/*
- * DVD subtitle decoding for ffmpeg
- * Copyright (c) 2005 Fabrice Bellard.
+ * DVD subtitle decoding/encoding
+ * Copyright (c) 2005 Fabrice Bellard
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 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"
-
-//#define DEBUG
-
-typedef struct DVDSubContext {
-} DVDSubContext;
-
-static int dvdsub_init_decoder(AVCodecContext *avctx)
-{
- return 0;
-}
-
-uint16_t getbe16(const uint8_t *p)
-{
- return (p[0] << 8) | p[1];
-}
-
-int get_nibble(const uint8_t *buf, int nibble_offset)
-{
- return (buf[nibble_offset >> 1] >> ((1 - (nibble_offset & 1)) << 2)) & 0xf;
-}
-
-static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
- const uint8_t *buf, int nibble_offset, int buf_size)
-{
- unsigned int v;
- int x, y, len, color, nibble_end;
- uint8_t *d;
-
- nibble_end = buf_size * 2;
- x = 0;
- y = 0;
- d = bitmap;
- for(;;) {
- if (nibble_offset >= nibble_end)
- return -1;
- v = get_nibble(buf, nibble_offset++);
- if (v < 0x4) {
- v = (v << 4) | get_nibble(buf, nibble_offset++);
- if (v < 0x10) {
- v = (v << 4) | get_nibble(buf, nibble_offset++);
- if (v < 0x040) {
- v = (v << 4) | get_nibble(buf, nibble_offset++);
- if (v < 4) {
- v |= (w - x) << 2;
- }
- }
- }
- }
- len = v >> 2;
- if (len > (w - x))
- len = (w - x);
- color = v & 0x03;
- memset(d + x, color, len);
- x += len;
- if (x >= w) {
- y++;
- if (y >= h)
- break;
- d += linesize;
- x = 0;
- /* byte align */
- nibble_offset += (nibble_offset & 1);
- }
- }
- return 0;
-}
-
-static void guess_palette(uint32_t *rgba_palette,
- uint8_t *palette,
- uint8_t *alpha,
- uint32_t subtitle_color)
-{
- uint8_t color_used[16];
- int nb_opaque_colors, i, level, j, r, g, b;
- for(i = 0; i < 4; i++)
- rgba_palette[i] = 0;
+#include "internal.h"
+#include "libavutil/avstring.h"
+#include <stdlib.h>
- memset(color_used, 0, 16);
- nb_opaque_colors = 0;
- for(i = 0; i < 4; i++) {
- if (alpha[i] != 0 && !color_used[palette[i]]) {
- color_used[palette[i]] = 1;
- nb_opaque_colors++;
- }
- }
-
- if (nb_opaque_colors == 0)
- return;
-
- j = nb_opaque_colors;
- memset(color_used, 0, 16);
- for(i = 0; i < 4; i++) {
- if (alpha[i] != 0) {
- if (!color_used[palette[i]]) {
- level = (0xff * j) / nb_opaque_colors;
- 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] * 17) << 24);
- color_used[palette[i]] = (i + 1);
- j--;
- } else {
- rgba_palette[i] = (rgba_palette[color_used[palette[i]] - 1] & 0x00ffffff) |
- ((alpha[i] * 17) << 24);
- }
- }
- }
-}
-
-static int decode_dvd_subtitles(AVSubtitle *sub_header,
- const uint8_t *buf, int buf_size)
+void ff_dvdsub_parse_palette(uint32_t *palette, const char *p)
{
- int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos;
- uint8_t palette[4], alpha[4];
- int date;
- int i;
- int is_menu = 0;
-
- if (buf_size < 4)
- return -1;
- sub_header->rects = NULL;
- sub_header->num_rects = 0;
- sub_header->start_display_time = 0;
- sub_header->end_display_time = 0;
-
- cmd_pos = getbe16(buf + 2);
- while ((cmd_pos + 4) < buf_size) {
- date = getbe16(buf + cmd_pos);
- next_cmd_pos = getbe16(buf + cmd_pos + 2);
-#ifdef DEBUG
