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FFmpeg/libavcodec/dvdsubdec.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* DVD subtitle decoding
* Copyright (c) 2005 Fabrice Bellard
*
* 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 "decode.h"
#include "dvdsub.h"
#include "get_bits.h"
#include "libavutil/attributes.h"
#include "libavutil/colorspace.h"
#include "libavutil/file_open.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/bswap.h"
typedef struct DVDSubContext
{
AVClass *class;
uint32_t palette[16];
char *palette_str;
char *ifo_str;
int has_palette;
uint8_t colormap[4];
uint8_t alpha[256];
uint8_t buf[0x10000];
int buf_size;
int forced_subs_only;
uint8_t used_color[256];
} DVDSubContext;
static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
{
const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
uint8_t r, g, b;
int i, y, cb, cr;
int r_add, g_add, b_add;
for (i = num_values; i > 0; i--) {
y = *ycbcr++;
cr = *ycbcr++;
cb = *ycbcr++;
YUV_TO_RGB1_CCIR(cb, cr);
YUV_TO_RGB2_CCIR(r, g, b, y);
*rgba++ = ((unsigned)*alpha++ << 24) | (r << 16) | (g << 8) | b;
}
}
static int decode_run_2bit(GetBitContext *gb, int *color)
{
unsigned int v, t;
v = 0;
for (t = 1; v < t && t <= 0x40; t <<= 2)
v = (v << 4) | get_bits(gb, 4);
*color = v & 3;
if (v < 4) { /* Code for fill rest of line */
return INT_MAX;
}
return v >> 2;
}
static int decode_run_8bit(GetBitContext *gb, int *color)
{
int len;
int has_run = get_bits1(gb);
*color = get_bits(gb, 2 + 6*get_bits1(gb));
if (has_run) {
if (get_bits1(gb)) {
len = get_bits(gb, 7);
if (len == 0)
len = INT_MAX;
else
len += 9;
} else
len = get_bits(gb, 3) + 2;
} else
len = 1;
return len;
}
static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, uint8_t used_color[256],
const uint8_t *buf, int start, int buf_size, int is_8bit)
{
GetBitContext gb;
int bit_len;
int x, y, len, color;
uint8_t *d;
if (start >= buf_size)
return -1;
if (w <= 0 || h <= 0)
return -1;
bit_len = (buf_size - start) * 8;
init_get_bits(&gb, buf + start, bit_len);
x = 0;
y = 0;
d = bitmap;
for(;;) {
if (get_bits_count(&gb) > bit_len)
return -1;
if (is_8bit)
len = decode_run_8bit(&gb, &color);
else
len = decode_run_2bit(&gb, &color);
if (len != INT_MAX && len > w - x)
return AVERROR_INVALIDDATA;
len = FFMIN(len, w - x);
memset(d + x, color, len);
used_color[color] = 1;
x += len;
if (x >= w) {
y++;
if (y >= h)
break;
d += linesize;
x = 0;
/* byte align */
align_get_bits(&gb);
}
}
return 0;
}
static void guess_palette(DVDSubContext* ctx,
uint32_t *rgba_palette,
uint32_t subtitle_color)
{
static const uint8_t level_map[4][4] = {
// this configuration (full range, lowest to highest) in tests
// seemed most common, so assume this
{0xff},
{0x00, 0xff},
{0x00, 0x80, 0xff},
{0x00, 0x55, 0xaa, 0xff},
};
uint8_t color_used[16] = { 0 };
int nb_opaque_colors, i, level, j, r, g, b;
uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
if(ctx->has_palette) {
for(i = 0; i < 4; i++)
rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
| ((alpha[i] * 17U) << 24);
return;
}
for(i = 0; i < 4; i++)
rgba_palette[i] = 0;
nb_opaque_colors = 0;
for(i = 0; i < 4; i++) {
if (alpha[i] != 0 && !color_used[colormap[i]]) {
color_used[colormap[i]] = 1;
nb_opaque_colors++;
}
}
if (nb_opaque_colors == 0)
return;
j = 0;
memset(color_used, 0, 16);
for(i = 0; i < 4; i++) {
if (alpha[i] != 0) {
if (!color_used[colormap[i]]) {
level = level_map[nb_opaque_colors - 1][j];
r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
b = (((subtitle_color >> 0) & 0xff) * level) >> 8;
rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17U) << 24);
color_used[colormap[i]] = (i + 1);
j++;
} else {
rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
((alpha[i] * 17U) << 24);
}
}
}
}
static void reset_rects(AVSubtitle *sub_header)
{
int i;
if (sub_header->rects) {
