[FFmpeg-devel] [PATCH] avcodec/sheervideo: Hack to extract init_vlc style tables for RGB [not to be pushed]

[Michael Niedermayer]

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/sheervideo.c |   33 +++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/libavcodec/sheervideo.c b/libavcodec/sheervideo.c
index e41645e..88fb174 100644
--- a/libavcodec/sheervideo.c
+++ b/libavcodec/sheervideo.c
@@ -1029,14 +1029,15 @@ static int decode_frame(AVCodecContext *avctx,
     unsigned format;
     int ret;
 
-    if (avpkt->size <= 20)
-        return AVERROR_INVALIDDATA;
-
-    if (AV_RL32(avpkt->data) != MKTAG('S','h','i','r'))
-        return AVERROR_INVALIDDATA;
+//     if (avpkt->size <= 20)
+//         return AVERROR_INVALIDDATA;
+//
+//     if (AV_RL32(avpkt->data) != MKTAG('S','h','i','r'))
+//         return AVERROR_INVALIDDATA;
 
     format = AV_RL32(avpkt->data + 16);
     switch (format) {
+    default:
     case MKTAG(' ', 'R', 'G', 'B'):
         avctx->pix_fmt = AV_PIX_FMT_RGB0;
         s->lut_l[0] = (uint8_t *)&lut_r;
@@ -1059,11 +1060,31 @@ static int decode_frame(AVCodecContext *avctx,
         s->lut_s[3] = (uint8_t *)&lut_sbg;
         s->decode_frame = decode_argb;
         break;
-    default:
+
         avpriv_report_missing_feature(avctx, "unsupported format: 0x%X", format);
         return AVERROR_PATCHWELCOME;
     }
 
+    for(int table=0; table < 3; table++) {
+        uint8_t array[32];
+        uint64_t index=0;
+        int code, len;
+        av_log(0,0, "Table %d\n", table);
+        for(;;) {
+            AV_WB64(array, index);
+            if ((ret = init_get_bits8(&gb, array, sizeof(array))) < 0)
+                return ret;
+            code = get_vlc3(&gb, s->lut_l[table], s->lut_s[table]) & 0xFF;
+            len = get_bits_count(&gb);
+            av_log(0,0, "code: %5d, len:%2d, bits:%8LX\n", code, len, index >> (64 - len));
+            index += 1ULL << (64-len);
+            if(!index)
+                break;
+        }
+    }
+    exit(0);
+
+
     p->pict_type = AV_PICTURE_TYPE_I;
     p->key_frame = 1;
 
-- 
1.7.9.5