- av_log(NULL, AV_LOG_INFO, "cmd_pos=0x%04x next=0x%04x date=%d\n",
- cmd_pos, next_cmd_pos, date);
-#endif
- pos = cmd_pos + 4;
- offset1 = -1;
- offset2 = -1;
- x1 = y1 = x2 = y2 = 0;
- while (pos < buf_size) {
- cmd = buf[pos++];
-#ifdef DEBUG
- av_log(NULL, AV_LOG_INFO, "cmd=%02x\n", cmd);
-#endif
- 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 palette */
- if ((buf_size - pos) < 2)
- goto fail;
- palette[3] = buf[pos] >> 4;
- palette[2] = buf[pos] & 0x0f;
- palette[1] = buf[pos + 1] >> 4;
- palette[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;
-#ifdef DEBUG
- av_log(NULL, AV_LOG_INFO, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
-#endif
- break;
- case 0x05:
- 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];
-#ifdef DEBUG
- av_log(NULL, AV_LOG_INFO, "x1=%d x2=%d y1=%d y2=%d\n",
- x1, x2, y1, y2);
-#endif
- pos += 6;
- break;
- case 0x06:
- if ((buf_size - pos) < 4)
- goto fail;
- offset1 = getbe16(buf + pos);
- offset2 = getbe16(buf + pos + 2);
-#ifdef DEBUG
- av_log(NULL, AV_LOG_INFO, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
-#endif
- pos += 4;
- break;
- case 0xff:
- default:
- goto the_end;
- }
- }
- the_end:
- if (offset1 >= 0) {
- int w, h;
- uint8_t *bitmap;
-
- /* decode the bitmap */
- w = x2 - x1 + 1;
- if (w < 0)
- w = 0;
- h = y2 - y1;
- if (h < 0)
- h = 0;
- if (w > 0 && h > 0) {
- if (sub_header->rects != NULL) {
- for (i = 0; i < sub_header->num_rects; i++) {
- av_free(sub_header->rects[i].bitmap);
- av_free(sub_header->rects[i].rgba_palette);
- }
- av_freep(&sub_header->rects);
- sub_header->num_rects = 0;
- }
-
- bitmap = av_malloc(w * h);
- sub_header->rects = av_mallocz(sizeof(AVSubtitleRect));
- sub_header->num_rects = 1;
- sub_header->rects[0].rgba_palette = av_malloc(4 * 4);
- decode_rle(bitmap, w * 2, w, h / 2,
- buf, offset1 * 2, buf_size);
- decode_rle(bitmap + w, w * 2, w, h / 2,
- buf, offset2 * 2, buf_size);
- guess_palette(sub_header->rects[0].rgba_palette,
- palette, alpha, 0xffff00);
- 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].nb_colors = 4;
- sub_header->rects[0].linesize = w;
- sub_header->rects[0].bitmap = bitmap;
- }
- }
- if (next_cmd_pos == cmd_pos)
- break;
- cmd_pos = next_cmd_pos;
+ for (int i = 0; i < 16; i++) {
+ palette[i] = strtoul(p, (char **)&p, 16);
+ while (*p == ',' || av_isspace(*p))
+ p++;
}
- if (sub_header->num_rects > 0)
- return is_menu;
- fail:
- 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(AVSubtitle *s)
-{
- uint8_t transp_color[256];
- int y1, y2, x1, x2, y, w, h, i;
- uint8_t *bitmap;
-
- if (s->num_rects == 0 || s->rects == NULL || s->rects[0].w <= 0 || s->rects[0].h <= 0)
- return 0;
-
- memset(transp_color, 0, 256);
- for(i = 0; i < s->rects[0].nb_colors; i++) {
- if ((s->rects[0].rgba_palette[i] >> 24) == 0)
- transp_color[i] = 1;
- }
- y1 = 0;
- while (y1 < s->rects[0].h && is_transp(s->rects[0].bitmap + y1 * s->rects[0].linesize,
- 1, s->rects[0].w, transp_color))
- y1++;
- if (y1 == s->rects[0].h) {
- av_freep(&s->rects[0].bitmap);
- 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].bitmap + y2 * s->rects[0].linesize, 1,
- s->rects[0].w, transp_color))
- y2--;
