av_buffer_is_writable  154 libavutil/buffer.c     if (av_buffer_is_writable(buf))
av_buffer_is_writable  194 libavutil/buffer.c         !av_buffer_is_writable(buf)) {
av_buffer_is_writable  163 libavutil/buffer.h int av_buffer_is_writable(const AVBufferRef *buf);
av_buffer_is_writable  413 libavutil/frame.c             ret &= !!av_buffer_is_writable(frame->buf[i]);
av_buffer_is_writable  415 libavutil/frame.c         ret &= !!av_buffer_is_writable(frame->extended_buf[i]);