FFmpeg

Commit Graph

Author	SHA1	Message	Date
Mans Rullgard	0d230e9312	g723.1: simplify scale_vector() It is impossible for bits to be 15 here so the special case is not needed. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	a4b8fc3a8a	g723.1: simplify normalize_bits() This function is always called with a non-negative argument, so those special cases are not needed. In the places the argument might be zero, the return value for a zero argument does not matter since it would then be used to scale an array full of zeros. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Michael Niedermayer	603221ebd0	g723_1dec: inline normalize_bits() in scale vector and optimize it. many branches and cases of scale_vector are irrelevant for the case here and by inlining they can be reliably removed. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Michael Niedermayer	20035fa241	g723_1dec: remove dead code that leaked in from libav It appears someone thinks this special case can be reached Well, it cannot, thus not only do we not need to optimize it we dont need it at all Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Michael Niedermayer	84d29df013	g723_1dec: remove unneeded cliping that leaked in from merge from libav Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Michael Niedermayer	a9040a1167	g723_1dec: avoid memcpy Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Mans Rullgard	69665bd6f4	g723.1: do not pass large structs by value Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	138914dcd8	g723.1: do not bounce intermediate values via memory Although a reasonable compiler will probably optimise out the actual store and load, this operation still implies a truncation to 16 bits which the compiler will probably not realise is not necessary here. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	cbcf1b411f	g723.1: declare a variable in the block it is used Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	35b533e4de	g723.1: avoid saving/restoring excitation Writing the scaled excitation to a scratch buffer (borrowing the 'audio' array) instead of modifying it in place avoids the need to save and restore the unscaled values. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	4b728b4712	g723.1: avoid unnecessary memcpy() in residual_interp() Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	f645710cf3	g723.1: make postfilter write directly to output buffer Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	1953264331	g723.1: drop unnecessary variable buf_ptr in formant_postfilter() Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	b2af2c4bee	g723.1: make scale_vector() output to a separate buffer Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	783da0d696	g723.1: make autocorr_max() work on an arbitrary buffer Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	3716105103	g723.1: do not needlessly use int64_t Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	47c73a73b0	g723.1: use saturating addition functions Use saturating addition functions instead of 64-bit intermediates and separate clipping. This is much faster when dedicated instructions are available. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	4aca716a53	g723.1: optimise scale_vector() Firstly, nothing in this function can overflow 32 bits so the use of a 64-bit type is completely unnecessary. Secondly, the scale is either a power of two or 0x7fff. Doing separate loops for these cases avoids using multiplications. Finally, since only the number of bits, not the actual value, of the maximum value is needed, the bitwise or of all the values serves the purpose while being faster. It is worth noting that even if overflow could happen, it was not handled correctly anyway. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	1eb1f6f281	g723.1: remove useless uses of MUL64() The operands in both cases are 16-bit so cannot overflow a 32-bit destination. In gain_scale() the inputs are reduced to 14-bit, so even the shift cannot overflow. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	5a43eba956	g723.1: remove unnecessary argument 'shift' from dot_product() The 'shift' argument is always 1 so there is no need to pass it explicitly in every call. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	8b0de73464	g723.1: deobfuscate "(x << 4) - x" to "15 * x" The compiler performs this optimisation. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	05c36e0e5f	g723.1: fix addition overflow This addition must be done as 64-bit to avoid overflow and for the subsequent clipping to be meaningful. