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-rw-r--r--libavcodec/dvbsubdec.c236
1 files changed, 160 insertions, 76 deletions
diff --git a/libavcodec/dvbsubdec.c b/libavcodec/dvbsubdec.c
index 6ce187f85d..551a1a205c 100644
--- a/libavcodec/dvbsubdec.c
+++ b/libavcodec/dvbsubdec.c
@@ -2,20 +2,20 @@
* DVB subtitle decoding
* Copyright (c) 2005 Ian Caulfield
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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 2.1 of the License, or (at your option) any later version.
*
- * Libav 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 Libav; if not, write to the Free Software
+ * 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"
@@ -152,6 +152,7 @@ static void png_save2(const char *filename, uint32_t *bitmap, int w, int h)
typedef struct DVBSubCLUT {
int id;
+ int version;
uint32_t clut4[4];
uint32_t clut16[16];
@@ -178,6 +179,7 @@ typedef struct DVBSubObjectDisplay {
typedef struct DVBSubObject {
int id;
+ int version;
int type;
@@ -197,6 +199,7 @@ typedef struct DVBSubRegionDisplay {
typedef struct DVBSubRegion {
int id;
+ int version;
int width;
int height;
@@ -207,6 +210,7 @@ typedef struct DVBSubRegion {
uint8_t *pbuf;
int buf_size;
+ int dirty;
DVBSubObjectDisplay *display_list;
@@ -226,12 +230,12 @@ typedef struct DVBSubContext {
int composition_id;
int ancillary_id;
+ int version;
int time_out;
DVBSubRegion *region_list;
DVBSubCLUT *clut_list;
DVBSubObject *object_list;
- int display_list_size;
DVBSubRegionDisplay *display_list;
DVBSubDisplayDefinition *display_definition;
} DVBSubContext;
@@ -316,21 +320,10 @@ static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region)
}
-static void delete_state(DVBSubContext *ctx)
+static void delete_cluts(DVBSubContext *ctx)
{
- DVBSubRegion *region;
DVBSubCLUT *clut;
- while (ctx->region_list) {
- region = ctx->region_list;
-
- ctx->region_list = region->next;
-
- delete_region_display_list(ctx, region);
- av_free(region->pbuf);
- av_free(region);
- }
-
while (ctx->clut_list) {
clut = ctx->clut_list;
@@ -338,12 +331,35 @@ static void delete_state(DVBSubContext *ctx)
av_free(clut);
}
+}
- av_freep(&ctx->display_definition);
+static void delete_objects(DVBSubContext *ctx)
+{
+ DVBSubObject *object;
+
+ while (ctx->object_list) {
+ object = ctx->object_list;
+
+ ctx->object_list = object->next;
- /* Should already be null */
- if (ctx->object_list)
- av_log(0, AV_LOG_ERROR, "Memory deallocation error!\n");
+ av_free(object);
+ }
+}
+
+static void delete_regions(DVBSubContext *ctx)
+{
+ DVBSubRegion *region;
+
+ while (ctx->region_list) {
+ region = ctx->region_list;
+
+ ctx->region_list = region->next;
+
+ delete_region_display_list(ctx, region);
+
+ av_free(region->pbuf);
+ av_free(region);
+ }
}
static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
@@ -351,15 +367,21 @@ static av_cold int dvbsub_init_decoder(AVCodecContext *avctx)
int i, r, g, b, a = 0;
DVBSubContext *ctx = avctx->priv_data;
- if (!avctx->extradata || avctx->extradata_size != 4) {
- av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n");
+ if (!avctx->extradata || (avctx->extradata_size < 4) || ((avctx->extradata_size % 5 != 0) && (avctx->extradata_size != 4))) {
+ av_log(avctx, AV_LOG_WARNING, "Invalid DVB subtitles stream extradata!\n");
ctx->composition_id = -1;
ctx->ancillary_id = -1;
} else {
+ if (avctx->extradata_size > 5) {
+ av_log(avctx, AV_LOG_WARNING, "Decoding first DVB subtitles sub-stream\n");
+ }
+
ctx->composition_id = AV_RB16(avctx->extradata);
ctx->ancillary_id = AV_RB16(avctx->extradata + 2);
}
+ ctx->version = -1;
+
default_clut.id = -1;
default_clut.next = NULL;
@@ -428,7 +450,13 @@ static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
DVBSubContext *ctx = avctx->priv_data;
DVBSubRegionDisplay *display;
- delete_state(ctx);
+ delete_regions(ctx);
+
+ delete_objects(ctx);
+
+ delete_cluts(ctx);
+
+ av_freep(&ctx->display_definition);
while (ctx->display_list) {
display = ctx->display_list;
@@ -442,16 +470,18 @@ static av_cold int dvbsub_close_decoder(AVCodecContext *avctx)
static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
const uint8_t **srcbuf, int buf_size,
