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mpegaudiodec: Prevent premature clipping of mp3 input buffer. 

Instead of clipping extrasize based on EXTRABYTES, clip based on the
amount of buffer actually left. Without this fix, there are warbles
and other distortions in the test case below.

http://kevincennis.com/mix/assets/sounds/1901_voxfx.mp3
This commit is contained in:
Dale Curtis 2012-02-24 13:17:39 -05:00 committed by Justin Ruggles
parent 655b24c01c
commit b716542691
1 changed files with 4 additions and 2 deletions
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6
libavcodec/mpegaudiodec.c
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@ -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);