/*
- * DVD subtitle decoding for ffmpeg
+ * DVD subtitle decoding
* Copyright (c) 2005 Fabrice Bellard
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
-#include "bitstream.h"
-#include "colorspace.h"
+#include "get_bits.h"
#include "dsputil.h"
+#include "libavutil/attributes.h"
+#include "libavutil/colorspace.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/avstring.h"
-//#define DEBUG
+typedef struct DVDSubContext {
+ uint32_t palette[16];
+ int has_palette;
+} DVDSubContext;
static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
{
- uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
+ const uint8_t *cm = ff_cropTbl + 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++;
- cb = *ycbcr++;
cr = *ycbcr++;
+ cb = *ycbcr++;
YUV_TO_RGB1_CCIR(cb, cr);
YUV_TO_RGB2_CCIR(r, g, b, y);
*rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;
return 0;
}
-static void guess_palette(uint32_t *rgba_palette,
+static void guess_palette(DVDSubContext* ctx,
+ uint32_t *rgba_palette,
uint8_t *colormap,
uint8_t *alpha,
uint32_t subtitle_color)
{
- uint8_t color_used[16];
+ uint8_t color_used[16] = { 0 };
int nb_opaque_colors, i, level, j, r, g, b;
+ if (ctx->has_palette) {
+ for (i = 0; i < 4; i++)
+ rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
+ | ((alpha[i] * 17) << 24);
+ return;
+ }
+
for(i = 0; i < 4; i++)
rgba_palette[i] = 0;
- memset(color_used, 0, 16);
nb_opaque_colors = 0;
for(i = 0; i < 4; i++) {
if (alpha[i] != 0 && !color_used[colormap[i]]) {
#define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
-static int decode_dvd_subtitles(AVSubtitle *sub_header,
+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, offset1, offset2, next_cmd_pos;
int big_offsets, offset_size, is_8bit = 0;
const uint8_t *yuv_palette = 0;
- uint8_t colormap[4], alpha[256];
+ uint8_t colormap[4] = { 0 }, alpha[256] = { 0 };
int date;
int i;
int is_menu = 0;
if (buf_size < 10)
return -1;
- sub_header->rects = NULL;
- sub_header->num_rects = 0;
- sub_header->format = 0;
- sub_header->start_display_time = 0;
- sub_header->end_display_time = 0;
+ memset(sub_header, 0, sizeof(*sub_header));
if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
big_offsets = 1;
cmd_pos = READ_OFFSET(buf + cmd_pos);
- while ((cmd_pos + 2 + offset_size) < buf_size) {
+ 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);
-#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
+ av_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++];
-#ifdef DEBUG
- av_log(NULL, AV_LOG_INFO, "cmd=%02x\n", cmd);
-#endif
+ av_dlog(NULL, "cmd=%02x\n", cmd);
switch(cmd) {
case 0x00:
/* menu subpicture */
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
+ av_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
break;
case 0x05:
case 0x85:
y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
if (cmd & 0x80)
is_8bit = 1;
-#ifdef DEBUG
- av_log(NULL, AV_LOG_INFO, "x1=%d x2=%d y1=%d y2=%d\n",
- x1, x2, y1, y2);
-#endif
+ av_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);
pos += 6;
break;
case 0x06:
goto fail;
offset1 = AV_RB16(buf + pos);
offset2 = AV_RB16(buf + pos + 2);
-#ifdef DEBUG
- av_log(NULL, AV_LOG_INFO, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
-#endif
+ av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
pos += 4;
break;
case 0x86:
goto fail;
offset1 = AV_RB32(buf + pos);
offset2 = AV_RB32(buf + pos + 4);
-#ifdef DEBUG
