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-rw-r--r--libavcodec/dvdsubdec.c245
1 files changed, 182 insertions, 63 deletions
diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c
index 6b168cb352..637f3e6147 100644
--- a/libavcodec/dvdsubdec.c
+++ b/libavcodec/dvdsubdec.c
@@ -2,20 +2,20 @@
* DVD subtitle decoding
* Copyright (c) 2005 Fabrice Bellard
*
- * 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"
@@ -25,12 +25,23 @@
#include "libavutil/attributes.h"
#include "libavutil/colorspace.h"
+#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/avstring.h"
-typedef struct DVDSubContext {
- uint32_t palette[16];
- int has_palette;
+typedef struct DVDSubContext
+{
+ AVClass *class;
+ uint32_t palette[16];
+ char *palette_str;
+ int has_palette;
+ uint8_t colormap[4];
+ uint8_t alpha[256];
+ uint8_t *buf;
+ int buf_size;
+#ifdef DEBUG
+ int sub_id;
+#endif
} DVDSubContext;
static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
@@ -125,17 +136,24 @@ static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
static void guess_palette(DVDSubContext* ctx,
uint32_t *rgba_palette,
- uint8_t *colormap,
- uint8_t *alpha,
uint32_t subtitle_color)
{
+ static const uint8_t level_map[4][4] = {
+ // this configuration (full range, lowest to highest) in tests
+ // seemed most common, so assume this
+ {0xff},
+ {0x00, 0xff},
+ {0x00, 0x80, 0xff},
+ {0x00, 0x55, 0xaa, 0xff},
+ };
uint8_t color_used[16] = { 0 };
int nb_opaque_colors, i, level, j, r, g, b;
+ uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
- if (ctx->has_palette) {
- for (i = 0; i < 4; i++)
+ if(ctx->has_palette) {
+ for(i = 0; i < 4; i++)
rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
- | ((alpha[i] * 17) << 24);
+ | ((alpha[i] * 17U) << 24);
return;
}
@@ -153,18 +171,18 @@ static void guess_palette(DVDSubContext* ctx,
if (nb_opaque_colors == 0)
return;
- j = nb_opaque_colors;
+ j = 0;
memset(color_used, 0, 16);
for(i = 0; i < 4; i++) {
if (alpha[i] != 0) {
if (!color_used[colormap[i]]) {
- level = (0xff * j) / nb_opaque_colors;
+ level = level_map[nb_opaque_colors][j];
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[colormap[i]] = (i + 1);
- j--;
+ j++;
} else {
rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
((alpha[i] * 17) << 24);
@@ -173,6 +191,21 @@ static void guess_palette(DVDSubContext* ctx,
}
}
+static void reset_rects(AVSubtitle *sub_header)
+{
+ int i;
+
+ if (sub_header->rects != NULL) {
+ for (i = 0; i < sub_header->num_rects; i++) {
+ av_freep(&sub_header->rects[i]->pict.data[0]);
+ av_freep(&sub_header->rects[i]->pict.data[1]);
+ av_freep(&sub_header->rects[i]);
+ }
+ av_freep(&sub_header->rects);
+ sub_header->num_rects = 0;
+ }
+}
+
#define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
@@ -181,14 +214,13 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
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] = { 0 }, alpha[256] = { 0 };
+ uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
int date;
int i;
int is_menu = 0;
if (buf_size < 10)
return -1;
- memset(sub_header, 0, sizeof(*sub_header));
if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
big_offsets = 1;
@@ -202,6 +234,9 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
cmd_pos = READ_OFFSET(buf + cmd_pos);
+ if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size)
+ return AVERROR(EAGAIN);
+
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);
@@ -314,15 +349,7 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
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_freep(&sub_header->rects[i]->pict.data[0]);
- av_freep(&sub_header->rects[i]->pict.data[1]);
- av_freep(&sub_header->rects[i]);
- }
- av_freep(&sub_header->rects);
- sub_header->num_rects = 0;
- }
+ reset_rects(sub_header);
bitmap = av_malloc(w * h);
sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
@@ -341,9 +368,8 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
yuv_a_to_rgba(yuv_palette, alpha, (uint32_t*)sub_header->rects[0]->pict.data[1], 256);
} else {
sub_header->rects[0]->nb_colors = 4;
- guess_palette(ctx,
- (uint32_t*)sub_header->rects[0]->pict.data[1],
- colormap, alpha, 0xffff00);
+ guess_palette(ctx, (uint32_t*)sub_header->rects[0]->pict.data[1],
+ 0xffff00);
}
sub_header->rects[0]->x = x1;
sub_header->rects[0]->y = y1;
@@ -351,8 +377,13 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
sub_header->rects[0]->h = h;
sub_header->rects[0]->type = SUBTITLE_BITMAP;
sub_header->rects[0]->pict.linesize[0] = w;
+ sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
}
}
+ if (next_cmd_pos < cmd_pos) {
+ av_log(NULL, AV_LOG_ERROR, "Invalid command offset\n");
+ break;
+ }
if (next_cmd_pos == cmd_pos)
break;
cmd_pos = next_cmd_pos;
