Hi, On Mon, Aug 3, 2015 at 7:27 AM, Romeyke, Andreas < andreas.rome...@slub-dresden.de> wrote:
> And secondly, could you explain the difference between the various > PCM-encodings? My assumpation was, that > * the unsigned variant are "linear PCM", because there are only positive > quantization levels > * the signed variant are "linear differential PCM" > * and the float variants are A/ยต - weighted PCM? > > Or I am totally wrong with this interpretation? Please, could you link me > to an explanation? Just different offsets and ranges. Unsigned, n bits (e.g. u8) is in the range [0,2^^n> (e.g. for u8, the range is [0,255] or [0,256>), where silence is 2^^n-1, e.g. 0x80 (128) for u8. Signed is in the range [-2^^n-1,2^^n-1> (e.g. s16, the most typical variant, is [-32768,32767]. Float is in the range [-1.0, 1.0]. In both cases, 0, is silence. We have various formats so we can represent exactly what's in a file or output by any one particular decoder without having to convert the internal representation into some intermediate format. Ronald _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
