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aacenc: copy PRNG from the decoder

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Needed for the following PNS commits.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
This commit is contained in:
Rostislav Pehlivanov 2015-09-06 15:06:34 +01:00
parent 34e85cb340
commit 92aa3e7fb2
3 changed files with 11 additions and 0 deletions
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1
libavcodec/aacenc.c
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@ -861,6 +861,7 @@ static av_cold int aac_encode_init(AVCodecContext *avctx)
ff_aac_coder_init_mips(s);
s->lambda = avctx->global_quality > 0 ? avctx->global_quality : 120;
s->random_state = 0x1f2e3d4c;
ff_aac_tableinit();

1
libavcodec/aacenc.h
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@ -98,6 +98,7 @@ typedef struct AACEncContext {
AACCoefficientsEncoder *coder;
int cur_channel;
int last_frame;
int random_state;
float lambda;
AudioFrameQueue afq;
DECLARE_ALIGNED(16, int, qcoefs)[96]; ///< quantized coefficients

9
libavcodec/aacenc_utils.h
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@ -128,6 +128,15 @@ static inline int quant_array_idx(const float val, const float *arr, const int n
return index;
}
/*
* linear congruential pseudorandom number generator, copied from the decoder
*/
static inline int lcg_random(unsigned previous_val)
{
union { unsigned u; int s; } v = { previous_val * 1664525u + 1013904223 };
return v.s;
}
#define ERROR_IF(cond, ...) \
if (cond) { \
av_log(avctx, AV_LOG_ERROR, __VA_ARGS__); \