yading@10: /*
yading@10:  * DVD subtitle decoding
yading@10:  * Copyright (c) 2005 Fabrice Bellard
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: #include "dsputil.h"
yading@10: #include "libavutil/colorspace.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/avstring.h"
yading@10: 
yading@10: //#define DEBUG
yading@10: 
yading@10: typedef struct DVDSubContext
yading@10: {
yading@10:   AVClass *class;
yading@10:   uint32_t palette[16];
yading@10:   char    *palette_str;
yading@10:   int      has_palette;
yading@10:   uint8_t  colormap[4];
yading@10:   uint8_t  alpha[256];
yading@10: } DVDSubContext;
yading@10: 
yading@10: static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
yading@10: {
yading@10:     const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
yading@10:     uint8_t r, g, b;
yading@10:     int i, y, cb, cr;
yading@10:     int r_add, g_add, b_add;
yading@10: 
yading@10:     for (i = num_values; i > 0; i--) {
yading@10:         y = *ycbcr++;
yading@10:         cr = *ycbcr++;
yading@10:         cb = *ycbcr++;
yading@10:         YUV_TO_RGB1_CCIR(cb, cr);
yading@10:         YUV_TO_RGB2_CCIR(r, g, b, y);
yading@10:         *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int decode_run_2bit(GetBitContext *gb, int *color)
yading@10: {
yading@10:     unsigned int v, t;
yading@10: 
yading@10:     v = 0;
yading@10:     for (t = 1; v < t && t <= 0x40; t <<= 2)
yading@10:         v = (v << 4) | get_bits(gb, 4);
yading@10:     *color = v & 3;
yading@10:     if (v < 4) { /* Code for fill rest of line */
yading@10:         return INT_MAX;
yading@10:     }
yading@10:     return v >> 2;
yading@10: }
yading@10: 
yading@10: static int decode_run_8bit(GetBitContext *gb, int *color)
yading@10: {
yading@10:     int len;
yading@10:     int has_run = get_bits1(gb);
yading@10:     if (get_bits1(gb))
yading@10:         *color = get_bits(gb, 8);
yading@10:     else
yading@10:         *color = get_bits(gb, 2);
yading@10:     if (has_run) {
yading@10:         if (get_bits1(gb)) {
yading@10:             len = get_bits(gb, 7);
yading@10:             if (len == 0)
yading@10:                 len = INT_MAX;
yading@10:             else
yading@10:                 len += 9;
yading@10:         } else
yading@10:             len = get_bits(gb, 3) + 2;
yading@10:     } else
yading@10:         len = 1;
yading@10:     return len;
yading@10: }
yading@10: 
yading@10: static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
yading@10:                       const uint8_t *buf, int start, int buf_size, int is_8bit)
yading@10: {
yading@10:     GetBitContext gb;
yading@10:     int bit_len;
yading@10:     int x, y, len, color;
yading@10:     uint8_t *d;
yading@10: 
yading@10:     bit_len = (buf_size - start) * 8;
yading@10:     init_get_bits(&gb, buf + start, bit_len);
yading@10: 
yading@10:     x = 0;
yading@10:     y = 0;
yading@10:     d = bitmap;
yading@10:     for(;;) {
yading@10:         if (get_bits_count(&gb) > bit_len)
yading@10:             return -1;
yading@10:         if (is_8bit)
yading@10:             len = decode_run_8bit(&gb, &color);
yading@10:         else
yading@10:             len = decode_run_2bit(&gb, &color);
yading@10:         len = FFMIN(len, w - x);
yading@10:         memset(d + x, color, len);
yading@10:         x += len;
yading@10:         if (x >= w) {
yading@10:             y++;
yading@10:             if (y >= h)
yading@10:                 break;
yading@10:             d += linesize;
yading@10:             x = 0;
yading@10:             /* byte align */
yading@10:             align_get_bits(&gb);
yading@10:         }
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void guess_palette(DVDSubContext* ctx,
yading@10:                           uint32_t *rgba_palette,
yading@10:                           uint32_t subtitle_color)
yading@10: {
yading@10:     static const uint8_t level_map[4][4] = {
yading@10:         // this configuration (full range, lowest to highest) in tests
