afbeb49456
Having a string callback is much more simpler than a variable args one for writers to deal with, especially when dealing with escaping. This patch also introduces a local fast_asprintf() function which is similar to av_asprintf() but avoids reallocating at each print (leading to a performance issue).
FFmpeg README ------------- 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.