* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
+#include "bitstream.h"
+#include "colorspace.h"
+#include "dsputil.h"
//#define DEBUG
-static int dvdsub_init_decoder(AVCodecContext *avctx)
+static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
{
- return 0;
+ 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++;
+ YUV_TO_RGB1_CCIR(cb, cr);
+ YUV_TO_RGB2_CCIR(r, g, b, y);
+ *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;
+ }
}
-static uint16_t getbe16(const uint8_t *p)
+static int decode_run_2bit(GetBitContext *gb, int *color)
{
- return (p[0] << 8) | p[1];
+ 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 get_nibble(const uint8_t *buf, int nibble_offset)
+static int decode_run_8bit(GetBitContext *gb, int *color)
{
- return (buf[nibble_offset >> 1] >> ((1 - (nibble_offset & 1)) << 2)) & 0xf;
+ int len;
+ int has_run = get_bits1(gb);
+ if (get_bits1(gb))
+ *color = get_bits(gb, 8);
+ else
+ *color = get_bits(gb, 2);
+ 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,
- const uint8_t *buf, int nibble_offset, int buf_size)
+ const uint8_t *buf, int start, int buf_size, int is_8bit)
{
- unsigned int v;
- int x, y, len, color, nibble_end;
+ GetBitContext gb;
+ int bit_len;
+ int x, y, len, color;
uint8_t *d;
- nibble_end = buf_size * 2;
+ bit_len = (buf_size - start) * 8;
+ init_get_bits(&gb, buf + start, bit_len);
+
x = 0;
y = 0;
d = bitmap;
for(;;) {
- if (nibble_offset >= nibble_end)
+ if (get_bits_count(&gb) > bit_len)
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;
+ if (is_8bit)
+ len = decode_run_8bit(&gb, &color);
+ else
+ len = decode_run_2bit(&gb, &color);
+ len = FFMIN(len, w - x);
memset(d + x, color, len);
x += len;
if (x >= w) {
d += linesize;
x = 0;
/* byte align */
- nibble_offset += (nibble_offset & 1);
+ align_get_bits(&gb);
}
}
return 0;
}
static void guess_palette(uint32_t *rgba_palette,
- uint8_t *palette,
+ uint8_t *colormap,
uint8_t *alpha,
uint32_t subtitle_color)
{
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;
+ if (alpha[i] != 0 && !color_used[colormap[i]]) {
+ color_used[colormap[i]] = 1;
nb_opaque_colors++;
}
}
memset(color_used, 0, 16);
for(i = 0; i < 4; i++) {
if (alpha[i] != 0) {
- if (!color_used[palette[i]]) {
+ if (!color_used[colormap[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);
+ color_used[colormap[i]] = (i + 1);
j--;
} else {
- rgba_palette[i] = (rgba_palette[color_used[palette[i]] - 1] & 0x00ffffff) |
+ rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
((alpha[i] * 17) << 24);
}
}
}
}
+#define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
+
static int decode_dvd_subtitles(AVSubtitle *sub_header,
const uint8_t *buf, int buf_size)
{
int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos;
- uint8_t palette[4], alpha[4];
+ int big_offsets, offset_size, is_8bit = 0;
+ const uint8_t *yuv_palette = 0;
+ uint8_t colormap[4], alpha[256];
int date;
int i;
int is_menu = 0;
- if (buf_size < 4)
+ if (buf_size < 10)
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);
+ 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;
+ }
+
+ cmd_pos = READ_OFFSET(buf + cmd_pos);
+
+ while ((cmd_pos + 2 + offset_size) < buf_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
- pos = cmd_pos + 4;
+ pos = cmd_pos + 2 + offset_size;
offset1 = -1;
offset2 = -1;
x1 = y1 = x2 = y2 = 0;
sub_header->end_display_time = (date << 10) / 90;
break;
case 0x03:
- /* set palette */
+ /* set colormap */
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;
+ 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:
#endif
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;
#ifdef DEBUG
av_log(NULL, AV_LOG_INFO, "x1=%d x2=%d y1=%d y2=%d\n",
x1, x2, y1, y2);
case 0x06:
if ((buf_size - pos) < 4)
goto fail;
- offset1 = getbe16(buf + pos);
- offset2 = getbe16(buf + pos + 2);
+ 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
pos += 4;
break;
+ case 0x86:
+ if ((buf_size - pos) < 8)
+ 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
+ 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:
+#ifdef DEBUG
+ av_log(NULL, AV_LOG_INFO, "unrecognised subpicture command 0x%x\n", cmd);
+#endif
goto the_end;
}
}
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);
+ sub_header->rects[0].bitmap = bitmap;
decode_rle(bitmap, w * 2, w, (h + 1) / 2,
- buf, offset1 * 2, buf_size);
+ buf, offset1, buf_size, is_8bit);
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);
+ buf, offset2, buf_size, is_8bit);
+ if (is_8bit) {
+ if (yuv_palette == 0)
+ goto fail;
+ sub_header->rects[0].rgba_palette = av_malloc(256 * 4);
+ sub_header->rects[0].nb_colors = 256;
+ yuv_a_to_rgba(yuv_palette, alpha, sub_header->rects[0].rgba_palette, 256);
+ } else {
+ sub_header->rects[0].rgba_palette = av_malloc(4 * 4);
+ sub_header->rects[0].nb_colors = 4;
+ guess_palette(sub_header->rects[0].rgba_palette,
+ 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].nb_colors = 4;
sub_header->rects[0].linesize = w;
- sub_header->rects[0].bitmap = bitmap;
}
}
if (next_cmd_pos == cmd_pos)
if (sub_header->num_rects > 0)
return is_menu;
fail:
+ 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;
+ }
return -1;
}
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,
static int dvdsub_decode(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ const uint8_t *buf, int buf_size)
{
AVSubtitle *sub = (void *)data;
int is_menu;
CODEC_TYPE_SUBTITLE,
CODEC_ID_DVD_SUBTITLE,
0,
- dvdsub_init_decoder,
NULL,
- dvdsub_close_decoder,
+ NULL,
+ NULL,
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