yading@10:         // seemed most common, so assume this
yading@10:         {0xff},
yading@10:         {0x00, 0xff},
yading@10:         {0x00, 0x80, 0xff},
yading@10:         {0x00, 0x55, 0xaa, 0xff},
yading@10:     };
yading@10:     uint8_t color_used[16] = { 0 };
yading@10:     int nb_opaque_colors, i, level, j, r, g, b;
yading@10:     uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
yading@10: 
yading@10:     if(ctx->has_palette) {
yading@10:         for(i = 0; i < 4; i++)
yading@10:             rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
yading@10:                               | ((alpha[i] * 17U) << 24);
yading@10:         return;
yading@10:     }
yading@10: 
yading@10:     for(i = 0; i < 4; i++)
yading@10:         rgba_palette[i] = 0;
yading@10: 
yading@10:     nb_opaque_colors = 0;
yading@10:     for(i = 0; i < 4; i++) {
yading@10:         if (alpha[i] != 0 && !color_used[colormap[i]]) {
yading@10:             color_used[colormap[i]] = 1;
yading@10:             nb_opaque_colors++;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (nb_opaque_colors == 0)
yading@10:         return;
yading@10: 
yading@10:     j = 0;
yading@10:     memset(color_used, 0, 16);
yading@10:     for(i = 0; i < 4; i++) {
yading@10:         if (alpha[i] != 0) {
yading@10:             if (!color_used[colormap[i]])  {
yading@10:                 level = level_map[nb_opaque_colors][j];
yading@10:                 r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
yading@10:                 g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
yading@10:                 b = (((subtitle_color >> 0) & 0xff) * level) >> 8;
yading@10:                 rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17) << 24);
yading@10:                 color_used[colormap[i]] = (i + 1);
yading@10:                 j++;
yading@10:             } else {
yading@10:                 rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
yading@10:                                     ((alpha[i] * 17) << 24);
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
yading@10: 
yading@10: static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
yading@10:                                 const uint8_t *buf, int buf_size)
yading@10: {
yading@10:     int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos;
yading@10:     int big_offsets, offset_size, is_8bit = 0;
yading@10:     const uint8_t *yuv_palette = 0;
yading@10:     uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
yading@10:     int date;
yading@10:     int i;
yading@10:     int is_menu = 0;
yading@10: 
yading@10:     if (buf_size < 10)
yading@10:         return -1;
yading@10: 
yading@10:     if (AV_RB16(buf) == 0) {   /* HD subpicture with 4-byte offsets */
yading@10:         big_offsets = 1;
yading@10:         offset_size = 4;
yading@10:         cmd_pos = 6;
yading@10:     } else {
yading@10:         big_offsets = 0;
yading@10:         offset_size = 2;
yading@10:         cmd_pos = 2;
yading@10:     }
yading@10: 
yading@10:     cmd_pos = READ_OFFSET(buf + cmd_pos);
yading@10: 
yading@10:     while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {
yading@10:         date = AV_RB16(buf + cmd_pos);
yading@10:         next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);
yading@10:         av_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",
yading@10:                 cmd_pos, next_cmd_pos, date);
yading@10:         pos = cmd_pos + 2 + offset_size;
yading@10:         offset1 = -1;
yading@10:         offset2 = -1;
yading@10:         x1 = y1 = x2 = y2 = 0;
yading@10:         while (pos < buf_size) {
yading@10:             cmd = buf[pos++];
yading@10:             av_dlog(NULL, "cmd=%02x\n", cmd);
yading@10:             switch(cmd) {
yading@10:             case 0x00:
yading@10:                 /* menu subpicture */
yading@10:                 is_menu = 1;
yading@10:                 break;
yading@10:             case 0x01:
yading@10:                 /* set start date */