for (i = 0; i < sub_header->num_rects; i++) {
av_freep(&sub_header->rects[i]->data[0]);
av_freep(&sub_header->rects[i]->data[1]);
av_freep(&sub_header->rects[i]);
}
av_freep(&sub_header->rects);
sub_header->num_rects = 0;
}
}
#define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
const uint8_t *buf, int buf_size)
{
int cmd_pos, pos, cmd, x1, y1, x2, y2, next_cmd_pos;
int big_offsets, offset_size, is_8bit = 0;
const uint8_t *yuv_palette = NULL;
uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
int date;
int i;
int is_menu = 0;
uint32_t size;
int64_t offset1, offset2;
if (buf_size < 10)
return -1;
if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
big_offsets = 1;
offset_size = 4;
cmd_pos = 6;
} else {
big_offsets = 0;
offset_size = 2;
cmd_pos = 2;
}
size = READ_OFFSET(buf + (big_offsets ? 2 : 0));
cmd_pos = READ_OFFSET(buf + cmd_pos);
if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) {
if (cmd_pos > size) {
av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n");
return 0;
}
return AVERROR(EAGAIN);
}
while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {
date = AV_RB16(buf + cmd_pos);
next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);
ff_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",
cmd_pos, next_cmd_pos, date);
pos = cmd_pos + 2 + offset_size;
offset1 = -1;
offset2 = -1;
x1 = y1 = x2 = y2 = 0;
while (pos < buf_size) {
cmd = buf[pos++];
ff_dlog(NULL, "cmd=%02x\n", cmd);
switch(cmd) {
case 0x00:
/* menu subpicture */
is_menu = 1;
break;
case 0x01:
/* set start date */
sub_header->start_display_time = (date << 10) / 90;
break;
case 0x02:
/* set end date */
sub_header->end_display_time = (date << 10) / 90;
break;
case 0x03:
/* set colormap */
if ((buf_size - pos) < 2)
goto fail;
colormap[3] = buf[pos] >> 4;
colormap[2] = buf[pos] & 0x0f;
colormap[1] = buf[pos + 1] >> 4;
colormap[0] = buf[pos + 1] & 0x0f;
pos += 2;
break;
case 0x04:
/* set alpha */
if ((buf_size - pos) < 2)
goto fail;
alpha[3] = buf[pos] >> 4;
alpha[2] = buf[pos] & 0x0f;
alpha[1] = buf[pos + 1] >> 4;
alpha[0] = buf[pos + 1] & 0x0f;
pos += 2;
ff_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
break;
case 0x05:
case 0x85:
if ((buf_size - pos) < 6)
goto fail;
x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
if (cmd & 0x80)
is_8bit = 1;
ff_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);
pos += 6;
break;
case 0x06:
if ((buf_size - pos) < 4)
goto fail;
offset1 = AV_RB16(buf + pos);
offset2 = AV_RB16(buf + pos + 2);
ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
pos += 4;
break;
case 0x86:
if ((buf_size - pos) < 8)
goto fail;
offset1 = AV_RB32(buf + pos);
offset2 = AV_RB32(buf + pos + 4);
ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
pos += 8;
break;
case 0x83:
/* HD set palette */
if ((buf_size - pos) < 768)
goto fail;
yuv_palette = buf + pos;
pos += 768;
break;
case 0x84:
/* HD set contrast (alpha) */
if ((buf_size - pos) < 256)
goto fail;
for (i = 0; i < 256; i++)
alpha[i] = 0xFF - buf[pos+i];
pos += 256;
break;
case 0xff:
goto the_end;
default:
ff_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);
goto the_end;
}
}
the_end:
if (offset1 >= buf_size || offset2 >= buf_size)
goto fail;
if (offset1 >= 0 && offset2 >= 0) {
int w, h;
uint8_t *bitmap;
/* decode the bitmap */
w = x2 - x1 + 1;
if (w < 0)
w = 0;
h = y2 - y1 + 1;
if (h < 0)
h = 0;
if (w > 0 && h > 1) {
reset_rects(sub_header);
memset(ctx->used_color, 0, sizeof(ctx->used_color));
sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
if (!sub_header->rects)
goto fail;
sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));
if (!sub_header->rects[0])
goto fail;
sub_header->num_rects = 1;
bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h);
if (!bitmap)
goto fail;
if (decode_rle(bitmap, w * 2, w, (h + 1) / 2, ctx->used_color,
buf, offset1, buf_size, is_8bit) < 0)
