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avcodec/dvdsubdec: New option for obtaining global palette from .IFO file (experimental)

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Suggested-by: Nicolas George <george@nsup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Shin-ichi Toyama 2014-11-15 12:42:30 +09:00 committed by Michael Niedermayer
parent b08fd7ea78
commit 12630fa821
3 changed files with 61 additions and 1 deletions
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4
doc/decoders.texi
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@ -191,6 +191,10 @@ numbers (without 0x prefix) separated by comas, for example @code{0d00ee,
ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1,
7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b}.
@item ifo_palette
Specify the the IFO file from which the global palette is obtained.
(experimental)
@item forced_subs_only
Only decode subtitle entries marked as forced. Some titles have forced
and non-forced subtitles in the same track. Setting this flag to @code{1}

56
libavcodec/dvdsubdec.c
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@ -28,12 +28,14 @@
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/avstring.h"
#include "libavutil/bswap.h"
typedef struct DVDSubContext
{
AVClass *class;
uint32_t palette[16];
char *palette_str;
char *ifo_str;
int has_palette;
uint8_t colormap[4];
uint8_t alpha[256];
@ -583,6 +585,57 @@ static void parse_palette(DVDSubContext *ctx, char *p)
}
}
static int parse_ifo_palette(DVDSubContext *ctx, char *p)
{
FILE *ifo;
char ifostr[12];
uint32_t sp_pgci, pgci, off_pgc, pgc;
uint8_t r, g, b, yuv[65], *buf;
int i, y, cb, cr, r_add, g_add, b_add;
int ret = 0;
const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
ctx->has_palette = 0;
if ((ifo = fopen(p, "r")) == NULL) {
av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, strerror(errno));
return AVERROR_EOF;
}
if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) {
av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p);
ret = AVERROR_INVALIDDATA;
goto end;
}
fseek(ifo, 0xCC, SEEK_SET);
if (fread(&sp_pgci, 4, 1, ifo) == 1) {
pgci = av_be2ne32(sp_pgci) * 2048;
fseek(ifo, pgci + 0x0C, SEEK_SET);
if (fread(&off_pgc, 4, 1, ifo) == 1) {
pgc = pgci + av_be2ne32(off_pgc);
fseek(ifo, pgc + 0xA4, SEEK_SET);
if (fread(yuv, 64, 1, ifo) == 1) {
buf = yuv;
for(i=0; i<16; i++) {
y = *++buf;
cr = *++buf;
cb = *++buf;
YUV_TO_RGB1_CCIR(cb, cr);
YUV_TO_RGB2_CCIR(r, g, b, y);
ctx->palette[i] = (r << 16) + (g << 8) + b;
buf++;
}
ctx->has_palette = 1;
}
}
}
if (ctx->has_palette == 0) {
av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p);
ret = AVERROR_INVALIDDATA;
}
end:
fclose(ifo);
return ret;
}
static int dvdsub_parse_extradata(AVCodecContext *avctx)
{
DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
@ -631,6 +684,8 @@ static av_cold int dvdsub_init(AVCodecContext *avctx)
if ((ret = dvdsub_parse_extradata(avctx)) < 0)
return ret;
if (ctx->ifo_str)
parse_ifo_palette(ctx, ctx->ifo_str);
if (ctx->palette_str)
parse_palette(ctx, ctx->palette_str);
if (ctx->has_palette) {
@ -656,6 +711,7 @@ static av_cold int dvdsub_close(AVCodecContext *avctx)
#define SD 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, SD },
{ "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD },
{ "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD},
{ NULL }
};

2
libavcodec/version.h
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@ -30,7 +30,7 @@
#define LIBAVCODEC_VERSION_MAJOR 56
#define LIBAVCODEC_VERSION_MINOR 12
#define LIBAVCODEC_VERSION_MICRO 100
#define LIBAVCODEC_VERSION_MICRO 101
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \