Chiebot-Mirror/FFmpeg - FFmpeg - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
Rostislav Pehlivanov	3228ac730c	vc2enc_dwt: pad the temporary buffer by the slice size Since non-Haar wavelets need to look into pixels outside the frame, we need to pad the buffer. The old factor of two seemed to be a workaround that fact and only padded to the left and bottom. This correctly pads by the slice size and as such reduces memory usage and potential exploits. Reported by Liu Bingchang. Ideally, there should be no temporary buffer but the encoder is designed to deinterleave the coefficients into the classical wavelet structure with the lower frequency values in the top left corner. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>	7 years ago
Rostislav Pehlivanov	b6c207f535	vc2enc_dwt: use 32 bit coefficients by default The problem is that with particularly complex images and especially at high bit depths and 5-level transforms the coefficients would overflow, causing huge artifacts to appear. This was discovered thanks to the fate tests, which will have to be redone as this fixes a multitude of problems and increases PSNR. There is a slight performance drop associated with this change, making the encoder slower by 1.15 times, however this is necessary in order to avoid undefined behavior and overflows. It would be worth to template the transforms to keep the performance for 8 bit images as 32 bit coefficients are unnecessary for that case, but the primary use of the encoder is to encode video at 10 bits. Reviewed-by: Christophe Gisquet <christophe.gisquet@gmail.com> Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>	9 years ago
Rostislav Pehlivanov	d6e76dd132	vc2enc_dwt: remove outdated comment Support for Haar was added a month or so ago. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>	9 years ago
Rostislav Pehlivanov	2b811e4605	vc2enc: halve allocated table size, refactor and optimize quantization Since coefficients differ only in the last bit when writing to the bitstream it was possible to remove the sign from the tables, thus halving them. Also now all quantization is done in the unsigned domain as the sign is completely separate, which gets rid of the need to do quantization on 32 bit signed integers. Overall, this slightly speeds up the encoder depending on the machine. The commit still generates bit-identical files as before the commit. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>	9 years ago
James Almer	0abdf7030e	avcodec/vc2enc_dwt: add missing header Fixes make checkheaders Signed-off-by: James Almer <jamrial@gmail.com>	9 years ago
Rostislav Pehlivanov	5669aa2a8a	vc2enc: use project-standard inclusion guards This was first reported on the mailing list in an earlier revision of this encoder but was forgotten from the final commit. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>	9 years ago
Rostislav Pehlivanov	ec9e87c922	avcodec: add a native SMPTE VC-2 HQ encoder This commit adds a new encoder capable of creating BBC/SMPTE Dirac/VC-2 HQ profile files. Dirac is a wavelet based codec created by the BBC a little more than 10 years ago. Since then, wavelets have mostly gone out of style as they did not provide adequate encoding gains at lower bitrates. Dirac was a fully featured video codec equipped with perceptual masking, support for most popular pixel formats, interlacing, overlapped-block motion compensation, and other features. It found new life after being stripped of various features and standardized as the VC-2 codec by the SMPTE with an extra profile, the HQ profile that this encoder supports, added. The HQ profile was based off of the Low-Delay profile previously existing in Dirac. The profile forbids DC prediction and arithmetic coding to focus on high performance and low delay at higher bitrates. The standard bitrates for this profile vary but generally 1:4 compression is expected (~525 Mbps vs the 2200 Mbps for uncompressed 1080p50). The codec only supports I-frames, hence the high bitrates. The structure of this encoder is simple: do a DWT transform on the entire image, split it into multiple slices (specified by the user) and encode them in parallel. All of the slices are of the same size, making rate control and threading very trivial. Although only in C, this encoder is capable of 30 frames per second on an 4 core 8 threads Ivy Bridge. A lookup table is used to encode most of the coefficients. No code was used from the GSoC encoder from 2007 except for the 2 transform functions in diracenc_transforms.c. All other code was written from scratch. This encoder outperforms any other encoders in quality, usability and in features. Other existing implementations do not support 4 level transforms or 64x64 blocks (slices), which greatly increase compression. As previously said, the codec is meant for broadcasting, hence support for non-broadcasting image widths, heights, bit depths, aspect ratios, etc. are limited by the "level". Although this codec supports a few chroma subsamplings (420, 422, 444), signalling those is generally outside the specifications of the level used (3) and the reference decoder will outright refuse to read any image with such a flag signalled (it only supports 1920x1080 yuv422p10). However, most implementations will happily read files with alternate dimensions, framerates and formats signalled. Therefore, in order to encode files other than 1080p50 yuv422p10le, you need to provide an "-strict -2" argument to the command line. The FFmpeg decoder will happily read any files made with non-standard parameters, dimensions and subsamplings, and so will other implementations. IMO this should be "-strict -1", but I'll leave that up for discussion. There are still plenty of stuff to implement, for instance 5 more wavelet transforms are still in the specs and supported by the decoder. The encoder can be lossless, given a high enough bitrate. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>	9 years ago