[FFmpeg-devel] [PATCH v10 2/2] libavformat/dvdvideo: add DVD CLUT utilities and subtitle palette support

[Marth64 <marth64@proxyid.net>]

DVD subtitle palettes, which are natively YUV, are
currently carried as a hex string in their respective subtitle streams and
have no concept of colorspace tagging. In fact, the convention is to convert
them to RGB prior to storage. Common players will only render the palettes
properly if they are stored as RGB. Even ffmpeg itself expects this, and
already does -in libavformat- the YUV-RGB conversions, specifically in mov.c
and movenc.c.

The point of this patch is to provide a consolidation of the code
that deals with creating the extradata as well as the RGB conversion.
That can then (1) enable usable palette support for DVD demuxer if it is merged
and (2) start the process of consolidating the related conversions in
MOV muxer/demuxer and eventually find a way to properly tag
the colorspace.

Signed-off-by: Marth64 <marth64@proxyid.net>
---
 doc/demuxers.texi         |   5 ++
 libavformat/Makefile      |   2 +-
 libavformat/dvdclut.c     | 103 ++++++++++++++++++++++++++++++++++++++
 libavformat/dvdclut.h     |  37 ++++++++++++++
 libavformat/dvdvideodec.c |  14 ++++++
 5 files changed, 160 insertions(+), 1 deletion(-)
 create mode 100644 libavformat/dvdclut.c
 create mode 100644 libavformat/dvdclut.h

diff --git a/doc/demuxers.texi b/doc/demuxers.texi
index 062ea2ea42..d3c7675631 100644
--- a/doc/demuxers.texi
+++ b/doc/demuxers.texi
@@ -391,6 +391,11 @@ often with junk data intended for controlling a real DVD player's
 buffering speed and with no other material data value.
 Default is 1, true.
 
+@item clut_rgb @var{bool}
+Output subtitle palettes (CLUTs) as RGB, required for Matroska.
+Disable to output the palette in its original YUV colorspace.
+Default is 1, true.
+
 @end table
 
