diff options
Diffstat (limited to 'libavcodec/ac3dec.c')
| -rw-r--r-- | libavcodec/ac3dec.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index 808274adc5..7f7efe56ba 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -724,32 +724,34 @@ static void ac3_upmix_delay(AC3DecodeContext *s) * @param[in] start_subband subband number for start of range * @param[in] end_subband subband number for end of range * @param[in] default_band_struct default band structure table - * @param[out] band_struct decoded band structure * @param[out] num_bands number of bands (optionally NULL) * @param[out] band_sizes array containing the number of bins in each band (optionally NULL) */ static void decode_band_structure(GetBitContext *gbc, int blk, int eac3, int ecpl, int start_subband, int end_subband, const uint8_t *default_band_struct, - uint8_t *band_struct, int *num_bands, + int *num_bands, uint8_t *band_sizes) { int subbnd, bnd, n_subbands, n_bands=0; uint8_t bnd_sz[22]; + uint8_t coded_band_struct[22]; + const uint8_t *band_struct; n_subbands = end_subband - start_subband; /* decode band structure from bitstream or use default */ if (!eac3 || get_bits1(gbc)) { for (subbnd = 0; subbnd < n_subbands - 1; subbnd++) { - band_struct[subbnd] = get_bits1(gbc); + coded_band_struct[subbnd] = get_bits1(gbc); } + band_struct = coded_band_struct; } else if (!blk) { - memcpy(band_struct, - &default_band_struct[start_subband+1], - n_subbands-1); + band_struct = &default_band_struct[start_subband+1]; + } else { + /* no change in band structure */ + return; } - band_struct[n_subbands-1] = 0; /* calculate number of bands and band sizes based on band structure. note that the first 4 subbands in enhanced coupling span only 6 bins @@ -879,7 +881,7 @@ static int decode_audio_block(AC3DecodeContext *s, int blk) decode_band_structure(gbc, blk, s->eac3, 0, cpl_start_subband, cpl_end_subband, ff_eac3_default_cpl_band_struct, - s->cpl_band_struct, &s->num_cpl_bands, + &s->num_cpl_bands, s->cpl_band_sizes); } else { /* coupling not in use */ |