- int non_mod, uint8_t *map_table)
+ int non_mod, uint8_t *map_table, int x_pos)
{
GetBitContext gb;
int bits;
int run_length;
- int pixels_read = 0;
+ int pixels_read = x_pos;
init_get_bits(&gb, *srcbuf, buf_size << 3);
+ destbuf += x_pos;
+
while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
bits = get_bits(&gb, 2);
@@ -512,14 +542,14 @@ static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
}
}
} else if (bits == 1) {
- pixels_read += 2;
if (map_table)
bits = map_table[0];
else
bits = 0;
- if (pixels_read <= dbuf_len) {
- *destbuf++ = bits;
+ run_length = 2;
+ while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
+ pixels_read++;
}
} else {
(*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
@@ -547,16 +577,18 @@ static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len,
static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
const uint8_t **srcbuf, int buf_size,
- int non_mod, uint8_t *map_table)
+ int non_mod, uint8_t *map_table, int x_pos)
{
GetBitContext gb;
int bits;
int run_length;
- int pixels_read = 0;
+ int pixels_read = x_pos;
init_get_bits(&gb, *srcbuf, buf_size << 3);
+ destbuf += x_pos;
+
while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) {
bits = get_bits(&gb, 4);
@@ -636,14 +668,14 @@ static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
}
}
} else if (bits == 1) {
- pixels_read += 2;
if (map_table)
bits = map_table[0];
else
bits = 0;
- if (pixels_read <= dbuf_len) {
- *destbuf++ = bits;
+ run_length = 2;
+ while (run_length-- > 0 && pixels_read < dbuf_len) {
*destbuf++ = bits;
+ pixels_read++;
}
} else {
if (map_table)
@@ -668,12 +700,14 @@ static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len,
static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len,
const uint8_t **srcbuf, int buf_size,
- int non_mod, uint8_t *map_table)
+ int non_mod, uint8_t *map_table, int x_pos)
{
const uint8_t *sbuf_end = (*srcbuf) + buf_size;
int bits;
int run_length;
- int pixels_read = 0;
+ int pixels_read = x_pos;
+
+ destbuf += x_pos;
while (*srcbuf < sbuf_end && pixels_read < dbuf_len) {
bits = *(*srcbuf)++;
@@ -742,6 +776,7 @@ static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDis
0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
uint8_t *map_table;
+#if 0
av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size,
top_bottom ? "bottom" : "top");
@@ -756,21 +791,22 @@ static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDis
if (i % 16)
av_dlog(avctx, "\n");
+#endif
if (region == 0)
return;
pbuf = region->pbuf;
+ region->dirty = 1;
x_pos = display->x_pos;
y_pos = display->y_pos;
- if ((y_pos & 1) != top_bottom)
- y_pos++;
+ y_pos += top_bottom;
while (buf < buf_end) {
- if (x_pos > region->width || y_pos > region->height) {
- av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
+ if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf);
return;
}
@@ -783,9 +819,9 @@ static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDis
else
map_table = NULL;
- x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,
- region->width - x_pos, &buf, buf_end - buf,
- non_mod, map_table);
+ x_pos = dvbsub_read_2bit_string(pbuf + (y_pos * region->width),
+ region->width, &buf, buf_end - buf,
+ non_mod, map_table, x_pos);
break;
case 0x11:
if (region->depth < 4) {
@@ -798,9 +834,9 @@ static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDis
else
map_table = NULL;
- x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,
- region->width - x_pos, &buf, buf_end - buf,
- non_mod, map_table);
+ x_pos = dvbsub_read_4bit_string(pbuf + (y_pos * region->width),
+ region->width, &buf, buf_end - buf,
+ non_mod, map_table, x_pos);
break;
case 0x12:
if (region->depth < 8) {
@@ -808,9 +844,9 @@ static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDis
return;
}
- x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,
- region->width - x_pos, &buf, buf_end - buf,
- non_mod, NULL);
+ x_pos = dvbsub_read_8bit_string(pbuf + (y_pos * region->width),
+ region->width, &buf, buf_end - buf,
+ non_mod, NULL, x_pos);
break;
case 0x20:
@@ -845,7 +881,6 @@ static void dvbsub_parse_object_segment(AVCodecContext *avctx,
