ce7098b8f2
Fixes: 1080/clusterfuzz-testcase-5353236754071552 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
796 lines
24 KiB
C
796 lines
24 KiB
C
/*
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* DVD subtitle decoding
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* Copyright (c) 2005 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "libavutil/attributes.h"
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#include "libavutil/colorspace.h"
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#include "libavutil/opt.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bswap.h"
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typedef struct DVDSubContext
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{
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AVClass *class;
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uint32_t palette[16];
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char *palette_str;
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char *ifo_str;
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int has_palette;
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uint8_t colormap[4];
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uint8_t alpha[256];
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uint8_t buf[0x10000];
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int buf_size;
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int forced_subs_only;
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#ifdef DEBUG
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int sub_id;
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#endif
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} DVDSubContext;
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static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
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{
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const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
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uint8_t r, g, b;
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int i, y, cb, cr;
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int r_add, g_add, b_add;
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for (i = num_values; i > 0; i--) {
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y = *ycbcr++;
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cr = *ycbcr++;
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cb = *ycbcr++;
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YUV_TO_RGB1_CCIR(cb, cr);
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YUV_TO_RGB2_CCIR(r, g, b, y);
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*rgba++ = ((unsigned)*alpha++ << 24) | (r << 16) | (g << 8) | b;
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}
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}
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static int decode_run_2bit(GetBitContext *gb, int *color)
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{
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unsigned int v, t;
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v = 0;
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for (t = 1; v < t && t <= 0x40; t <<= 2)
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v = (v << 4) | get_bits(gb, 4);
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*color = v & 3;
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if (v < 4) { /* Code for fill rest of line */
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return INT_MAX;
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}
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return v >> 2;
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}
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static int decode_run_8bit(GetBitContext *gb, int *color)
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{
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int len;
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int has_run = get_bits1(gb);
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if (get_bits1(gb))
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*color = get_bits(gb, 8);
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else
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*color = get_bits(gb, 2);
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if (has_run) {
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if (get_bits1(gb)) {
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len = get_bits(gb, 7);
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if (len == 0)
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len = INT_MAX;
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else
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len += 9;
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} else
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len = get_bits(gb, 3) + 2;
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} else
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len = 1;
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return len;
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}
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static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
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const uint8_t *buf, int start, int buf_size, int is_8bit)
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{
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GetBitContext gb;
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int bit_len;
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int x, y, len, color;
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uint8_t *d;
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if (start >= buf_size)
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return -1;
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if (w <= 0 || h <= 0)
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return -1;
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bit_len = (buf_size - start) * 8;
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init_get_bits(&gb, buf + start, bit_len);
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x = 0;
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y = 0;
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d = bitmap;
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for(;;) {
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if (get_bits_count(&gb) > bit_len)
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return -1;
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if (is_8bit)
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len = decode_run_8bit(&gb, &color);
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else
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len = decode_run_2bit(&gb, &color);
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len = FFMIN(len, w - x);
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memset(d + x, color, len);
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x += len;
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if (x >= w) {
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y++;
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if (y >= h)
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break;
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d += linesize;
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x = 0;
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/* byte align */
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align_get_bits(&gb);
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}
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}
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return 0;
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}
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static void guess_palette(DVDSubContext* ctx,
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uint32_t *rgba_palette,
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uint32_t subtitle_color)
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{
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static const uint8_t level_map[4][4] = {
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// this configuration (full range, lowest to highest) in tests
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// seemed most common, so assume this
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{0xff},
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{0x00, 0xff},