- x1 = 0;
- while (x1 < (s->rects[0].w - 1) && is_transp(s->rects[0].bitmap + x1, s->rects[0].linesize,
- s->rects[0].h, transp_color))
- x1++;
- x2 = s->rects[0].w - 1;
- while (x2 > 0 && is_transp(s->rects[0].bitmap + x2, s->rects[0].linesize, 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].bitmap + x1 + (y1 + y) * s->rects[0].linesize, w);
- }
- av_freep(&s->rects[0].bitmap);
- s->rects[0].bitmap = bitmap;
- s->rects[0].linesize = 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 dvdsub_close_decoder(AVCodecContext *avctx)
-{
- return 0;
-}
-
-#ifdef DEBUG
-#undef fprintf
-static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
- uint32_t *rgba_palette)
-{
- int x, y, v;
- FILE *f;
-
- f = fopen(filename, "w");
- if (!f) {
- perror(filename);
- exit(1);
- }
- 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]];
- putc((v >> 16) & 0xff, f);
- putc((v >> 8) & 0xff, f);
- putc((v >> 0) & 0xff, f);
- }
- }
- fclose(f);
-}
-#endif
-
-static int dvdsub_decode(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
-{
- AVSubtitle *sub = (void *)data;
- int is_menu;
-
- is_menu = decode_dvd_subtitles(sub, buf, buf_size);
-
- if (is_menu < 0) {
- no_subtitle:
- *data_size = 0;
-
- return buf_size;
- }
- if (!is_menu && find_smallest_bounding_rectangle(sub) == 0)
- goto no_subtitle;
-
-#if defined(DEBUG)
- av_log(NULL, AV_LOG_INFO, "start=%d ms end =%d ms\n",
- sub->start_display_time,
- sub->end_display_time);
- ppm_save("/tmp/a.ppm", sub->rects[0].bitmap,
- sub->rects[0].w, sub->rects[0].h, sub->rects[0].rgba_palette);
-#endif
-
- *data_size = 1;
- return buf_size;
-}
-
-AVCodec dvdsub_decoder = {
- "dvdsub",
- CODEC_TYPE_SUBTITLE,
- CODEC_ID_DVD_SUBTITLE,
- sizeof(DVDSubContext),
- dvdsub_init_decoder,
- NULL,
- dvdsub_close_decoder,
- dvdsub_decode,
-};
-
-/* parser definition */
-typedef struct DVDSubParseContext {
- uint8_t *packet;
- int packet_len;
- int packet_index;
-} DVDSubParseContext;
-
-static int dvdsub_parse_init(AVCodecParserContext *s)
-{
- return 0;
-}
-
-static int dvdsub_parse(AVCodecParserContext *s,
- AVCodecContext *avctx,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size)
-{
- DVDSubParseContext *pc = s->priv_data;
-
- if (pc->packet_index == 0) {
- if (buf_size < 2)
- return 0;
- pc->packet_len = (buf[0] << 8) | buf[1];
- av_freep(&pc->packet);
- pc->packet = av_malloc(pc->packet_len);
- }
- if (pc->packet) {
- if (pc->packet_index + buf_size <= pc->packet_len) {
- memcpy(pc->packet + pc->packet_index, buf, buf_size);
- pc->packet_index += buf_size;
- if (pc->packet_index >= pc->packet_len) {
- *poutbuf = pc->packet;
- *poutbuf_size = pc->packet_len;
- pc->packet_index = 0;
- return buf_size;
- }
- } else {
- /* erroneous size */
- pc->packet_index = 0;
- }
- }
- *poutbuf = NULL;
- *poutbuf_size = 0;
- return buf_size;
-}
-
-static void dvdsub_parse_close(AVCodecParserContext *s)
-{
- DVDSubParseContext *pc = s->priv_data;
- av_freep(&pc->packet);
-}
-
-AVCodecParser dvdsub_parser = {
- { CODEC_ID_DVD_SUBTITLE },
- sizeof(DVDSubParseContext),
- dvdsub_parse_init,
- dvdsub_parse,
- dvdsub_parse_close,
-};
projects / ffmpeg / blobdiff