asvdec: Convert to the new bitstream reader

Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/asv.h

@@ -31,11 +31,11 @@
 #include "libavutil/mem.h"
 
 #include "avcodec.h"
+#include "bitstream.h"
 #include "blockdsp.h"
 #include "bswapdsp.h"
 #include "fdctdsp.h"
 #include "idctdsp.h"
-#include "get_bits.h"
 #include "pixblockdsp.h"
 #include "put_bits.h"
 
@@ -47,7 +47,7 @@ typedef struct ASV1Context {
     IDCTDSPContext idsp;
     PixblockDSPContext pdsp;
     PutBitContext pb;
-    GetBitContext gb;
+    BitstreamContext bc;
     ScanTable scantable;
     int inv_qscale;
     int mb_width;

libavcodec/asvdec.c

@@ -70,27 +70,27 @@ static av_cold void init_vlcs(ASV1Context *a)
 }
 
 // FIXME write a reversed bitstream reader to avoid the double reverse
-static inline int asv2_get_bits(GetBitContext *gb, int n)
+static inline int asv2_get_bits(BitstreamContext *bc, int n)
 {
-    return ff_reverse[get_bits(gb, n) << (8 - n)];
+    return ff_reverse[bitstream_read(bc, n) << (8 - n)];
 }
 
-static inline int asv1_get_level(GetBitContext *gb)
+static inline int asv1_get_level(BitstreamContext *bc)
 {
-    int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
+    int code = bitstream_read_vlc(bc, level_vlc.table, VLC_BITS, 1);
 
     if (code == 3)
-        return get_sbits(gb, 8);
+        return bitstream_read_signed(bc, 8);
     else
         return code - 3;
 }
 
-static inline int asv2_get_level(GetBitContext *gb)
+static inline int asv2_get_level(BitstreamContext *bc)
 {
-    int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
+    int code = bitstream_read_vlc(bc, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
 
     if (code == 31)
-        return (int8_t) asv2_get_bits(gb, 8);
+        return (int8_t) asv2_get_bits(bc, 8);
     else
         return code - 31;
 }
@@ -99,10 +99,10 @@ static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
 {
     int i;
 
-    block[0] = 8 * get_bits(&a->gb, 8);
+    block[0] = 8 * bitstream_read(&a->bc, 8);
 
     for (i = 0; i < 11; i++) {
-        const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
+        const int ccp = bitstream_read_vlc(&a->bc, ccp_vlc.table, VLC_BITS, 1);
 
         if (ccp) {
             if (ccp == 16)
@@ -113,13 +113,13 @@ static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
             }
 
             if (ccp & 8)
-                block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
+                block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->bc) * a->intra_matrix[4 * i + 0]) >> 4;
             if (ccp & 4)
-                block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
+                block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->bc) * a->intra_matrix[4 * i + 1]) >> 4;
             if (ccp & 2)
-                block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
+                block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->bc) * a->intra_matrix[4 * i + 2]) >> 4;
             if (ccp & 1)
-                block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
+                block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->bc) * a->intra_matrix[4 * i + 3]) >> 4;
         }
     }
 
@@ -130,32 +130,32 @@ static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
 {
     int i, count, ccp;
 
-    count = asv2_get_bits(&a->gb, 4);
+    count = asv2_get_bits(&a->bc, 4);
 
-    block[0] = 8 * asv2_get_bits(&a->gb, 8);
+    block[0] = 8 * asv2_get_bits(&a->bc, 8);
 
-    ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
+    ccp = bitstream_read_vlc(&a->bc, dc_ccp_vlc.table, VLC_BITS, 1);
     if (ccp) {
         if (ccp & 4)
-            block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
+            block[a->scantable.permutated[1]] = (asv2_get_level(&a->bc) * a->intra_matrix[1]) >> 4;
         if (ccp & 2)
-            block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
+            block[a->scantable.permutated[2]] = (asv2_get_level(&a->bc) * a->intra_matrix[2]) >> 4;
         if (ccp & 1)
-            block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
+            block[a->scantable.permutated[3]] = (asv2_get_level(&a->bc) * a->intra_matrix[3]) >> 4;
     }
 
     for (i = 1; i < count + 1; i++) {
-        const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
+        const int ccp = bitstream_read_vlc(&a->bc, ac_ccp_vlc.table, VLC_BITS, 1);
 
         if (ccp) {
             if (ccp & 8)
-                block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
+                block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->bc) * a->intra_matrix[4 * i + 0]) >> 4;
             if (ccp & 4)
-                block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
+                block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->bc) * a->intra_matrix[4 * i + 1]) >> 4;
             if (ccp & 2)
-                block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
+                block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->bc) * a->intra_matrix[4 * i + 2]) >> 4;
             if (ccp & 1)
-                block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
+                block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->bc) * a->intra_matrix[4 * i + 3]) >> 4;
         }
     }
 
@@ -232,7 +232,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
             a->bitstream_buffer[i] = ff_reverse[buf[i]];
     }
 
-    init_get_bits(&a->gb, a->bitstream_buffer, buf_size * 8);
+    bitstream_init(&a->bc, a->bitstream_buffer, buf_size * 8);
 
     for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
         for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
@@ -267,7 +267,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
 
     emms_c();
 
-    return (get_bits_count(&a->gb) + 31) / 32 * 4;
+    return (bitstream_tell(&a->bc) + 31) / 32 * 4;
 }
 
 static av_cold int decode_init(AVCodecContext *avctx)