diff options
| author | Justin Ruggles <justin.ruggles@gmail.com> | 2011-12-21 16:09:11 -0500 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2012-01-03 21:51:53 +0100 |
| commit | 9665ccda10c5292409c9edbab33eba790a4c8170 (patch) | |
| tree | 1e0d8304f92614e523121d6ef49ec09abab9d67a | |
| parent | 8dce2dd9cc06a28ff46a27aeeb2913cb5ae8fa19 (diff) | |
| download | ffmpeg-9665ccda10c5292409c9edbab33eba790a4c8170.tar.gz | |
ra144enc: zero the reflection coeffs if the filter is unstable
fixes use of uninitialized values if the filter is still unstable after using
the previous frame lpc coefficients.
(cherry picked from commit 9a3f10695a011861dcf5a649e3e72580b1a4eed4)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavcodec/ra144enc.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libavcodec/ra144enc.c b/libavcodec/ra144enc.c index 19fe06c840..2436bac147 100644 --- a/libavcodec/ra144enc.c +++ b/libavcodec/ra144enc.c @@ -477,7 +477,10 @@ static int ra144_encode_frame(AVCodecContext *avctx, uint8_t *frame, * The filter is unstable: use the coefficients of the previous frame. */ ff_int_to_int16(block_coefs[NBLOCKS - 1], ractx->lpc_coef[1]); - ff_eval_refl(lpc_refl, block_coefs[NBLOCKS - 1], avctx); + if (ff_eval_refl(lpc_refl, block_coefs[NBLOCKS - 1], avctx)) { + /* the filter is still unstable. set reflection coeffs to zero. */ + memset(lpc_refl, 0, sizeof(lpc_refl)); + } } init_put_bits(&pb, frame, buf_size); for (i = 0; i < LPC_ORDER; i++) { |