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{0x00, 0x80, 0xff},
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{0x00, 0x55, 0xaa, 0xff},
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};
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uint8_t color_used[16] = { 0 };
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int nb_opaque_colors, i, level, j, r, g, b;
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uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
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if(ctx->has_palette) {
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for(i = 0; i < 4; i++)
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rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
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| ((alpha[i] * 17U) << 24);
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return;
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}
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for(i = 0; i < 4; i++)
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rgba_palette[i] = 0;
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nb_opaque_colors = 0;
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for(i = 0; i < 4; i++) {
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if (alpha[i] != 0 && !color_used[colormap[i]]) {
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color_used[colormap[i]] = 1;
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nb_opaque_colors++;
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}
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}
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if (nb_opaque_colors == 0)
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return;
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j = 0;
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memset(color_used, 0, 16);
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for(i = 0; i < 4; i++) {
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if (alpha[i] != 0) {
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if (!color_used[colormap[i]]) {
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level = level_map[nb_opaque_colors - 1][j];
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r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
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g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
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b = (((subtitle_color >> 0) & 0xff) * level) >> 8;
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rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17U) << 24);
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color_used[colormap[i]] = (i + 1);
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j++;
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} else {
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rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
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((alpha[i] * 17U) << 24);
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}
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}
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}
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}
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static void reset_rects(AVSubtitle *sub_header)
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{
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int i;
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if (sub_header->rects) {
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for (i = 0; i < sub_header->num_rects; i++) {
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av_freep(&sub_header->rects[i]->data[0]);
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av_freep(&sub_header->rects[i]->data[1]);
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av_freep(&sub_header->rects[i]);
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}
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av_freep(&sub_header->rects);
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sub_header->num_rects = 0;
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}
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}
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#define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
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static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
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const uint8_t *buf, int buf_size)
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{
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int cmd_pos, pos, cmd, x1, y1, x2, y2, next_cmd_pos;
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int big_offsets, offset_size, is_8bit = 0;
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const uint8_t *yuv_palette = NULL;
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uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
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int date;
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int i;
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int is_menu = 0;
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uint32_t size;
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int64_t offset1, offset2;
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if (buf_size < 10)
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return -1;
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if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
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big_offsets = 1;
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offset_size = 4;
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cmd_pos = 6;
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} else {
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big_offsets = 0;
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offset_size = 2;
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cmd_pos = 2;
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}
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size = READ_OFFSET(buf + (big_offsets ? 2 : 0));
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cmd_pos = READ_OFFSET(buf + cmd_pos);
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if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) {
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if (cmd_pos > size) {
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av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n");
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return 0;
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}
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return AVERROR(EAGAIN);
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}
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while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {
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date = AV_RB16(buf + cmd_pos);
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next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);
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ff_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",
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cmd_pos, next_cmd_pos, date);
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pos = cmd_pos + 2 + offset_size;
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offset1 = -1;
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offset2 = -1;
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x1 = y1 = x2 = y2 = 0;
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while (pos < buf_size) {
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cmd = buf[pos++];
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ff_dlog(NULL, "cmd=%02x\n", cmd);
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switch(cmd) {
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case 0x00:
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/* menu subpicture */
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is_menu = 1;
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break;
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case 0x01:
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/* set start date */
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sub_header->start_display_time = (date << 10) / 90;
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break;
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case 0x02:
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/* set end date */
