width = 320;
plane_height = 180;
font_size = get_profile_font_size(avctx->profile);
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown or unsupported profile set!\n");
return AVERROR(EINVAL);
}
avctx->subtitle_header = av_asprintf(
"[Script Info]\r\n"
"; Script generated by FFmpeg/Lavc%s\r\n"
"ScriptType: v4.00+\r\n"
"PlayResX: %d\r\n"
"PlayResY: %d\r\n"
"\r\n"
"[V4+ Styles]\r\n"
/* ASSv4 header */
"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,1,0," /* 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",
!(avctx->flags & AV_CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "",
plane_width, plane_height,
ASS_DEFAULT_FONT, 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,
ASS_DEFAULT_BORDERSTYLE, ASS_DEFAULT_ALIGNMENT);
if (!avctx->subtitle_header)
return AVERROR(ENOMEM);
avctx->subtitle_header_size = strlen(avctx->subtitle_header);
return 0;
}
static int libaribb24_init(AVCodecContext *avctx)
{
Libaribb24Context *b24 = avctx->priv_data;
void(* arib_dec_init)(arib_decoder_t* decoder) = NULL;
int ret_code = AVERROR_EXTERNAL;
if (!(b24->lib_instance = arib_instance_new(avctx))) {
av_log(avctx, AV_LOG_ERROR, "Failed to initialize libaribb24!\n");
goto init_fail;
}
if (b24->aribb24_base_path) {
av_log(avctx, AV_LOG_INFO, "Setting the libaribb24 base path to '%s'\n",
b24->aribb24_base_path);
arib_set_base_path(b24->lib_instance, b24->aribb24_base_path);
}
arib_register_messages_callback(b24->lib_instance, libaribb24_log);
if (!(b24->parser = arib_get_parser(b24->lib_instance))) {
av_log(avctx, AV_LOG_ERROR, "Failed to initialize libaribb24 PES parser!\n");
goto init_fail;
}
if (!(b24->decoder = arib_get_decoder(b24->lib_instance))) {
av_log(avctx, AV_LOG_ERROR, "Failed to initialize libaribb24 decoder!\n");
goto init_fail;
}
switch (avctx->profile) {
case FF_PROFILE_ARIB_PROFILE_A:
arib_dec_init = arib_initialize_decoder_a_profile;
break;
case FF_PROFILE_ARIB_PROFILE_C:
arib_dec_init = arib_initialize_decoder_c_profile;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown or unsupported profile set!\n");
ret_code = AVERROR(EINVAL);
goto init_fail;
}
arib_dec_init(b24->decoder);
if (libaribb24_generate_ass_header(avctx) < 0) {
ret_code = AVERROR(ENOMEM);
goto init_fail;
}
return 0;
init_fail:
if (b24->decoder)
arib_finalize_decoder(b24->decoder);
if (b24->lib_instance)
arib_instance_destroy(b24->lib_instance);
return ret_code;
}
static int libaribb24_close(AVCodecContext *avctx)
{
Libaribb24Context *b24 = avctx->priv_data;
if (b24->decoder)
arib_finalize_decoder(b24->decoder);
if (b24->lib_instance)
arib_instance_destroy(b24->lib_instance);
return 0;
}
#define RGB_TO_BGR(c) (((c) & 0xff) << 16 | ((c) & 0xff00) | (((c) >> 16) & 0xff))
static int libaribb24_handle_regions(AVCodecContext *avctx, AVSubtitle *sub)
{
Libaribb24Context *b24 = avctx->priv_data;
const arib_buf_region_t *region = arib_decoder_get_regions(b24->decoder);
unsigned int profile_font_size = get_profile_font_size(avctx->profile);
AVBPrint buf = { 0 };
int ret = 0;
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
while (region) {
ptrdiff_t region_length = region->p_end - region->p_start;
unsigned int ruby_region =
region->i_fontheight == (profile_font_size / 2);
// ASS requires us to make the colors BGR, so we convert here
int foreground_bgr_color = RGB_TO_BGR(region->i_foreground_color);
int background_bgr_color = RGB_TO_BGR(region->i_background_color);
if (region_length < 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid negative region length!\n");
ret = AVERROR_INVALIDDATA;
break;
}
if (region_length == 0 || (ruby_region && b24->aribb24_skip_ruby)) {
goto next_region;
}
// color and alpha
if (foreground_bgr_color != ASS_DEFAULT_COLOR)
av_bprintf(&buf, "{\\1c&H%06x&}", foreground_bgr_color);
if (region->i_foreground_alpha != 0)
av_bprintf(&buf, "{\\1a&H%02x&}", region->i_foreground_alpha);
if (background_bgr_color != ASS_DEFAULT_BACK_COLOR)
av_bprintf(&buf, "{\\3c&H%06x&}", background_bgr_color);