DVBSubContext *ctx = avctx->priv_data;
const uint8_t *buf_end = buf + buf_size;
- const uint8_t *block;
int object_id;
DVBSubObject *object;
DVBSubObjectDisplay *display;
@@ -876,7 +911,8 @@ static void dvbsub_parse_object_segment(AVCodecContext *avctx,
}
for (display = object->display_list; display; display = display->object_list_next) {
- block = buf;
+ const uint8_t *block = buf;
+ int bfl = bottom_field_len;
dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
non_modifying_color);
@@ -884,9 +920,9 @@ static void dvbsub_parse_object_segment(AVCodecContext *avctx,
if (bottom_field_len > 0)
block = buf + top_field_len;
else
- bottom_field_len = top_field_len;
+ bfl = top_field_len;
- dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,
+ dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1,
non_modifying_color);
}
@@ -898,13 +934,14 @@ static void dvbsub_parse_object_segment(AVCodecContext *avctx,
}
-static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
+static int dvbsub_parse_clut_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
DVBSubContext *ctx = avctx->priv_data;
const uint8_t *buf_end = buf + buf_size;
int i, clut_id;
+ int version;
DVBSubCLUT *clut;
int entry_id, depth , full_range;
int y, cr, cb, alpha;
@@ -922,6 +959,7 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
av_dlog(avctx, "\n");
clut_id = *buf++;
+ version = ((*buf)>>4)&15;
buf += 1;
clut = get_clut(ctx, clut_id);
@@ -932,11 +970,16 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
memcpy(clut, &default_clut, sizeof(DVBSubCLUT));
clut->id = clut_id;
+ clut->version = -1;
clut->next = ctx->clut_list;
ctx->clut_list = clut;
}
+ if (clut->version != version) {
+
+ clut->version = version;
+
while (buf + 4 < buf_end) {
entry_id = *buf++;
@@ -944,7 +987,7 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
if (depth == 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
- return;
+ return 0;
}
full_range = (*buf++) & 1;
@@ -970,14 +1013,21 @@ static void dvbsub_parse_clut_segment(AVCodecContext *avctx,
YUV_TO_RGB2_CCIR(r, g, b, y);
av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
+ if (!!(depth & 0x80) + !!(depth & 0x40) + !!(depth & 0x20) > 1) {
+ av_dlog(avctx, "More than one bit level marked: %x\n", depth);
+ if (avctx->strict_std_compliance > FF_COMPLIANCE_NORMAL)
+ return AVERROR_INVALIDDATA;
+ }
if (depth & 0x80)
clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
- if (depth & 0x40)
+ else if (depth & 0x40)
clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
- if (depth & 0x20)
+ else if (depth & 0x20)
clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
}
+ }
+ return 0;
}
@@ -988,6 +1038,7 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,
const uint8_t *buf_end = buf + buf_size;
int region_id, object_id;
+ int av_unused version;
DVBSubRegion *region;
DVBSubObject *object;
DVBSubObjectDisplay *display;
@@ -1004,11 +1055,13 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,
region = av_mallocz(sizeof(DVBSubRegion));
region->id = region_id;
+ region->version = -1;
region->next = ctx->region_list;
ctx->region_list = region;
}
+ version = ((*buf)>>4) & 15;
fill = ((*buf++) >> 3) & 1;
region->width = AV_RB16(buf);
@@ -1024,6 +1077,7 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,
region->pbuf = av_malloc(region->buf_size);
fill = 1;
+ region->dirty = 0;
}
region->depth = 1 << (((*buf++) >> 2) & 7);
@@ -1033,9 +1087,10 @@ static void dvbsub_parse_region_segment(AVCodecContext *avctx,
}
region->clut = *buf++;
- if (region->depth == 8)
+ if (region->depth == 8) {
region->bgcolor = *buf++;
- else {
+ buf += 1;
+ } else {
buf += 1;
if (region->depth == 4)
@@ -1102,22 +1157,31 @@ static void dvbsub_parse_page_segment(AVCodecContext *avctx,
const uint8_t *buf_end = buf + buf_size;
int region_id;
int page_state;
+ int timeout;
+ int version;
if (buf_size < 1)
return;
- ctx->time_out = *buf++;
+ timeout = *buf++;
+ version = ((*buf)>>4) & 15;
page_state = ((*buf++) >> 2) & 3;
+ if (ctx->version != version) {
+
+ ctx->time_out = timeout;
+ ctx->version = version;
+
av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state);
- if (page_state == 2) {
- delete_state(ctx);
