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

Suggested-by: Nicolas George <george@nsup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 56 insertions, 0 deletions

diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c
index bb28d9e3b7..d165934cc3 100644
--- a/libavcodec/dvdsubdec.c
+++ b/libavcodec/dvdsubdec.c
@@ -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 }
 };