 @subsection Examples
diff --git a/libavformat/Makefile b/libavformat/Makefile
index df69734877..8f17e43e49 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -192,7 +192,7 @@ OBJS-$(CONFIG_DTS_MUXER)                 += rawenc.o
 OBJS-$(CONFIG_DV_MUXER)                  += dvenc.o
 OBJS-$(CONFIG_DVBSUB_DEMUXER)            += dvbsub.o rawdec.o
 OBJS-$(CONFIG_DVBTXT_DEMUXER)            += dvbtxt.o rawdec.o
-OBJS-$(CONFIG_DVDVIDEO_DEMUXER)          += dvdvideodec.o
+OBJS-$(CONFIG_DVDVIDEO_DEMUXER)          += dvdvideodec.o dvdclut.o
 OBJS-$(CONFIG_DXA_DEMUXER)               += dxa.o
 OBJS-$(CONFIG_EA_CDATA_DEMUXER)          += eacdata.o
 OBJS-$(CONFIG_EA_DEMUXER)                += electronicarts.o
diff --git a/libavformat/dvdclut.c b/libavformat/dvdclut.c
new file mode 100644
index 0000000000..91da5ad4e9
--- /dev/null
+++ b/libavformat/dvdclut.c
@@ -0,0 +1,103 @@
+/*
+ * DVD-Video subpicture CLUT (Color Lookup Table) utilities
+ *
+ * This file is part of FFmpeg.
+ *
+ * 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.
+ *
+ * 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/bprint.h"
+#include "libavutil/colorspace.h"
+
+#include "dvdclut.h"
+#include "internal.h"
+
+/* crop table for YUV to RGB subpicture palette conversion */
+#define DVDCLUT_YUV_NEG_CROP_MAX       1024
+#define times4(x)                      x, x, x, x
+#define times1024(x)                   times4(times4(times4(times4(times4(x)))))
+
+static const uint8_t dvdclut_yuv_crop_tab[256 + 2 * DVDCLUT_YUV_NEG_CROP_MAX] = {
+times1024(0x00),
+0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,
+0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
+0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,
+0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,
+0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,
+0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0x5B,0x5C,0x5D,0x5E,0x5F,
+0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,
+0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x7B,0x7C,0x7D,0x7E,0x7F,
+0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,
+0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,
+0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,
+0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF,
+0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,
+0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF,
+0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,
+0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF,
+times1024(0xFF)
+};
+
+int ff_dvdclut_palette_extradata_cat(const uint32_t *clut,
+                                     const size_t clut_size,
+                                     AVCodecParameters *par)
+{
+    int ret = 0;
+    AVBPrint bp;
+
+    if (clut_size != FF_DVDCLUT_CLUT_SIZE)
+        return AVERROR(EINVAL);
+
+    av_bprint_init(&bp, 0, FF_DVDCLUT_EXTRADATA_SIZE);
+
+    av_bprintf(&bp, "palette: ");
+
+    for (int i = 0; i < FF_DVDCLUT_CLUT_LEN; i++)
+        av_bprintf(&bp, "%06"PRIx32"%s", clut[i],
+                   i != (FF_DVDCLUT_CLUT_LEN - 1) ? ", " : "");
+
+    av_bprintf(&bp, "\n");
+
+    ret = ff_bprint_to_codecpar_extradata(par, &bp);
+
+    av_bprint_finalize(&bp, NULL);
+
+    return ret;
+}
+
+int ff_dvdclut_yuv_to_rgb(uint32_t *clut, const size_t clut_size)
+{
+    const uint8_t *cm = dvdclut_yuv_crop_tab + DVDCLUT_YUV_NEG_CROP_MAX;
+
+    int y, cb, cr;
+    uint8_t r, g, b;
+    int r_add, g_add, b_add;
+
+    if (clut_size != FF_DVDCLUT_CLUT_SIZE)
+        return AVERROR(EINVAL);
+
+    for (int i = 0; i < FF_DVDCLUT_CLUT_LEN; i++) {
+        y  = (clut[i] >> 16) & 0xFF;
+        cr = (clut[i] >> 8)  & 0xFF;
+        cb = clut[i]         & 0xFF;
+
+        YUV_TO_RGB1_CCIR(cb, cr);
+        YUV_TO_RGB2_CCIR(r, g, b, y);
+
+        clut[i] = (r << 16) | (g << 8) | b;
+    }
+
+    return 0;
+}
diff --git a/libavformat/dvdclut.h b/libavformat/dvdclut.h
new file mode 100644
index 0000000000..41cea7e2c9
--- /dev/null
+++ b/libavformat/dvdclut.h
@@ -0,0 +1,37 @@
+/*
+ * DVD-Video subpicture CLUT (Color Lookup Table) utilities
+ *
+ * This file is part of FFmpeg.
+ *
+ * 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.
+ *
+ * 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_DVDCLUT_H
+#define AVFORMAT_DVDCLUT_H
+
+#include "libavcodec/codec_par.h"
+
+/* ("palette: ") + ("rrggbb, "*15) + ("rrggbb") + \n + \0 */
+#define FF_DVDCLUT_EXTRADATA_SIZE        (9 + (8 * 15) + 6 + 1 + 1)
+#define FF_DVDCLUT_CLUT_LEN              16
+#define FF_DVDCLUT_CLUT_SIZE             FF_DVDCLUT_CLUT_LEN * sizeof(uint32_t)
+
+int ff_dvdclut_palette_extradata_cat(const uint32_t *clut,
+                                     const size_t clut_size,
+                                     AVCodecParameters *par);
+
+int ff_dvdclut_yuv_to_rgb(uint32_t *clut, const size_t clut_size);
+
+#endif /* AVFORMAT_DVDCLUT_H */
diff --git a/libavformat/dvdvideodec.c b/libavformat/dvdvideodec.c
index c8628609c9..a2eba0c05d 100644
--- a/libavformat/dvdvideodec.c
+++ b/libavformat/dvdvideodec.c
@@ -50,6 +50,7 @@
 #include "avio_internal.h"
 #include "avlanguage.h"
 #include "demux.h"
+#include "dvdclut.h"
 #include "internal.h"
 #include "url.h"
 
@@ -96,6 +97,7 @@ typedef struct DVDVideoPGCSubtitleStreamEntry {
     int                                 startcode;
     enum DVDVideoSubpictureViewport     viewport;
     int                                 disposition;
+    uint32_t                            clut[FF_DVDCLUT_CLUT_LEN];
     const char                          *lang_iso;
 } DVDVideoPGCSubtitleStreamEntry;
 