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sub_header->end_display_time = (date << 10) / 90;
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break;
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case 0x03:
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/* set colormap */
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if ((buf_size - pos) < 2)
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goto fail;
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colormap[3] = buf[pos] >> 4;
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colormap[2] = buf[pos] & 0x0f;
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colormap[1] = buf[pos + 1] >> 4;
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colormap[0] = buf[pos + 1] & 0x0f;
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pos += 2;
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break;
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case 0x04:
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/* set alpha */
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if ((buf_size - pos) < 2)
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goto fail;
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alpha[3] = buf[pos] >> 4;
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alpha[2] = buf[pos] & 0x0f;
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alpha[1] = buf[pos + 1] >> 4;
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alpha[0] = buf[pos + 1] & 0x0f;
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pos += 2;
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ff_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
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break;
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case 0x05:
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case 0x85:
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if ((buf_size - pos) < 6)
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goto fail;
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x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
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x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
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y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
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y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
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if (cmd & 0x80)
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is_8bit = 1;
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ff_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);
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pos += 6;
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break;
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case 0x06:
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if ((buf_size - pos) < 4)
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goto fail;
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offset1 = AV_RB16(buf + pos);
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offset2 = AV_RB16(buf + pos + 2);
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ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
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pos += 4;
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break;
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case 0x86:
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if ((buf_size - pos) < 8)
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goto fail;
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offset1 = AV_RB32(buf + pos);
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offset2 = AV_RB32(buf + pos + 4);
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ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\n", offset1, offset2);
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pos += 8;
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break;
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case 0x83:
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/* HD set palette */
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if ((buf_size - pos) < 768)
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goto fail;
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yuv_palette = buf + pos;
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pos += 768;
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break;
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case 0x84:
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/* HD set contrast (alpha) */
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if ((buf_size - pos) < 256)
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goto fail;
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for (i = 0; i < 256; i++)
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alpha[i] = 0xFF - buf[pos+i];
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pos += 256;
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break;
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case 0xff:
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goto the_end;
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default:
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ff_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);
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goto the_end;
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}
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}
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the_end:
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if (offset1 >= buf_size || offset2 >= buf_size)
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goto fail;
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if (offset1 >= 0 && offset2 >= 0) {
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int w, h;
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uint8_t *bitmap;
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/* decode the bitmap */
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w = x2 - x1 + 1;
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if (w < 0)
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w = 0;
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h = y2 - y1 + 1;
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if (h < 0)
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h = 0;
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if (w > 0 && h > 1) {
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reset_rects(sub_header);
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sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
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if (!sub_header->rects)
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goto fail;
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sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));
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if (!sub_header->rects[0])
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goto fail;
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sub_header->num_rects = 1;
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bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h);
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if (!bitmap)
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goto fail;
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if (decode_rle(bitmap, w * 2, w, (h + 1) / 2,
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buf, offset1, buf_size, is_8bit) < 0)
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goto fail;
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if (decode_rle(bitmap + w, w * 2, w, h / 2,
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buf, offset2, buf_size, is_8bit) < 0)
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goto fail;
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sub_header->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE);
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if (!sub_header->rects[0]->data[1])
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goto fail;
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if (is_8bit) {
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if (!yuv_palette)
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goto fail;
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sub_header->rects[0]->nb_colors = 256;
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yuv_a_to_rgba(yuv_palette, alpha,
