diff options
| -rw-r--r-- | libavcodec/mpegaudiodec.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libavcodec/mpegaudiodec.c b/libavcodec/mpegaudiodec.c index 6c088626fc..d82432c775 100644 --- a/libavcodec/mpegaudiodec.c +++ b/libavcodec/mpegaudiodec.c @@ -40,6 +40,7 @@ #define BACKSTEP_SIZE 512 #define EXTRABYTES 24 +#define LAST_BUF_SIZE 2 * BACKSTEP_SIZE + EXTRABYTES /* layer 3 "granule" */ typedef struct GranuleDef { @@ -63,7 +64,7 @@ typedef struct GranuleDef { typedef struct MPADecodeContext { MPA_DECODE_HEADER - uint8_t last_buf[2 * BACKSTEP_SIZE + EXTRABYTES]; + uint8_t last_buf[LAST_BUF_SIZE]; int last_buf_size; /* next header (used in free format parsing) */ uint32_t free_format_next_header; @@ -1378,7 +1379,8 @@ static int mp_decode_layer3(MPADecodeContext *s) if (!s->adu_mode) { int skip; const uint8_t *ptr = s->gb.buffer + (get_bits_count(&s->gb)>>3); - int extrasize = av_clip(get_bits_left(&s->gb) >> 3, 0, EXTRABYTES); + int extrasize = av_clip(get_bits_left(&s->gb) >> 3, 0, + FFMAX(0, LAST_BUF_SIZE - s->last_buf_size)); assert((get_bits_count(&s->gb) & 7) == 0); /* now we get bits from the main_data_begin offset */ av_dlog(s->avctx, "seekback: %d\n", main_data_begin); |