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authorDale Curtis <dalecurtis@chromium.org>2012-02-24 13:17:39 -0500
committerJustin Ruggles <justin.ruggles@gmail.com>2012-02-24 13:47:04 -0500
commitb7165426917f91ebcad84bdff366824f03b32bfe (patch)
treea8a98a66365b8d2c077e20dc19bfec21e2fcd9da /libavcodec
parent655b24c01cea2af7e56ac4ffe3d6fdc475223bcc (diff)
downloadffmpeg-b7165426917f91ebcad84bdff366824f03b32bfe.tar.gz
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
Diffstat (limited to 'libavcodec')
-rw-r--r--libavcodec/mpegaudiodec.c6
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);