goto fail;
if (decode_rle(bitmap + w, w * 2, w, h / 2, ctx->used_color,
buf, offset2, buf_size, is_8bit) < 0)
goto fail;
sub_header->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE);
if (!sub_header->rects[0]->data[1])
goto fail;
if (is_8bit) {
if (!yuv_palette)
goto fail;
sub_header->rects[0]->nb_colors = 256;
yuv_a_to_rgba(yuv_palette, alpha,
(uint32_t *)sub_header->rects[0]->data[1],
256);
} else {
sub_header->rects[0]->nb_colors = 4;
guess_palette(ctx, (uint32_t*)sub_header->rects[0]->data[1],
0xffffff);
}
sub_header->rects[0]->x = x1;
sub_header->rects[0]->y = y1;
sub_header->rects[0]->w = w;
sub_header->rects[0]->h = h;
sub_header->rects[0]->type = SUBTITLE_BITMAP;
sub_header->rects[0]->linesize[0] = w;
sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
}
}
if (next_cmd_pos < cmd_pos) {
av_log(ctx, AV_LOG_ERROR, "Invalid command offset\n");
break;
}
if (next_cmd_pos == cmd_pos)
break;
cmd_pos = next_cmd_pos;
}
if (sub_header->num_rects > 0)
return is_menu;
fail:
reset_rects(sub_header);
return -1;
}
static int is_transp(const uint8_t *buf, int pitch, int n,
const uint8_t *transp_color)
{
int i;
for(i = 0; i < n; i++) {
if (!transp_color[*buf])
return 0;
buf += pitch;
}
return 1;
}
/* return 0 if empty rectangle, 1 if non empty */
static int find_smallest_bounding_rectangle(DVDSubContext *ctx, AVSubtitle *s)
{
uint8_t transp_color[256] = { 0 };
int y1, y2, x1, x2, y, w, h, i;
uint8_t *bitmap;
int transparent = 1;
if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
return 0;
for(i = 0; i < s->rects[0]->nb_colors; i++) {
if ((((uint32_t *)s->rects[0]->data[1])[i] >> 24) == 0) {
transp_color[i] = 1;
} else if (ctx->used_color[i])
transparent = 0;
}
if (transparent)
return 0;
y1 = 0;
while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0],
1, s->rects[0]->w, transp_color))
y1++;
if (y1 == s->rects[0]->h) {
av_freep(&s->rects[0]->data[0]);
s->rects[0]->w = s->rects[0]->h = 0;
return 0;
}
y2 = s->rects[0]->h - 1;
while (y2 > 0 && is_transp(s->rects[0]->data[0] + y2 * s->rects[0]->linesize[0], 1,
s->rects[0]->w, transp_color))
y2--;
x1 = 0;
while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->data[0] + x1, s->rects[0]->linesize[0],
s->rects[0]->h, transp_color))
x1++;
x2 = s->rects[0]->w - 1;
while (x2 > 0 && is_transp(s->rects[0]->data[0] + x2, s->rects[0]->linesize[0], s->rects[0]->h,
transp_color))
x2--;
w = x2 - x1 + 1;
h = y2 - y1 + 1;
bitmap = av_malloc(w * h);
if (!bitmap)
return 1;
for(y = 0; y < h; y++) {
memcpy(bitmap + w * y, s->rects[0]->data[0] + x1 + (y1 + y) * s->rects[0]->linesize[0], w);
}
av_freep(&s->rects[0]->data[0]);
s->rects[0]->data[0] = bitmap;
s->rects[0]->linesize[0] = w;
s->rects[0]->w = w;
s->rects[0]->h = h;
s->rects[0]->x += x1;
s->rects[0]->y += y1;
return 1;
}
static int append_to_cached_buf(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
DVDSubContext *ctx = avctx->priv_data;
av_assert0(buf_size >= 0 && ctx->buf_size <= sizeof(ctx->buf));
if (buf_size >= sizeof(ctx->buf) - ctx->buf_size) {
av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "
"too large SPU packets aborted.\n");
ctx->buf_size = 0;
return AVERROR_INVALIDDATA;
}
memcpy(ctx->buf + ctx->buf_size, buf, buf_size);
ctx->buf_size += buf_size;
return 0;
}
static int dvdsub_decode(AVCodecContext *avctx, AVSubtitle *sub,
int *data_size, const AVPacket *avpkt)
{
DVDSubContext *ctx = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int appended = 0;
int is_menu;
if (ctx->buf_size) {
int ret = append_to_cached_buf(avctx, buf, buf_size);
if (ret < 0) {
*data_size = 0;
return ret;
}
buf = ctx->buf;
buf_size = ctx->buf_size;
appended = 1;
}
is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
if (is_menu == AVERROR(EAGAIN)) {
*data_size = 0;
return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size);
}
if (is_menu < 0) {
ctx->buf_size = 0;