+ if (page_state == 1 || page_state == 2) {
+ delete_regions(ctx);
+ delete_objects(ctx);
+ delete_cluts(ctx);
}
tmp_display_list = ctx->display_list;
ctx->display_list = NULL;
- ctx->display_list_size = 0;
while (buf + 5 < buf_end) {
region_id = *buf++;
@@ -1145,7 +1209,6 @@ static void dvbsub_parse_page_segment(AVCodecContext *avctx,
display->next = ctx->display_list;
ctx->display_list = display;
- ctx->display_list_size++;
av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
}
@@ -1157,6 +1220,7 @@ static void dvbsub_parse_page_segment(AVCodecContext *avctx,
av_free(display);
}
+ }
}
@@ -1284,14 +1348,18 @@ static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx,
display_def->y = 0;
display_def->width = bytestream_get_be16(&buf) + 1;
display_def->height = bytestream_get_be16(&buf) + 1;
+ if (!avctx->width || !avctx->height) {
+ avctx->width = display_def->width;
+ avctx->height = display_def->height;
+ }
if (buf_size < 13)
return;
if (info_byte & 1<<3) { // display_window_flag
display_def->x = bytestream_get_be16(&buf);
- display_def->y = bytestream_get_be16(&buf);
display_def->width = bytestream_get_be16(&buf) - display_def->x + 1;
+ display_def->y = bytestream_get_be16(&buf);
display_def->height = bytestream_get_be16(&buf) - display_def->y + 1;
}
}
@@ -1310,38 +1378,43 @@ static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
int i;
int offset_x=0, offset_y=0;
- sub->rects = NULL;
- sub->start_display_time = 0;
sub->end_display_time = ctx->time_out * 1000;
- sub->format = 0;
if (display_def) {
offset_x = display_def->x;
offset_y = display_def->y;
}
- sub->num_rects = ctx->display_list_size;
+ sub->num_rects = 0;
+ for (display = ctx->display_list; display; display = display->next)
+ {
+ region = get_region(ctx, display->region_id);
+ if (region && region->dirty)
+ sub->num_rects++;
+ }
if (sub->num_rects > 0){
sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects);
for(i=0; i<sub->num_rects; i++)
sub->rects[i] = av_mallocz(sizeof(*sub->rects[i]));
- }
i = 0;
for (display = ctx->display_list; display; display = display->next) {
region = get_region(ctx, display->region_id);
- rect = sub->rects[i];
if (!region)
continue;
+ if (!region->dirty)
+ continue;
+
+ rect = sub->rects[i];
rect->x = display->x_pos + offset_x;
rect->y = display->y_pos + offset_y;
rect->w = region->width;
rect->h = region->height;
- rect->nb_colors = 16;
+ rect->nb_colors = (1 << region->depth);
rect->type = SUBTITLE_BITMAP;
rect->pict.linesize[0] = region->width;
@@ -1371,9 +1444,7 @@ static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf,
i++;
}
-
- sub->num_rects = i;
-
+ }
#ifdef DEBUG
save_display_set(ctx);
#endif
@@ -1394,6 +1465,8 @@ static int dvbsub_decode(AVCodecContext *avctx,
int page_id;
int segment_length;
int i;
+ int ret;
+ int got_segment = 0;
av_dlog(avctx, "DVB sub packet:\n");
@@ -1432,20 +1505,27 @@ static int dvbsub_decode(AVCodecContext *avctx,
switch (segment_type) {
case DVBSUB_PAGE_SEGMENT:
dvbsub_parse_page_segment(avctx, p, segment_length);
+ got_segment |= 1;
break;
case DVBSUB_REGION_SEGMENT:
dvbsub_parse_region_segment(avctx, p, segment_length);
+ got_segment |= 2;
break;
case DVBSUB_CLUT_SEGMENT:
- dvbsub_parse_clut_segment(avctx, p, segment_length);
+ ret = dvbsub_parse_clut_segment(avctx, p, segment_length);
+ if (ret < 0) return ret;
+ got_segment |= 4;
break;
case DVBSUB_OBJECT_SEGMENT:
dvbsub_parse_object_segment(avctx, p, segment_length);
+ got_segment |= 8;
break;
case DVBSUB_DISPLAYDEFINITION_SEGMENT:
dvbsub_parse_display_definition_segment(avctx, p, segment_length);
+ break;
case DVBSUB_DISPLAY_SEGMENT:
*data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
+ got_segment |= 16;
break;
default:
av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n",
@@ -1456,6 +1536,10 @@ static int dvbsub_decode(AVCodecContext *avctx,
p += segment_length;
}
+ // Some streams do not send a display segment but if we have all the other
+ // segments then we need no further data.
+ if (got_segment == 15 && sub)
+ *data_size = dvbsub_display_end_segment(avctx, p, 0, sub);
return p - buf;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 14:26:28 +0000