@@ -129,6 +131,7 @@ typedef struct DVDVideoDemuxContext {
     int                         opt_angle;          /* the user-provided angle number (1-indexed) */
     int                         opt_chapter_end;    /* the user-provided exit PTT (0 for last) */
     int                         opt_chapter_start;  /* the user-provided entry PTT (1-indexed) */
+    int                         opt_clut_rgb;       /* output subtitle palette (CLUT) as RGB */
     int                         opt_pg;             /* the user-provided PG number (1-indexed) */
     int                         opt_pgc;            /* the user-provided PGC number (1-indexed) */
     int                         opt_preindex;       /* pre-indexing mode (2-pass read) */
@@ -1041,6 +1044,8 @@ break_error:
 static int dvdvideo_subp_stream_analyze(AVFormatContext *s, uint32_t offset, subp_attr_t subp_attr,
                                         DVDVideoPGCSubtitleStreamEntry *entry)
 {
+    DVDVideoDemuxContext *c = s->priv_data;
+
     char lang_dvd[3] = {0};
 
     entry->startcode = 0x20 + (offset & 0x1F);
@@ -1048,6 +1053,11 @@ static int dvdvideo_subp_stream_analyze(AVFormatContext *s, uint32_t offset, sub
     if (subp_attr.lang_extension == 9)
         entry->disposition |= AV_DISPOSITION_FORCED;
 
+    memcpy(&entry->clut, c->play_state.pgc->palette, FF_DVDCLUT_CLUT_SIZE);
+
+    if (c->opt_clut_rgb)
+        ff_dvdclut_yuv_to_rgb(entry->clut, FF_DVDCLUT_CLUT_SIZE);
+
     AV_WB16(lang_dvd, subp_attr.lang_code);
     entry->lang_iso = ff_convert_lang_to(lang_dvd, AV_LANG_ISO639_2_BIBL);
 
@@ -1069,6 +1079,9 @@ static int dvdvideo_subp_stream_add(AVFormatContext *s, DVDVideoPGCSubtitleStrea
     st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
     st->codecpar->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
 
+    if ((ret = ff_dvdclut_palette_extradata_cat(entry->clut, FF_DVDCLUT_CLUT_SIZE, st->codecpar)) < 0)
+        return ret;
+
     if (entry->lang_iso)
         av_dict_set(&st->metadata, "language", entry->lang_iso, 0);
 
@@ -1390,6 +1403,7 @@ static const AVOption dvdvideo_options[] = {
     {"angle",           "playback angle number",                                    OFFSET(opt_angle),          AV_OPT_TYPE_INT,    { .i64=1 },     1,          9,         AV_OPT_FLAG_DECODING_PARAM },
     {"chapter_end",     "exit chapter (PTT) number (0=end)",                        OFFSET(opt_chapter_end),    AV_OPT_TYPE_INT,    { .i64=0 },     0,          99,        AV_OPT_FLAG_DECODING_PARAM },
     {"chapter_start",   "entry chapter (PTT) number",                               OFFSET(opt_chapter_start),  AV_OPT_TYPE_INT,    { .i64=1 },     1,          99,        AV_OPT_FLAG_DECODING_PARAM },
+    {"clut_rgb",        "output subtitle palette (CLUT) as RGB",                    OFFSET(opt_clut_rgb),       AV_OPT_TYPE_BOOL,   { .i64=1 },     0,          1,         AV_OPT_FLAG_DECODING_PARAM },
     {"pg",              "entry PG number (0=auto)",                                 OFFSET(opt_pg),             AV_OPT_TYPE_INT,    { .i64=0 },     0,          255,       AV_OPT_FLAG_DECODING_PARAM },
     {"pgc",             "entry PGC number (0=auto)",                                OFFSET(opt_pgc),            AV_OPT_TYPE_INT,    { .i64=0 },     0,          999,       AV_OPT_FLAG_DECODING_PARAM },
     {"preindex",        "enable for accurate chapter markers, slow (2-pass read)",  OFFSET(opt_preindex),       AV_OPT_TYPE_BOOL,   { .i64=0 },     0,          1,         AV_OPT_FLAG_DECODING_PARAM },
-- 
2.34.1

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