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-rwxr-xr-xformats/format_wav_gsm.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/formats/format_wav_gsm.c b/formats/format_wav_gsm.c
index fc8364cd1..7fdbb8604 100755
--- a/formats/format_wav_gsm.c
+++ b/formats/format_wav_gsm.c
@@ -209,7 +209,8 @@ static int update_header(int fd)
cur = lseek(fd, 0, SEEK_CUR);
end = lseek(fd, 0, SEEK_END);
- bytes = end - 52;
+ /* in a gsm WAV, data starts 60 bytes in */
+ bytes = end - 60;
datalen = htoll(bytes);
filelen = htoll(52 + ((bytes + 1) & ~0x1));
if (cur < 0) {