This optimizes the code slightly (116 -> 80sec)
Testcase:
18668/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5710836719157248
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
libavcodec/alsdec.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index 4bc0e2bd84..babe30bdc7 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1819,16 +1819,17 @@ static int decode_frame(AVCodecContext *avctx, void
*data, int *got_frame_ptr,
{
\
int##bps##_t *dest = (int##bps##_t*)frame->data[0];
\
int channels = avctx->channels;
\
- int32_t **raw_samples = ctx->raw_samples;
\
+ int32_t *raw_samples = ctx->raw_samples[0];
\
+ int raw_step = channels > 1 ? ctx->raw_samples[1] - raw_samples : 1;
\
shift = bps - ctx->avctx->bits_per_raw_sample;
\
if (!ctx->cs_switch) {
\
for (sample = 0; sample < ctx->cur_frame_length; sample++)
\
for (c = 0; c < channels; c++)
\
- *dest++ = raw_samples[c][sample] * (1U << shift);
\
+ *dest++ = raw_samples[c*raw_step + sample] * (1U <<
shift); \
} else {
\
for (sample = 0; sample < ctx->cur_frame_length; sample++)
\
for (c = 0; c < channels; c++)
\
- *dest++ = raw_samples[sconf->chan_pos[c]][sample] * (1U <<
shift);\
+ *dest++ = raw_samples[sconf->chan_pos[c]*raw_step +
sample] * (1U << shift);\
}
\
}
--
2.23.0
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