yading@10:                 sub_header->start_display_time = (date << 10) / 90;
yading@10:                 break;
yading@10:             case 0x02:
yading@10:                 /* set end date */
yading@10:                 sub_header->end_display_time = (date << 10) / 90;
yading@10:                 break;
yading@10:             case 0x03:
yading@10:                 /* set colormap */
yading@10:                 if ((buf_size - pos) < 2)
yading@10:                     goto fail;
yading@10:                 colormap[3] = buf[pos] >> 4;
yading@10:                 colormap[2] = buf[pos] & 0x0f;
yading@10:                 colormap[1] = buf[pos + 1] >> 4;
yading@10:                 colormap[0] = buf[pos + 1] & 0x0f;
yading@10:                 pos += 2;
yading@10:                 break;
yading@10:             case 0x04:
yading@10:                 /* set alpha */
yading@10:                 if ((buf_size - pos) < 2)
yading@10:                     goto fail;
yading@10:                 alpha[3] = buf[pos] >> 4;
yading@10:                 alpha[2] = buf[pos] & 0x0f;
yading@10:                 alpha[1] = buf[pos + 1] >> 4;
yading@10:                 alpha[0] = buf[pos + 1] & 0x0f;
yading@10:                 pos += 2;
yading@10:             av_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
yading@10:                 break;
yading@10:             case 0x05:
yading@10:             case 0x85:
yading@10:                 if ((buf_size - pos) < 6)
yading@10:                     goto fail;
yading@10:                 x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
yading@10:                 x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
yading@10:                 y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
yading@10:                 y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
yading@10:                 if (cmd & 0x80)
yading@10:                     is_8bit = 1;
yading@10:                 av_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);
yading@10:                 pos += 6;
yading@10:                 break;
yading@10:             case 0x06:
yading@10:                 if ((buf_size - pos) < 4)
yading@10:                     goto fail;
yading@10:                 offset1 = AV_RB16(buf + pos);
yading@10:                 offset2 = AV_RB16(buf + pos + 2);
yading@10:                 av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
yading@10:                 pos += 4;
yading@10:                 break;
yading@10:             case 0x86:
yading@10:                 if ((buf_size - pos) < 8)
yading@10:                     goto fail;
yading@10:                 offset1 = AV_RB32(buf + pos);
yading@10:                 offset2 = AV_RB32(buf + pos + 4);
yading@10:                 av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
yading@10:                 pos += 8;
yading@10:                 break;
yading@10: 
yading@10:             case 0x83:
yading@10:                 /* HD set palette */
yading@10:                 if ((buf_size - pos) < 768)
yading@10:                     goto fail;
yading@10:                 yuv_palette = buf + pos;
yading@10:                 pos += 768;
yading@10:                 break;
yading@10:             case 0x84:
yading@10:                 /* HD set contrast (alpha) */
yading@10:                 if ((buf_size - pos) < 256)
yading@10:                     goto fail;
yading@10:                 for (i = 0; i < 256; i++)
yading@10:                     alpha[i] = 0xFF - buf[pos+i];
yading@10:                 pos += 256;
yading@10:                 break;
yading@10: 
yading@10:             case 0xff:
yading@10:                 goto the_end;
yading@10:             default:
yading@10:                 av_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);
yading@10:                 goto the_end;
yading@10:             }
yading@10:         }
yading@10:     the_end:
yading@10:         if (offset1 >= 0) {
yading@10:             int w, h;
yading@10:             uint8_t *bitmap;
yading@10: 
yading@10:             /* decode the bitmap */
