wmapro: change max. block size to 13 bits.

WMApro actually support 13-bits block sizes (potentially even up to 14),
and thus we should support that also. If we get block sizes beyond what
the decoder can handle (14 is possible depending on s->decode_flags),
error out instead of crashing.

libavcodec/sinewin.h

@@ -53,7 +53,8 @@ extern SINETABLE( 512);
 extern SINETABLE(1024);
 extern SINETABLE(2048);
 extern SINETABLE(4096);
+extern SINETABLE(8192);
 
-extern SINETABLE_CONST float * const ff_sine_windows[13];
+extern SINETABLE_CONST float * const ff_sine_windows[14];
 
 #endif /* AVCODEC_SINEWIN_H */

libavcodec/sinewin_tablegen.c

@@ -38,7 +38,7 @@ int main(void)
 
     write_fileheader();
 
-    for (i = 5; i <= 12; i++) {
+    for (i = 5; i <= 13; i++) {
         ff_init_ff_sine_windows(i);
         printf("SINETABLE(%4i) = {\n", 1 << i);
         write_float_array(ff_sine_windows[i], 1 << i);

libavcodec/sinewin_tablegen.h

@@ -38,6 +38,7 @@ SINETABLE( 512);
 SINETABLE(1024);
 SINETABLE(2048);
 SINETABLE(4096);
+SINETABLE(8192);
 #else
 #include "libavcodec/sinewin_tables.h"
 #endif
@@ -45,7 +46,7 @@ SINETABLE(4096);
 SINETABLE_CONST float * const ff_sine_windows[] = {
     NULL, NULL, NULL, NULL, NULL, // unused
     ff_sine_32 , ff_sine_64 ,
-    ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096
+    ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096, ff_sine_8192
 };
 
 // Generate a sine window.

libavcodec/wmaprodec.c

@@ -105,7 +105,7 @@
 #define MAX_FRAMESIZE  32768                                 ///< maximum compressed frame size
 
 #define WMAPRO_BLOCK_MIN_BITS  6                                           ///< log2 of min block size
-#define WMAPRO_BLOCK_MAX_BITS 12                                           ///< log2 of max block size
+#define WMAPRO_BLOCK_MAX_BITS 13                                           ///< log2 of max block size
 #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS)                 ///< maximum block size
 #define WMAPRO_BLOCK_SIZES    (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes
 
@@ -276,7 +276,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
     WMAProDecodeCtx *s = avctx->priv_data;
     uint8_t *edata_ptr = avctx->extradata;
     unsigned int channel_mask;
-    int i;
+    int i, bits;
     int log2_max_num_subframes;
     int num_possible_block_sizes;
 
@@ -310,8 +310,12 @@ static av_cold int decode_init(AVCodecContext *avctx)
     s->len_prefix  = (s->decode_flags & 0x40);
 
     /** get frame len */
-    s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
-                                                          3, s->decode_flags);
+    bits = ff_wma_get_frame_len_bits(avctx->sample_rate, 3, s->decode_flags);
+    if (bits > WMAPRO_BLOCK_MAX_BITS) {
+        av_log_missing_feature(avctx, "14-bits block sizes", 1);
+        return AVERROR_INVALIDDATA;
+    }
+    s->samples_per_frame = 1 << bits;
 
     /** subframe info */
     log2_max_num_subframes       = ((s->decode_flags & 0x38) >> 3);