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	52aa3015a3	g723.1: simplify and fix multiplication overflow In 16-bit arithmetic, x * 0xffffc is simply x * -4 with extra overflows, (and the constant was probably meant to be 0xfffc). Combined with the shift, this simplifies to -x >> 1. Finally, clearing the low two bits with a 32-bit mask and switching to a 32-bit type allows more efficient code on 32-bit machines. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	e141cf2c57	g723.1: deobfuscate an expression (x << 2) - x is just an optimisation of 3 * x the compiler is perfectly capable of doing on its own. Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Mans Rullgard	e2b7c5783d	g723.1: remove unused #includes Signed-off-by: Mans Rullgard <mans@mansr.com>	13 years ago
Kostya Shishkov	e78e6c37ef	g723_1: clip argument for 15-bit version of normalize_bits() It expects maximum value to be 32767 but calculations in scale_vector() which uses this function can give it ABS(-32768) which leads to wrong result and thus clipping is needed.	13 years ago
Kostya Shishkov	f86b2f3661	g723_1: use all LPC vectors in formant postfilter Due to some mistake LPC vector for the first subframe was used for all subframes instead of their own LPC vectors.	13 years ago
Anton Khirnov	36ef5369ee	Replace all CODEC_ID_* with AV_CODEC_ID_*	13 years ago
Michael Niedermayer	70bcdfb39f	g732_1: reduce difference to qatar Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Kostya Shishkov	d3e0766fc0	g723_1: scale output as supposed for the case with postfilter disabled	13 years ago
Kostya Shishkov	94bfdfd6f0	g723_1: increase excitation storage by 4 Fixed codebook mode in 5300 rate may write up to SUBFRAME_LEN + 4 and that is considered normal by the reference decoder. Without that additional padding it might overwrite first elements of LPC history.	13 years ago
Kostya Shishkov	802bcdcb2f	g723_1: fix upper bound parameter from inverse maximum autocorrelation	13 years ago
Kostya Shishkov	8ddadea171	g723_1: make scale_vector() behave like the reference	13 years ago
Kostya Shishkov	8772d2511a	g723_1: fix off-by-one error in normalize_bits()	13 years ago
Kostya Shishkov	7f92db14f9	g723_1: save/restore excitation with offset to store LPC history The same buffer with saved data is used later in LPC reconstruction, so it should have some head space for LPC history.	13 years ago
Michael Niedermayer	62514ca012	g723.1dec: Make postfilter user switchable Code from qatar (`55c3a4f617`) Author of the code was probably Mohamed or Kostya Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Michael Niedermayer	1eb1392690	g723.1: various cosmetics and changes that should have no user vissible effect. code from qatar (`55c3a4f617`) Author of the code was probably Mohamed or Kostya Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Mohamed Naufal Basheer	55c3a4f617	G.723.1 demuxer and decoder Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>	13 years ago
Paul B Mahol	60351ec13c	g723_1: add CODEC_CAP_DR1 Signed-off-by: Paul B Mahol <onemda@gmail.com>	13 years ago
Michael Niedermayer	1ebf6f941e	g723_1: change to encode2() Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Michael Niedermayer	a407baba85	g723_1: Fix "libavcodec/g723_1.c:988:8: warning: assignment from incompatible pointer type [enabled by default]" Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Paul B Mahol	69d766daa0	lavc: replace rest of deprecated SAMPLE_FMT_* with AV_SAMPLE_FMT_* Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Michael Niedermayer	eac5987c4f	g723_1dec: update to new API Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Michael Niedermayer	5174032953	g723.1: use memmove() where overlapping src and dst can happen. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Mohamed Naufal	ef64c45c94	g723.1 encoder Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Reimar Döffinger	812010c17e	Remove unused variable. Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>	13 years ago
Michael Niedermayer	04b4353f07	g723.1: very minor simplify of gen_acb_excitation() Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Michael Niedermayer	631eee6e90	g723.1: use MULL(a,b,15) for MULL2() idea by vitor Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Michael Niedermayer	cb58adaaa3	g723.1: simplify scale_vector() Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago
Michael Niedermayer	431f8af824	g723.1: replace loop of normalize_bits( by av_log2() idea by vitor Signed-off-by: Michael Niedermayer <michaelni@gmx.at>	13 years ago

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64 Commits (927022a75372b9e127c490c8cd87f027c3957dc3)