[FFmpeg-devel] [PATCH] QCELP decoder
Sat Oct 18 03:20:40 CEST 2008
On Oct 17, 2008, at 4:30 PM, Michael Niedermayer wrote:
>>>> + for (i = 0; i < 160; i++)
>>>> + outbuffer[i] = av_clipf(outbuffer[i], -8192., 8191.75) /
>>> cant this scale factor be merged into some tables?
>> by merging it in qcelp_g12ga and testing on the samples
>> from samples.mplayerhq.hu and others:
>> I use 'ffmpeg --i sample_file sample_file.wav' to create the output
>> I use md5sum to check if the output had changed
>> and run 'tiny_psnr old_file new_file' if it had.
>> here are the results:
>> qtaudio-qcelp-problem.3g2: audio mismatchs from previous build
>> stddev: 11.93 PSNR: 26.59 bytes: 208044/ 208044
>> zg3dx2d6.3g2: audio mismatchs from previous build
>> stddev: 17.77 PSNR: 23.12 bytes: 486444/ 486444
>> vidoo_MP4_audio_Qcelp13k.k3g: audio mismatchs from previous build
>> stddev: 10.94 PSNR: 27.34 bytes: 743724/ 743724
>> does it look reasonable ? is at acceptable?
> i think not, question is, why do these differ?
> There really should be no difference just from scaling floats
fixed, i forgot to update the clipping values :(
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