- av_log(NULL, AV_LOG_INFO, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
-#endif
+ av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
pos += 8;
break;
case 0xff:
goto the_end;
default:
-#ifdef DEBUG
- av_log(NULL, AV_LOG_INFO, "unrecognised subpicture command 0x%x\n", cmd);
-#endif
+ av_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);
goto the_end;
}
}
buf, offset1, buf_size, is_8bit);
decode_rle(bitmap + w, w * 2, w, h / 2,
buf, offset2, buf_size, is_8bit);
+ sub_header->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
if (is_8bit) {
if (yuv_palette == 0)
goto fail;
- sub_header->rects[0]->pict.data[1] = av_malloc(256 * 4);
sub_header->rects[0]->nb_colors = 256;
yuv_a_to_rgba(yuv_palette, alpha, (uint32_t*)sub_header->rects[0]->pict.data[1], 256);
} else {
- sub_header->rects[0]->pict.data[1] = av_malloc(4 * 4);
sub_header->rects[0]->nb_colors = 4;
- guess_palette((uint32_t*)sub_header->rects[0]->pict.data[1],
+ guess_palette(ctx,
+ (uint32_t*)sub_header->rects[0]->pict.data[1],
colormap, 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]->type = SUBTITLE_BITMAP;
sub_header->rects[0]->pict.linesize[0] = w;
}
}
/* return 0 if empty rectangle, 1 if non empty */
static int find_smallest_bounding_rectangle(AVSubtitle *s)
{
- uint8_t transp_color[256];
+ uint8_t transp_color[256] = { 0 };
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 ((((uint32_t*)s->rects[0]->pict.data[1])[i] >> 24) == 0)
transp_color[i] = 1;
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 = (void *)data;
+ AVSubtitle *sub = data;
int is_menu;
- is_menu = decode_dvd_subtitles(sub, buf, buf_size);
+ is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
if (is_menu < 0) {
no_subtitle:
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);
+ av_dlog(NULL, "start=%d ms end =%d ms\n",
+ sub->start_display_time,
+ sub->end_display_time);
ppm_save("/tmp/a.ppm", sub->rects[0]->pict.data[0],
sub->rects[0]->w, sub->rects[0]->h, sub->rects[0]->pict.data[1]);
#endif
return buf_size;
}
-AVCodec dvdsub_decoder = {
- "dvdsub",
- CODEC_TYPE_SUBTITLE,
- CODEC_ID_DVD_SUBTITLE,
- 0,
- NULL,
- NULL,
- NULL,
- dvdsub_decode,
- .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
+static av_cold int dvdsub_init(AVCodecContext *avctx)
+{
+ DVDSubContext *ctx = avctx->priv_data;
+ char *data, *cur;
+
+ if (!avctx->extradata || !avctx->extradata_size)
+ return 0;
+
+ data = av_malloc(avctx->extradata_size + 1);
+ if (!data)
+ return AVERROR(ENOMEM);
+ memcpy(data, avctx->extradata, avctx->extradata_size);
+ data[avctx->extradata_size] = '\0';
+ cur = data;
+
+ while (*cur) {
+ if (strncmp("palette:", cur, 8) == 0) {
+ int i;
+ char *p = cur + 8;
+ ctx->has_palette = 1;
+ for (i = 0; i < 16; i++) {
+ ctx->palette[i] = strtoul(p, &p, 16);
+ while (*p == ',' || av_isspace(*p))
+ p++;
+ }
+ } else if (!strncmp("size:", cur, 5)) {
+ int w, h;
+ if (sscanf(cur + 5, "%dx%d", &w, &h) == 2 &&
+ av_image_check_size(w, h, 0, avctx) >= 0)
+ avcodec_set_dimensions(avctx, w, h);
+ }
+ cur += strcspn(cur, "\n\r");
+ cur += strspn(cur, "\n\r");
+ }
+ av_free(data);
+ return 0;
+}
+
+AVCodec ff_dvdsub_decoder = {
+ .name = "dvdsub",
+ .type = AVMEDIA_TYPE_SUBTITLE,
+ .id = AV_CODEC_ID_DVD_SUBTITLE,
+ .priv_data_size = sizeof(DVDSubContext),
+ .init = dvdsub_init,
+ .decode = dvdsub_decode,
+ .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
};