yading@10:             w = x2 - x1 + 1;
yading@10:             if (w < 0)
yading@10:                 w = 0;
yading@10:             h = y2 - y1;
yading@10:             if (h < 0)
yading@10:                 h = 0;
yading@10:             if (w > 0 && h > 0) {
yading@10:                 if (sub_header->rects != NULL) {
yading@10:                     for (i = 0; i < sub_header->num_rects; i++) {
yading@10:                         av_freep(&sub_header->rects[i]->pict.data[0]);
yading@10:                         av_freep(&sub_header->rects[i]->pict.data[1]);
yading@10:                         av_freep(&sub_header->rects[i]);
yading@10:                     }
yading@10:                     av_freep(&sub_header->rects);
yading@10:                     sub_header->num_rects = 0;
yading@10:                 }
yading@10: 
yading@10:                 bitmap = av_malloc(w * h);
yading@10:                 sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
yading@10:                 sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));
yading@10:                 sub_header->num_rects = 1;
yading@10:                 sub_header->rects[0]->pict.data[0] = bitmap;
yading@10:                 decode_rle(bitmap, w * 2, w, (h + 1) / 2,
yading@10:                            buf, offset1, buf_size, is_8bit);
yading@10:                 decode_rle(bitmap + w, w * 2, w, h / 2,
yading@10:                            buf, offset2, buf_size, is_8bit);
yading@10:                 sub_header->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
yading@10:                 if (is_8bit) {
yading@10:                     if (yuv_palette == 0)
yading@10:                         goto fail;
yading@10:                     sub_header->rects[0]->nb_colors = 256;
yading@10:                     yuv_a_to_rgba(yuv_palette, alpha, (uint32_t*)sub_header->rects[0]->pict.data[1], 256);
yading@10:                 } else {
yading@10:                     sub_header->rects[0]->nb_colors = 4;
yading@10:                     guess_palette(ctx, (uint32_t*)sub_header->rects[0]->pict.data[1],
yading@10:                                   0xffff00);
yading@10:                 }
yading@10:                 sub_header->rects[0]->x = x1;
yading@10:                 sub_header->rects[0]->y = y1;
yading@10:                 sub_header->rects[0]->w = w;
yading@10:                 sub_header->rects[0]->h = h;
yading@10:                 sub_header->rects[0]->type = SUBTITLE_BITMAP;
yading@10:                 sub_header->rects[0]->pict.linesize[0] = w;
yading@10:                 sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
yading@10:             }
yading@10:         }
yading@10:         if (next_cmd_pos < cmd_pos) {
yading@10:             av_log(NULL, AV_LOG_ERROR, "Invalid command offset\n");
yading@10:             break;
yading@10:         }
yading@10:         if (next_cmd_pos == cmd_pos)
yading@10:             break;
yading@10:         cmd_pos = next_cmd_pos;
yading@10:     }
yading@10:     if (sub_header->num_rects > 0)
yading@10:         return is_menu;
yading@10:  fail:
yading@10:     if (sub_header->rects != NULL) {
yading@10:         for (i = 0; i < sub_header->num_rects; i++) {
yading@10:             av_freep(&sub_header->rects[i]->pict.data[0]);
yading@10:             av_freep(&sub_header->rects[i]->pict.data[1]);
yading@10:             av_freep(&sub_header->rects[i]);
yading@10:         }
yading@10:         av_freep(&sub_header->rects);
yading@10:         sub_header->num_rects = 0;
yading@10:     }
yading@10:     return -1;
yading@10: }
yading@10: 
yading@10: static int is_transp(const uint8_t *buf, int pitch, int n,
yading@10:                      const uint8_t *transp_color)
yading@10: {
yading@10:     int i;
yading@10:     for(i = 0; i < n; i++) {
yading@10:         if (!transp_color[*buf])
yading@10:             return 0;
yading@10:         buf += pitch;
yading@10:     }
yading@10:     return 1;
yading@10: }
yading@10: 