if (region->i_background_alpha != 0)
av_bprintf(&buf, "{\\3a&H%02x&}", region->i_background_alpha);
// font size
if (region->i_fontwidth != profile_font_size ||
region->i_fontheight != profile_font_size) {
av_bprintf(&buf, "{\\fscx%"PRId64"\\fscy%"PRId64"}",
av_rescale(region->i_fontwidth, 100,
profile_font_size),
av_rescale(region->i_fontheight, 100,
profile_font_size));
}
// TODO: positioning
av_bprint_append_data(&buf, region->p_start, region_length);
av_bprintf(&buf, "{\\r}");
next_region:
region = region->p_next;
}
if (!av_bprint_is_complete(&buf))
ret = AVERROR(ENOMEM);
if (ret == 0) {
av_log(avctx, AV_LOG_DEBUG, "Styled ASS line: %s\n",
buf.str);
ret = ff_ass_add_rect(sub, buf.str, b24->read_order++,
0, NULL, NULL);
}
av_bprint_finalize(&buf, NULL);
return ret;
}
static int libaribb24_decode(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *pkt)
{
Libaribb24Context *b24 = avctx->priv_data;
AVSubtitle *sub = data;
size_t parsed_data_size = 0;
size_t decoded_subtitle_size = 0;
const unsigned char *parsed_data = NULL;
char *decoded_subtitle = NULL;
time_t subtitle_duration = 0;
int ret = 0;
if (pkt->size <= 0)
return pkt->size;
arib_parse_pes(b24->parser, pkt->data, pkt->size);
parsed_data = arib_parser_get_data(b24->parser,
&parsed_data_size);
if (!parsed_data || !parsed_data_size) {
av_log(avctx, AV_LOG_DEBUG, "No decode'able data was received from "
"packet (dts: %"PRId64", pts: %"PRId64").\n",
pkt->dts, pkt->pts);
return pkt->size;
}
decoded_subtitle_size = parsed_data_size * 4;
if (!(decoded_subtitle = av_mallocz(decoded_subtitle_size + 1))) {
av_log(avctx, AV_LOG_ERROR,
"Failed to allocate buffer for decoded subtitle!\n");
return AVERROR(ENOMEM);
}
decoded_subtitle_size = arib_decode_buffer(b24->decoder,
parsed_data,
parsed_data_size,
decoded_subtitle,
decoded_subtitle_size);
subtitle_duration = arib_decoder_get_time(b24->decoder);
if (avctx->pkt_timebase.num && pkt->pts != AV_NOPTS_VALUE)
sub->pts = av_rescale_q(pkt->pts,
avctx->pkt_timebase, AV_TIME_BASE_Q);
sub->end_display_time = subtitle_duration ?
av_rescale_q(subtitle_duration,
AV_TIME_BASE_Q,
(AVRational){1, 1000}) :
UINT32_MAX;
av_log(avctx, AV_LOG_DEBUG,
"Result: '%s' (size: %zu, pkt_pts: %"PRId64", sub_pts: %"PRId64" "
"duration: %"PRIu32", pkt_timebase: %d/%d, time_base: %d/%d')\n",
decoded_subtitle ? decoded_subtitle : "<no subtitle>",
decoded_subtitle_size,
pkt->pts, sub->pts,
sub->end_display_time,
avctx->pkt_timebase.num, avctx->pkt_timebase.den,
avctx->time_base.num, avctx->time_base.den);
if (decoded_subtitle)
ret = libaribb24_handle_regions(avctx, sub);
*got_sub_ptr = sub->num_rects > 0;
av_free(decoded_subtitle);
// flush the region buffers, otherwise the linked list keeps getting
// longer and longer...
arib_finalize_decoder(b24->decoder);
return ret < 0 ? ret : pkt->size;
}
static void libaribb24_flush(AVCodecContext *avctx)
{
Libaribb24Context *b24 = avctx->priv_data;
if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
b24->read_order = 0;
}
#define OFFSET(x) offsetof(Libaribb24Context, x)
#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "aribb24-base-path", "set the base path for the libaribb24 library",
OFFSET(aribb24_base_path), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
{ "aribb24-skip-ruby-text", "skip ruby text blocks during decoding",
OFFSET(aribb24_skip_ruby), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, SD },
{ NULL }
};
static const AVClass aribb24_class = {
.class_name = "libaribb24 decoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVCodec ff_libaribb24_decoder = {
.name = "libaribb24",
.long_name = NULL_IF_CONFIG_SMALL("libaribb24 ARIB STD-B24 caption decoder"),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_ARIB_CAPTION,
.priv_data_size = sizeof(Libaribb24Context),
.init = libaribb24_init,
.close = libaribb24_close,
.decode = libaribb24_decode,
.flush = libaribb24_flush,
.priv_class= &aribb24_class,
.wrapper_name = "libaribb24",
};