no_subtitle:
reset_rects(sub);
*data_size = 0;
return buf_size;
}
if (!is_menu && find_smallest_bounding_rectangle(ctx, sub) == 0)
goto no_subtitle;
if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED))
goto no_subtitle;
ctx->buf_size = 0;
*data_size = 1;
return buf_size;
}
static int parse_ifo_palette(DVDSubContext *ctx, char *p)
{
FILE *ifo;
char ifostr[12];
uint32_t sp_pgci, pgci, off_pgc, pgc;
uint8_t r, g, b, yuv[65], *buf;
int i, y, cb, cr, r_add, g_add, b_add;
int ret = 0;
const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
ctx->has_palette = 0;
if ((ifo = avpriv_fopen_utf8(p, "r")) == NULL) {
av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno)));
return AVERROR_EOF;
}
if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {
av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);
ret = AVERROR_INVALIDDATA;
goto end;
}
if (fseek(ifo, 0xCC, SEEK_SET) == -1) {
ret = AVERROR(errno);
goto end;
}
if (fread(&sp_pgci, 4, 1, ifo) == 1) {
pgci = av_be2ne32(sp_pgci) * 2048;
if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) {
ret = AVERROR(errno);
goto end;
}
if (fread(&off_pgc, 4, 1, ifo) == 1) {
pgc = pgci + av_be2ne32(off_pgc);
if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) {
ret = AVERROR(errno);
goto end;
}
if (fread(yuv, 64, 1, ifo) == 1) {
buf = yuv;
for(i=0; i<16; i++) {
y = *++buf;
cr = *++buf;
cb = *++buf;
YUV_TO_RGB1_CCIR(cb, cr);
YUV_TO_RGB2_CCIR(r, g, b, y);
ctx->palette[i] = (r << 16) + (g << 8) + b;
buf++;
}
ctx->has_palette = 1;
}
}
}
if (ctx->has_palette == 0) {
av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);
ret = AVERROR_INVALIDDATA;
}
end:
fclose(ifo);
return ret;
}
static int dvdsub_parse_extradata(AVCodecContext *avctx)
{
DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
char *dataorig, *data;
int ret = 1;
if (!avctx->extradata || !avctx->extradata_size)
return 1;
dataorig = data = av_malloc(avctx->extradata_size+1);
if (!data)
return AVERROR(ENOMEM);
memcpy(data, avctx->extradata, avctx->extradata_size);
data[avctx->extradata_size] = '\0';
for(;;) {
int pos = strcspn(data, "\n\r");
if (pos==0 && *data==0)
break;
if (strncmp("palette:", data, 8) == 0) {
ctx->has_palette = 1;
ff_dvdsub_parse_palette(ctx->palette, data + 8);
} else if (strncmp("size:", data, 5) == 0) {
int w, h;
if (sscanf(data + 5, "%dx%d", &w, &h) == 2) {
ret = ff_set_dimensions(avctx, w, h);
if (ret < 0)
goto fail;
}
}
data += pos;
data += strspn(data, "\n\r");
}
fail:
av_free(dataorig);
return ret;
}
static av_cold int dvdsub_init(AVCodecContext *avctx)
{
DVDSubContext *ctx = avctx->priv_data;
int ret;
if ((ret = dvdsub_parse_extradata(avctx)) < 0)
return ret;
if (ctx->ifo_str)
parse_ifo_palette(ctx, ctx->ifo_str);
if (ctx->palette_str) {
ctx->has_palette = 1;
ff_dvdsub_parse_palette(ctx->palette, ctx->palette_str);
}
if (ctx->has_palette) {
int i;
av_log(avctx, AV_LOG_DEBUG, "palette:");
for(i=0;i<16;i++)
av_log(avctx, AV_LOG_DEBUG, " 0x%06"PRIx32, ctx->palette[i]);
av_log(avctx, AV_LOG_DEBUG, "\n");
}
return 1;
}
static void dvdsub_flush(AVCodecContext *avctx)
{
DVDSubContext *ctx = avctx->priv_data;
ctx->buf_size = 0;
}
#define OFFSET(field) offsetof(DVDSubContext, field)
#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
{ "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
{ "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD},
{ NULL }
};
static const AVClass dvdsub_class = {
.class_name = "dvdsubdec",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_dvdsub_decoder = {
.p.name = "dvdsub",
CODEC_LONG_NAME("DVD subtitles"),
.p.type = AVMEDIA_TYPE_SUBTITLE,
.p.id = AV_CODEC_ID_DVD_SUBTITLE,
.priv_data_size = sizeof(DVDSubContext),
.init = dvdsub_init,
FF_CODEC_DECODE_SUB_CB(dvdsub_decode),
.flush = dvdsub_flush,
.p.priv_class = &dvdsub_class,
};
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