yading@10: /* return 0 if empty rectangle, 1 if non empty */
yading@10: static int find_smallest_bounding_rectangle(AVSubtitle *s)
yading@10: {
yading@10:     uint8_t transp_color[256] = { 0 };
yading@10:     int y1, y2, x1, x2, y, w, h, i;
yading@10:     uint8_t *bitmap;
yading@10: 
yading@10:     if (s->num_rects == 0 || s->rects == NULL || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
yading@10:         return 0;
yading@10: 
yading@10:     for(i = 0; i < s->rects[0]->nb_colors; i++) {
yading@10:         if ((((uint32_t*)s->rects[0]->pict.data[1])[i] >> 24) == 0)
yading@10:             transp_color[i] = 1;
yading@10:     }
yading@10:     y1 = 0;
yading@10:     while (y1 < s->rects[0]->h && is_transp(s->rects[0]->pict.data[0] + y1 * s->rects[0]->pict.linesize[0],
yading@10:                                   1, s->rects[0]->w, transp_color))
yading@10:         y1++;
yading@10:     if (y1 == s->rects[0]->h) {
yading@10:         av_freep(&s->rects[0]->pict.data[0]);
yading@10:         s->rects[0]->w = s->rects[0]->h = 0;
yading@10:         return 0;
yading@10:     }
yading@10: 
yading@10:     y2 = s->rects[0]->h - 1;
yading@10:     while (y2 > 0 && is_transp(s->rects[0]->pict.data[0] + y2 * s->rects[0]->pict.linesize[0], 1,
yading@10:                                s->rects[0]->w, transp_color))
yading@10:         y2--;
yading@10:     x1 = 0;
yading@10:     while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->pict.data[0] + x1, s->rects[0]->pict.linesize[0],
yading@10:                                         s->rects[0]->h, transp_color))
yading@10:         x1++;
yading@10:     x2 = s->rects[0]->w - 1;
yading@10:     while (x2 > 0 && is_transp(s->rects[0]->pict.data[0] + x2, s->rects[0]->pict.linesize[0], s->rects[0]->h,
yading@10:                                   transp_color))
yading@10:         x2--;
yading@10:     w = x2 - x1 + 1;
yading@10:     h = y2 - y1 + 1;
yading@10:     bitmap = av_malloc(w * h);
yading@10:     if (!bitmap)
yading@10:         return 1;
yading@10:     for(y = 0; y < h; y++) {
yading@10:         memcpy(bitmap + w * y, s->rects[0]->pict.data[0] + x1 + (y1 + y) * s->rects[0]->pict.linesize[0], w);
yading@10:     }
yading@10:     av_freep(&s->rects[0]->pict.data[0]);
yading@10:     s->rects[0]->pict.data[0] = bitmap;
yading@10:     s->rects[0]->pict.linesize[0] = w;
yading@10:     s->rects[0]->w = w;
yading@10:     s->rects[0]->h = h;
yading@10:     s->rects[0]->x += x1;
yading@10:     s->rects[0]->y += y1;
yading@10:     return 1;
yading@10: }
yading@10: 
yading@10: #ifdef DEBUG
yading@10: #undef fprintf
yading@10: #undef perror
yading@10: #undef exit
yading@10: static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
yading@10:                      uint32_t *rgba_palette)
yading@10: {
yading@10:     int x, y, v;
yading@10:     FILE *f;
yading@10: 
yading@10:     f = fopen(filename, "w");
yading@10:     if (!f) {
yading@10:         perror(filename);
yading@10:         exit(1);
yading@10:     }
yading@10:     fprintf(f, "P6\n"
yading@10:             "%d %d\n"
yading@10:             "%d\n",
yading@10:             w, h, 255);
yading@10:     for(y = 0; y < h; y++) {
yading@10:         for(x = 0; x < w; x++) {
yading@10:             v = rgba_palette[bitmap[y * w + x]];
yading@10:             putc((v >> 16) & 0xff, f);
yading@10:             putc((v >> 8) & 0xff, f);
yading@10:             putc((v >> 0) & 0xff, f);
yading@10:         }
yading@10:     }
yading@10:     fclose(f);
yading@10: }
yading@10: #endif
yading@10: 
yading@10: static int dvdsub_decode(AVCodecContext *avctx,
yading@10:                          void *data, int *data_size,
yading@10:                          AVPacket *avpkt)
yading@10: {
yading@10:     DVDSubContext *ctx = avctx->priv_data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     AVSubtitle *sub = data;
yading@10:     int is_menu;
yading@10: 
yading@10:     is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
yading@10: 
yading@10:     if (is_menu < 0) {
yading@10:     no_subtitle:
yading@10:         *data_size = 0;
yading@10: 
yading@10:         return buf_size;
yading@10:     }
yading@10:     if (!is_menu && find_smallest_bounding_rectangle(sub) == 0)
yading@10:         goto no_subtitle;
yading@10: 
yading@10: #if defined(DEBUG)
yading@10:     av_dlog(NULL, "start=%d ms end =%d ms\n",
yading@10:             sub->start_display_time,
yading@10:             sub->end_display_time);
yading@10:     ppm_save("/tmp/a.ppm", sub->rects[0]->pict.data[0],
yading@10:              sub->rects[0]->w, sub->rects[0]->h, sub->rects[0]->pict.data[1]);
yading@10: #endif
yading@10: 
yading@10:     *data_size = 1;
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static void parse_palette(DVDSubContext *ctx, char *p)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     ctx->has_palette = 1;
yading@10:     for(i=0;i<16;i++) {
yading@10:         ctx->palette[i] = strtoul(p, &p, 16);
yading@10:         while(*p == ',' || av_isspace(*p))
yading@10:             p++;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int dvdsub_parse_extradata(AVCodecContext *avctx)
yading@10: {
yading@10:     DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
yading@10:     char *dataorig, *data;
yading@10: 
yading@10:     if (!avctx->extradata || !avctx->extradata_size)
yading@10:         return 1;
yading@10: 
yading@10:     dataorig = data = av_malloc(avctx->extradata_size+1);
yading@10:     if (!data)
yading@10:         return AVERROR(ENOMEM);
yading@10:     memcpy(data, avctx->extradata, avctx->extradata_size);
yading@10:     data[avctx->extradata_size] = '\0';
yading@10: 
yading@10:     for(;;) {
yading@10:         int pos = strcspn(data, "\n\r");
yading@10:         if (pos==0 && *data==0)
yading@10:             break;
yading@10: 
yading@10:         if (strncmp("palette:", data, 8) == 0) {
yading@10:             parse_palette(ctx, data + 8);
yading@10:         } else if (strncmp("size:", data, 5) == 0) {
yading@10:             int w, h;
yading@10:             if (sscanf(data + 5, "%dx%d", &w, &h) == 2 &&
yading@10:                 av_image_check_size(w, h, 0, avctx) >= 0)
yading@10:                 avcodec_set_dimensions(avctx, w, h);
yading@10:         }
yading@10: 
yading@10:         data += pos;
yading@10:         data += strspn(data, "\n\r");
yading@10:     }
yading@10: 
yading@10:     av_free(dataorig);
yading@10:     return 1;
yading@10: }
yading@10: 
yading@10: static int dvdsub_init(AVCodecContext *avctx)
yading@10: {
yading@10:     DVDSubContext *ctx = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = dvdsub_parse_extradata(avctx)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (ctx->palette_str)
yading@10:         parse_palette(ctx, ctx->palette_str);
yading@10:     if (ctx->has_palette) {
yading@10:         int i;
yading@10:         av_log(avctx, AV_LOG_DEBUG, "palette:");
yading@10:         for(i=0;i<16;i++)
yading@10:             av_log(avctx, AV_LOG_DEBUG, " 0x%06x", ctx->palette[i]);
yading@10:         av_log(avctx, AV_LOG_DEBUG, "\n");
yading@10:     }
yading@10: 
yading@10:     return 1;
yading@10: }
yading@10: 
yading@10: #define OFFSET(field) offsetof(DVDSubContext, field)
yading@10: #define VD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
yading@10: static const AVOption options[] = {
yading@10:     { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, VD },
yading@10:     { NULL }
yading@10: };
yading@10: static const AVClass class = {
yading@10:     .class_name = "dvdsubdec",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVCodec ff_dvdsub_decoder = {
yading@10:     .name           = "dvdsub",
yading@10:     .type           = AVMEDIA_TYPE_SUBTITLE,
yading@10:     .id             = AV_CODEC_ID_DVD_SUBTITLE,
yading@10:     .priv_data_size = sizeof(DVDSubContext),
yading@10:     .init           = dvdsub_init,
yading@10:     .decode         = dvdsub_decode,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("DVD subtitles"),
yading@10:     .priv_class     = &class,
yading@10: };