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(uint32_t *)sub_header->rects[0]->data[1],
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256);
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} else {
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sub_header->rects[0]->nb_colors = 4;
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guess_palette(ctx, (uint32_t*)sub_header->rects[0]->data[1],
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0xffff00);
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}
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sub_header->rects[0]->x = x1;
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sub_header->rects[0]->y = y1;
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sub_header->rects[0]->w = w;
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sub_header->rects[0]->h = h;
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sub_header->rects[0]->type = SUBTITLE_BITMAP;
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sub_header->rects[0]->linesize[0] = w;
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sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
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#if FF_API_AVPICTURE
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FF_DISABLE_DEPRECATION_WARNINGS
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for (i = 0; i < 4; i++) {
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sub_header->rects[0]->pict.data[i] = sub_header->rects[0]->data[i];
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sub_header->rects[0]->pict.linesize[i] = sub_header->rects[0]->linesize[i];
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}
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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}
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}
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if (next_cmd_pos < cmd_pos) {
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av_log(ctx, AV_LOG_ERROR, "Invalid command offset\n");
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break;
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}
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if (next_cmd_pos == cmd_pos)
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break;
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cmd_pos = next_cmd_pos;
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}
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if (sub_header->num_rects > 0)
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return is_menu;
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fail:
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reset_rects(sub_header);
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return -1;
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}
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static int is_transp(const uint8_t *buf, int pitch, int n,
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const uint8_t *transp_color)
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{
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int i;
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for(i = 0; i < n; i++) {
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if (!transp_color[*buf])
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return 0;
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buf += pitch;
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}
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return 1;
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}
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/* return 0 if empty rectangle, 1 if non empty */
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static int find_smallest_bounding_rectangle(AVSubtitle *s)
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{
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uint8_t transp_color[256] = { 0 };
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int y1, y2, x1, x2, y, w, h, i;
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uint8_t *bitmap;
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if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
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return 0;
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for(i = 0; i < s->rects[0]->nb_colors; i++) {
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if ((((uint32_t *)s->rects[0]->data[1])[i] >> 24) == 0)
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transp_color[i] = 1;
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}
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y1 = 0;
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while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0],
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1, s->rects[0]->w, transp_color))
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y1++;
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if (y1 == s->rects[0]->h) {
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av_freep(&s->rects[0]->data[0]);
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s->rects[0]->w = s->rects[0]->h = 0;
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return 0;
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}
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y2 = s->rects[0]->h - 1;
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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;
|
|
|
|
#if FF_API_AVPICTURE
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
for (i = 0; i < 4; i++) {
|
|
s->rects[0]->pict.data[i] = s->rects[0]->data[i];
|
|
s->rects[0]->pict.linesize[i] = s->rects[0]->linesize[i];
|
|
}
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#endif
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
#define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255)
|
|
static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
|
|
uint32_t *rgba_palette)
|
|
{
|
|
int x, y, alpha;
|
|
uint32_t v;
|
|
int back[3] = {0, 255, 0}; /* green background */
|
|
FILE *f;
|
|
|
|
f = fopen(filename, "w");
|
|
if (!f) {
|
|
perror(filename);
|
|
return;
|
|
}
|
|
fprintf(f, "P6\n"
|
|
"%d %d\n"
|
|
"%d\n",
|
|
w, h, 255);
|
|
for(y = 0; y < h; y++) {
|
|
for(x = 0; x < w; x++) {
|
|
v = rgba_palette[bitmap[y * w + x]];
|
|
alpha = v >> 24;
|
|
putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f);
|
|
putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f);
|
|
putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f);
|
|
}
|
|
}
|
|
fclose(f);
|
|
}
|
|
#endif
|
|
|
|
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,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
DVDSubContext *ctx = avctx->priv_data;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
AVSubtitle *sub = data;
|
|
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) {
|
|
no_subtitle:
|
|
reset_rects(sub);
|
|
*data_size = 0;
|
|
|
|
return buf_size;
|
|
}
|
|
if (!is_menu && find_smallest_bounding_rectangle(sub) == 0)
|
|
goto no_subtitle;
|
|
|
|
if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED))
|
|
goto no_subtitle;
|
|
|
|
#if defined(DEBUG)
|
|
{
|
|
char ppm_name[32];
|
|
|
|
snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++);
|
|
ff_dlog(NULL, "start=%d ms end =%d ms\n",
|
|
sub->start_display_time,
|
|
sub->end_display_time);
|
|
ppm_save(ppm_name, sub->rects[0]->data[0],
|
|
sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->data[1]);
|
|
}
|
|
#endif
|
|
|
|
ctx->buf_size = 0;
|
|
*data_size = 1;
|
|
return buf_size;
|
|
}
|
|
|
|
static void parse_palette(DVDSubContext *ctx, char *p)
|
|
{
|
|
int i;
|
|
|
|
ctx->has_palette = 1;
|
|
for(i=0;i<16;i++) {
|
|
ctx->palette[i] = strtoul(p, &p, 16);
|
|
while(*p == ',' || av_isspace(*p))
|
|
p++;
|
|
}
|
|
}
|
|
|
|
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 = fopen(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) {
|
|
parse_palette(ctx, 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)
|
|
parse_palette(ctx, 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;
|
|
}
|
|
|
|
static av_cold int dvdsub_close(AVCodecContext *avctx)
|
|
{
|
|
dvdsub_flush(avctx);
|
|
return 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,
|
|
};
|
|
|
|
AVCodec ff_dvdsub_decoder = {
|
|
.name = "dvdsub",
|
|
.long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
|
|
.type = AVMEDIA_TYPE_SUBTITLE,
|
|
.id = AV_CODEC_ID_DVD_SUBTITLE,
|
|
.priv_data_size = sizeof(DVDSubContext),
|
|
.init = dvdsub_init,
|
|
.decode = dvdsub_decode,
|
|
.flush = dvdsub_flush,
|
|
.close = dvdsub_close,
|
|
.priv_class = &dvdsub_class,
|
|
};
|