@@ -360,15 +391,7 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
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_freep(&sub_header->rects[i]->pict.data[0]);
- av_freep(&sub_header->rects[i]->pict.data[1]);
- av_freep(&sub_header->rects[i]);
- }
- av_freep(&sub_header->rects);
- sub_header->num_rects = 0;
- }
+ reset_rects(sub_header);
return -1;
}
@@ -448,7 +471,7 @@ static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
f = fopen(filename, "w");
if (!f) {
perror(filename);
- exit(1);
+ return;
}
fprintf(f, "P6\n"
"%d %d\n"
@@ -466,6 +489,25 @@ static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
}
#endif
+static int append_to_cached_buf(AVCodecContext *avctx,
+ const uint8_t *buf, int buf_size)
+{
+ DVDSubContext *ctx = avctx->priv_data;
+
+ if (ctx->buf_size > 0xffff - buf_size) {
+ av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct "
+ "too large SPU packets aborted.\n");
+ av_freep(&ctx->buf);
+ return AVERROR_INVALIDDATA;
+ }
+ ctx->buf = av_realloc(ctx->buf, ctx->buf_size + buf_size);
+ if (!ctx->buf)
+ return AVERROR(ENOMEM);
+ memcpy(ctx->buf + ctx->buf_size, buf, buf_size);
+ ctx->buf_size += buf_size;
+ return 0;
+}
+
static int dvdsub_decode(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
@@ -476,7 +518,21 @@ static int dvdsub_decode(AVCodecContext *avctx,
AVSubtitle *sub = data;
int is_menu;
+ if (ctx->buf) {
+ int ret = append_to_cached_buf(avctx, buf, buf_size);
+ if (ret < 0) {
+ *data_size = 0;
+ return ret;
+ }
+ buf = ctx->buf;
+ buf_size = ctx->buf_size;
+ }
+
is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
+ if (is_menu == AVERROR(EAGAIN)) {
+ *data_size = 0;
+ return append_to_cached_buf(avctx, buf, buf_size);
+ }
if (is_menu < 0) {
no_subtitle:
@@ -488,57 +544,118 @@ static int dvdsub_decode(AVCodecContext *avctx,
goto no_subtitle;
#if defined(DEBUG)
+ {
+ char ppm_name[32];
+
+ snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++);
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],
+ ppm_save(ppm_name, sub->rects[0]->pict.data[0],
sub->rects[0]->w, sub->rects[0]->h, sub->rects[0]->pict.data[1]);
+ }
#endif
+ av_freep(&ctx->buf);
+ ctx->buf_size = 0;
*data_size = 1;
return buf_size;
}
-static av_cold int dvdsub_init(AVCodecContext *avctx)
+static void parse_palette(DVDSubContext *ctx, char *p)
{
- DVDSubContext *ctx = avctx->priv_data;
- char *data, *cur;
+ int i;
+
+ ctx->has_palette = 1;
+ for(i=0;i<16;i++) {
+ ctx->palette[i] = strtoul(p, &p, 16);
+ while(*p == ',' || av_isspace(*p))
+ p++;
+ }
+}
+
+static int dvdsub_parse_extradata(AVCodecContext *avctx)
+{
+ DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
+ char *dataorig, *data;
if (!avctx->extradata || !avctx->extradata_size)
- return 0;
+ return 1;
- data = av_malloc(avctx->extradata_size + 1);
+ dataorig = 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)) {
+
+ for(;;) {
+ int pos = strcspn(data, "\n\r");
+ if (pos==0 && *data==0)
+ break;
+
+ if (strncmp("palette:", data, 8) == 0) {
+ parse_palette(ctx, data + 8);
+ } else if (strncmp("size:", data, 5) == 0) {
int w, h;
- if (sscanf(cur + 5, "%dx%d", &w, &h) == 2) {
+ if (sscanf(data + 5, "%dx%d", &w, &h) == 2) {
int ret = ff_set_dimensions(avctx, w, h);
- if (ret < 0)
+ if (ret < 0) {
+ av_free(dataorig);
return ret;
+ }
}
}
- cur += strcspn(cur, "\n\r");
- cur += strspn(cur, "\n\r");
+
+ data += pos;
+ data += strspn(data, "\n\r");
}
- av_free(data);
+
+ av_free(dataorig);
+ return 1;
+}
+
+static av_cold int dvdsub_init(AVCodecContext *avctx)
+{
+ DVDSubContext *ctx = avctx->priv_data;
+ int ret;
+
+ if ((ret = dvdsub_parse_extradata(avctx)) < 0)
+ return ret;
+
+ if (ctx->palette_str)
+ parse_palette(ctx, ctx->palette_str);
+ if (ctx->has_palette) {
+ int i;
+ av_log(avctx, AV_LOG_DEBUG, "palette:");
+ for(i=0;i<16;i++)
+ av_log(avctx, AV_LOG_DEBUG, " 0x%06x", ctx->palette[i]);
+ av_log(avctx, AV_LOG_DEBUG, "\n");
+ }
+
+ return 1;
+}
+
+static av_cold int dvdsub_close(AVCodecContext *avctx)
+{
+ DVDSubContext *ctx = avctx->priv_data;
+ av_freep(&ctx->buf);
+ ctx->buf_size = 0;
return 0;
}
+#define OFFSET(field) offsetof(DVDSubContext, field)
+#define VD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+ { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, VD },
+ { NULL }
+};
+static const AVClass dvdsub_class = {
+ .class_name = "dvdsubdec",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
AVCodec ff_dvdsub_decoder = {
.name = "dvdsub",
.long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
@@ -547,4 +664,6 @@ AVCodec ff_dvdsub_decoder = {
.priv_data_size = sizeof(DVDSubContext),
.init = dvdsub_init,
.decode = dvdsub_decode,
+ .close = dvdsub_close,
+ .priv_class = &dvdsub_class,
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 14:17:04 +0000